基于优化方法的燃料组件简化梁模型材料参数等效研究

Study on material parameter equivalence of simplified single beam model of fuel assembly based on optimization method

为解决分析燃料组件精细化实体模型某些力学行为时消耗计算资源庞大且费时费力的问题,基于一定的假设和简化,采用优化算法建立与燃料组件实体模型等效的二维半精细化四梁模型和三维简化单梁模型。采用优化方法等效二维半精细化四梁模型到三维简化单梁模型刚度和密度。结果表明:在相同载荷边界条件下,加入优化迭代出的材料参数结果进行计算后,等效的三维简化单梁模型与二维半精细化四梁模型的位移及1阶模态特征值基本一致。采用该二维半精细化四梁模型到三维简化单梁模型等效的优化方法可行,提高了开展全堆芯模型某些力学分析的计算效率。

In order to solve the problem that the analysis of some mechanical behaviors of the refined solid model of the fuel assembly will consume huge computing resources and be time-consuming and laborious,based on certain assumptions and simplifications,an optimization algorithm is used to establish a 2D semi-refined model of 4 beams and a 3D simplified model of single-beam equivalent to the solid model of the fuel assembly.The optimization method is used to equivalent the stiffness and density of the 2D semi-refined model of 4 beams to the 3D simplified model of single-beam.The results show that under the same load boundary conditions,the displacement and first-order modal eigenvalues of the equivalent 3D simplified model of single-beam and 2D semi-refined model of 4 beams are basically the same after adding the material parameter results calculated by the optimization iteration.It is feasible to use the equivalent optimization method from the 2D semi-refined model of 4 beams to the 3D simplified model of single-beam,which improves the computational efficiency of some mechanical analysis of the whole core model.