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[求助] BESO法对位移反向器进行拓扑优化得不到结果

采用BESO法对常见验证例的位移反向机构进行拓扑优化,迭代开始的时候总是去掉不应该去掉的材料,迭代开始时就去掉了左下角部位的材料(上下对称模型,只取了下半部分),我是按照论文(Li, Y., et al., Evolutionary topology optimization of hinge-free compliant mechanisms. International Journal of Mechanical Sciences, 2014. 86: p. 69-75.)中的相关量进行定义的,为什么就不行啊?哪位大神能指点一下啊?
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