- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | LIU Quanmin, YE Xiaoyi, SONG Lizhong, SUN Yifei, LIU Linya. Dynamic Characteristic Analysis of Constrained Damping Plate Based on Iterative Revised Modal Strain Energy Method[J]. Journal of Southwest Jiaotong University, 2023, 58(6): 1311-1317, 1431. doi: 10.3969/j.issn.0258-2724.20220414
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The neglect of the imaginary stiffness and frequency-dependent characteristic of parameters of viscoelastic materials for the damping layer of the constrained damping structure will result in the error of the modal loss factor of the structure. The influence of the imaginary stiffness and frequency-dependent characteristic of parameters of viscoelastic materials on the modes of vibration, natural frequencies, and modal loss factors of the constrained damping plate was investigated by using the revised modal strain energy (RMSE) method and iterative algorithm. Moreover, the influence of the thickness of the damping layer and that of the constrained layer of the constrained damping plate on the modal loss factor of the structure was discussed. The results show that the natural frequency and modal loss factor calculated by the method in the paper are in good agreement with the experimentally measured values in the related literature. The modal shapes at all orders are not changed, but a reversal of the phase of several modes of vibration occurs if the frequency-dependent characteristic of parameters of viscoelastic materials is ignored. The shear modulus of the damping layer directly affects the natural frequency of the structure. If the frequency-dependent characteristic is ignored, the calculation results will be overestimated by 17.2% at the lower-order modal and underestimated by 7.6% at the higher-order modal. The maximum error of the modal loss factor is up to 56.0% at lower order modal when the frequency-dependent characteristic of the viscoelastic material is ignored. The modal loss factor of the constrained damping plate increases with the damping layer thickness and first goes up and then goes down with the constrained layer thickness.
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