Uncertainty in Cross Orthogonality Checks
Uncertainty in Cross Orthogonality Checks
复制标题
交叉正交性检查的不确定性
DOI：
10.1299/jsmec.46.692
复制
发表时间：
2003
期刊：
影响因子：
--
通讯作者：
Yuichi Matsumura
中科院分区：
文献类型：
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作者：
Yuichi Matsumura
有限元结构动力模型通常使用从模态试验中获得的数据进行验证。虽然已知测试可变性可能影响验证，但在验证过程中测试可变性通常被忽略。本文描述了交叉正交性检验对试验变异性的敏感性。交叉正交性校核是结构动力学界所接受的一种相关技术，因为它比标准模态保证准则具有更高的精度。在此基础上，基于灵敏度与传感器位置的关系，提出了交叉正交检验的不确定度指标。给出了一些人工生成的测试用例的结果，以证明所提出方法的适用性。
Finite element structural dynamic models are typically validated using data obtained from a modal testing. Although it is known that test variability may affect the verification, the test variability is typically ignored in the verification process. This paper describes the sensitivities of cross orthogonality check to the test variability. The cross orthogonality check is one of correlation techniques which is gaining acceptance in the structural dynamics community, because of its improved accuracy over the standard modal assurance criterion. Then an uncertainty index of the cross orthogonality check is proposed based on the fact that the sensitivities are much dependent on sensor placement. The results of some artificially generated test cases are presented to demonstrate the applicability of the proposed approach.