Abstract:

Aiming at the multi-objective topology optimization design of structure, a method is presented based on compromise programming to normalize each sub objective to establish comprehensive objective function, with grey comprehensive relational analysis to determine the weight factors of the sub objective of the comprehensive objective function. Focusing on the suspension control arm of a commercial vehicle, the dynamic analysis, static analysis, and model analysis are used to obtain the stiffness and strength performance under typical operations and natural frequency. The shape of the outer contour is determined by topology and topography optimization of a plate. Using single objective topology optimization to reduce static compliances and improve the first three natural frequency, and the oscillation of the single objective optimization with frequency is suppressed by multi-frequency weighting method. The sub sequences and optimal sequence obtained by single objective topology are exerted comprehensive relational analysis to obtain the weight factors. The multi-objective topology optimization is carried out by compromise programming method, and the control arm is correspondingly optimized: The mass of modified structure is reduced by 9.3%; The stiffness and strength performance are improved and the natural frequency of each order are increased in different degree.

Key words: topology optimization, multi-objective, suspension control arm, compromise programming method, gray comprehensive relational analysis