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| Identification of Modal Parameters for Certain Mechanism Containing Complicated Pipe Structures |
| Received:January 25, 2016 Revised:June 15, 2016 |
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| DOI：10.7643/ issn.1672-9242.2016.03.021 |
| KeyWord:modal parameters identification cooling device gas duct |
| Author | Institution |
| ZHAO Peng-fei |
Aerospace Science & Industry Corp Defense Technology R & T Center, Beijing , China |
| LI Hong-min |
Aerospace Science & Industry Corp Defense Technology R & T Center, Beijing , China |
| ZHANG Xin-yun |
Aerospace Science & Industry Corp Defense Technology R & T Center, Beijing , China |
| ZHENG Hong-ling |
Aerospace Science & Industry Corp Defense Technology R & T Center, Beijing , China |
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| Abstract: |
| Objective To obtain the modal parameters and dynamic properties of products with complicated structures. Methods Using the free modal testing based on impact excitation, the modal frequencies of local structure were determined through comparing the amplitude of frequency-response function curves. By the method of half-power bandwidth and special analysis software, the damping-ratio and vibration mode were calculated respectively. Results The modal parameters of the key components for dynamic properties of a certain mechanism were identified. Conclusion The modal frequencies of the mechanism shell were away from that of the cooling device. The first transverse mode of the cooling tube was generated by its own structural property, but the second and vertical modes were arisen by the mode of decompression valve. The dynamic properties of the gas duct were mainly influenced by the mode of the cooling device. |
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