电动自行车主车架模态特性分析及灵敏度研究

Study on Mode Performance and Sensitivity of Main Frame of Electric Bicycle

为探讨电动自行车主车架的动态性能,对某全悬架电动自行车的主车架结构进行了弹性模态特性分析.应用ANSYA软件建立了主车架结构的有限元模型,分析了车架的模态频率和振型.结果表明有限元计算结果与实验测试结果相符.结合该车架的振动特性,应用模态灵敏度分析技术,研究了车架各部分结构的壁厚参数对电动自行车第一阶模态频率的影响关系,通过改变车架不同构件的壁厚可使车身具有较合理的动态特性.为电动自行车进一步的动力学分析提供了理论依据.

In order to study the dynamic performance of main frame of electric bicycle, it is analyzed that the modal behaviour of the main frame of an electric bicycle with complete suspension. The finite element model of the main frame is built by using ANSYS software, and the modal frequencies and vibration types are analyzed. The FEA results are in accordance with those obtained from experiments. By using the modal sensitivity analysis technology, as well as taking the vehicle vibration characteristics into account, the relationship between the thickness of each component of the main frame and the first-order modal frequency is investigated. The results show that the vibration performances of main frame can get better with the optimization of component thickness parameters. It provides a theoretical basis for the dynamic analysis of electric bicycle.