Takumi Inoue | Last modified date：2024.01.25 |

Professor /
Dynamics of Machinery /
Department of Mechanical Engineering /
Faculty of Engineering

**Papers**

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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.. |

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6. | Non-contact detection of heat seal defect using the coincidence effect of airborne ultrasound Kenta Mori, Takumi Inoue, Ren Kadowaki Transactions of the Japan Society of Mechanical Engineers DOI: 10.1299/transjsme.19-00381. |

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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. | Diagnosis of bolt loosening using reflected ultrasonic pulse Ren Kadowaki, Shoki Ikeda, Takumi Inoue Transactions of the Japan Society of Mechanical Engineers DOI: 10.1299/transjsme.18-00202, [URL]. |

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. | Nondestructive evaluation of seal strength of heat sealing using instantaneous frequency of ultrasonic pulse Takumi Inoue, Ren Kadowaki and Kenta Mori Transactions of the JSME (in Japanese). |

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. | Evaluation of internal boundary surface using instantaneous frequency of ultrasonic pulse Takumi Inoue, Takahiro Nakano and Ren Kadowaki Transactions of the JSME (in Japanese) . |

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, 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. | Takahiro Nakano, Takumi Inoue, Estimation of Inner State Using Instantaneous Frequency of Ultrasonic Wave, Theoretical and Applied Mechanics Japan, 60, 135-142, 2012.02. |

25. | 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.. |

26. | Takahiro Nakano, Takumi Inoue, Evaluating Adhesive Strength of Epoxy Resin Using Instantaneous Frequency of Ultrasonic Pulse, APVC2011, 14th Asia Pacific Vibration Conference, 2011.12. |

27. | New Diagnostic Method Using Instantaneous Frequency of Ultrasonic Pulse (Evaluation of Adhesive Strength of Epoxy Resin), Takumi Inoue, Takahiro Nakano, Transactions of the Japan Society of Mechanical Engineers, Vol.77 No.780, PP.2993-3006. |

28. | 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. |

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, 10.1016/j.jsv.2010.08.027, 330, 10, 2138-2149, 2011.05, 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.. |

30. | 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. |

31. | 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.. |

32. | 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.. |

33. | 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. |

34. | 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. |

35. | 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.. |

36. | 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. |

37. | Takahiro Nakano, Takumi Inoue, Estimation of Inner Condition by the Frequency Modulation in Ultrasonic Wave, APVC2009, 13th Asia Pacific Vibration Conference, 2009.11. |

38. | Takumi Inoue, Takahiro Nakano, Takahiro Ryu, Forecast of Tool Failure in Grinding Process of Ceramic, APVC2009, 13th Asia Pacific Vibration Conference, 2009.11. |

39. | 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. |

40. | 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. |

41. | 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. |

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, 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.. |

43. | 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. |

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, 10.1016/j.nucengdes.2007.11.002, 238, 6, 1459-1470, 2008.06, 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.. |

45. | Estimation of Time-varying Vibration Parameters by the Segmental Use of the Harmonic Wavelet Takumi Inoue, Atsuo Sueoka, Shingo Okazawa Transactions of the Japan Society of Mechanical Engineers(C), May, 2008 Vol.74, No.741, PP.1145-1153. |

46. | 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.. |

47. | 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. |

48. | 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. |

49. | 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. |

50. | 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. |

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, 10.1016/j.ymssp.2006.09.002, 21, 5, 2041-2055, 2007.07, 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.. |

52. | 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. |

53. | 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. |

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, 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.. |

55. | 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. |

56. | 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. |

57. | 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, 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.. |

58. | 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, 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.. |

59. | Sensor Noise Caused by Vibrations of Flaw Detection Probe Generated in Helical Heating Tubes in a Fast Breeder Reactor and Its Countermeasures (Part 3, Parameter Study by Numerical Simulations) Takumi Inoue, Takeshi Maehara, Atsuo Sueoka, Yutaka Nakano, Hiroyuki Kanemoto, Yukitaka Murakami Transactions of the Japan Society of Mechanical Engineers(C), Oct., 2006 Vol.72, No.722, PP.3185-3192. |

60. | 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), |

61. | Sensor Noise Caused by Vibrations of Flaw Detection Probe Generated in Helical Heating Tubes in a Fast Breeder Reactor and Its Countermeasures (Part 1, Experimental Results by Using Mock-up) Atsuo Sueoka, Takumi Inoue, Yutaka Nakano, Hiroyuki Kanemoto, Yoshiyuki Imai, Toshihiko Yamaguchi, Kazuhisa Omura, Yukitaka Murakami Transactions of the Japan Society of Mechanical Engineers(C), Feb., 2006 Vol.72, No.714, PP.371-379. |

62. | Sensor Noise Caused by Vibrations of Flaw Detection Probe Generated in Helical Heating Tubes in a Fast Breeder Reactor and Its Countermeasures (Part 2, Numerical Simulations of Probe Vibration) Takumi Inoue, Atsuo Sueoka, Takeshi Maehara, Yutaka Nakano, Hiroyuki Kanemoto, Yukitaka Murakami Transactions of the Japan Society of Mechanical Engineers(C), Feb., 2006 Vol.72, No.714, PP.380-387. |

63. | 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), |

64. | 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), |

65. | 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. |

66. | 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. |

67. | 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. |

68. | Detection of an Abnormality in Steady-State Vibrations by Using the Harmonic Wavelet Takumi Inoue, Hiroyuki Kanemoto, Atsuo Sueoka, Satoru Otahara, Yukitaka Murakami Transactions of the Japan Society of Mechanical Engineers(C), July 2005 Vol.,71, No.707, PP.2147-2154. |

69. | Takumi Inoue, Hiroyuki Kanemoto, Atsuo Sueoka, Satoru Odahara, Yukitaka Murakami, Detection of an abnormality in steady-state vibrations by using the harmonic wavelet, |

70. | Free Vibration Analysis of a Structure with Closed Loops by the Transfer Influence Coefficient Method Takumi Inoue, Atsuo Sueoka Transactions of the Japan Society of Mechanical Engineers (C), June 2005 Vol., 71, No. 706, PP.1805-1812. |

71. | Takumi Inoue, Atsuo Sueoka, Free vibration analysis of a structure with closed loops by the transfer influence coefficient method, |

72. | 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. |

73. | 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. |

74. | 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. |

75. | 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. |

76. | A Step-by-Step Integration Scheme Utilizing the Cardinal B-Splines Takumi Inoue, Atsuo Sueoka Transactions of the Japan Society of Mechanical Engineers 66, 644, PP.1074-1081. |

77. | 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, 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.. |

78. | 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. |

79. | Time Historical Response Analysis of Nonlinear Vibration Systems by the Step-by-Step Integration Scheme Utilizing the Transfer Influence Coefficient Method Takumi Inoue, Atsuo Sueoka Transactions of the Japan Society of Mechanical Engineers 65, 630, PP.433-440. |

80. | 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. |

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 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.. |

82. | 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. |

83. | Time Historical Response Analysis of Large-Scaled Structures (Improvement of Computational Efficiency and Numerical Stability by Applying the Transfer Influence Coefficient Method Takumi Inoue, Atsuo Sueoka, Toshio Fujimoto Transactions of the Japan Society of Mechanical Engineers 62, 604, PP.4558-4566. |

84. | 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, 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.. |

85. | 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. |

86. | Stability Analysis of Rotor Systems by Inverse Iteration Method Combined with the Concept of Transfer Influence Coefficient Method Takahiro Kondou, Mitsuaki Akune, Takumi Inoue, Atsuo Sueoka Fukuoka Institute of Technology Electronics Research Laboratory, Oct 1995, 12, PP. 25-31. . |

87. | Application of Transfer Influence Coefficient Method to Inverse Iteration Method Takumi Inoue,Takahiro Kondou, Atsuo Sueoka Transactions of the Japan Society of Mechanical Engineers 61, 583, PP.783-790. |

88. | Nonlinear Forced Vibration analysis of a Straight-Line Beam Structure by the Incremental Transfer Influence Coefficient Method Takahiro Kondou, Takumi Inoue, Atsuo Sueoka Fukuoka Institute of Technology Electronics Research Laboratory, Oct 1994, 11, PP. 11-17. . |

89. | Linear Forced Vibration Analysis of Two- and Three-dimensional Tree Structures by the Transfer Influence Coefficient Method Takumi Inoue, Atsuo Sueoka, Takahiro Kondou Transactions of the Japan Society of Mechanical Engineers 60, 572, PP.1159-1166. |

90. | Forced Vibration Analysis of a Nonlinear Structure Connected in Series (Stability Analysis Based on the Argument Principle) Takahiro Kondou, Atsuo Sueoka, Takumi Inoue Transactions of the Japan Society of Mechanical Engineers 60, 571, PP.735-742. |

91. | 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. |

92. | 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. |

93. | Stability Analysis for Periodic Solutions of a Nonlinear Muliti-Degree-of-Freedom System Takahiro Kondou, Atsuo Sueoka, Takumi Inoue Fukuoka Institute of Technology Electronics Research Laboratory, Oct 1993, 10, PP. 7-13. . |

94. | Forced Vibration Analysis of a Nonlinear Structure Connected in Series (2nd Report, Treatment for a Piecewise Linear System and Numerical Computational Results) Takahiro Kondou, Atsuo Sueoka, Hironobu Tanaka, Takumi Inoue, Takahiro Ryu, Takashi Ayabe Transactions of the Japan Society of Mechanical Engineers 58, 549, PP.1343-1351. |

95. | Forced Vibration Analysis of a Nonlinear Structure Connected in Series (1st Report, Suggesting the Incremental Transfer Influence Coefficient Method) Takahiro Kondou, Atsuo Sueoka, Takumi Inoue Transactions of the Japan Society of Mechanical Engineers 58, 548, PP,995-1003. |

96. | Planning of Near-Minimum Time Trajectories for Manipulators Motoji Yamamoto, Takumi Inoue, Akira Mohri Transactions of the Japan Society of Mechanical Engineers 55, 516, PP.2077-2082. |

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