专用汽车分动箱模态试验与分析

针对某专用汽车分动箱上应急泵螺栓断裂问题进行了试验模态分析。先对分动箱进行单独的模态试验,得到其相应的模态参数,然后对工作状态的分动箱进行路试试验,根据得到的传递函数进行振动分析。为了防止模态试验中模态遗漏和虚假模态的出现,在分动箱模态试验时,将得到的试验模态振型与有限元计算得到的振型作相关性分析,提取出真实的模态参数。通过试验模态分析,找到了螺栓断裂的原因,给出了相应的改进办法。

Modal Experiment and Analysis of Certain Special Vehicle Transfer Case

The modal analysis has been done to the problem of the rupture of the bolt in the pump which used in meeting an emergency in the transfer case of certain special vehicle. At first, the modal experiment of the transfer case has been done, and the modal parameters have been obtained, and then let the vehicle steer on the road which was similar to the condition of the working station. Combined with transmission route of stimulation, the vibration of the vehicle was analyzed. The correlation analysis of mode shape was done so as to prevent the generation of spurious mode and mode from missing. The fundamentality reason of rupture of the bolt was found, the corresponding ameliorable method was given.