Numerical and Experimental Analysis of DVA on the Flexible-Rigid Rail Vehicle Carbody Resonant Vibration.

Sunil Kumar Sharma,Hong-Lae Jang,Rakesh Chandmal Sharma,Jaesun Lee

doi:10.3390/s22051922

Sunil Kumar Sharma, Hong-Lae Jang + Show 2 more

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https://doi.org/10.3390/s22051922

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Abstract

This paper examines the influence of the equipment considered as a DVA (Dynamic Vibration Absorber) upon the mode of vertical vibrations of the car body in high-speed vehicles. The car body is represented as an Euler-Bernoulli beam to minimize flexible vibration. The DVA approach is used to find the appropriate suspension frequencies for various types of equipment. A vertical mathematical model with a flexible car body and equipment is developed to investigate the effect of equipment mass, suspension stiffness, damping, and mounting location on car-body flexible vibrations. A three-dimensional, rigid-flexible coupled vehicle system dynamics model is developed to simulate the car body and equipment’s response to track irregularities. The experimental result was considered to verify the theoretical analysis and dynamic simulation. The mathematical analysis demonstrates that the DVA theory can be used to design the suspension parameters of the equipment and that it is suitable and effective in reducing the flexible vibration of the car body in which the vertical bending mode is greatly affected. Heavy equipment should be mounted as close to the car body’s center as possible to achieve significant flexible vibration reduction, whereas light equipment contributes very little flexible vibration reduction.

Highlights

The vehicle vibrations due to track irregularities are considered when the vehicle ride quality is investigated
This paper presented a rigid-flexible 3D rail vehicle model that analyzed the impacts of different equipment suspended under the chassis based on the car body (CB) mode’s mass, location, and frequency
The proposed model was applied to study the effects of car body flexibility on the dynamic performances of a rail vehicle

Summary

Introduction

The vehicle vibrations due to track irregularities are considered when the vehicle ride quality is investigated. The track vibrations reach the car body (CB) due to irregularity inputs via rail wheel interaction, primary suspension system, and secondary suspension system. With the fast progress of high-speed rail vehicle technology, train operating speed increases while weight decreases to conserve energy. The high running speed expands the rail vehicle vibration frequency range, and the light structure allows the flexible modes to be more triggered by wheel/rail interaction [1]. It was found that the CB vibration is a more flexible movement compared to rigid movement. To create innovative technologies to enhance the dynamic response of rail vehicles at higher speeds, there is a necessity to understand the function of CB flexibility [2]

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