| 雉本 信哉（きじもと しんや） | データ更新日：2024.03.27 |
教授 ／
工学研究院
機械工学部門
力学システム
| 1. | Shoma KIKIUCHI, Akira MIKI, Shinya KIJIMOTO, Satoshi ISHIKAWA, Yosuke KOBA, Toshio INOUE, Xun WANG, Region Separation Control for Broadband Sounds by Multiple Sources, PROCEEDINGS of the 24th International Congress on Acoustics, 2022.10. |
| 2. | Yoshihisa Takayama , Shinya Kijimoto, Satoshi Ishikawa, Eddy Current Damper Model of Ring Magnet and Coaxially Moving Conducting Disk, IEEE Transactions on Magnetics, 57, 9, 8107513, 2021.09, An eddy current damper comprising a magnet and a conducting plate moving perpendicularly to it is called a perpendicularmotion-type eddy current damper, whereas one with a magnet and a conducting plate moving parallel to it is called a parallelmotion-type eddy current damper. In this article, a method of using magnetic vector potentials in a stationary-conductor coordinate system to obtain easily the damping coefficient (the A method) is proposed and applied to a perpendicular-motion-type eddy current damper comprising a ring magnet and conducting disk. The previously proposed coil method is also applied. Because both methods utilize the magnetic flux densities and magnetic vector potentials obtained using a circular current loop, they cannot be considered to be the effect of the magnetic field generated by eddy currents on the damping coefficients. However, the damping coefficients were in good agreement with those obtained using a 3-D finite element method (3-D-FEM). Hence, the effect of the secondary magnetic field can be ignored. Moreover, the A method is as precise as the 3-D-FEM, is less complicated, and does not require an air region and boundary conditions for computation. In addition, although the errors of the damping ratios calculated from measured data and the A method were 17%, the error of the modified damping ratios obtained by applying the equivalent mass of the disk to the A method decreased to 6%.. |
| 3. | Kazuya YOKOTA, Satoshi ISHIKAWA, Kousuke TAKEZAKI, Yosuke KOBA, Sshinya KIJIMOTO, Numerical analysis and physical consideration of vocal fold vibration by modal analysis, Journal of Sound and Vibration, https://doi.org/10.1016/j.jsv.2021.116442, 514, 116442, 2021.12, [URL], Vocal fold vibration is self-excited vibration due to the interaction between the vocal folds and expired air. To analyze vocal fold vibration, several models comprising masses and springs have been proposed to date, but with those models it is difficult to determine parameter values and calculate the phenomenon in detail. Also, several researchers have analyzed vocal fold vibration using the finite element method (FEM) and the finite volume method, but such large-degree-of-freedom analyses incur high computational cost. To solve these problems, we propose a vocal fold vibration analysis model based on modal analysis. The natural modes of the vocal folds are obtained by FEM, and the air is simulated by a one-dimensional model based on Bernoulli's equation. In this approach, because the natural modes are obtained by FEM, parameters based on actual physical properties (Young's modulus, etc.) can be used, and the calculation cost is relatively low because of the modal and one-dimensional fluid analyses. To validate the proposed model, its results are compared with those from experiments on silicone vocal folds and simulations using ANSYS software, and the results correspond. Furthermore, the necessary conditions for the vocal folds to enter two particular modes of self-excited vibration are derived mathematically, and those two modes are confirmed to be dominant in the periodic solution region.. |
| 4. | Satoshi Ishikawa, Ryosuke Hirata, Shinya Kijimoto, Improved effectiveness of acoustic absorbing materials by using air layers in a one-dimensional tube, Applied Acoustics, 178, 2021.07, Acoustic absorbing materials are used in various applications to reduce noise. In air ducts and pipes, they are used to attenuate noise from devices such as fans. When an absorbing material is installed across the entire cross-section of a duct, sound wave attenuation is large, but so is pressure loss in the flow. For greater effectiveness with less acoustic absorbing material in a one-dimensional tube system, we propose a method in which layers of acoustic absorbing material are separated by air layers and we derive the transmission loss in this method. A parametric study was performed to confirm the effectiveness of the air layers and investigate characteristics of the system. The results show that the method’s effectiveness is due to the antiresonance properties of the air layers. An experiment with an acoustic tube was performed to assess the validity of the proposed method and the derived transmission loss. The experimental and numerical results for transmission loss agree well, indicating the proposed method is effective when acoustic absorbing material layers are used.. |
| 5. | Satoshi Ishikawa, Katsunori Tanaka, Daiki Yano, Shinya Kijimoto, Design of a disc-shaped viscoelastic damping material attached to a cylindrical pipe as a dynamic absorber or Houde damper, Journal of Sound and Vibration, 10.1016/j.jsv.2020.115272, 475, 2020.06, [URL], The vibration of pipes and cylindrical shells leading to noise and damage is an important engineering problem in plant systems and air conditioners, among others. To attenuate such vibration, a viscoelastic material is attached to a pipe as a damping material. Generally, the viscoelastic material covers the entire pipe to provide damping due to elongation of the material, but this requires a large amount of viscoelastic material. To overcome this problem, the approach adopted in this paper is to attach the viscoelastic material to only part of the pipe. The vibration of the pipe is then attenuated by not only the damping due to the viscoelastic material but also by the viscoelastic material acting as either a dynamic absorber or Houde damper. The disc-shaped viscoelastic material attached to the pipe is modeled as either a mass–spring–damper system or mass–damper system, and design guidelines are proposed for the material based on invariant-point theory. To assess the validity of the proposed design method, hammering tests are performed involving designed silicone attached to a pipe. The first- and second-order resonances of the pipe are attenuated by the silicone as a dynamic absorber and a Houde damper, respectively.. |
| 6. | 田中 亮太郎, 木庭 洋介, 石川 諭, 雉本 信哉, 能動音響制御と音声分離手法を用いた音声明瞭化, 日本機械学会論文集, 10.1299/transjsme.19-00164, 86, 882, 2020.02, Active noise control (ANC) is a technique used to reduce environmental noise in noisy places such as office or aircraft cabin. ANC reduces the overall input signal even when it has necessary information such as conversation as well as noise. In other words, conventional ANC has the disadvantage of reducing the required sound. On the other hand, there are scenes where conversation is desired even in a noisy environment. However, since the entire input signal is reduced, it cannot be solved even by using conventional ANC. We propose speech separation ANC system which separate announce and noise then control only noise component by ANC. To separate noise from the input signal, we focus on the signal separation method of spectral subtraction method and harmonic extraction method. These methods are simple and require a small computational load but have the disadvantage of leaving an estimated noise component. We also propose two signal separation methods which remain less noise component. In this paper, we verify the effectiveness of the proposed signal separation method while comparing it with the conventional signal separation method. Furthermore, the sound attenuation performance of the proposed method is confirmed by a control experiment in an anechoic room..  |
| 7. | Daiki Yano, Satoshi Ishikawa, Katsunori Tanaka, Shinya Kijimoto, Vibration analysis of viscoelastic damping material attached to a cylindrical pipe by added mass and added damping, Journal of Sound and Vibration, 10.1016/j.jsv.2019.04.023, 454, 14-31, 2019.08, [URL], Vibration of pipes and cylindrical shells leading to noise and damage is an important engineering problem in plant systems and air conditioners, among others. To attenuate such vibration, a viscoelastic material is attached to pipes as a damping material. To predict the vibration reduction effect in detail, three-dimensional finite-element analysis is usually conducted considering the characteristics of the viscoelastic material, but such analysis requires considerable computation time. To overcome this problem, this study proposes added mass and added damping to address the effects of vibration of the damping material on the vibration of a pipe. By this method, one-dimensional analysis can be performed. To assess the validity of the proposed method, numerical results for the vibration of a pipe fitted with silicone obtained using the proposed method are compared with measurements from a hammering test and numerical results from three-dimensional analysis. The computational results obtained using the proposed method agree very well with the measurements and the three-dimensional numerical results. Furthermore, it is found that the vibration of the pipe is attenuated by not only the damping of the viscoelastic material but also the effect of dynamic behavior similar to that of a dynamic absorber.. |
| 8. | Kazuya Yokota, Satoshi Ishikawa, Yosuke Koba, Shinya Kijimoto, Shohei Sugiki, Inverse analysis of vocal sound source using an analytical model of the vocal tract, Applied Acoustics, 10.1016/j.apacoust.2019.02.005, 150, 89-103, 2019.07, [URL], Diseases occurring near the vocal cords, such as laryngeal cancer, share the initial symptom of hoarseness of voice. The GRBAS (grade, roughness, breathiness, asthenia, strain) scale is used as an acoustic diagnostic method for these diseases, but its objectivity is not well established. Instead, more accurate diagnosis may be possible by capturing the waveform of the volume velocity at the vocal cords. The aim of this study is to enable voice disturbances to be diagnosed by identifying the sound-source waveform from voice measurements. For acoustic analysis of the vocal tract, we modeled the air inside it as concentrated masses connected by linear springs and dampers. We identified the shape of the vocal tract by making the natural frequencies of the analytical model correspond to the measured formant frequencies, and we calculated the sound-source waveform from the measured voice waveform. To assess the validity of the model, we measured actual voices and used the model to identify the vocal tract shapes and corresponding sound-source waveforms. The identified waveforms have an asymmetrical triangular form, which is a feature of actual human sound-source waveforms. Local solutions allow multiple vocal tract shapes to be identified from a single sample. However, mathematical analysis showed that these differ only in the amplitude of the sound-source waveform, which does not affect the waveform shape. Furthermore, we built an experimental device that simulates the human voice mechanism and comprises an acrylic vocal tract and a piston. We confirmed that the identified sound sources are similar to measured sound sources. We therefore conclude that our proposed methods are valid.. |
| 9. | Kazuya Yokota, Satoshi Ishikawa, Yosuke Koba, Shinya Kijimoto, Inverse analysis of vocal sound source by acoustic analysis of the vocal tract, 26th International Congress on Sound and Vibration, ICSV 2019 Proceedings of the 26th International Congress on Sound and Vibration, ICSV 2019, 2019.07, Diseases occurring near the vocal cords, such as laryngeal cancer, often cause voice disturbance as an initial symptom. As an acoustic diagnostic method for such diseases, the GRBAS (grade, roughness, breathiness, asthenia, strain) scale is widely used, but its objectivity is not well established. Instead, more accurate diagnosis may be possible by capturing the waveform of the volume velocity at the vocal cords (the vocal sound-source waveform). The aim of this study is to enable diagnosis of diseases near the vocal cords by identifying the sound-source waveform from voice measurements. In the proposed method, an analytical model of the vocal tract is used to identify the sound source. The air inside the vocal tract is modeled as concentrated masses connected by linear springs and dampers. The vocal tract shape is identified by making the natural frequencies of the analytical model correspond to the measured formant frequencies. The sound-source waveform is calculated from the analytical model by applying the measured voice (sound pressure) to the lip position of the identified vocal tract. To assess the validity of the proposed method, an experimental device was made to simulate the human voice mechanism. The device is equipped with artificial vocal cords made of a urethane elastomer that are self-excited by air flow. The sound pressure equivalent to the voice was measured using a microphone set at the lip position of the experimental device, and the flow velocity at the artificial vocal cords was measured using a laser Doppler velocimeter (LDV). To assess the model's validity, the sound-source waveform identified from the measured sound pressure was compared with the waveform measured using the LDV. |
| 10. | 山下 大地, 木庭 洋介, 石川 諭, 雉本 信哉, 能動音響制御と周波数スペクトル平坦化による低騒音な音声マスキング手法, 日本機械学会, 10.1299/transjsme.18-00146, Vol. 84, No. 866, p. 18-00146, 2018.10, Sound masking is a method that used for protecting speech privacy of conversation at public open space such as a pharmacy or a bank window. In a conventional masking, a masking sound is used to cover contents of conversation. This masking sound which is generated from a loudspeaker allow a third party not to understand what is said, but there is a problem that the sound level is increased because of a masking sound. Against this problem, we proposed Low-noise sound masking method using active noise control (ANC). The approach of this method is to make spectrum of phonemes flat by control sound. It is difficult to recognize phonemes that are processed by this method because the major factor determining the phonemes in speech recognition is the relative relationship of the peaks of its spectrum. In this paper, the sound attenuation performance of the proposed method is validated by control experiments in an anechoic chamber. Moreover, a listening experiment is carried out to investigate the sound masking performance. The result show that comparing with the conventional sound masking method, the proposed method can achieve the sound masking effect with a smaller sound pressure level.. |
| 11. | 横田 和哉, 木庭 洋介, 石川 諭, 雉本 信哉, 音響伝達特性の変化を考慮した評価点移動時の能動音響制御, 日本機械学会, https://doi.org/10.1299/transjsme.17-00446, Vol. 84, No. 859, p. 17-00446, 2018.10, Because of using interference of sound wave, it is difficult to control in whole three-dimensional acoustic field by Active Noise Control (ANC). Instead, around-head-control is investigated in this paper. In this system, two error microphones are set near ears, and noise is reduced around evaluation points locally. This system requires fast adaptation speed of controller following movement of head, and a problem still remains that the control effect during movement becomes worse. Against this problem, we propose Modified Reference signal Method (MRM). This method improves adaptation speed during movement, by modification of filtering of input signal in Filtered-x. The secondary path model that controller requires is interpolated by the method Ohno et al. proposed. There is modeling error of secondary path caused by interpolation and measuring error of it, and this modeling error causes divergence of controller. In this paper, suppression method of divergence is also investigated. Suppression of divergence is executed by addition of penalty term to evaluation value, and it is equivalent to ridge regression mathematically. Proposed method requires a large number of matrix calculations, therefore reducing method of computational complexity according to acoustic characteristics is also investigated in this paper. The validity of the proposed method is shown by numerical simulation and experiment.. |
| 12. | Satoshi Ishikawa, Ataru Matsuo, Yuta Akayama, Shinya Kijimoto, Coupled analysis of two-dimensional acoustic and membrane vibration by concentrated mass model Proposal of spurious mode elimination model, Advances in Mechanical Engineering, 10.1177/1687814017746512, 9, 12, 2017.12, [URL], When using the finite element method for structural–acoustic coupled analysis, the mass and stiffness matrices are not symmetric because the acoustic space is described by sound pressure and the structure is described by displacement. Therefore, eigenvalue analysis requires a long computational time. In this article, we proposed concentrated mass models for performing structural–acoustic coupled analysis. The advantage of this model is that the mass and stiffness matrices become symmetric because both the acoustic space and the membrane are described by the displacement of the mass points. Furthermore, our models do not generate spurious modes and zero eigenvalues that arise in finite element method whose variable is displacement in acoustic space. To validate the proposed models, the natural frequency obtained using the concentrated mass models is compared with the natural frequency found using finite element method. These results are in good agreement, and spurious modes and zero eigenvalues are not generated in the proposed model whose variables are sound pressure. Furthermore, we compare the proposed model with finite element method in terms of the calculation time required for the eigenvalue analysis. Because the matrices of the proposed models are symmetric, these eigenvalue analyses are faster than that of finite element method, whose matrices are asymmetric. Therefore, we conclude that the proposed model is valid for coupled analysis of a two-dimensional acoustic space and membrane vibration and that it is superior to finite element method in terms of calculation time.. |
| 13. | 久野 翔太郎, 石川 諭, 雉本 信哉, 木庭 洋介, 集中系モデルを用いた2次元音響空間の能動騒音制御, 日本機械学会論文集, 10.1299/transjsme.17-00305, 83, 854, 17-00305-17-00305, 2017.10, [URL], Several adaptive feedforward control methods have been proposed in previous research on active noise control. In those methods, noise control is achieved by adding in a reverse-phase control sound of the same amplitude to noise near an error microphone. Because this method is aimed at controlling only noise near the error microphone, the control area is inherently narrow. Here, we propose an alternative method of noise control for an entire closed space. The proposed method is based on state feedback control and modeling of the acoustic space by the concentrated-mass model. The acoustic space is modeled as masses, connecting springs, and connecting dampers. Further, a loudspeaker as control source is also modeled as a mass-spring-damper system. We previously reported a method for simple one-dimensional acoustic space control. In this paper, we show the design of a control system for two-dimensional acoustic spaces. The acoustic space and loudspeakers are modeled in a concentrated-mass model, and the state feedback control system is realized as a Kalman filter with pole placement. The number of degrees of freedom is reduced by using modal analysis, which reduces the computation time of the controller. Experiments and numerical simulation of the coupled system were conducted to confirm the validity of the analysis model. Noise in the acoustic space was experimentally controlled, with the finding that noise in the entire acoustic space was reduced around the resonance frequencies. Furthermore, the limit of the control effect are considered within the proposed system.. |
| 14. | Xun Wang, Takayuki Satake, Yosuke Koba, Satoshi Ishikawa, Shinya Kijimoto, Active reduction of the two-way diffraction from a noise barrier by using feedforward control, 45th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future, INTER-NOISE 2016 Proceedings of the INTER-NOISE 2016 - 45th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future, 576-586, 2016.08, This paper develops a feedforward (FF) structure based active noise control (ANC) system that reduces the two-way diffraction from an office partition with the aim of actively creating isolated acoustic domains in open-plan offices. The FF-ANC system can only reduce the noise downstream of the reference sensor due to the causality requirement. Therefore, a coupled FF control structure is proposed to realize the reduction of two-way diffraction. This system applies a two-source loudspeaker array as the control source, and two microphones as the reference and error sensors. The directivity of the loudspeaker array is controlled to emit the control sound only into the corresponding control area. In comparison with the preceding active diffraction reducing systems, using a directivity controlled loudspeaker array can generate an absorptive acoustic boundary rather than a reflective boundary on the diffracting edge, which can isolate the acoustic environment without adding reverberation in a room. The effectiveness of the proposed system is verified by computer simulations.. |
| 15. | Xun Wang, Yousuke Koba, Satoshi Ishikawa, Shinya Kijimoto, Hybrid active noise barrier with sound masking in open-plan offices, Noise Control Engineering Journal, 10.3397/1/376389, 64, 3, 403-415, 2016.05, [URL], This paper presents a small-typed active noise barrier (ANB) with sound masking techniques for alleviating the noise problem and protecting the speech privacy in open-plan offices. This soundproof system reduces and masks the undesired sound simultaneously so that lower level of the masker is required to achieve the sound masking effect, comparing with the conventional sound masking systems. First, a real-time experiment to verify the noise attenuation performance of the proposed system for practical application has been conducted in a real office room. In the experiment, the influence of background noise on the system performance has also been investigated. The experiment results show that 3-8 dB active noise attenuation can be achieved behind the ANB in an office room. Moreover, in order to select an appropriate masker for the sound masking part of the system, several maskers have been compared and investigated by listening experiments. The results suggest that the stationary maskers are more suitable for the sound masking in offices by considering the sound masking performance and the annoyance of the maskers comprehensively.. |
| 16. | 王循, 木庭洋介, 石川 諭, 雉本 信哉, ハイブリッドANCシステムを用いた能動的遮音壁(ロバスト性能を確保できる適応型フィードバックANCシステムの提案及び適用), 日本機械学会, 10.1299/transjsme.15-00532, Vol. 82, No. 835, 15-00532-15-00532, p. 15-00532, 2016.02, In this paper, an adaptive robust feedback (FB) active noise control (ANC) system is proposed and applied to the previously developed active noise barrier (ANB) using a hybrid (HB) ANC system, which aims to relieve the indoor noise problem. The FB control is preferred for this small-typed ANB application because only error sensor is required for the FB control system so that a compact controller can be easily realized. In practice, however, the robust stability of the FB controller must be considered. Moreover, the waterbed effect of the FB control will cause noise enhancement at some frequencies out of the target band of control. In order to design a robust controller with limited noise enhancement in real-time control, a modified frequency domain block LMS (modified FDB-LMS, MFDB-LMS) algorithm, which has the reduced computation complexity and the same steady-state performance comparing with the conventional FDB-LMS algorithm, is proposed in this paper, firstly, owing to the easiness to verify the robust stability and the noise enhancement constraints in the frequency domain adaptive process. Then, an internal model control (IMC) typed FB-ANC system exploiting the MFDB-LMS algorithm, into which the constraints to guarantee the robust stability and limit the noise enhancement to within a given value has been integrated, is proposed and applied to the ANB. The effectiveness of the proposed FB-ANC system and the noise attenuation performance of the ANB using the proposed system have been validated by simulations.. |
| 17. | Xun Wang, Yosuke Koba, Satoshi Ishikawa, Shinya Kijimoto, An adaptive method for designing a robust IMC structured feedback active noise controller, Noise Control Engineering Journal, 10.3397/1/376344, 63, 6, 496-507, 2015.11, [URL], In this paper, a method for designing a robust internal model control (IMC) structured feedback active noise controller is considered. For feedback active noise control (ANC) systems, the IMC structure is preferred because of the possibility of applying an adaptive filter in the controller and the simplicity of satisfying the stability if an accurate secondary path model is available. In practice, however, model uncertainties exist so that the robust stability of the controller must be considered during the controller design process. Moreover, the waterbed effect for feedback control of a time-delayed system will cause noise amplification (NA) at some frequencies out of the target band of control. Against these problems, this paper proposes a controller design method in which a constraint for the control filter coefficients is found to ensure the robust stability and limit the NA caused by the waterbed effect to within a given value. In comparison with the design process in the frequency domain, this method can use an adaptive algorithm to obtain a robust controller solution in the time domain. Once the time domain constraint has been obtained, it can also be used in the online IMC feedback ANC system. Computer simulations and experiments in an anechoic chamber are performed to validate the method. The results indicate that this method is effective for the design of a robust controller with constrained NA.. |
| 18. | 王循, 木庭洋介, 石川 諭, 雉本 信哉, ハイブリッドANCシステムを用いた能動的遮音壁(ウォーターベッド効果による増音の抑制及び各種音場における減音効果の考察), 日本機械学会, 10.1299/transjsme.15-00064, Vol. 81, No. 827, 15-00064-15-00064, p. 15-00064, 2015.07, In this paper, the hybrid active noise control (HB-ANC) system applied in the active noise barrier (ANB) is improved, and the noise attenuation performace of the ANB is invetigated under four different sound field configurations. This hybird ANB reduces the diffraction noise from top of the ANB and the noise propagated to the head position of the target person behind the ANB simultaneously to achieve higher noise attenuation. However, the waterbed effect of the feedback control part of the HB-ANC system will cause noise enhancement at some frequencies in the control area. In order to solve this problem, the HB-ANC system is improved by adding a filter to cancel the noise enhancement caused by the waterbed effect. Then, the noise attenuation performance of the hybrid ANB under four sound field configurations is evaluated by simulations. The sound field configurations are set up to investigate how the diffraction from side of the ANB and the reflection influence the performance of the ANB. An experiment in the anechoic chamber is also conducted. The results indicate that the low frequency noise attenuation can be obtained in a wide area behind the ANB, and at the head position of the person, the noise attenuation can be ensured within a wider frequency range, even for the sound fields where the uncontrolled diffraction from side and the reflection exist.. |
| 19. | 石川 諭, 雉本 信哉, 木庭洋介, 藤原 圭佑, 集中系モデルを用いた押込試験による生体柔軟性計測技術の開発, 日本機械学会論文集, 10.1299/transjsme.14-00480, 81, 823, 14-00480-14-00480, 2015.03, Palpation is an important diagnostic technique in medicine. However, it is subjective, and successful diagnosis depends on the skill and experience of the doctor. Therefore, a quantitative method for measuring the hardness of the living body and detecting abnormal tissue is desirable. In this paper, we propose a concentrated mass model of the body to analyze its motion in an indentation test. The model consists of masses, connecting springs, connecting dampers, base support springs, and base support dampers. The mass is the mass of the elastic body, the connecting spring is derived from the normal stress, and the base support spring is derived from the shear stress. Furthermore, we develop a method to measure the Youngs modulus and the position of abnormal tissue with the model when a column contactor is pressed into the body. To confirm the validity of the method, we measured the Youngs modulus of silicone. The measurement results by the proposed method agreed with the value obtained with a parallel disk rotary rheometer. Moreover, our method gave accurate values for the Youngs modulus of the second layer of two-layered silicone and the distance from the surface to the second layer. These results confirmed that our method is capable of measuring the Youngs modulus of the soft materials and the boundary depth in two-layered objects.. |
| 20. | 久野翔太郎, 石川 諭, 雉本 信哉, 木庭洋介, 集中系モデルを用いた状態フィードバックに基づく能動騒音制御（音響機器を含む1次元音響空間のモデルベース制御）, 日本機械学会論文集, 10.1299/transjsme.14-00485, 81, 822, 14-00485-14-00485, 2015.02, We herein propose a new model-based control method, in place of traditional adaptive control, for a low-frequency noise problem in a closed space. The proposed control method is based on state feedback control and a model of the acoustic space obtained by the concentrated mass model. Thus, we can control noise in the entire space. According to the concentrated mass model, the acoustic space is modeled as masses, connecting linear springs, connecting dampers, and base support dampers. Furthermore, a loudspeaker, as a control source, is also modeled by a mass, a spring, and a damper. In the present paper, as a first step, we constructed a coupled analysis model of a one-dimensional acoustic space and the loudspeaker. We designed the model-based control system for the standing sound wave in the low-frequency band. Specifically, we realized a state feedback control system based on a Kalman filter and pole placement. Modal reduction using modal analysis is conducted to reduce the computation time of the controller. Then, we conducted experiments and a numerical simulation of the one-dimensional sound tube to confirm the validity of the analysis model. Moreover, we perform an experiment to control the noise in the sound tube. The noise is reduced around the resonance frequency in the entire space. Therefore, the proposed method is valid for noise control in a closed space.. |
| 21. | WANG Xun, KOBA Yosuke, ISHIKAWA Satoshi, KIJIMOTO Shinya, Hybrid active noise barrier with sound masking, Inter Noise 2014, 2014.11. |
| 22. | 王循, 木庭洋介, 石川 諭, 雉本 信哉, ハイブリッドANCシステムを用いた能動的遮音壁, 日本機械学会論文集C編, 10.1299/transjsme.2014dr0165, 80, 814, DR0165-DR0165, 2014.06, In this paper, in order to improve the low frequency noise insulation performance of a noise barrier, a new type of hybrid active noise control (ANC) system is proposed. The proposed system is a combination of feedforward and feedback controller. The reference signal for the feedforward controller is generated in the feedback part, so the reference microphone is not necessary. The feedback controller is used for controlling the acoustic boundary to insulate the diffraction noise, and the feedforward controller is used for reducing the noise at the error microphone which is set to be near the ears of people. As a preliminary work, this paper validated the effectiveness of the proposed ANC system both by simulations and by an experiment. The result shows that the active noise insulation provided by feedback controller and the noise attenuation provided by feedforward controller accumulated in the control area, so that the proposed ANC system has better control performance than individual feedforward or feedback ANC system.. |
| 23. | ISHIKAWA Satoshi, KIJIMOTO Shinya, KOBA Yosuke, OWAKI Ryoma, MORI Yuki, Two-Dimensional Acoustic Analysis by Concentrated Mass Model, Inter Noise 2013, Paper No. 1116, 2013.09. |
| 24. | SUGIKI Shohei, ISHIKAWA Satoshi, KIJIMOTO Shinya, KOBA Yosuke, Simulation of Speech Production by Concentrated Mass Model, Inter Noise 2013, Paper No. 1122, 2013.09. |
| 25. | 石川 諭, 雉本 信哉, 木庭洋介, 大脇 亮磨, 森 裕樹, 集中系モデルによる2次元音響解析, 日本機械学会論文集B編, 10.1299/kikaib.79.744, 79, 801, 744-748, 2013.05, FDTD method and CIP method are used for an acoustic analysis in time domain. However, these methods do not take into account a sound attenuation from viscosity. In our study, we propose a concentrated mass model which consists of spring-mass-damper system to perform a two-dimensional acoustic analysis. The dampers of this model consider viscosity of air. In this paper, we derive mass, connecting springs, and connecting dampers. The characteristic of connecting spring is derived from the condition of adiabatic change of air, and the connecting damper is derived from the normal stress. To confirm the validity of the proposed model, the numerical results obtained by the concentrated mass model are compared with the theoretical value of a traveling wave, and with the theoretical value of the natural frequency. All numerical computational results agree very well with the theoretical values. Therefore, it is concluded that the proposed model is valid for the two-dimensional acoustic analysis.. |
| 26. | Yasuhiro Shimada, ISHIKAWA Satoshi, Shinya Kijimoto, DEVELOPMENT IN MEASUREMENT METHOD AND ANALYSIS MODEL OF LIVING BODY, MJIIT-JUC Joint Symposium 2012, 2012.11. |
| 27. | Yoshiko Ohno, Yosuke Koba, ISHIKAWA Satoshi, Shinya Kijimoto, ACTIVE NOISE CONTROL FOR A MOVING EVALUATION POINT USING STEPSIZE VECTOR AND SECONDARY PATH INTERPOLATION, MJIIT-JUC Joint Symposium 2012, 2012.11. |
| 28. | 大野佳子, 池田生馬, 木庭洋介, 松田 浩一, 雉本 信哉, ステップサイズベクトルを用いた評価点移動時の能動音響制御, 日本機械学会論文集C編, 10.1299/kikaic.78.1670, 78, 789, 1670-1679, 2012.05, In three-dimension acoustic field, it is difficult to control in the whole room using active noise control (ANC) technique. Instead, around-head-control is investigated in this paper. By using around-head-control method, an object person can get the noise reduction effect without controlling in the whole space, because it makes around the head quiet locally. Therefore, to realize around-head-control, it is necessary for a controller to follow the head movement. However, there is a problem that the control effect under the movement is worse, and the recovery of control effect after movement is slow by conventional ANC. Against this problem, we propose the new method of improving the adaptation speed when an evaluation point moves. In the algorithm, the updating size appropriate to each coefficient of the adaptive filter is calculated by using a step size vector. The step size vector is calculated from the coefficient of adaptive filter before updating. The validity of the proposal method is shown by the numerical simulation and the experiment in an anechoic chamber.. |
| 29. | 嘉村俊一, 木庭洋介, 松田 浩一, 雉本 信哉, 周波数領域適応アルゴリズムを用いた衝撃音の能動制御, 日本機械学会論文集C編, 10.1299/kikaic.78.1655, 78, 789, 1655-1662, 2012.05, Noise control has been developed to establish the comfortable soundscape even if our house life. Floor impact noise such as the sound of footsteps or falling object becomes a problem in an apartment house. Floor impact noise has a peak at the low-frequency range. Passive noise control is not effective against low-frequency noise. Therefore, the purpose of this paper is to control the impact noise using active noise control. Since each impact noise is generated in a short period, LMS algorithm is difficult to use because of its slow convergence characteristics. On the other hand, frequency domain adaptive algorithm is known for fast convergence characteristics. In this paper, the effectiveness of active noise control using frequency domain adaptive algorithm is confirmed through simulations and experiments.. |
| 30. | Xun WANG, Shinya KIJIMOTO, Yosuke KOBA and Koichi MATSUDA, Noise Barrier Using Feedback Active Noise Control, The 40th International Congress and Exposition on Noise Control Engineering (INTER-NOISE 2011), TS-6, SS33, 2011.09. |
| 31. | 池田生馬, 雉本信哉, 松田浩一, 空間の音響モード特性を考慮した広帯域能動的音響制御, 日本機械学会論文集C編, 76, 765, 1265-1270, 2010.05. |
| 32. | Koichi MATSUDA and Shinya KIJIMOTO, Reaction Disturbance Cancellation for a Magnetically Levitated Ladder Arm of Clean-Room Robot, Proc. of the 36th Annual Conference of the IEEE Industrial Electronics Society, pp. 1590-1596, 2010., pp. 1590-1596, 2010., 2010.01. |
| 33. | Koichi MATSUDA and Shinya KIJIMOTO, Reaction Disturbance Cancellation for a Magnetically Levitated Ladder Arm of Clean-Room Robot, Proc. of the 36th Annual Conference of the IEEE Industrial Electronics Society, pp. 1590-1596, 2010., pp. 1590-1596, 2010., 2010.01. |
| 34. | 池田生馬, 雉本信哉, 松田浩一, 木庭洋介, 景山慶太郎, 評価点の位置情報を利用した3 次元能動的音響制御, 日本機械学会論文集C編, 75, 753, 1421--1427, 2009.05. |
| 35. | Ikuma IKEDA, Shinya KIJIMOTO, Koichi MATSUDA, Yosuke KOBA and Keitaro KAGEYAMA, Active Noise Control Using Position of Evaluation Point, Journal of System Design and Dynamics, 4, 753, 1421--1427, Special Issue on D&D2008, Paper No. T2-08-0860, 2009.05. |
| 36. | 大窪貴宏, 雉本信哉, 松田浩一, 木庭洋介, 音響信号を利用した水素漏洩検出法, 日本機械学会論文集, C編，75巻，752号，pp.912 - 918, 2009.04. |
| 37. | 景山慶太郎, 雉本信哉, 松田浩一, 木庭洋介, 池田生馬, 衝撃音の能動音響制御, 日本機械学会論文集, C編，74巻，748号，pp.2904 - 2909, 2008.12. |
| 38. | Ikuma IKEDA, Shinya KIJIMOTO, Koichi MATSUDA, Yosuke KOBA and Toshihiko HIGASHI, Active Noise Control Assuming Quiet Zone Movement, Journal of System Design and Dynamics, Vol.2，No.6，pp.1296-1305，2008, 2008.12. |
| 39. | Koichi MATSUDA and Shinya KIJIMOTO, An Approach to Designing a Magnetic-Bearing System for Smaller Rotating Machines, Proceedings of the 2008 IEEE International Symposium on Industrial Electronics, pp.1419-1422, 2008, 2008.12. |
| 40. | 池田生馬, 雉本信哉, 松田浩一, 木庭洋介, 東周彦, 3次元空間における評価点の移動を考慮した能動的音響制御, 日本機械学会論文集C編, 74巻741号，pp.1273-1280, 2008.05. |
| 41. | 木庭洋介, 雉本信哉, 池田生馬, 松田浩一, 東周彦, ステップサイズ自動調整法を用いた能動的音響制御, 日本機械学会論文集C編,, 74巻741号,pp.1281-1286, 2008.05. |
| 42. | Ikuma IKEDA, Shinya KIJIMOTO, Koichi MATSUDA and Yosuke KOBA, Active Noise Control with a Moving Evaluation Point, Journal of System Design and Dynamics, Vol.2，No.1，pp.362-369，2008, 2008.03. |
| 43. | Koichi MATSUDA, Yoichi KANEMITSU, and Shinya KIJIMOTO, Optimal Number of Stator Poles for Compact Active Radial Magnetic Bearings, IEEE Transactions on Magnetics,, Vol. 43, No. 8, 2007, pp. 3420-3427, 2007.08. |
| 44. | 祖父江寿紘, 金光陽一, 雉本信哉, 松田浩一, 木庭洋介, 磁気浮上非接触ロボットの開発（回転と直動の浮上・移動制御）, 日本AEM学会誌, Vol.15, No. 2,pp.183-188, 2007.06. |
| 45. | 雉本 信哉 木庭 洋介 金光 陽一 松田 浩一, 空間音響特性の変化を利用する水素検出手法（実現可能性の検討）, 日本音響学会誌, 63巻，5号，pp.245-250, 2007.05. |
| 46. | Shinya Kijimoto, Yuichi SASAKI, Yoichi KANEMITSU, Koichi MATSUDA, Takashi YOSHIDA, Active Noise Control for Three-Dimensional Sound Field Using Fast Converging Algorithms, Journal of Environment and Engineering, vol.2, No.2, pp.257-265, 2007.03. |
| 47. | Koichi Matsuda, Shinya Kijimoto and Yoichi Kanemitsu, Stability-Optimized Clearance Configuration of Fuluid-Film Bearings, Transactions of the ASME, Journal of Tribology, 129, 1, pp.106-111, 2007.01. |
| 48. | 雉本信哉, 佐々木優一, 金光陽一, 松田浩一, 吉田敬, 高速に収束するアルゴリズムを用いた３次元の能動的音響制御, 日本機械学会論文集 (C編), 71, 707, pp.2141-2146, 2005.07. |
| 49. | 朴泰? 金光陽一, 雉本信哉, 松田浩一, 磁気軸受支持回転体の不つりあいとセンサーランナウトの同定（第２報 重み付き逐次最小法を適用した同定法と実験）, 日本機械学会論文集C編, 70, 691, pp.656-663, 2004.03. |
| 50. | Koichi MATSUDA, Yoichi KANEMITSU, Shinya KIJIMOTO, Optical Clearance Configuration of Fluid-Film Journal Bearings for Stability Improvement, Transactions of the ASME, Journal of Tribology, 126, pp.125-131, 2004.01. |
| 51. | 雉本信哉, 鈴木英男, 金光陽一, 松田浩一, マイクロホンプローブの実効受音位置, 日本音響学会誌, 第57 巻， 第8 号，pp. 502--508, 2001.08. |
| 52. | 雉本信哉, 田中英雄, 金光陽一, 松田浩一, 2音源を用いた能動的音響制御のためのハウリング抑制手法, 日本機械学会論文集(C編), 67, 656, pp. 948- 953, 2001.04. |
| 53. | 金光陽一, 雉本信哉, 松田浩一, 匹田竜馬, 丸井英史, テーパ付き圧力ダム軸受の動特性, 日本機械学会論文集（C編）, 66, 642, pp.24-28, 2000.01. |
| 54. | 朴泰?, 金光陽一, 雉本信哉, 松田浩一, 磁気軸受支持回転体の不つり合いとセンサーランナウトの同定, 日本機械学会論文集（C編）, 66, 652, 3925-3931, 2000.01. |
| 55. | Shinya KIJIMOTO, Hideo SUZUKI and Shun OGURO, Diffraction of Sound by Two Finite-Length Cascade Cylinders, The Journal of Acoustical Society of Japan(E), 19, 4, pp. 269- 273, 1998.01. |
| 56. | 雉本信哉, 下嶋浩, 柴原章宏, 能動的音響制御のための周波数領域適応アルゴリズム, 第２報，ダクトモデルによる実験的検討, 日本機械学会論文集(C), 62, 596, pp.1397-1402, 1996.04. |
| 57. | 雉本信哉, 下嶋浩, 能動的音響制御のための周波数領域適応アルゴリズム 第1報，アルゴリズムの提案およびシミュレーション, 日本機械学会論文集(C編), 61, 589, pp.3581-3586, 1995.01. |
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