基于对比度增强抑制灰度的改进优化准则法

摘要

为了抑制变密度法拓扑优化结果中的灰度单元,基于对比度增强策略,提出了两种形式的对比度增强算子,引入到优化准则法迭代计算中,对优化准则法进行了改进.对比度增强算子能够拉大单元灰度差别,驱动中间密度向两极进行分化,最终使优化收敛于0/1材料分布状态.采用典型数值算例对该方法进行了验证,计算结果表明,该方法能够得到拓扑结构清晰的优化结果.%In order to suppress gray scale elements in density-based topology optimization,two kinds of contrast enhancement operators were proposed based on contrast enhancement strategy and introduced into the iterative calculation to modify the optimality criteria method.The contrast enhancement operator might enlarge the gray scale differences of the elements,drive the intermediate densities to the two ends of the range,and finally make the results convergence to the 0/1 material distribution.The effects of the proposed method were investigated with classical numerical examples.The results show that the optimization results with crisp boundaries are obtained by applying the proposed method.