Research on the influence of under-chassis equipment parameters and distribution on car body vibration of high-speed railway vehicle

Abstract

Under-chassis equipment for a high-speed railway vehicle contributes significantly to the vibration response characteristics of the car body. To study the influence pattern of the under-chassis equipment parameters and position distributions on the vibration response of a car body, a rigid-flexible coupling dynamics model of a high-speed railway vehicle is established. The impact of the suspension frequency and mass of the equipment on the vibration of the car body is analyzed. Subsequently, the influence of the equipment placement on the vibration characteristics of the vehicle body is investigated. Furthermore, the study found that the response from a single point cannot represent the vibration performance of the entire vehicle body when adjusting the equipment distribution. To address this challenge, an upper envelope of multiple response points is proposed as an evaluation index. The envelope is applied to study the combined influence of the equipment mass, suspension frequency, and equipment location distribution on the vibration response. The results indicate the effect pattern of equipment suspension frequency, mass, and location arrangement on vehicle body vibration, as well as their combined influence. A suitable parameter and distribution matching relationship is provided by the results to reduce car body vibrations.