本文主要应用CATIA软件对汽车发动机曲轴进行三维建模，并利用CATIA中的分析模块对曲轴进行了模态分析，得到了发动机曲轴的各阶固有振动频率及相应的振型。将分析结果与发动机的工作频率进行比较分析，结果表明：该曲轴结构设计避开共振区。%3D modeling of crankshaft is established basically using CATIA software in this paper. The modal analysis is also conducted through the CATIA software. Then, the natural vibration frequency and the corresponding vibration mode of each order of crankshaft are gained. The result is compared to the force of the engine. It is shown that the structure of shaft is out of the sympathetic vibration area.
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