轻型客车复合材料板簧模态的预测和分析

Prediction and analysis for the modal of a composite leaf spring in a light bus

为了预测某轻型客车复合材料板簧的模态并预判复合材料板簧的模态是否会与相关激励耦合发生共振,在ABAQUS软件中建立了针对复合材料板簧模态计算问题的有限元模型。对复合材料板簧的有限元模型进行了计算模态分析,根据计算模态分析结果预测了复合材料板簧的模态。对复合材料板簧的样件进行了试验模态分析,通过对比模态预测结果和试验模态分析结果的方法验证了模态预测结果的准确性和有限元模型的正确性。根据复合材料板簧的模态分析结果,设计的复合材料板簧能够避免共振现象的发生。利用经过验证的复合材料板簧有限元模型分析了各设计变量与复合材料板簧一阶模态频率之间的关系。分析结果表明,选用0°铺层角度、较低密度的复合材料和较高的纤维体积含量能够降低复合材料板簧发生共振的可能性。得到的研究结果可显著降低复合材料板簧的研发风险和成本。

In order to predict the modal of a composite leaf spring in a light bus and determine if the resonances among the modal of the composite leaf spring and the excitations will occur or not,the finite element model for the modal analysis of the composite leaf spring was established by using ABAQUS software. The computational modal analysis for the finite element model was carried out and the modal of the composite leaf spring was predicted according to the result from computational modal analysis. Then the experimental modal analysis for the prototype of the composite leaf spring was performed. The veracity of the prediction modal and the correctness of the finite element model were validated by the comparison between the prediction modal and the results of the computational modal analysis. According to the modal analysis results,the composite leaf spring could avoid resonances. The relationships among design variables and the firstorder modal frequency of the composite leaf spring were analyzed respectively by using the finite element model,which has been validated. The analysis results indicate that 0° ply orientation,composite with lower density and higher fiber volume content can reduce the possibility of resonances. The research results can significantly reduce the risk and the cost in the development of composite leaf springs.