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Matsubara, Masami

Affiliation Department of Mechanical Engineering
Title Associate Professor
Fields of Research Mechanical dynamics / vibration dynamics
Academic Societies The Japan Society of Mechanical Engineers / Society of Automotive Engineers of Japan, Inc / The Society of Rubber Science and Technology, Japan
E-mail matsubara@me
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Researcher information URL(researchmap) Researcher information


My research focuses on vibration behavior for machine structure. Especially, I stick to the research method of deriving frequency equation.
Now, the subjects of my study are
(A) Vibration behavior analysis of rotating body
(B) Study of dynamic design for machine structure

Theme1:Dynamic analysis of tire

Tire vibaration model

We do a research of vibration anaysis for tires. tire is a high damping structure and an important automotive's parts. Vibaration behavior of a tire is really complex because it becomes deformed by road contact and rolling. In this study, we suggest a tire model that has small number of degrees of freedom and a new approach for tire vibration analysis.


Vibaraon, dynamics model, analytical dynamics, shell

Theme2:Study of dynamic design for machine structure

Beam constraint model

This study is a development of a new dynamic design method for machine structure focused on damping characteristics and condition of constraint. For reduction of noise and vibration, we often redesign the dynamic chracteristics. In that case, it is important how to decide design factors in sub-structure as transfer path of vibration. We suggest a new approach using receptance method which enabled us to understand optimized design by using intuition.


Vibration, dynamics model, analytical dynamics, Numerical computing

Theme3:Study of damping characteristics of rubber

Cellulose particles

Natural rubber (NR), which is both a biomass and viscoelastic material, has excellent dynamic characteristics. It is useful for packing and attenuation material. However, NR has lower damping characteristics than synthetic rubbers such as butyl rubber. Therefore, it is necessary to improve the dynamic characteristics of NR for damping. In this study, we developed attenuation materials based on NR and cellulose composites. Damping characteristics were evaluated from vibration tests with a damping beam using NR/cellulose composites. Tests revealed the effect of particle shapes, compounding ratio, and orientation distribution on damping characteristics.


Natural rubber, Attenuation material, Damping beam, Cellulose particle

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