基于优化设计的印制板组件精细化动力学建模方法

A REFINED APPROACH FOR DYNAMIC MODELING OF A PRINTED CURCUITED BOARD ASSEMBLY BASED ON OPTIMIZATION DESIGN

以模态测试结果作为修正的目标值,提出了采用ANSYS优化设计对螺栓连接型印制板组件进行精细化动力学建模的方法.首先使用ANSYS概率设计模块计算出印制板组件特征值对结构材料参数的灵敏度.然后基于灵敏度分析结果与螺栓连接处的建模误差,使用ANSYS优化设计模块对印制板组件进行参数修正,最后通过比较不同边界条件下组件的固有特性验证了修正后参数的有效性.研究表明:基于灵敏度分析和建模误差的优化设计方法可以有效提高螺栓连接型印制板组件动力学模型的建模精度.

Setting the modal test results as the object parameters, a refining approach for the dynamical modeling of a bolted printed circuit board assembly （BPCBA） is proposed in this paper based on ANSYS optimization de- sign. Firstly, the sensitivities of the eigenvalues of a BPCBA to material parameters are calculated by using proba- bilistic design system （PDS） through ANSYS software. Secondly, according to the results of sensitivity analysis and the modeling error around the area of bolted connection, the material parameters of the BPCBA model are modified by using ANSYS optimization design method. Finally, the validity of the updated parameters are verified by comparing the natural frequencies of the BPCBA at different boundary conditions. The result shows that the ac- curacy of the model is significantly improved by optimization design method based on sensitivity analysis and mod- eling error.