材料热物性与热源强度辨识的改进遗传算法

Modified Genetic Algorithm for Identifying Material Thermal Properties and Strength of Heat Source

建立二维非线性导热逆问题(IHCP)的数学模型.通过对基本遗传算法逐步改进得到三种不同改进阶段的遗传算法,分别用于反演导热问题中材料的导热系数及其内部热源强度,并比较遗传算法在各改进阶段用于求解导热逆问题时的收敛速度与求解精度,寻求一种使导热逆问题求解效率与计算精度更高的遗传算法改进策略.结果表明:提出的遗传算法改进策略达到了预期目的.

A mathematical model for twodimensional nonlinear inverse heat conduction problem （ IHCP） is established. Three kinds of genetic algorithm at different modified phase are proposed for identifying material thermal conductivity and strength of heat source. Convergence speed and calculation precision of genetic algorithms at different modified phase are compared. Calculation results show that the genetic algorithm modified strategy proposed achieve higher convergence speed and calculation precision.