HE Ting ting , LI Fang

 

(College of Mechanical Engineering， Zhejiang University Of Technology， Hangzhou 310014， China)

 

 

Abstract: Aiming at solving the problem of the frame resonance which was stimulated by the excitation generated from uneven road surface, the rotationally wheels and vibration of electric machinery when FSAE car was driven on the road,and to reasonably arrange the installation position of the load on the frame, free modal analysis and constrained modal analysis were investigated respectively (the objects of the modal analysis included the suspension frame system, the frame load system and the suspension frame load system). The vibration mode characteristics of the free modal analysis and the vibration mode characteristics of three frame systems were compared and analysed. It was indicated that the vibration mode of the suspension frame load system derives from the vibration mode of the frame subsystem (the suspension frame system and the frame load system). The improved scheme of the suspension frame load system was presented for improving the dynamic performance of the frame system. The flexible restraint modal test of the suspension frame load frame system was carried out, and the correctness of the simulation data was verified. The results indicate that the frame system can meet the comfort requirements, can avoid the occurrence of resonance.

 

Key words: FSAE car;frame;finite element;free mode ;constrained mode