基于实测载荷谱的载荷分解及后桥疲劳分析
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摘要
将汽车试验场实测载荷谱,按各路面载荷谱在频域下主要集中频段的高低划分为低频和高频路面载荷谱。对于高频路面载荷谱采用基于六分力测试信号的虚拟迭代方法进行分解,对于低频路面采用基于陀螺仪测试信号的方法计算车身姿态,再结合六分力测试信号的方法进行分解,且两种方法均要控制实测与仿真的轴头加速度、弹簧位移等信号的相对损伤比在0.5~2.0范围内。基于载荷分解得到后桥接口点的动态载荷,利用有限元和疲劳分析理论,对其进行疲劳寿命分析预测,反映了后桥在前期开发中存在的疲劳风险,同时进行相应的结构改进优化,分析表明,其寿命满足疲劳性能目标并通过了强化耐久试验的验证。
Based on the measured proving ground data, the road load spectrum was divided into low and high frequency bands. The virtual iterative method was used based on wheel forces to get the dynamic load components for high-frequency road spectrum. The vehicle body attitude was calculated from the gyroscope signal and the wheel forces were used to obtain the dynamic load components for low-frequency road spectrum. Both methods must ensure the relative damage range for the spindle acceleration and spring displacement is between 0.5 and 2.0. Based on dynamic load for the rear axle the fatigue analysis was conducted, and the fatigue risk was found in the early development phase. Finally the optimized structure has met the requirements of fatigue performance and passed the durability test.
Based on the measured proving ground data, the road load spectrum was divided into low and high frequency bands. The virtual iterative method was used based on wheel forces to get the dynamic load components for high-frequency road spectrum. The vehicle body attitude was calculated from the gyroscope signal and the wheel forces were used to obtain the dynamic load components for low-frequency road spectrum. Both methods must ensure the relative damage range for the spindle acceleration and spring displacement is between 0.5 and 2.0. Based on dynamic load for the rear axle the fatigue analysis was conducted, and the fatigue risk was found in the early development phase. Finally the optimized structure has met the requirements of fatigue performance and passed the durability test.
引文
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[2]方剑光,高云凯,徐成民.车身疲劳载荷谱的位移反求法[J].同济大学学报(自然科学版),2013,41(6):895-899.FANG Jianguang,GAO Yunkai,XU Chengmin.Displacement Back-Calculation of Body Fatigue Loading Spectrum[J].Journal of Tongji University(Natural Science),2013,41(6):895-899.(in Chinese)
[3]彭为,靳晓雄,孙士炜.道路模拟试验中道路载荷谱的选择方法[J].上海工程技术大学学报,2004,18(1):6-9.PEI Wei,JIN Xiaoxing,SUN Shiwei.A Selecting Method of Road Loading Spectra Used in Road Simulation[J].Journal of Shanghai University Engineering Science,2004,18(1):6-9.(in Chinese)
[4]张觉慧,金锋,余卓平.道路模拟试验用载荷谱样本选择方法[J].汽车工程,2004,26(2):220-223.ZHANG Juehui,JIN Feng,YU Zhuoping.A Method of Selecting Load Spectra for Road Simulation Test[J].Automotive Engineering,2004,26(2):220-223.(in Chinese)
[5]POWER E.Cycle Counting Methods and the Development of Block Load Fatigue Programmes[C]//SAE Paper780102,1978.
[6]周传月,郑红霞,罗慧强.MSC.Fatigue疲劳分析应用与实例[M].北京:科学出版社,2005.ZHOU Chuanyue,ZHENG Hongxia,LUO Huiqiang.MSC.Fatigue Analysis Application and Examples[M].Beijing:Science Press,2005.(in Chinese)
[7]王国军.NSoft疲劳分析理论与应用实例指导教程[M].北京:机械工业出版社,2007.WANG Guojun.Nsoft Fatigue Analysis Theory and Application Examples[M].Beijing:China Machine Press,2007.(in Chinese)