4105型柴油机曲轴计算模态与试验模态的振型相关性

为获得4105型柴油机曲轴振动特性，并验证有限元计算是否正确，对4105柴油机曲轴分别进行了有限元计算和试验模态分析，获得了相应的振动频率和振型，并对所获得各阶振型的内积相关度进行了计算分析。结果表明，计算模型与试验模型的各阶振型的内积相关度均大于0.7，具有较高的吻合度，验证了有限元模型的有效性。振型图对比发现曲轴振动最大变形位置多集中在曲轴两端。振型相关性分析对比确定了曲轴固有振动特性，为利用曲轴有限元模型进行曲轴优化设计、减振等工作提供了依据。

Model correlation between calculated and experimental mode of 4105 diesel engine crankshaft

Finite elements mode and experimental mode of 4105 diesel engine crankshaft were analyzed respectively in order to get the vibration characteristics of 4105 engine crankshaft and verify the correctness of finite element model. The corresponding vibration frequencies and models were obtained. The inner product correlation degrees between the two kinds of model were calculated and the vibration mode were compared. The results showed that the inner products correlation degree between the calculated mode and the experimental mode was a high correlation, with coefficient of 0.7, which verified the effectiveness of the finite element model. The comparison between the finite element mode and the experimental mode showed that the maximum deformation mostly occurred at the end of the crankshaft. The research on mode correlation confirmed the natural vibration characteristics of crankshaft, and can provide a reference for crankshaft design optimization and vibration reduction by crankshaft finite element.