CAJ | 학술논문

模型修正中通常需要解决自由度匹配问题,模型缩聚是解决这一问题的一种方法.当有限元建模误差较大时,模型缩聚的近似会大大降低模型修正的精度.针对这一问题,提出了模型缩聚-模型修正迭代方法,消除模型缩聚带来的误差.文中应用IRS缩聚和基于频响函数的模型修正方法对提出的迭代方法进行了具体讨论.通过板梁混合结构的数值模拟实验,比较了现有修正方法和迭代修正方法的修正精度.结果表明提出的迭代方法有效提高了修正精度,使修正后的模型频率和物理参数更逼近真实值.同时该方法具有较高的迭代收敛效率,符合实际工程应用的要求.
모형수정중통상수요해결자유도필배문제,모형축취시해결저일문제적일충방법.당유한원건모오차교대시,모형축취적근사회대대강저모형수정적정도.침대저일문제,제출료모형축취-모형수정질대방법,소제모형축취대래적오차.문중응용IRS축취화기우빈향함수적모형수정방법대제출적질대방법진행료구체토론.통과판량혼합결구적수치모의실험,비교료현유수정방법화질대수정방법적수정정도.결과표명제출적질대방법유효제고료수정정도,사수정후적모형빈솔화물리삼수경핍근진실치.동시해방법구유교고적질대수렴효솔,부합실제공정응용적요구.
In order to solve the problem of low accuracy of model updating due to unmatched degrees of freedom,an iterative method for model reduction-model updating was proposed to dispel the error caused by model reduction. The method of IRS model reduction and model updating based on frequency response function (FRF),which is used in the iterative method,was discussed. The updating accuracy of the current method was compared with that of the iterative method by a numerical example of beam-plane structure. The result shows that the iterative method can increase the updating accuracy successfully and make the frequencies and other physical parameters in finite element model closer to those of the real structure. In addition,the method has high efficiency of iteration,which makes it meet the need of real engineering application.