【摘要】 针对复合形法全局搜索能力不强以及对复杂的优化问题出现"最坏点映射失败"现象几率较高的局限性,将混沌优化方法和复合形法进行耦合,提出了基于混沌的改进复合形法。该方法充分利用了混沌运动的内在随机性、遍历性以及对初始条件敏感性等运动特性,通过引入混沌变量构造初始复合形、采用混沌序列生成映射系数初值以及加入混沌扰动处理映射失败等改进措施来提高全局搜索能力和降低映射失败的几率;编制了相应算法程序,并应用于冶勒沥青混凝土心墙堆石坝土体参数的反演分析。结果表明,该算法合理,收敛性和稳定性较好,收敛速度较快。更多还原

【Abstract】 A modified complex method based on chaos optimization is put forward to overcome the limitations of basic complex method,weak global searching capability and high probability of mapping failure for complicated optimization problems.It uses the features of chaos such as inherent randomness,ergodicity and sensibility to initial condition and takes the measures of constructing an initial complex by introducing chaotic variables,generating initial mapping parameters by using chaotic sequence and handling mapping failure by adding chaotic variables to disturb the current state of the complex.An algorithm is worked out and applied to parameters back-analysis of the Yele asphalt concrete core rock-fill dam.The results of this method show improvements in stability and convergence rate.更多还原