基于频响函数的转向架构架模态匹配研究

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中图分类号：U270 文献标志码：A文章编号：1006-0316（2025）06-0047-08

doi：10.3969/j.issn.1006-0316.2025.06.007

Research on Modal Matching of Bogie Frame Based on Frequency Response Function

ZHENG Yuhao1，2.3， ZHOU Qiang1，2，HE Chao1²，WU Xingwen³，LIU Kaicheng1，4

（1.Nuclear Power Institute of China， Chengdu 610213， China; 2.Chengdu Hezong Nuclear Power Engineering Co.，Ltd.， Chengdu 610213， China; 3.School of Mechanical Engineering，Southwest Jiaotong University， Chengdu 610031， China; 4. State Key Laboratory of Rail Transit Vehicle System， Southwest Jiaotong University， Chengdu 610031， China）

Abstract ： Atthe beginning of the design of the bogie frame，the key to solve the resonant fatigue problem is to accurately studythe dynamic characteristics of the structure throughthe vibration transmission mechanism of the structure，and to identifytheresonance modes that the structure is easily excited. In this paper，therigid-flexible coupling dynamics modelof vehicle system is established.Then the key position of the frame is identified based on the sweeping frequency method，and the time-frequencyanalysis is performedon the dynamic stress atthe key position.Finally，basedon the frequency response function of the multi-input and multi-output system， the modal matching of the frame is studied，and the influence of structural damping ratio on the vibration characteristics of the frame is analyzed.The results show that the frame is prone to modal resonance within the frequency band of 40～90Hz under the floating and sinking excitation mode， and the damping ratio has little effect on the vibration transmission of the frame; within the frequency band of 105～125Hz ，the frame is sensitive to the modes of the side beam in the same vertical bend and the opposite transverse bend，and the increase of damping ratio has obvious attenuation effect on the vibration transmission of the frame.

Key words ：bogie frame irigid flexible coupling dynamic model imodal matching ;MIMO ;frequency response function

车辆服役过程中，随着运行线路的恶化，轮轨间极易出现短波不平顺，导致产生轮轨高频激励，进而引发车辆结构的共振疲劳问题。（剩余5148字）