| 井上 卓見（いのうえ たくみ） | データ更新日：2024.04.17 |
教授 ／
工学研究院
機械工学部門
力学システム
| 1. | 井上卓見，門脇廉，宗和伸行, 接触剛性によるボルト締結モデルと透過超音波パルスを用いた定量評価, 日本機械学会論文集, DOI:10.1299/transjsme.22-00300, 89, 924, DOI:10.1299/transjsme.22-00300, 2023.08, [URL], Evaluation of bolt tightening plays an important role to keep a performance of a mechanical structure. Lack of the fastening force induces slack and falling of the tightening bolt. Excessive fastening force induces a plastic deformation of screw thread and causes the decline of the fastening force. Therefore, guarantee of the bolt tightening is an important subject in order to secure the mechanical structure against unforeseen accidents. However, most of preceding studies are restricted within qualitative evaluation of the slackness. In the field of industrial manufacturing, quantitative evaluation of the bolt tightening is strongly required. In this paper, the authors propose a technique for quantitative evaluation of bolt tightening, and in this technique, the flank of the screw thread is assumed to contact through a contact stiffness. The transmissivity and reflectivity of an ultrasonic pulse wave through the flank are derived as a function of contact stiffness, and the contact stiffness is capable of being identified from experimentally acquired amplitude of ultrasonic pulse wave. The contact stiffness is quantitatively identified and the surface pressure on the screw thread is estimated by the identified contact stiffness through the results of the preceding study. The proposed technique treats an ultrasonic pulse perpendicularly transmits a fastening bolt, and is applied to an experimentally acquired ultrasonic pulse which enters a side surface of nut and transmits a bolt-nut fastening element. The identified contact stiffness is shown to be adequate for the given fastening force to the bolt-nut fastening element, and validity of the proposed technique is demonstrated..  |
| 2. | 中島樹，井上卓見，髙橋 秀徳, 三次元離散ウェーブレット変換を用いた構成要素モード分解と固有モードにおける連成度評価への応用, 日本機械学会論文集, 10.1299/transjsme.22-00242, 88, 916, DOI:10.1299/transjsme.22-00242, 2022.12, [URL], Computer simulations using the combination of finite element method and modal analysis are now common methods for vibration prediction. However, when it comes to detailed models with large degrees-of-freedom, it is time consuming to evaluate and treat each characteristic mode one by one. Therefore, an efficient vibration analysis method is strongly desired. Macroscopically, characteristic modes of vehicle bodies, which mainly consist of frame structures and attached panels, are regarded as combinations of global and local deformations. Global deformation is attributable to frame structure which is defined as main component of the model, and local deformation is attributable to each panel component defined as sub component. As these deformations differ in priorities and countermeasures in design phase, it is essential to clarify the relation of global and local deformations, especially when they combine and compose coupled vibration. The purpose of this study is to present an analytical method to efficiently evaluate characteristic modes based on global and local deformations. In this paper, component mode decomposition is proposed to automatically decompose global and local deformation from characteristic modes of a frame-panel structure model. In this method, characteristic mode is first transformed into volume data and then three-dimensional wavelet transform is applied to separate global and local deformations. Then, from these separated deformations, component mode which consists of each single global and local deformation is derived using orthogonal transformation. By means of this orthogonal transformation, characteristic modes are effortlessly analyzed how much they contain each global and local deformation. In this paper, the proposed method is demonstrated on a simple frame-panel structure model.. |
| 3. | Itsuki Nakashima, Takumi Inoue, Ren Kadowaki, Yuki Abe, Development of Mode Separation Method for Frame-Panel Structures Using 3D Discrete Wavelet Transform, The 19th Asia Pacific Vibration Conference, 2022.11, Computer simulations using the combination of finite element method (FEM) and modal analysis are now useful methods for vibration prediction of machineries. Macroscopically, characteristic modes of vehicle bodies, which mainly consist of frame structures and attached panels, are regarded as combinations of global and local deformations. As these deformations differ in priorities and countermeasures in the design phase, it is essential to evaluate these deformations individually. However, when it comes to a large and complicated model, it is time consuming to analyze whole modes one by one. Therefore, an efficient analysis method to evaluate these deformations in characteristic modes is strongly desired in various industrial fields. The purpose of this study is to present an analytical method to automatically separate global and local deformations from a frame-panel structure model. The method focuses on the difference of spatial frequencies, as global deformation has lower spatial frequency than local deformation, which exists partially and thus has higher spatial frequency. Each deformation is separated from characteristic modes by means of multiresolution analysis using three dimensional discrete wavelet transform (3D-DWT). This method enables to evaluate each deformation individually and efficiently without taking a closer look at the model or considering its specification. In this study, a 3D finite element model is converted into voxel space in order to apply 3D-DWT. Then, mode separation method using 3D-DWT is demonstrated by a frame-panel structure model of automobile body.. |
| 4. | 門脇廉，井上卓見, モード変換を伴う透過超音波パルスを用いたボルトの緩み診断, 日本機械学会論文集, 10.1299/transjsme.21-00258, 88, 905, DOI:10.1299/transjsme.21-00258, 2022.01, [URL], Bolt loosening may lead to severe accidents in machine and infrastructure facilities. Hence, it is pertinent to detect bolt loosening early. This study proposes a new non-destructive testing method for bolt loosening using ultrasonic pulses projected onto a screw thread of the bolt. This method focuses on the pulse transmitted through the bolt. The mode conversion of the ultrasonic pulse occurs when the pulse reflects and transmits on the flanks of the screw thread. The amplitude of the mode-converted pulse is affected by the contact condition on the screw thread. The transmitted pulse consists of several pulses with different transmission paths. The proposed method calculates an instantaneous frequency of the superimposed transmitted pulse and detects the bolt loosening as a change in the instantaneous frequency, which is caused by the amplitude change of the mode-converted pulses. A simple experiment using an aluminum block and a stainless steel bolt tightened with several kinds of torque is demonstrated in this study. Upon decreasing the tightening torque, the maximal instantaneous frequency of the transmitted pulse drops and appears earlier. To verify the mechanism of the proposed method, identification of the transmission paths and a numerical simulation were implemented. It is elucidated that the two mode-converted pulses that were transmitted through the pressure flanks and were reflected on the clearance flanks primarily affect the instantaneous frequency of the transmitted pulse. Additionally, their amplitude decreases with the decrease in the contact ratio of the pressure flanks. The contact ratio correlates with the tightening torque. This analytical study shows that the maximal instantaneous frequency and the time of the maximal value vary owing to the tightening torque. Therefore, the proposed method provides a reasonable index for non-destructive testing for bolt loosening.. |
| 5. | Ren Kadowaki，Takumi Inoue, Diagnosis of bolt loosening using transmitted ultrasonic pulse with mode conversion, Transactions of the Japan Society of Mechanical Engineers, 10.1299/transjsme.21-00258, 88, 905, DOI:10.1299/transjsme.21-00258, 2022.01, [URL], Bolt loosening may lead to severe accidents in machine and infrastructure facilities. Hence, it is pertinent to detect bolt loosening early. This study proposes a new non-destructive testing method for bolt loosening using ultrasonic pulses projected onto a screw thread of the bolt. This method focuses on the pulse transmitted through the bolt. The mode conversion of the ultrasonic pulse occurs when the pulse reflects and transmits on the flanks of the screw thread. The amplitude of the mode-converted pulse is affected by the contact condition on the screw thread. The transmitted pulse consists of several pulses with different transmission paths. The proposed method calculates an instantaneous frequency of the superimposed transmitted pulse and detects the bolt loosening as a change in the instantaneous frequency, which is caused by the amplitude change of the mode-converted pulses. A simple experiment using an aluminum block and a stainless steel bolt tightened with several kinds of torque is demonstrated in this study. Upon decreasing the tightening torque, the maximal instantaneous frequency of the transmitted pulse drops and appears earlier. To verify the mechanism of the proposed method, identification of the transmission paths and a numerical simulation were implemented. It is elucidated that the two mode-converted pulses that were transmitted through the pressure flanks and were reflected on the clearance flanks primarily affect the instantaneous frequency of the transmitted pulse. Additionally, their amplitude decreases with the decrease in the contact ratio of the pressure flanks. The contact ratio correlates with the tightening torque. This analytical study shows that the maximal instantaneous frequency and the time of the maximal value vary owing to the tightening torque. Therefore, the proposed method provides a reasonable index for non-destructive testing for bolt loosening.. |
| 6. | Kenta Mori, Takumi Inoue, Ren Kadowaki, Non-contact detection of heat seal defect using the coincidence effect of airborne ultrasound, Transactions of the Japan Society of Mechanical Engineers, 10.1299/transjsme.19-00381, 86, 886, DOI: 10.1299/transjsme.19-00381, 2020.06, [URL], Heat sealing is a packaging technique by means of welding of seal materials with heating and compression, and is widely used for hermetic seal of foods and medical supplies. However, a defect of the heat sealing, for example a “pinhole”, caused by small wrinkle on the sealing film or jamming by contaminants occasionally arises. In order to enhance the reliability of heat seal products, this study proposes a nondestructive technique to detect such a small defect in the heat seal by utilizing coincidence effect of airborne ultrasound. In the proposed method, a bending wave with sufficient amplitude is excited by the coincidence effect, and this bending wave appears as a traveling wave on the heat seal. This traveling wave is sensitive to the defect in heat seal and shows apparent phase lags compared with defectless heat seal. Therefore, defect in the heat seal is detectable by observation of the phase lags in the traveling wave. Arrangement of ultrasound transmitter and receiver is important for the proposed technique in order to observe the phase lags efficiently. Traveling wave plays an important role to detect the defect in heat seal, so that the airborne ultrasound inspection without the coincidence effect is unavailable because the traveling wave is not generated. Validity of the proposed technique is demonstrated through experiments and numerical simulations.. |
| 7. | 森健太，井上卓見，門脇廉, 空中超音波のコインシデンス効果を利用するヒートシール瑕疵の非接触検出, 日本機械学会論文集, 10.1299/transjsme.19-00381, 86, 886, DOI: 10.1299/transjsme.19-00381, 2020.06, [URL], Heat sealing is a packaging technique by means of welding of seal materials with heating and compression, and is widely used for hermetic seal of foods and medical supplies. However, a defect of the heat sealing, for example a “pinhole”, caused by small wrinkle on the sealing film or jamming by contaminants occasionally arises. In order to enhance the reliability of heat seal products, this study proposes a nondestructive technique to detect such a small defect in the heat seal by utilizing coincidence effect of airborne ultrasound. In the proposed method, a bending wave with sufficient amplitude is excited by the coincidence effect, and this bending wave appears as a traveling wave on the heat seal. This traveling wave is sensitive to the defect in heat seal and shows apparent phase lags compared with defectless heat seal. Therefore, defect in the heat seal is detectable by observation of the phase lags in the traveling wave. Arrangement of ultrasound transmitter and receiver is important for the proposed technique in order to observe the phase lags efficiently. Traveling wave plays an important role to detect the defect in heat seal, so that the airborne ultrasound inspection without the coincidence effect is unavailable because the traveling wave is not generated. Validity of the proposed technique is demonstrated through experiments and numerical simulations.. |
| 8. | Ren Kadowaki, Takumi Inoue, Kentaro Kameda, Kazuhisa Ohmura, A New Testing Method for Bolt Loosening with Transmitted Ultrasonic Pulse, Asia Pacific Vibration Conference 2019, 2019.11. |
| 9. | Itsuki Nakashima, Takumi Inoue, Ren Kadowaki, Classification of Characteristic Modes for Vibration Reduction, Asia Pacific Vibration Conference 2019, 2019.11. |
| 10. | Ren Kadowaki, Shoki Ikeda, Takumi Inoue, Diagnosis of bolt loosening using reflected ultrasonic pulse, Transactions of the Japan Society of Mechanical Engineers, 10.1299/transjsme.18-00202, 85, 871, DOI: 10.1299/transjsme.18-00202, 2019.02, [URL], Diagnosis of the bolt loosening is important in the industrial field and the medical field such as dental implants. This study proposes a new non-destructive testing method for the bolt loosening using ultrasonic pulse projected to the side of the bolt. This method focuses on the reflected pulse from the screw thread and its instantaneous frequency. A basic experiment with aluminum block and a stainless steel bolt shows that the tightening torque of the bolt can be evaluated via the instantaneous frequency of the reflected pulse from the screw thread. Decreasing the tightening torque, the instantaneous frequency reaches a maximal value earlier. We tried to verify the mechanism of the proposed method through an identification of the transmission paths and a numerical simulation. Real contact area on the load flank decreases, and the reflectance on the load flank changes when the tightening torque decreases. The analytical study shows that the change of the eflectance affects the received pulse. Especially, a peak time of the instantaneous frequency of the received pulse varies owing to the amplitude ratio of the reflected pulses from the load flank to the pulses reflected from the other contact surfaces. These analytical results follow the experimental results. Therefore, observing the peak time of the instantaneous frequency of the received ultrasonic pulse, we can obtain the reasonable index to diagnose the bolt loosening.. |
| 11. | 門脇廉，池田翔輝，井上卓見, 反射超音波パルスを用いたボルトの緩み診断, 日本機械学会論文集, 10.1299/transjsme.18-00202, 85, 871, DOI: 10.1299/transjsme.18-00202, 2019.02, [URL], Diagnosis of the bolt loosening is important in the industrial field and the medical field such as dental implants. This study proposes a new non-destructive testing method for the bolt loosening using ultrasonic pulse projected to the side of the bolt. This method focuses on the reflected pulse from the screw thread and its instantaneous frequency. A basic experiment with aluminum block and a stainless steel bolt shows that the tightening torque of the bolt can be evaluated via the instantaneous frequency of the reflected pulse from the screw thread. Decreasing the tightening torque, the instantaneous frequency reaches a maximal value earlier. We tried to verify the mechanism of the proposed method through an identification of the transmission paths and a numerical simulation. Real contact area on the load flank decreases, and the reflectance on the load flank changes when the tightening torque decreases. The analytical study shows that the change of the eflectance affects the received pulse. Especially, a peak time of the instantaneous frequency of the received pulse varies owing to the amplitude ratio of the reflected pulses from the load flank to the pulses reflected from the other contact surfaces. These analytical results follow the experimental results. Therefore, observing the peak time of the instantaneous frequency of the received ultrasonic pulse, we can obtain the reasonable index to diagnose the bolt loosening.. |
| 12. | Kenta Mori, Takumi Inoue, Ren Kadowaki, Kazuhisa Omura, Detecting small delamination in flexible packages using coincidence effect of air-coupled ultrasound, APVC2017: the 17th Asian Pacific Vibration Conference, APVC2017 #122, 2017.11. |
| 13. | Ren Kadowaki, Naoki Otsubo, Takumi Inoue, Kazuhisa Omura, Liquid Viscosity Evaluation using Ultrasonic Pulse, APVC2017: the 17th Asian Pacific Vibration Conference, APVC2017 #125, 2017.11. |
| 14. | 井上 卓見, 門脇 廉, 森 健太, 超音波パルスの瞬時振動数を用いたヒートシールの非破壊接着力評価, 日本機械学会, DOI:10.1299/transjsme.16-00327, 82, 843, 2016.11. |
| 15. | Takumi Inoue, Ren Kadowaki, Kenta Mori, Nondestructive evaluation of seal strength of heat sealing using instantaneous frequency of ultrasonic pulse, Transactions of the Japan Society of Mechanical Engineers, 10.1299/transjsme.16-00327, 82, 843, DOI:10.1299/transjsme.16-00327, 2016.11, [URL], Heat sealing is a packaging technique for hermetic sealing of foods and medical supplies etc. Evaluation of seal strength is important to guarantee both airtightness and easiness to open which are conflicting requirements. There are few studies of nondestructive evaluation although conventional spot check with destructive evaluation costs a great deal. This study proposes a new nondestructive evaluation method for the seal strength with ultrasonic pulse. The proposed method focuses on instantaneous frequency of the ultrasonic pulse which is time varying frequency in waveform. This paper demonstrates that the instantaneous frequency is more effective to evaluate the seal strength than conventional indexes such as amplitude and arrival time of the pulse through experiments. The transmittance and reflectance on the welded boundary surface are supposed to vary depending on the seal strength because the welded condition does not affect only the seal strength but the characteristics on the welded boundary surface. We also analytically discuss the mechanism how the instantaneous frequency senses the change of the transmittance and reflectance on the welded boundary surface. Simulated instantaneous frequencies also vary according to the change of the transmittance and reflectance. This result indicates that our proposed method effectively senses the variation of the welded surface characteristics pertaining to heat strength.. |
| 16. | 井上 卓見, 中野貴裕, 門脇 廉, 超音波パルスの瞬時振動数を用いた物体内部の接触境界面評価 , 日本機械学会 , DOI:10.1299/transjsme.15-00420, 81, 832, 2015.12. |
| 17. | Takumi Inoue, Takahiro Nakano, Ren Kadowaki, Evaluation of internal boundary surface using instantaneous frequency of ultrasonic pulse, Transactions of the Japan Society of Mechanical Engineers, 10.1299/transjsme.15-00420, 81, 832, DOI:10.1299/transjsme.15-00420, 2015.12, [URL], An evaluation technique of internal boundary surface using instantaneous frequency of ultrasonic pulse is proposed. The instantaneous frequency represents a variation of the frequency of the ultrasonic pulse waveform from moment to moment. In this paper, a novel technique to acquire precisely the instantaneous frequency of ultrasonic pulse is proposed. Results of fundamental experiments, in which several internal boundary conditions are simulated by rubber elements, show that the instantaneous frequency of ultrasonic pulse transmitted the internal boundary is sensitive to the change of the boundary condition. Profiles of instantaneous frequency significantly change according to surface roughness and contact pressure of boundary, so that the internal boundary conditions can be evaluated by the instantaneous frequency. It is demonstrated that internal boundary conditions can be modeled as linearly or non-linearly change of partial stiffness, and the profiles of the instantaneous frequency depend on the partial stiffness. In addition, it is shown that the proposed method is not only available to rubber element but also metallic component.. |
| 18. | Takuya Kishida, Kazumasa Ohama, Takumi Inoue, Ren Kadowaki, Kazuhisa Omura, Transverse Motion of the Plate Spring that Automatically Follows the Excitation Frequency , APVC2015, 16th Asia Pacific Vibration Conference, 2015.11. |
| 19. | Ren Kadowaki, Takumi Inoue, Tatsuya Oda, Takahiro Nakano, New Evaluation Technique of Seal Strength of Heat Sealing with Ultrasonic Pulse , APVC2015, 16th Asia Pacific Vibration Conference, 2015.11. |
| 20. | Kensaku Kawazu, Takashi Nakae, Takahiro Ryu, Kenichiro Matsuzaki, Etsunori Fujita, Hiroki Ohshimo, Takumi Inoue, Fundamental Study on Optimal Design of Vibration Isolating Bed Using Magnetic Spring for Ambulance , APVC2013, 15th Asia Pacific Vibration Conference, 2013.06. |
| 21. | Takumi Inoue, Takuya Kishida, Yuuki Tokuura, Daisuke Maeda, Kazuhisa Omura, Takahiro Ryu, Experimental Study on a Vibration System Automatically Following to Excitation Frequency , APVC2013, 15th Asia Pacific Vibration Conference, 2013.06. |
| 22. | Daiki Yanagihara, Takumi Inoue, Takahiro Nakano, Tatsuya Oda, Kazuhisa Omura, Estimation of Seal Strength on Heat Sealing by Ultrasound, APVC2013, 15th Asia Pacific Vibration Conference, 2013.06. |
| 23. | Takumi Inoue, Toshiro Emura, Takahiro Nakano, Damage monitoring of ceramic grinding tool using amplitude modulation of vibration, Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C, 10.1299/kikaic.79.970, 79, 800, 970-981, 2013.05, [URL], One of the problems in ceramic grinding is damage to tool after a long time operation. It gives a crucial damage to work piece so that the grinding tool has to be replaced by new tool before the crucial damage. Acoustic emission is often used in the monitoring. It gives satisfactory results in certain case, while some results are ineffective because the acoustic emission is sensitive to noise. In the present study, we use the vibration acceleration of the ceramic work piece during the grinding process. The acceleration can be easily acquired and show stable characteristics irrespective of measurement location. We investigate a feasibility of damage monitoring of ceramic grinding tool using the vibration acceleration, and focus on the amplitude modulation of the obtained acceleration. A direct frequency analysis to the obtained acceleration is ineffective for the monitoring because it only shows broadband random frequency components. On one hand, the frequency analysis of the amplitude modulation shows significant results. The rotational frequency of the tool and its multiples are clearly observed in the frequency components of the amplitude modulation, and the tool condition can be monitored by tracking the transition of the rotational and its multiples frequency components.. |
| 24. | 井上 卓見, 江村敏郎, 中野貴裕, 振動加速度の振幅変調を用いたセラミック加工工具の損傷モニタリング, 日本機械学会 , 79, 800, 970-981, 2013.04. |
| 25. | Takahiro Nakano, Takumi Inoue, Estimation of Inner State Using Instantaneous Frequency of Ultrasonic Wave, Theoretical and Applied Mechanics Japan, 60, 135-142, 2012.02. |
| 26. | Takahiro Nakano, Takumi Inoue, Estimation of inner state using instantaneous frequency of ultrasonic wave, Theoretical and Applied Mechanics Japan, 60, 135-142, 2012, Pulse-echo method is a conventional ultrasonic inspection. This method detects a crack as the reflection of ultrasonic pulse at the crack. However, this method is ineffective to detect a closed crack which shows an indistinct reflection. In this study, the authors propose use of instantaneous frequency of the ultrasonic pulse in order to detect the closed crack. The instantaneous frequency can distinguish the slight difference in a frequency of the ultrasonic pulse passing through the crack because the instantaneous frequency expresses the frequency variation in detail. It is difficult for the usual Fourier transform to catch a small change in ultrasonic frequency because of wide spread property and indistinct peak. Feasibility of the proposed method is demonstrated through simple experiments.. |
| 27. | Takahiro Nakano, Takumi Inoue, Evaluating Adhesive Strength of Epoxy Resin Using Instantaneous Frequency of Ultrasonic Pulse, APVC2011, 14th Asia Pacific Vibration Conference, 2011.12. |
| 28. | 井上卓見，中野貴裕, 超音波パルスの瞬時振動数を用いた新たな診断法 (エポキシ樹脂系接着剤の接合度評価), 日本機械学会論文集（Ｃ編）, 77, 780, 2993-3006, 2011.08. |
| 29. | Takashi Nakae, Takahiro Ryu, Atsuo Sueoka, Yutaka Nakano, Takumi Inoue, Squeal and chatter phenomena generated in a mountain bike disc brake, Journal of Sound and Vibration, 330, 10, PP. 2138-2149, 2011.05. |
| 30. | Takashi Nakae, Takahiro Ryu, Atsuo Sueoka, Yutaka Nakano, Takumi Inoue, Squeal and chatter phenomena generated in a mountain bike disc brake, Journal of Sound and Vibration, 10.1016/j.jsv.2010.08.027, 330, 10, 2138-2149, 2011.05, [URL], This paper examines squeal and chatter phenomena generated experimentally in mountain bike disc brakes. There are two kinds of frictional self-excited vibrations in the bike disc brakes, called squeal with frequency of 1 kHz and chatter with frequency of 500 Hz. In order to reproduce the squeal and chatter, a bench test apparatus using an actual bike was set up to determine the associated frequency characteristics experimentally. The results show the frequencies to be independent of pad temperature and disc rotating speed. Squeal is shown to be in-plane vibration in the direction of the disc surface which is caused by the frictional characteristics having negative slope with respect to the relative velocity in the vibrating system, which includes brake unit, spokes and hub. Chatter is generated within a limited high temperature region. Again, it is frictional vibration in which the squeal and out-of-plane vibration of the disc due to Coulomb friction combine through the internal resonance relation between in-plane and out-of-plane nonlinear vibration caused by the temperature increase of the disc during braking.. |
| 31. | Takumi Inoue, Atsuo Sueoka, Vibration Analysis of a Moving Probe with Long Cable for Defect Detection of Helical Tubes, Advances in Vibration Analysis Research, PP. 367-390. , 2011.04. |
| 32. | Takumi Inoue, Takahiro Nakano, New diagnostic method using instantaneous frequency of ultrasonic pulse (evaluation of adhesive strength of epoxy resin), Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C, 77, 780, 2993-3006, 2011, Ultrasonic technique is an indispensable diagnostics to evaluate internal conditions. The conventional ultrasonic technique using a wave property, such as a reflected wave, wave speed, attenuation of amplitude and frequency spectrum is, however, not effective in some cases. In this study, we propose to use an instantaneous frequency of the ultrasonic pulse. The instantaneous frequency expresses a transition of the frequency of the ultrasonic pulse, so that it is sensitive to a slight variation of the ultrasonic frequency. The effectiveness is demonstrated through an experiment on adhesive strength of epoxy adhesive, which is controlled by curing process. The conventional ultrasonic technique is difficult for an evaluation of this adhesive strength. On one hand, the instantaneous frequency of an ultrasonic pulse, which passes through the adhesive layer, certainly distinguishes the difference of the adhesive strength. It is also shown that the adhesive characteristics pertaining to their strength are modeled as damping coefficients, which is demonstrated through a simple simulation of one-dimensional ultrasonic wave propagation.. |
| 33. | T. Nakano, Takumi Inoue, T. Sugiyama, S. Yamanaka, Detection of inner abnormality by the frequency modulation of ultrasonic wave, 23rd International Congress on Condition Monitoring and Diagnostic Engineering Management, COMADEM 2010 COMADEM 2010 - Advances in Maintenance and Condition Diagnosis Technologies Towards Sustainable Society, Proc. 23rd Int. Congr. Condition Monitoring and Diagnostic Engineering Management, 281-287, 2010.09, The conventional ultrasonic inspection is a detection of the ultrasonic wave reflected at the abnormal points in an inspected object. However, the ultrasound passes through an indistinct or minute abnormality. The conventional ultrasonic inspection is unavailable to detect them. In this paper, the authors focus their attention to frequency modulation of the ultrasonic wave, and attempt to detect the minute abnormality by using it. In the proposed method, the frequency modulation is observed as a variation of instantaneous frequency of the ultrasonic wave, and the instantaneous frequency is defined as the derivative of a time-dependent phase angle of the ultrasonic wave. In the case that the indistinct or minute abnormality exists in an object, the authors find that the instantaneous frequency of the ultrasound passing through the abnormality deviates from usual frequency level. Therefore, the abnormality can be detected by the variation of the instantaneous frequency, that is, the frequency modulation. It is difficult for the usual Fourier transform to catch the modulation because of a limitation of a frequency resolution. A feasibility of the proposed method is demonstrated through a simple experiment.. |
| 34. | Takahiro Nakano, Takumi Inoue, Takushi Sugiyama and Syunpei Yamanaka, Detection of Inner Abnormality by the Frequency Modulation of Ultrasonic Wave, COMADEM2010, 23rd International Congress on Condition Monitoring and Diagnostic Engineering Managemenmt, 2010.06. |
| 35. | Takumi Inoue, Toshiro Emura, Kantaro Shimizu, Syohei Kunitomi, Prediction of Tool Failure in Ceramic Grinding, COMADEM2010, 23rd International Congress on Condition Monitoring and Diagnostic Engineering Managemenmt, 2010.06. |
| 36. | Takumi Inoue, Toshiro Emura, Kantaro Shimizu, Syohei Kunitomi, Prediction of tool failure in ceramic grinding, 23rd International Congress on Condition Monitoring and Diagnostic Engineering Management, COMADEM 2010 COMADEM 2010 - Advances in Maintenance and Condition Diagnosis Technologies Towards Sustainable Society, Proc. 23rd Int. Congr. Condition Monitoring and Diagnostic Engineering Management, 521-528, 2010, In this research, we measure the acceleration of the work piece during the grinding process, and try to predict the tool failure. We give attention to amplitude modulation of the measured acceleration, and the Hilbert transform is employed in order to draw the amplitude modulation, The Fourier transform of the amplitude modulation yields significantly good results. The rotational frequency and its multiples are successfully observed through the proposed method. The tool failure is roughly predicted by tracking the transition of the frequency elements.. |
| 37. | Takahiro Ryu, Atsuo Sueoka, Kenichiro Matsuzaki, Hidetoshi Morita, Y.Mori, Takumi Inoue, Countermeasure against Pattern Formation Phenomena of Roll-Covering Rubber, APVC2009, 13th Asia Pacific Vibration Conference, 2009.11. |
| 38. | Takahiro Nakano, Takumi Inoue, Estimation of Inner Condition by the Frequency Modulation in Ultrasonic Wave, APVC2009, 13th Asia Pacific Vibration Conference, 2009.11. |
| 39. | Takumi Inoue, Takahiro Nakano, Takahiro Ryu, Forecast of Tool Failure in Grinding Process of Ceramic, APVC2009, 13th Asia Pacific Vibration Conference, 2009.11. |
| 40. | Takashi Nakae, Atsuo Sueoka, Takahiro Ryu, Takumi Inoue, Analysis of Squeal Phenomena Generated in a Bicycle Disc Brake, APVC2009, 13th Asia Pacific Vibration Conference, 2009.11. |
| 41. | Takumi Inoue, Takahiro Nakano, Atsuo Sueoka, Identification of Nonlinear Vibration Parameters by the Segmental Harmonic Wavelet, Proc. of the 2009 International Symposium of Advanced Engineering, PP.46-49, 2009.03. |
| 42. | Takahiro Nakano, Takumi Inoue, Atsuo Sueoka, The Estimation of Nonlinear Vibration Parameters through the Segmental Use of the Harmonic Wavelet, Theoretical and Applied Mechanics Japan, vol.57, PP.263-268, 2009.02. |
| 43. | Takahiro Nakano, Takumi Inoue, Atsuo Sueoka, The estimation of nonlinear vibration parameters through the segmental use of the harmonic wavelet, Theoretical and Applied Mechanics Japan, 57, 263-268, 2009, In order to perform an accurate evaluation of the dynamic response of a vibration system, it is important to estimate not only the linear vibration parameters but also the nonlinear parameters. Nonlinearities are estimated through time-varying vibration parameters, such as instantaneous damping ratio and instantaneous frequency. In the case of a relatively small nonlinearity, this technique is effective. In this paper, a segmental use of the harmonic wavelet is proposed in order to estimate time-varying parameters. The Hilbert transform is usually employed for the purpose of such estimations. However, it has been pointed out that the Hilbert transform yields unacceptable results with numerical instability under certain conditions. The proposed method shows significantly good results with respect to numerical stability as compared with the simple application of the Hilbert transform and a similar use of another wavelet.. |
| 44. | Takumi Inoue, Atsuo Sueoka, Takeshi Maehara, Yutaka Nakano, Hiroyuki Kanemoto, Vibrations of probe used for the defect detection of helical heating tubes in a fast breeder reactor Part 3. The mechanism of the vibration and the countermeasures, Nuclear Engineering and Design, 238-6, PP.1459-1470, 2008.06. |
| 45. | Takumi Inoue, Atsuo Sueoka, Takeshi Maehara, Yutaka Nakano, Hiroyuki Kanemoto, Vibrations of probe used for the defect detection of helical heating tubes in a fast breeder reactor. Part 3. The mechanism of the vibration and the countermeasures, Nuclear Engineering and Design, 10.1016/j.nucengdes.2007.11.002, 238, 6, 1459-1470, 2008.06, [URL], An eddy current testing (ECT) probe is used for the diagnosis of helical heating tubes installed in the Japanese fast breeder reactor "Monju". Vibrations of the ECT probe occur and make the diagnosis difficult. In our previous study, several characteristics of the vibrations were elucidated through some experiments, and we took some empirical countermeasures against the vibrations. Further, we showed that the vibrations were caused by Coulomb friction through some numerical simulations. In this paper, firstly, the return process of the ECT probe out of the heating tube is considered since only the insertion process of the ECT probe was considered in our previous study. Following this, the efficacy of the proposed vibration countermeasures is evaluated by way of numerical simulation. The mechanism of the vibration and the countermeasures are discussed on the basis of the entire behavior of the probe, which was obtained by a numerical simulation. Lastly, an improvement in the countermeasure is proposed. The validity of the improvement is demonstrated through a numerical simulation both in the insertion and the return processes.. |
| 46. | 井上卓見，末岡淳男，岡沢伸吾, ハーモニックウェーブレットの区分利用による時変振動パラメータ推定, 日本機械学会論文集（Ｃ編）, 74, 741, PP.1145-1153, 2008.05. |
| 47. | Takumi Inoue, Atsuo Sueoka, Shingo Okazawa, Estimation of time-varying vibration parameters by the segmental use of the harmonic wavelet, Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C, 74, 5, 1145-1153, 2008.05, Estimation of time-varying vibration parameters, that is, instantaneous damping and frequencies by the wavelet transform is based on the ridge identification and the phase extraction in the time-frequency map. However, there are some problems in easiness to operate the technique. The process of the ridge identification is rather complicated, and the most suitable mother wavelet to yield a time-frequency map for the efficient identification is not determinately chosen. In this paper, we propose a segmental use of the harmonic wavelet in order to estimate the time-varying vibration parameters. The segmental harmonic wavelet is implemented in combination with the Fourier transform, which is utilized to set bounds to frequency range. It shows significantly good results compared with the simple application of the Hubert transform. The time-varying parameters pertaining to nonlinearities are successfully estimated by the proposed method. A possibility of the proposed method to a diagnosis of a mechanical element is also demonstrated.. |
| 48. | Takumi Inoue, Atsuo Sueoka, Detection of a Small Fault in a Rotating Gear by the Harmonic Wavelet Transform, Journal of System Design and Dynamics, 2-1, PP.197-208. , 2008.04. |
| 49. | Takahiro Ryu, Kenichiro Matsuzaki, Atsuo Sueoka, Hidetoshi Morita, Takumi Inoue, Countermeasures against Pattern Formation Phenomena of Thin Sheet Winder by Using Dynamic Absorbers , APVC2007, 12th Asia Pacific Vibration Conference, P.90 (Paper No.49), 2007.08. |
| 50. | Takumi Inoue, Hiroyuki Kanemoto, Atsuo Sueoka, Takahiro Ryu, Detection of a Small Fault in a Periodic Monitored Signal by the Harmonic Wavelet Transform, APVC2007, 12th Asia Pacific Vibration Conference, P.162 (Paper No.78), 2007.08. |
| 51. | Takumi Inoue, Atsuo Sueoka, Hiroyuki Kanemoto, Satoru Odahara, Yukitaka Murakami, Detection of minute signs of a small fault in a periodic or a quasi-periodic signal by the harmonic wavelet transform, Mechanical Systems and Signal Processing, 21-5, PP.2041-2045, 2007.07. |
| 52. | Takumi Inoue, Atsuo Sueoka, Hiroyuki Kanemoto, Satoru Odahara, Yukitaka Murakami, Detection of minute signs of a small fault in a periodic or a quasi-periodic signal by the harmonic wavelet transform, Mechanical Systems and Signal Processing, 10.1016/j.ymssp.2006.09.002, 21, 5, 2041-2055, 2007.07, [URL], If a machine in operation has a fault, signs of the fault appear in the monitored signal and are usually synchronised with the operating speed. The signs are very small when the fault is at an early stage. The fast Fourier transform (FFT) is often utilised to detect these signs, but it is very difficult to detect minute signs. In this paper, harmonic wavelet transform is utilised to detect the minute signs of small faults in a monitored signal. The monitored signal of a machine element, in ordinary operation, is regarded as periodic or quasi-periodic. It is important for the effectual detection of the minute signs to reduce the obstructive noise and the end effects in the signal. The end effect is a peculiar phenomenon to wavelet transform and hampers effective detection. Useful methods to reduce the obstructive noise and the end effects are devised herein by the authors. Even if no visible information pertaining to a fault appears in the monitored waveform, the present method is able to detect a minute sign of a small fault. It is demonstrated that the present method is capable of detecting minute signs arising from slight collisions caused by a loose coupling and a fatigue crack.. |
| 53. | Takumi Inoue, Atsuo Sueoka, Free Vibration Analysis of a Structure with Closed Loops by the Transfer Influence Coefficient Method, Journal of System Design and Dynamics, 1-2, PP.374-385. , 2007.06. |
| 54. | Takumi Inoue, Atsuo Sueoka, Free Vibration Analysis of In-plane Frame Structures by the Transfer Influence Coefficient Method, Memoirs of the Faculty of Engineering, Kyushu University, 67-2, PP.33-51, 2007.06. |
| 55. | Takumi Inoue, Atsuo Sueoka, Free vibration analysis of in-plane frame structures by the transfer influence coefficient method, Memoirs of the Faculty of Engineering, Kyushu University, 67, 2, 33-51, 2007.06, The Transfer Influence Coefficient Method is an advantageous device used to analyze a dynamic response of a multi degree of freedom system. The Transfer Influence Coefficient Method conquered some disadvantages of the Transfer Matrix Method and has some advantages in computational accuracy and speed. However, this method was not available to treat truss and rahmen structures since the algorithm was incapable of branches and links to form a closed loop in truss and rahmen structures. In this paper, a new algorithm of the Transfer Influence Coefficient Method for an in-plane free vibration analysis of frame structures with closed loops is presented. The new algorithm still retains the advantages of the original algorithm on the computational accuracy and speed. The advantages are demonstrated through a free vibration analysis, compared with a conventional routine.. |
| 56. | Takumi Inoue, Atsuo Sueoka, Yutaka Nakano, Hiroyuki Kanemoto, Yoshiyuki Imai, Toshihiko Yamaguchi, Vibrations of probe used for the defect detection of helical heating tubes in a fast breeder reactor Part 1. Experimental results by using mock-up, Nuclear Engineering and Design, 237-8, PP.858-867, 2007.04. |
| 57. | Takumi Inoue, Atsuo Sueoka, Takeshi Maehara, Yutaka Nakano, Hiroyuki Kanemoto, Vibrations of probe used for the defect detection of helical heating tubes in a fast breeder reactor Part 2. Vibration analysis and numerical simulations, Nuclear Engineering and Design, 237-8, PP.868-879, 2007.04. |
| 58. | Takumi Inoue, Atsuo Sueoka, Yutaka Nakano, Hiroyuki Kanemoto, Yoshiyuki Imai, Toshihiko Yamaguchi, Vibrations of probe used for the defect detection of helical heating tubes in a fast breeder reactor. Part 1. Experimental results by using mock-up, Nuclear Engineering and Design, 10.1016/j.nucengdes.2006.11.001, 237, 8, 858-867, 2007.04, [URL], This paper deals with the vibration and the sensor signal noise of the eddy current testing (ECT) probe used for a defect detection of helical heating tubes in the fast breeder reactor "Monju", developed in Japan. ECT probes are used for the detection of defects in a heating tube. The heating tube is composed of a helical tube and a straight tube because of their advantages of thermal efficiency and saving space. No vibrations of the ECT probe have been generated in usual straight heating tubes. However, vibrations of the ECT probe in the helical tube cause some noise and decrease the sensitivity of the ECT probe. The experiment was performed using a mock-up, and the noise characteristics of an ECT sensor mounted in an ECT probe were examined. The experimental results showed that the sensor signal noise during the insertion process of the ECT probe was higher than that of the return process, and vibrations of the insertion process had a certain emerging frequency. Attaching the long and flexible guide probe to the top of the ECT probe was an effective countermeasure against sensor signal noise.. |
| 59. | Takumi Inoue, Atsuo Sueoka, Takeshi Maehara, Yutaka Nakano, Hiroyuki Kanemoto, Vibrations of probe used for the defect detection of helical heating tubes in a fast breeder reactor. Part 2. Vibration analysis and numerical simulations, Nuclear Engineering and Design, 10.1016/j.nucengdes.2006.11.003, 237, 8, 868-879, 2007.04, [URL], A detection of a defect of a helical heating tube installed in the fast breeder reactor "Monju" in Japan is done by a feeding of an eddy current testing (ECT) probe with magnetic sensor into the tube. An undesirable vibration of the ECT probe always happens under a certain condition and makes the inspection difficult. Several characteristics of the vibration have been made clear by some experiments using a mock-up, but the essential factor of the vibration is still unclear. In this paper, a numerical simulation of the vibration is implemented on the assumption that the vibration is caused by Coulomb friction. An analytical model, which is obtained as a lumped mass model, is a large-scale non-linear vibration system and many computational costs are ordinarily required to carry out the simulations. The Transfer Influence Coefficient Method is applied so that the simulation is efficiently carried out. The results of simulation qualitatively agree well with the experimental results. It confirms the validity of the assumption that the vibration is caused by Coulomb friction.. |
| 60. | 井上卓見，前原猛，末岡淳男，中野寛，金元啓幸，村上敬宜, 高速増殖炉ヘリカル伝熱管探傷プローブの振動によるセンサノイズとその対策（第3報，数値シミュレーションによるパラメータスタディ）, 日本機械学会論文集（Ｃ編）, 72, 722, PP.3185-3192, 2006.10. |
| 61. | Takumi Inoue, Takeshi Maehara, Atsuo Sueoka, Yataka Nakano, Hiroyuki Kanemoto, Yukitaka Murakami, Sensor noise caused by vibrations of flaw detection probe generated in helical heating tubes in a fast breeder reactor and its countermeasures (3rd report, parameter study by numerical simulations), Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C, 72, 10, 3185-3192, 2006.10, An eddy current testing (ECT) probe is used for a diagnosis of a helical heating tube installed in a fast breeder reactor, and a vibration of ECT probe makes the diagnosis difficult. In our previous report, we proposed an analytical model of the ECT probe incorporating with a frictional force and confirmed that the vibration was caused by Coulomb friction. In this paper, it is shown that numerical simulations utilizing the analytical model agree with various experimental results of the vibration of ECT probe, so that the reliability of the analytical model and the numerical simulation is increased. It follows that a preceding estimation of the vibration is available by the numerical simulation. Based on a behavior of the entire probe, which is obtained by the numerical simulation, we discuss a countermeasure to suppress the probe vibration. The validity of countermeasure is demonstrated through the numerical simulations.. |
| 62. | 末岡淳男，井上卓見，中野 寛，金元啓幸, 今井義之，山口智彦，大村和久，村上敬宜, 高速増殖炉ヘリカル伝熱管探傷プローブの振動によるセンサノイズとその対策（第１報，モックアップによる実験）, 日本機械学会論文集（Ｃ編）, 72, 714, PP.371-379, 2006.02. |
| 63. | 井上卓見，末岡淳男，前原猛，中野寛，金元啓幸，村上敬宜, 高速増殖炉ヘリカル伝熱管探傷プローブの振動によるセンサノイズとその対策（第2報，プローブ振動の数値シミュレーション）, 日本機械学会論文集（Ｃ編）, 72, 714, PP.380-387, 2006.02. |
| 64. | Takumi Inoue, Atsuo Sueoka, Takeshi Maehara, Yutaka Nakano, Hiroyuki Kanemoto, Yukitaka Murakami, Sensor noise caused by vibrations of flaw detection probe generated in helical heating tubes in a fast breeder reactor and its countermeasures (2nd report, numerical simulations of probe vibration), Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C, 72, 2, 380-387, 2006.02, A diagnosis of a helical heating tube installed in a fast breeder reactor is operated by an insertion of an eddy current testing (ECT) probe with magnetic sensor into the tube. An undesirable vibration of the ECT probe always happens under a certain condition and makes the diagnosis difficult. The cause of the vibration has not been clear. Numerical simulation of the vibration is implemented on the assumption that the vibration is caused by the Coulomb's friction. An analytical model is derived as a large scale nonlinear vibration system and a lot of computational costs are ordinarily required to carry out the simulations. The Transfer Influence Coefficient Method is applied so that the simulation is efficiently carried out. The results of simulation qualitatively agree well with the experimental results. It confirms the validity of the assumption that the vibration is caused by the Coulomb's friction.. |
| 65. | Atsuo Sueoka, Takumi Inoue, Yutaka Nakano, Hiroyuki Kanemoto, Yoshiyuki Imai, Toshihiko Yamaguchi, Kazuhisa Omura, Yukitaka Murakami, Sensor noise caused by vibrations of flaw detection probe generated in helical heating tubes in a fast breeder reactor and its countermeasures (1st report, experimental results by using mock-up), Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C, 72, 2, 371-379, 2006.02, This paper deals with sensor signal noise of eddy current testing (ECT) probe generated in helical heating tube in the fast breeder reactor MONJU. ECT probe is used for inspection of thickness of heating tube. The heating tube is composed of helical tube and straight tube because of advantage of thermal efficiency and compact size. However, the vibration of probe having no experience in usual straight heating tubes is generated. The vibration causes the noise and the decrease of sensor sensitivity of ECT probe. The experiment was performed by using a mock-up, and the noise characteristics of ECT sensor signal mounted in ECT probe were examined. The experimental result showed that the sensor signal noise in inserting ECT probe was higher than that in return process and the vibration in insert process had a certain outstanding frequency. It was effective for the countermeasure of sensor signal noise to attach the long and flexible guide probe to the top of ECT probe.. |
| 66. | Atsuo Sueoka, Kenichiro Matsuzaki, Takahiro Ryu, Takumi Inoue, Pattern Formation Phenomena in Contact Rotating Systems, Proc. of the 2005 International Symposium of Advanced Engineering, PP.71-76, 2005.12. |
| 67. | Takumi Inoue, Atsuo Sueoka, Takeshi Maehara, Yutaka Nakano, Hiroyuki Kanemoto, Vibration of a Flaw Detection Probe in a Heating Tubes Installed in a Fast Breeder Reactor, 11th ASIA-PACIFIC VIBRATION CONFERENCE, Vol.1, PP.294-299, 2005.11. |
| 68. | Hiroyuki Kanemoto, Takumi Inoue, Atsuo Sueoka, Detection of Fatigue Crack by Using the Harmonic Wavelet, 11th ASIA-PACIFIC VIBRATION CONFERENCE, Vol.2, PP.366-372, 2005.11. |
| 69. | 井上卓見，金元啓幸，末岡淳男，小田原悟， 村上敬宜, ハーモニックウェーブレットによる定常振動波形の異常性検出, 日本機械学会論文集（Ｃ編）, 71, 707, PP.2147-2154, 2005.07. |
| 70. | Takumi Inoue, Hiroyuki Kanemoto, Atsuo Sueoka, Satoru Odahara, Yukitaka Murakami, Detection of an abnormality in steady-state vibrations by using the harmonic wavelet, Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C, 71, 7, 2147-2154, 2005.07, This paper deals with the fault prediction of machines by detecting local abnormalities of the signal by using the wavelet transform. In this paper, the signal is a steady-state vibration waveform measured by an acceleration pick-up. The harmonic wavelet was used to detect the abnormalities of the signal. Then, it is necessary for applying the harmonic wavelets to remove the end effects and the unacceptable noise for the effective diagnosis. The authors proposed the method to remove the end effects and the noise from the signals by using the usual Fourier transform. The signals were limited to steady-state waveforms and the abnormalities of the signals were periodical. As the result, it was made clear that the local abnormalities were able to be detected from the signals due to the slight collisions caused by loose bolt and the fatigue crack generated in the in-line flow-induced vibration.. |
| 71. | 井上卓見，末岡淳男, 伝達影響係数法による閉ループを持つ構造物の面内自由振動解析, 日本機械学会論文集（Ｃ編）, 71, 706, PP.1805-1812, 2005.06. |
| 72. | Takumi Inoue, Atsuo Sueoka, Free vibration analysis of a structure with closed loops by the transfer influence coefficient method, Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C, 71, 6, 1805-1812, 2005.06, The Transfer Influence Coefficient Method (TICM), which was developed by the authors, is an effective method to analyze dynamic responses of structures. The TICM has an advantage of computational speed and accuracy compared with conventional methods. However, the TICM was not available for the structures with closed loops such as truss or rahmen structures. In this paper, a new algorithm of the TICM applicable to such truss or racmen structures is presented. The algorithm presented here is shown for the in-plane free vibration analysis of two-dimensional stuctures to make the fundamental procedure clear. The validity of the newly presented algorithm is demonstrated through a numerical computation. The present algorithm remarkably has an advantage in computationl speed compared with a conventional routine.. |
| 73. | Takahiro Ryu, Atsuo Sueoka, Yutaka Nakano, Takumi Inoue, Experimental Investigation on Squeal and Chatter Phenomena in Bicycle Disk Brakes (Part1, Regeneration Experiments of Squeal and Chatter and Their Characteristics), ASIA-PACIFIC VIBRATION CONFERENCE 2003, Vol.2, PP.579-584, 2003.11. |
| 74. | Hiroyuki Kanemoto, Takumi Inoue, Atsuo Sueoka, Detection of an abnormality in Steady State Vibrations by Wavelet Transforms: Experimental Study, ASIA-PACIFIC VIBRATION CONFERENCE 2003, Vol.1, PP.236-241, 2003.11. |
| 75. | Takumi Inoue, Atsuo Sueoka, Takahiro Ryu, In-Plane Free Vibration Analysis of a Two-Dimensional Structure with Closed Loops by the Transfer Influence Coefficient Method, ASIA-PACIFIC VIBRATION CONFERENCE 2003, Vol.1, PP.198-203, 2003.11. |
| 76. | Takumi Inoue, Atsuo Sueoka, A Step-by-Step Integration Scheme Utilizing the Cardinal B-Splines, JSME International Series C, 10.1299/jsmec.45.433, 45, 2, 433-441, 45, 2, PP.433-441, 2002.06. |
| 77. | 井上卓見，末岡淳男, カーディナルＢスプラインを利用した逐次積分法, 日本機械学会論文集（Ｃ編）, 66, 644, PP.1074-1081, 2000.04. |
| 78. | Takumi Inoue, Atsuo Sueoka, A Step-by-Step Integration Scheme Utilizing the Cardinal B-Splines, Nippon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C, 10.1299/kikaic.66.1074, 66, 644, 1074-1081, 2000.01, [URL], The authors present a new step-by-step integration scheme by utilizing the cardinal B–splines. The new method organizes conventional implicit methods such as Newmark-β method and Wilson-θ method and so on, and provides a simple computation procedure so that the step-by-step integration can be carried out efficiently. In addition, when we analyze a nonlinear system with discontinuity the computational accuracy can be improved by the approximate detection of the points of discontinuity by making good use of the two-scale relation. In this paper, we formulate an algorithm of a time historical response analysis of a straight-line beam structure as an elementary example of multi-degree of freedom system besides a simple single degree of freedom system. The cardinal B-splines used here are only the ones of orders 3 and 4 but the other cardinal B-splines are also available for the step-by-step integration in the same way.. |
| 79. | Takumi Inoue, Atsuo Sueoka, Step-by-step Integration Scheme Using the Cardinal B-Splines, ASIA-PACIFIC VIBRATION CONFERENCE '99, Vol. A, PP.749-754, 1999.12. |
| 80. | 井上卓見，末岡淳男, 伝達影響係数法を利用した逐次積分法による非線形振動系の時刻歴応答解析, 日本機械学会論文集（Ｃ編）, 65, 630, PP.433-440, 1999.02. |
| 81. | Takahiro Kondou, Atsuo Sueoka, Takumi Inoue, Forced Vibration Analysis of a Nonlinear Structure Connected in Series (Stability Analysis Based on the Argument Principle), JSME International Series C, 41, 3, 583-591, 41, 3, PP.583-591, 1998.09. |
| 82. | Takahiro Kondou, Atsuo Sueoka, Takumi Inoue, Forced vibration analysis of a nonlinear structure connected in series (Stability analysis based on the argument principle), JSME International Journal, Series C: Dynamics, Control, Robotics, Design and Manufacturing, 41, 3, 583-591, 1998.09, It is a very difficult problem to determine the stability of the periodic steady-state vibrations generated in a large-sized nonlinear system with multi-degree-of-freedom. In order to overcome such difficulty, a new practical method to accurately analyze the stability of the periodic solutions obtained from the method of harmonic balance is developed for a nonlinear structure connected in series. The present method is mainly based on the argument principle and is applicable to the stability analysis of any multi-degree-of-freedom system excited parametrically. By introducing the same treatment as that of the incremental transfer influence coefficient method into the computation process of the present method, the computation speed is improved and the memory size required in the computation is considerably reduced. The validity of the present method is confirmed by the results of numerical computation for some examples.. |
| 83. | Takumi Inoue, Atsuo Sueoka, Yoshiyuki Shimokawa, Time Historical Response Analysis by Applying the Transfer Influence Coefficient Method, ASIA-PACIFIC VIBRATION CONFERENCE '97, Vol.Ⅰ, PP.471-476, 1997.11. |
| 84. | 井上卓見，末岡淳男，藤本俊郎, 大規模構造物の時刻歴応答解析（伝達影響係数法の適用による計算能率と数値的安定性の改善）, 日本機械学会論文集（Ｃ編）, 62, 604, PP.4558-4566, 1996.12. |
| 85. | Takumi Inoue, Atsuo Sueoka, Toshio Fujimoto, Time historical response analysis of large-scaled structures (Improvement of computational efficiency and numerical stability by applying the transfer influence coefficient method), Nippon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C, 10.1299/kikaic.62.4558, 62, 604, 4558-4566, 1996.01, [URL], A method of time historical response analysis for large-scale structures is presented. This method is derived from a combination of the transfer influence coefficient method and the Newmark-β or Wilson-θ method, and it improves the computational efficiency and accuracy of the transient response analysis remarkably by means of several advantages of the transfer influence coefficient method. The present method is free of the numerical instabilities which often occur in using the Newmark-β or Wilson-θ method combined with the transfer matrix method or the Runge-Kutta-Gill method. An algorithm for the transient response is formulated for the three-dimensional tree structure which is mainly found in pipeline systems. We regard the tree structure as a lumped mass system here. The validity of the present method compared with other methods for transient analysis is demonstrated through various numerical computations.. |
| 86. | Takumi Inoue, Takahiro Kondou, Atsuo Sueoka, Application of the Transfer Influence Coefficient Method to Eigenvalue Analysis, ASIA-PACIFIC VIBRATION CONFERENCE '95, Vol. Ⅱ, PP.606-611, 1995.11. |
| 87. | 近藤孝広，阿久根光明，井上卓見，末岡淳男, 伝達影響係数法を結合した逆反復法による回転体の安定性解析, 福岡工業大学エレクトロニクス研究所所報, 第12巻, 1995.10. |
| 88. | 井上卓見，近藤孝広，末岡淳男, 逆反復法に対する伝達影響係数法の適用, 日本機械学会論文集（Ｃ編）, 61, 583, PP.783-790, 1995.03. |
| 89. | 近藤孝広，井上卓見，末岡淳男, 増分伝達影響係数法による直線状はり構造物の非線形強制振動解析, 福岡工業大学エレクトロニクス研究所所報, 第11巻, 1994.10. |
| 90. | 井上卓見，末岡淳男，近藤孝広, 伝達影響係数法による二次元，三次元樹状構造物の線形強制振動解析, 日本機械学会論文集（Ｃ編）, 60, 572, PP.1159-1166, 1994.04. |
| 91. | 近藤孝広，末岡淳男，井上卓見, 直列形非線形構造物の強制振動解析（偏角原理に基づく安定判別法の提案）, 日本機械学会論文集（Ｃ編）, 60, 571, PP.735-742, 1994.03. |
| 92. | Takahiro Kondou, Takumi Inoue, Atsuo Sueoka, A Method of Stability Analysis Based on the Argument Principle for Nonlinear Multi-Degree-of-Freedom Systems, ASIA-PACIFIC VIBRATION CONFERENCE '93, Vol.4, PP.1621-1626, 1993.11. |
| 93. | Takumi Inoue, Atsuo Sueoka, Takahiro Kondou, Forced Vibration Analysis of a Tree Structure by the Transfer Influence Coefficient Method, ASIA-PACIFIC VIBRATION CONFERENCE '93, Vol.3, PP.1221-1226, 1993.11. |
| 94. | 近藤孝広，末岡淳男，井上卓見, 多自由度非線形振動系における定常周期解の安定判別法について, 福岡工業大学エレクトロニクス研究所所報, 第10巻, 1993.10. |
| 95. | 近藤孝広，末岡淳男，田中宏信，井上卓見，劉孝宏，綾部隆, 直列形非線形構造物の強制振動解析（第２報，断片線形系の取扱いと数値計算結果）, 日本機械学会論文集（Ｃ編）, 58, 549, PP.1343-1351, 1992.05. |
| 96. | 近藤孝広，末岡淳男，井上卓見, 直列形非線形構造物の強制振動解析（第１報，増分伝達影響係数法の提案）, 日本機械学会論文集（Ｃ編）, 58, 548, PP,995-1003, 1992.04. |
| 97. | 山本元司，井上卓見，毛利彰, マニプレータの近似最短時間軌道計画, 日本機械学会論文集（Ｃ編）, 55, 516, PP.2077-2082, 1989.08. |
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