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| Random Vibration Analysis of Free Body Under Fluctuating Pressure Considering Correlation |
| Received:February 04, 2021 Revised:February 16, 2021 |
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| DOI：10.7643/issn.1672-9242.2021.03.005 |
| KeyWord:fluctuating pressure free body random vibration finite element method |
| Author | Institution |
| XU Mao |
Institute of Systems Engineering, CAEP, MianYang , China |
| LI Shang-ming |
Institute of Systems Engineering, CAEP, MianYang , China |
| WU Lian-jun |
Institute of Systems Engineering, CAEP, MianYang , China |
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| Abstract: |
| In order to obtain the structural response of the free body under a fluctuating pressure load, a finite element model of the random vibration analysis of the conical shell free body structure is established by using the finite element method. According to the random vibration analysis theory, the RMS value of acceleration response under free body fluctuating pressure is calculated based on the pulsating pressure load on the free body. When the loads are correlated to a certain degree, the calculation results are between the fully correlated and uncorrelated calculation results, the minimum difference being about 15%, and the maximum difference being about 50%. The calculation result shows that the correlation between loads can not be ignored when performing response analysis of free body structure under fluctuating pressure, and partition loading can improve calculation accuracy. |
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