|ISHIKAWA Satoshi||Last modified date：2018.01.10|
Associate Professor / Dynamics of Mechanical Systems / Department of Mechanical Engineering / Faculty of Engineering
|ISHIKAWA Satoshi||Last modified date：2018.01.10|
|1.||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, 1-13, 2017.12.|
|2.||Active noise control for two dimensional acoustic space by concentrated mass model.|
|3.||Wang Xun, Yosuke KOBA, Satoshi ISHIKAWA, Shinya Kijimoto, Hybrid actice noise barrier with sound masking in open-plan offices, Noise Control Engineering Journal, 64, 3, 403-415, 2016.05, 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..|
|4.||Sloshing phenomenon analysis by using concentrated mass model
(1st Report, Proposition of linear analytical model for small amplitude wave and free vibration analysis).
|5.||Modeling of magnetic damper composed of ring magnet and coaxially and relatively moving conducting disk considering skin effect.|
|6.||Coupled analysis of two-dimensional acoustic and membrane vibration by concentrated mass model.|
|7.||Noise barrier using hybrid ANC system
(Proposal and application of an adaptive robust feedback ANC system).
|8.||Satoshi ISHIKAWA, Takahiro KONDOU, Kenichiro MATSUZAKI, Satoshi YAMAMURA, Analysis of nonlinear shallow water waves in a tank by concentrated mass model, Journal of Sound and Vibration, 371, 171-182, 2016.03, The sloshing of liquid in a tank is an important engineering problem. For example, liquid storage tanks in industrial facilities can be damaged by earthquakes, and conversely liquid tanks, called tuned liquid damper, are often used as passive mechanical dampers. The water depth is less often than the horizontal length of the tank. In this case, shallow water wave theory can be applied, and the results indicate that the surface waveform in a shallow excited tank exhibits complex behavior caused by nonlinearity and dispersion of the liquid. This study aims to establish a practical analytical model for this phenomenon. A model is proposed that consists of masses, connecting nonlinear springs, connecting dampers, base support dampers, and base support springs. The characteristics of the connecting nonlinear springs are derived from the static and dynamic pressures. The advantages of the proposed model are that nonlinear dispersion is considered and that the problem of non-uniform water depth can be addressed. To confirm the validity of the model, numerical results obtained from the model are compared with theoretical values of the natural frequencies of rectangular and triangular tanks. Numerical results are also compared with experimental results for a rectangular tank. All computational results agree well with the theoretical and experimental results. Therefore, it is concluded that the proposed model is valid for the numerical analysis of nonlinear shallow water wave problems..|
|9.||Wang Xun, Yosuke KOBA, Satoshi ISHIKAWA, Shinya Kijimoto, An adaptive method for designing a robust IMC structured feedback active noise controller , Noise Control Engineering Journal, 63, 6, 496-507, 2015.11, 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. .|
|10.||Noise barrier using hybrid ANC system.|
|11.||Development of measurement technique of living body flexibility by indentation test using concentrated mass model.|
|12.||Active noise control based on state feedback by concentrated mass model
(Model based control for one-dimensional acoustic space and loudspeaker).
|13.||Analysis of pressure wave in gas-liquid two-phase flows by concentrated mass model.|
|14.||A noise barrier using hybrid ANC system.|
|15.||Analysis of Pulse Wave in Blood Vessel by Concentrated Mass Model.|
|16.||Two-Dimensional Acoustic Analysis by Concentrated Mass Model.|
|17.||Active Noise Control for a Moving Evaluation Point Using Stepsize Vector and Interpolation of Secondary Path.|
|18.||Nonlinear Shallow Water Wave Analysis by Concentrated Mass Model.|
|19.||Satoshi ISHIKAWA, Takahiro KONDOU, Kenichiro MATSUZAKI, and Shota NAGANO, Nonlinear Pressure Wave Analysis by Concentrated Mass Model
(4th Report, Modeling of Elastic Pipe Element), Journal of System Design and Dynamics, 5, 6, 1388-1401, 2011.09.
|20.||Nonlinear Pressure Wave Analysis by Concentrated Mass Model.|
|21.||Satoshi ISHIKAWA, Takahiro KONDOU and Kenichiro MATSUZAKI, Nonlinear Pressure Wave Analysis by Concentrated Mass Model
(3rd Report, Modeling of Enlargement and Contraction Element), Journal of System Design and Dynamics, 5, 1, 204-218, 2011.01.
|22.||Satoshi ISHIKAWA, Takahiro KONDOU and Kenichiro MATSUZAKI, Nonlinear Pressure Wave Analysis by Concentrated Mass Model
(2nd Report, Modeling and Validity Verification of Branch Element), Journal of System Design and Dynamics, 4, 4, 646-659, 2010.08.
|23.||Nonlinear Pressure Wave Analysis by Concentrated Mass Model.|
|24.||Nonlinear Pressure Wave Analysis by Concentrated Mass Model.|
|25.||Satoshi ISHIKAWA, Takahiro KONDOU and Kenichiro MATSUZAKI, Nonlinear Pressure Wave Analysis by Concentrated Mass Model
(1st Report, Suggestion and Validity Verification of Analytic Model), Journal of System Design and Dynamics, 3, 5, 827-840, 2009.10.
|26.||Nonlinear Pressure Wave Analysis by Concentrated Mass Model.|
|27.||Self-Synchronized Phenomena Generated in Pendulum-Type Oscillators : 1st Report, Analysis for Self-Synchronized Phenomena between Two Metronomes by Using Improved Shooting Method.|