Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6955176 | Mechanical Systems and Signal Processing | 2016 | 14 Pages |
Abstract
A Lagrange direct method is proposed to calculate the second-order sensitivity of modal assurance criterion (MAC) values of undamped systems. The eigenvalue problem and normalizations of eigenvectors, which augmented by using some Lagrange multipliers, are used as the constraints of the Lagrange functional. Once the Lagrange multipliers are determined, the sensitivities of MAC values can be evaluated directly. The Lagrange direct method is accurate, efficient and easy to implement. A simply supported beam is utilized to check the accuracy of the proposed method. A frame is adopted to validate the predicting capacity of the first- and second-order sensitivities of MAC values. It is shown that the computational costs of the proposed method can be remarkably reduced in comparison with those of the indirect method without loss of accuracy.
Related Topics
Physical Sciences and Engineering
Computer Science
Signal Processing
Authors
Sheng Lei, Kuanmin Mao, Li Li, Weiwei Xiao, Bin Li,