关键词: 

Abstract:

In order to avoid the local minimum during the optimization iterative process based on the SKO technique, a continuous step-up reference stress criterion was proposed. The reference stress was defined that the average stress multiplied a weighted parameter which can be changed by the current iterative state automatically. When the optimal iteration achieved a local minimum, the weighted parameter was increased automatically by a certain specified value, hence the reference stress was increased and the optimal iteration can be continued. The proposed method included two iterative cycles, in which the inner one was the local optimal iteration, while the outer one was the global optimal iteration. When the volume change between two iterations is smaller than a specified tolerance, the optimal structure is obtained. The design parameters of the proposed method were studied, and the validity of the proposed method was given by several typical design examples.

Key words: SKO, structural topology optimization, local optimum structure, reference stress criterion