Multi objective topology optimization on the bearing plate of 60 MN force standard machine
CUI Zhengzheng, YANG Xiaoxiang
(School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350000, China)
 

Abstract: Aiming at the problem of the 60 MN force standard machine bearing plate stracture topology optimization of light weight not only requiring the stiffness but also the low order natural frequency of the structure to maximized. A weighted average method which tiansformed the multiobjective optimization problem into a single objective optimization problem was presented in this paper. The weighted average frequency method was applied for the seleeted various target function with low order natural frequency to achieve the dynamic characteristics optimization of the bearing plate structure; the weighted average method was applied for the stiffness and frequency of comprehensive target function to achieve the multiobjective topology optimization of the bearing plate structure. Finally, a new kind of bearing plate structure was designed. The results show that the maximum deformation is reduced by 25.5%, the maximum stress is reduced by 14.1%, and the first five order natural frequency is increased by 5.7%~13.2%. It can be seen that the first five order natural frequency and the static stiffness of the new bearing plate structure are improved remarkably, which verifies the feasibility of the optimization method.
Key words: bearing plate; multiobjective; average natural frequency; topology optimization