【摘要】 基于子矩阵型模型修正思想,采用缩聚模型的模式,推导出一套质量、刚度矩阵建模错误诊断和模型修正公式,并提出了一种简单、有效的算法。该方法的优点是避免了测量模态的插值以及所引入的误差;其次,它既可告知建模错误发生的区域,又可以获得一个与试验结果相一致的修正模型;其三不要求计算有限元模型的特征对。文中考例表明,建模错误区诊断明确,且所得修正模型与实验结果达到良好一致。更多还原

【Abstract】 In this paper,a set of diagnosis and modifying formula for structure finite element model with mass and stiffness error is derived being based on model modification idea of submatrix-type method,and a simple and efficient iterative arithmetic is put forward.The features of the method are that measured mode interpolating and it’s interpolation error are avoided;secondly, not only model errors can be localized,but also a updated model coinciding with experimental data can obtained;thirdly,the modes of the structure finite element model has not need to be calculated.The numerical example shows the“features”mentioned above.更多还原