高周波帯域の三次元変形に着目した鉄道の車体弾性振動モード解析手法の検討

抄録

It is essential to investigate the vibration characteristics of the railway vehicle carbodies in order to improve the ride comfort of passengers. In the previous studies, the focus has been on the natural modes of the carbodies whose natural frequencies are up to 15-20Hz, because the passengers are sensitive to the vibration around such a frequency range. On the other hand, it is getting noticed that the vibration reduction for high-frequency is also important, especially for high-speed railways. The authors therefore have been tackling to estimate the vibration modes consisting of the natural frequencies up to 30-40Hz. In this study, the tested vehicle is excited by a shaker and the vibration accelerations in 3 directions are measured on the ceiling and the Žoor of the carbody with the much and denser sensors than heretofore. The two kinds of experimental modal analysis methods are then applied to estimate the modal parameters such as the natural frequencies,modal damping ratios, and vibration shapes.