橡胶衬套对扭力梁悬架运动特性的影响分析

Analysis for Rubber Bushes Impacting on Kinematics &Compliance of Twist Beam Suspension

鉴于衬套对悬架和整车性能影响较大的原因,以扭力梁后悬架的斜置橡胶衬套为研究对象,设衬套静态特性试验结果为逼近目标,运用自适应响应面法对衬套橡胶本构关系的3阶减缩Yeoh多项式系数进行优化识别,基于优化系数构建精确衬套模型并建立新的约束与加载条件,在ABAQUS中求解得到绕轴向的三向刚度,实现了衬套全六向刚度的重构;进一步建立扭力梁后悬架运动特性仿真试验台,对影响仿真响应结果较大的衬套三轴向刚度进行全因子试验设计,将所得优化结果同悬架运动特性主要评价指标进行比较后可知,行驶平顺性等得以改善,而优化前后的外倾角顺从性变化不大,即衬套对扭力梁悬架外倾角变化影响很小.

In view of rubber bushes′greater impact on suspension and vehicle performances,the inclined rubber bush of a twist beam rear suspension has been studied as a research object.The results of the rubber bush′static characteristic tests have been set to an approaching targets,the 3-order coefficients of Yeoh reduced polynomial have been identified by means of an adaptive response surface optimization algorithm to build a constitutive relation of the bush rubber.The accurate bush model has been built,which is based on the optimized coefficients,and the new constraint and load conditions been applied,the stiffness around the three axial solved in ABAQUS,so all the six stiffness have been reorganized.Further the suspension simulation test rig of the Kinematics ＆ Compliance have been modeled,the three axial stiffness with greater impactions on suspension′s Kinematics ＆ Compliance simulation response been used as the design variables to do the full factorial experimental design,by comparing the optimization results with the changing laws of the main indexes of the suspension Kinematics ＆ Compliance,the conclusions can be gotten that the vehicle ride comfort is improved.But the camber angle has little change before and after optimization,it shows that the bushes have little effect on the camber angle of twist beam suspension.