鉄道の車体弾性振動を低減する多軸動吸振器の開発

（デバイスの試作とその特性評価）

抄録

Flexural vibrations of railway vehicle car bodies around 10 Hz negatively affect ride comfort because humans are sensitive to this frequency range. Therefore, these vibrations should be reduced to improve ride comfort. The purpose of this study is to develop a new vibration reduction device which can reduce flexural vibrations of railway vehicle car bodies. In this study, we designed and developed a multi-axis dynamic vibration absorber (called MADVA in this report), which consists of a mass, a housing, presser plates, and elastic materials. Multiple pairs of oppositely directed elastic materials are connected between the mass and the housing, and the mass and the presser plates to permit the mass to move along primary axes. The multidirectional motion of the mass is expected to reduce three-dimensional flexural vibrations. The MADVA has a frequency adjustment mechanism for application to various types of car bodies which have different natural frequencies. We conducted some excitation tests of the MADVA to evaluate its characteristics and confirmed that its vertical and lateral peak frequencies can be adjusted to dampen the 10 Hz range. Furthermore, we built a numerical model of the MADVA for finite element method (FEM) simulation and predicted the vibration reduction effect on a Shinkansen-type test vehicle.