【摘要】 分析了复杂构件的有限元动力计算结果与实验结果间的误差和误差产生的原因。用正弦稳态激振对一个具有法兰连接件的悬臂梁进行模态参数识别。根据识别的模态参数,用迭代的矩阵摄动法和广义逆技术求出具有法兰连接件的梁单元刚度矩阵的修正矩阵。再应用有限元程序对修正后的动力模型进行计算,精度明显提高。更多还原

【Abstract】 Analyzing the errors in FEM dynamic computation of complicated members,which were found in comparison with test results, the reason why such errorstake place in computation is studied.Sinusoidal steady shock--excitation was ca-rried out to conduct modal parameter identification for a thin--wall cantileverbeam with flange attached. Based on the modal parameters identified, a modifiedstiffness matrix for the beam is given using the methods of iterative pur-turbation and generalized inverse. The modified dynamic model is then checkedup and modified once again by FEM, and the results are found with higheraccuracy.更多还原