Abstract
A passenger railway vehicle’s lightweight design is an efficient technique of reducing energy consumption and dynamic forces between wheel and rail. However, light design results in resonant vibration in a car body. To restrain resonant vibration, a correlation between the suspended equipment variables and the car body’s modal frequency was investigated in this paper. A rigid–flexible general model was developed to examine the impacts of different equipment suspended under the chassis based on mass, location, and frequency on the car body mode. In addition, the numerical model is validated through the experimental result in terms of ride quality. The results demonstrate that the underframe equipment’s suspension characteristics have a significant impact on the mode of the car body, particularly the frequency of the first bending mode. Equipment with a considerable mass should be suspended near the center of the car body to optimize the frequency of the car body’s high-frequency bending. The weight of the equipment has a significant impact on the car body’s first bending frequency. The frequency of heavy equipment should be low enough to promote high-frequency transmissibility and improve the vibration characteristics of the car body.
Highlights
It was found that the car body (CB) vibration is more inflexible movement compared to rigid movement
The CB equations of motion are given in Equations (6)–(9) and the force acting on the CB from the suspension equipment is regarded as dynamic vibration absorber (DVA) and derived for each piece of suspended equipment given in Equation
A generalized railway vehicle model is built to study the coupled viIn this paper, a generalized railway vehicle model is built to study the coupled vibrabrations between a flexible CB and its CBSE
Summary
With the rapid progress of high-speed rail vehicle technology, train operating speed is increasing while weight is decreasing to conserve energy. Gong et al [29] investigated the effect of the underframe suspended equipment on the CB flexible vibration by analyzing the relationship between the geometric filtering effect and the resonance frequency, and proposed an optimized dynamic vibration absorber (DVA) to reduce the resonance. The modal vibration can be reduced effectively by a suspended equipment with reasonably optimized suspension parameters, which works as a DVA. Both numerical analyses and field tests on a rig and on track verified that [22]. The coupled vibrations between a flexible CB and its CB suspended equipment are studied by employing multi-body dynamics of a railway vehicle system, and the CB suspension parameters are analyzed. The chassis based on mass, location, and frequency on the CB mode
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