Mounting bracket optimization based on integral frames modal analysis
                                            HE Haitao1, CHEN Zhenlei1, LIAO Junxiong1, LI Jiancheng1, ZHAO Bei2
(1.Faculty of Maritime and Transportation, Ningbo University, Ningbo 315800,China;2.SANY Heavy Machinery Co., Ltd., Kunshan 215300,China)

Abstract: In order to resolve the vibration amplification issue in the powertrain mounting system of a given excavator, the vibration isolation performance was evaluated and optimized by the methods of experimental data analysis and computer simulation. The corresponding acceleration spectrum and resonance of the mounting system in 290 Hz and other frequency bands were analyzed and studied. The reason of the fault was captured by the whole frame modal analysis method. Meanwhile, the optimization scheme of the suspension bracket and frame suggested by the simulation results was verified by the experiment. The results show that the vibrational transmission rate of the #3 suspension gets optimized and reaches the target of decreasing the vibration. Although the transmission rate of the #2 suspension becomes worse slightly, the peak value of the vibrational acceleration at the #2 position is greatly reduced by the optimization. The increase of the transmission rate of the #2 suspension is due to the tiny raise of the overall acceleration.

Key words: suspension bracket; vibration acceleration; modal analysis; optimum design