架桥机结构动力学建模与动态特性分析

Dynamics Modeling for Structure of Bridge Erecting Machine and Analysis of Dynamic Characteristics

研究目的:通过合理简化和理论推导,建立架桥机典型工况的动力学模型,分析架桥机动态特性,为改善架桥机的动力学性能和结构优化设计提供理论依据,为开发动态性能优良、重量轻、成本低的架桥机提供服务。研究结论:在分析JQ900系列架桥机作业工序和有限元计算的基础上,针对架桥机作业过程中的危险工况,建立架桥机的动力学模型,通过用接触有限元法对轮胎支撑刚度的有限元计算模拟和能量法,简化动力学模型,得到了架桥机固有频率计算公式和相应的振型,并与有限元计算结果进行了比较,验证了动力学模型,为架桥机主梁结构的动态优化设计提供了理论依据。

Research purposes： A dynamic model for the typical operating conditions of the bridge erecting machine is established through rational simplification and theoretical derivation to analyze the dynamic characteristics of bridge erecting machine for the purposes of providing the theoretical basis to improve the dynamic performance,optimize the structure and offer the technical support for developing the bridge erecting machine with good dynamic performance,light weight and low-cost.Research conclusions：Based on the analysis of operating processes of JQ 900 series of bridge erecting machine with the finite element method,a dynamic model was established for the dangerous working condition of the bridge erecting machine.The dynamic model was simplified through the calculation and simulation of support stiffness of tire with the contact finite element method and energy method,and the calculation formula for natural frequency and corresponding vibrationl shape of bridge erecting machine were obtained.Compared with the calculated results of the finite element,the kinetic model was verified.The new formula and corresponding vibration shape provide a theoretical basis for the dynamic optimal design of the beam structure of the bridge erecting machine.