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| Uniaxial Virtual Vibration Test Technology |
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| DOI：10.7643/issn.1672-9242.2023.04.015 |
| KeyWord:virtual vibration random vibration finite element vibration table modal test model revision |
| Author | Institution |
| ZHAO Yan-tao |
Aerospace Science&Industry Corp Defense Technology R&T Center, Beijing , China |
| CHEN Yao |
Aerospace Science&Industry Corp Defense Technology R&T Center, Beijing , China |
| LI Jian |
Aerospace Science&Industry Corp Defense Technology R&T Center, Beijing , China |
| JIA Jun-jie |
Aerospace Science&Industry Corp Defense Technology R&T Center, Beijing , China |
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| Abstract: |
| The work aims to explore reliability and limitations of the virtual random vibration test system built by combining finite element method and closed-loop random vibration control method, and find out the next work direction. A virtual random vibration test system was built and the virtual test results obtained were compared with the physical test results. The whole process was as follows:A random vibration controller model and a vibration system model were built respectively, and then they were combined into a whole closed-loop random vibration virtual test system. In the controller modeling, the whole closed-loop control process and control principle of random vibration was introduced. In finite element modeling of vibration table, the finite element model of moving coil and boundary conditions were introduced. After finite element modeling of the vibration table, the fixture and the product, they were revised according to the modal test results. The ways to modify parameters of the finite element model so that the modal simulation results were consistent with the modal test results were introduced. The finite element models of the vibration table, the fixture and the product were combined into a finite element model of the vibration system after modification. The finite element model of the vibration system and the controller model were combined to construct a closed-loop random vibration virtual test system. The virtual test results were compared with the physical test results. The comparison results of the two were basically consistent in the low frequency band before 400 Hz. According to the comparison results, a summary and analysis were given in the end. It is concluded that the virtual test results of the virtual vibration system built by this method are relatively consistent with the physical test results in the low frequency band before 400 Hz. The future work is presented. |
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