Modal acoustic contribution analysis of tractor cab
1. Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education, Shandong University, Jinan, Shandong 250061, China; 2. School of Mechanical Engineering, Shandong University, Jinan, Shandong 250061, China
Abstract： To recognize the effect of major vibration models on the earside noise level of tractor driver, the calculation model among sound pressure in cab sound field, structural model and acoustic modal contribution factors was established. Based on the structureacoustic coupling finite element model of tractor cab, the simulation was conducted to analysis the modal acoustic contribution to the peak noise in different frequency bands, and the main vibration modes were obtained according to the contribution value. The main vibration models were rectified, and the sound pressure levels(SPLs) of pre and post rectification were compared. The results show that the improved main modes can significantly reduce the peak noise level and the SPL at tractor driver′s earside in the frequency band, and the noise can be effectively controlled by dividing frequency band.
2018, Vol. 39 
