- 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: | SONG Shizhe, DONG Dawei, HUANG Yan, XU Fanghui, ZHANG Wei, YAN Bing. Vibration Energy Decoupling Method and Application for Flexible Double-Layer Vibration Isolation Systems[J]. Journal of Southwest Jiaotong University, 2023, 58(2): 304-313. doi: 10.3969/j.issn.0258-2724.20210993
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The original energy decoupling method is not suited to flexible double-layer vibration isolation systems, and therefore a multi-degree of freedom model is developed to represent the flexible characteristics of the equipment and intermediate mass. Then, on the basis of the model, a generalized elastic force is proposed to decouple the flexible vibration isolation system. The decoupling method is then extended to the study of flexible structures. Finally, using a two-layer vibration isolation system of a powertrain as an example, the method is adopted to evaluate the decoupling performance of the elastic mode of the frame. Finally, a vibration test was used to verify the effectiveness of this method. The results show that after the primary vertical frequency of the powerpack decreases from 12 Hz to 8 Hz, all of the modal frequencies of the system are reduced by different extents. The first two order frequencies of the rigid body vibration modes decreased by 50.00% and 49.98%, respectively. The elastic modal frequency of the frame has a greater impact because of its lower natural frequency compared with that of the diesel generator set. The elastic modal frequency of the frame decreased by 8.32%, and that of the diesel generator set decreased by 0.80%. In the elastic vibration mode vibration of the frame, the proportion of the elastic vibration energy of the frame could increase by 14.88%, and the proportion of the rigid body vibration energy could be reduced by 90.64%. Reducing the vertical frequency of the first stage vibration isolation system can improve the vibration decoupling effect and reduce the vibration transmission.
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