Multi-objective Topology Optimization And Analysis Of A Reversal Attitude Adjustment Mechanism

The spaceflight assembly platform with multiple degrees of freedom has a high degree of digitalization and automation,which is gradually changing the traditional assembly ideas and improving the assembly efficiency of the products.The market requires the assembly process of an aerospace engine.This paper intends to design a multi degree of freedom assembly platform,which is named a reversal attitude adjustment mechanism,to meet the requirements of the market.In order to achieve high strength and lightweight design requirements,this paper combines the topology optimization,which is the research hotspot in the current design field,to design for the flip arm which is core part of adjustment mechanism with multi-objective topology optimization.Based on that,the engineering design,type selection and checking work of other modules of adjustment mechanism are completed.The assembly problem in a space engine assembly process can be solved more safely and efficiently by adjustment mechanism.The multi-objective coupling topology optimization design method has a certain extent engineering application value,which can be extended to other parts of the shell structure optimization design.Firstly,the general flow and common theoretical methods of topology optimization are analyzed,and the variable density method is selected as the analytical method of the conventional objective topology optimization.In order to achieve the multi-objective coupling topology optimization design of the flip arm,the grey relational analysis,compromise programming and variable density method are combined to propose an objective multi-objective topology optimization method for the flip arm optimization design.Then,the finite element model of the flip arm is simplified and established.To obtain the basic data of the multi-objective optimization function,the flip arm finite element model have to do the single objective topology optimization.Using objective comprehensive multi-objective topology optimization method to determine and solve comprehensive objective function,then redesigning the structure of the flipper according to the finite element topology of the result.On the basis of topology optimization designof the flip arm,designing the rest of the pose adjustment module,and checking the transmission system.Finally,finite element simulation is carried out on the flip arm before and after optimization.The results are compared to verify the rationality of the multi-objective topology optimization design.The impact and vibration simulation of the optimized flip arm are carried out to verify the weakness of the structure.The dynamic contact force of the key lifting module is analyzed to verify the reliability of the dynamic contact force of the slideway slider.