Mechanical Dynamics Laboratory

T.Yamazaki

Toru Yamazaki
(Professor)

Office: 23-510 Ext.: 3758

e-mail:  toru@kanagawa-u.ac.jp

12/1997, Ph.D., The University of Tokyo

03/1995, M.S., The University of Tokyo

H.Nakamura

Hiroki Nakamura
(Assistant Professor)

Laboratory: 23-502 Ext.: 3751

e-mail:  hiroki-nak@kanagawa-u.ac.jp

09/2013, Ph.D., The University of Tokyo

03/2010, M.S., The University of Tokyo

Research Field

Mechanical Dynamics, Mechanical Vibration, Acoustics

Research Overview

For development of design procedure for quiet machine, modelling and analysis method of mechanical noise and vibration problems have been studied. Also, structure of musical instruments are investigated to derive an idea of vibration propagation structure.

Research Subjects

  • 1.Modelling and prediction of mechanical noise and vibration based on Statistical Energy Analysis (SEA) and Structural Intensity (SI); Development of conceptual design procedure for structure-borne sound.
  • 2.Scientific analysis of musical instruments and design of low noise structure for mechanical systems.
  • 3.Development of Analysis Method using signal processing for non-linear vibration of musical instruments and for diagnoses of machine and human.

Introduction:

Vibration power flow for low noise and vibration is vortex-typed (Fig.1). The comparison of power flows between two violins gives the effective knowledge for low vibration transmission using the bridge structure (Fig.2). Time-frequency analysis is used to identify the vibration model of real machine (Fig.3).

Publications
  • 1)T.Yamazaki, Y.Komukai, H.Nakamura, “Vibration Reduction on Panel Structure with Line Connections by Considering Vibration Energy Flow,” Transactions of Society of Automotive Engineers of Japan, Vol.47, No.1 pp.159-164 (2016).
  • 2)T.Yamazaki, T.Horiuchi, S.Suda, H.Nakamura, “Reduction of Transmitted Power on a Plane by Using Mode Pair Cancellation,” Transactions of Society of Automotive Engineers of Japan, Vol.46, No.3 pp.775-780 (2015).
  • 3)Y.Itoh, T.Imazu, H.Nakamura, T.Yamazaki, “Time-Frequency Analysis with Digital Filter for Nonlinear System Characterization in Mechanical Vibrations,” Proc. of The 22th International Congress on Soound and Vibration, 1009.pdf (2015)
  • 4)H.Nakamura, T.Yamazaki, S.A.A.Aziz, “Estimation of Road Profile from Steering Vibration Using ICA,” Proc. of The 22th International Congress on Sound and Vibration, 963.pdf (2015)
  • 5)T.Yamazaki, H.Nakamura, “Passive Control of Structural Intensity on A Flat Panel by Beam Attachment,” Proc. of The 22th International Congress on Sound and Vibration, 940.pdf (2015)
Affiliated Academic Organizations

T. Yamazaki:
Society of Automotive Engineers of Japan, Japan Society of Mechanical Engineers,Acoustical Society of Japan, Institute of Noise Control Engineering of Japan, Japan Fluid Power System Society, Japan Society of Civil Engineers, Institute on Noise and Vibration Technology for Next Generation

H. Nakamura:
Society of Automotive Engineers of Japan, Japan Society of Mechanical Engineers, Acoustical Society of Japan,

Current members
◯ Professors: 1 ◯ Assistant Professors: 1 ◯ Visiting Professors: 2
◯ Postgraduates: 5 ◯ Undergraduates: 14

Facilities:Analyzers and sensors for Sound and Vibration Measurement, Anechoic Chamber, Enviromental Test Chamber Enviromental Test Chamber

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