FAN Xinliang1, WANG Tong1, ZHANG Lijun2, XIA Zunping1
1. State Key Lab of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
2. CRRC Tangshan Co., Ltd., Tangshan 063000, China
Abstract:In order to solve the problem of traditional model updating algorithm based on FRF during larger calculation scale having lower efficiency, a finite element (FE) model updating method based on reduced bases was proposed. Displacements of the system were expressed as linear superposition of modal synthesis reduced bases or modal shape reduced bases, and the natural coordinates were mapped into the reduced coordinates, so that the updating process was performed in the reduced coordinates. The frequency shift method was introduced into the reduced coordinates to realize FRF correction, and improve convergent speed of the updated parameters. A segmented FRF expanding method with higher accuracy was adopted to reduce additional error caused by the expanding process. Compared with the method based on condensation, the method based on reduced bases was more efficient and accurate. The updating results of GARTEUR aircraft simulation examples and bogie tests showed that the proposed method has higher accuracy and better robust performance; using it can efficiently obtain good correction results when the FE model has a larger scale.
范新亮1,王彤1,张丽君2,夏遵平1. 大型有限元模型频响快速修正方法[J]. 振动与冲击, 2021, 40(13): 193-200.
FAN Xinliang1, WANG Tong1, ZHANG Lijun2, XIA Zunping1. Fast correction method for FRF of large FE model. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(13): 193-200.
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