Modal characteristics analysis for car body of high-speed electric multiple units

Abstract

Aiming at the problems that track irregularity and equipment operation cause complex vibration during high-speed train operation, reduce ride comfort, and affect operation safety, the modal characteristics of the vehicle body were analyzed to improve the dynamic response characteristics of the vehicle. The finite element model of the high-speed train body was established to calculate the vibration modes of the body under different mass conditions. The influence of the hanging position and hanging number of equipment under the vehicle on the modal frequency of the vehicle body was analyzed, and the variation law of modal frequency and vibration mode was obtained. Based on finite element calculation, built the vehicle body modal test system, carried out modal tests on the vehicle body, analyzed the differences and reasons between simulation and test results, and verify the correctness of numerical calculation and finite element model. The results show that the modal frequency of the car body met the relevant design standards, and the variation trend of low-order modal modes of the car body with different mass was the same. The hanging position had an obvious influence on the vertical bending of the underframe and the torsional vibration frequency of the car body. The modal frequency of the car body increased with the increase of the number of hanging points of equipment under the vehicle.