基于整车路面谱的副车架开裂台架试验及仿真OACSTPCD

The study was conducted to examine the durability issue occurred in front stabilizer bar bracket connect-ed to sub-frame in full vehicle testing.Firstly,stabilizer bar system was plastered with strain gauges and calibrated,and drop link force and stabilizer bar twist displacement acquired on proving ground,sub-frame with stabilizer bar system physical test rig was designed and built,and rig tests in accordance with durability specifications were con-ducted.The test results showed that built physical test rig could greatly reappear crack location in full vehicle tes-ting,the fatigue life of the physical bench had a deviation of 2.5％compared to full vehicle testing.Based on this,a stabilizer bar and sub-frame multi-body virtual model was built with the same constraint boundary and the same loading method of the physical test rig.Then CAE fatigue simulation was used through quasi-static finite element fatigue life analysis method to reappear related area risk.The simulation results showed that phase and amplitude had a good coincidence in time domain,the PSD spectrum also had a good accuracy in frequency domain,the rela-tive damage was almost closed to 1 with the comparison between the simulation and test in droplink force and stabi-lizer bar relative displacement.The deviation between the simulated fatigue life at the relevant risk position and the test life of the full vehicle was 6.25％.A higher accuracy risk position load was obtained,and the reappearance of durability risk position was achieved.Finally,based on simulation fatigue load,the optimization risk structure was evaluated.Optimized proposal eventually passed the test rig and full vehicle testing successfully.