某平推式桥梁展开工况下模态分析与试验研究  

Modal Analysis and Experimental Study of a Flat‑Pushed Bridge Under Unfolding Condition

作　　者：时运来[1] 吴文博 邵飞 段应昌 高磊 申玫 SHI Yunlai;WU Wenbo;SHAO Fei;DUAN Yingchang;GAO Lei;SHEN Mei(State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics and AstronauticsNanjing,210016,China;Field Engineering Institute,Army Engineering University of PLA Nanjing,210007,China)

机构地区：[1]南京航空航天大学机械结构力学及控制国家重点实验室,南京210016 [2]中国人民解放军陆军工程大学野战工程学院,南京210007

出　　处：《振动．测试与诊断》2024年第3期474-479,617,共7页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金资助项目(51975282);“十三五”装备预研资助项目(30110010403)。

摘　　要：为了研究桥梁架设中的振动问题,以一种平推式桥为研究对象,针对桥架设过程中最危险的展开桥工况,建立了展开桥的柔性多体动力学模型,并进行了模态计算和试验研究。结果表明:1阶振动的计算值为0.5447 Hz,实测值为0.5072 Hz,振型为横向弯曲,试验结果与模态计算值接近,最大误差为6.8%,验证了有限元模型的准确性;在展开桥工况下,结构自振频率梯度明显,识别度高。In order to study the vibration problem of bridge erection,a flexible multi-body dynamic model of a flat-pushed bridge is established and the modal analysis and experimental research are carried out according to the most dangerous operating condition of the bridge during the bridge erection.The results show that the simulation value of first-order vibration is 0.5447 Hz,the experimental value is 0.5072 Hz,and the vibration mode is transverse bending.The experimental results are close to the simulation values,and the maximum error is 6.8%,which verifies the accuracy of the finite element model.Under the condition of unfolded bridge,the natural vibration frequency gradient of the structure is obvious and the recognition degree is high.

关 键 词：架桥车 平推式 工况 模态分析 

分 类 号：TH113.1[机械工程—机械设计及理论]