四分头机构的多目标结构优化

Multi-Objective Structural Optimization of the Four-Separate Mechanism

首先借助ANSYS Workbench对四分头机构进行有限元分析,找出薄弱环节。然后采用加强筋的处理方法分析其对整体结构的影响,并利用拓扑优化确定四分头机构的整体结构形状。针对四分头机构的动态性能对其进行了谐响应分析,找到了其动态薄弱环节为其第一阶固有频率,分析出四分头机构各尺寸参数对其固有频率、自身最大应力、变形以及质量的影响,求解出在满足强度、刚度要求且不发生共振的情况下四分头机构轻量化最优解。优化结果表明:四分头旋转架的第一阶固有频率提高了24.9%,最大位移变形值减小了47.8%,最大等效应力减小了77.9%,质量减小了23%。提高了机构的强度,安全性能,减少了质量,降低了机构的材耗、能耗,节约了成本。

By using the ANSYS Workbench software,element analysis of the four-separate mechanism is made to find out the weak part.To deal with that,reinforcing ribs is adopted with its effect to the overall structure been analyzed and the topological optimization is used to determine the overall structure shape of the four-separate mechanism.The dynamic performance of the four-point mechanism is analyzed in harmonic response and the dynamic weak link is found in its first order natural frequency.The influence of each size parameter on its natural frequency,its maximum stress,deformation and quality is analyzed.The optimal solution of the four-separate mechanism is obtained when the strength,stiffness and resonance are satisfied.The optimization results show that the first order natural frequency of the four-point rotating frame is increased by24.9%,and the maximumequivalent strain value is reduced by 47.8%,the maximum equivalent stress was reduced by 77.9%and the mass decreased by 23%.It improves the strength,safety and quality of the organization,reduces the material consumption and energy consumption of the organization,and saves the cost.