BJ-2型卡丁车车架的振动模态分析

Vibration modal analysis on the kart frame of BJ-2

为获取卡丁车车架的模态参数以评价BJ-2型卡丁车车架的动力特性,使用Hyperworks软件对卡丁车车架的数字样机进行了有限元仿真,确定了模态参数。对卡丁车车架的物理样机进行了试验模态分析,获得了卡丁车车架的前六阶模态参数。试验结果与有限元计算结果一致,表明发动机的振动激励避开了卡丁车车架固有频率,车架的设计是合理的。

Based on the modal parameters, the dynamic characters of the Kart frame can be evaluated. The paper establishes the finite element computation model of kart, and calculates the natural frequency and mode of vibration of the Kart frame with the hyperworks software. The modal experiment verifies the correctness of the results from the analysis. The modal parameters are obtained and the two results are consistent：the excitation from engine does not overlap with the inherent frequency of kart frame;the frame design is reasonable.