基于RecurDyn和ANSYS的液压挖掘机动臂结构优化设计

液压挖掘机动臂存在设计冗余的问题,为了对动臂的截面参数进行优化,首先对动臂的铰点受力进行了分析,建立了多体动力学模型,通过刚柔耦合动力学仿真,确定了动臂的各个铰点在坐标轴方向上的最大受力。通过单因素静力学仿真试验,建立了臂截面参数与最大等效应力之间的单因素数值拟合模型,通过多因素正交仿真试验,建立了多因素复合数值拟合模型,并将试验值与数值模型计算值进行比较,验证了模型的准确性。最后,以最大等效应力的最小值和抗弯截面系数的最小值为优化目标,利用遗传算法进行参数优化,获取最优设计变量。优化结果表明,优化后的截面参数较常规设计更能综合发挥材料的能力,优化方法为减少冗余设计提供了参考。

The Structural Optimization Design of Hydraulic Excavator Boom Based on Recurdyn and ANSYS

In order to optimize the cross section parameters of the excavator boom which has design redundancy matter,the force of the hinge point of the boom is analyzed at first.Then a multi-body dynamic model is established,through the rigidflexible coupling dynamics simulation analysis,the maximum force of each hinge point in the coordinate axis direction is determined.Based on the static simulation analysis,a single factor numerical fitting model between the arm section parameters and the maximum equivalent stress is established.According to the multi-factor orthogonal test,a multi-factor composite numerical fitting model is established,and the experimental values are compared with the calculated values of the numerical model to verify the accuracy of the numerical model.Last,taking the minimum of the maximum equivalent stress and the minimum of the bending section coefficient as the optimization objectives,the genetic algorithm is used to optimize the parameters and obtain the optimal design variables.The optimization results show that the optimized section parameters have lower maximum equivalent stress value than the conventional design,which is helpful to reduce the failure probability of the boom.It can provide reference for related design.