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| Prediction of Transient Energy Response for Structures under Time-varying Thermal Load |
| Received:July 15, 2018 Revised:November 25, 2018 |
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| DOI：10.7643/ issn.1672-9242.2018.11.012 |
| KeyWord:thermal effect time-varying structure transient energy response statistical energy analysis |
| Author | Institution |
| TONG Zong-kai |
1. Beijing Mechanical-Electronic Engineering Institute, Beijing , China |
| ZHAO Bao-ping |
1. Beijing Mechanical-Electronic Engineering Institute, Beijing , China |
| CHEN Qiang |
2. Institute of Aerospace Machinery and Dynamics, Southeast University, Nanjing , China |
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| Abstract: |
| Objective To solve the problem of predicting the high-frequency transient energy response of structures under varying temperature conditions. Methods Based on the statistical energy analysis, effects of time-varying parameter on structure energy, change of mechanical properties of materials caused by thermal effect and effect of thermal stresses on analysis parameters of statistical energy were considered. A method for predicting high-frequency transient energy response of structures under varying temperature conditions was proposed. With the two-oscillator model as an example, the accuracy of the numerical method was verified by comparing with the Newmark-beta method. Results This method could better capture the periodic variation of the high-frequency response of the structure. Its peak time and peak energy were basically consistent with the exact numerical solutions. For an L-shaped folded plate under time-varying thermal load form 20 ℃ to 300 ℃, the energy exchange between system 1 and subsystem 2 was much smaller than the energy consumption caused by damping in subsystem 1 and subsystem 2. The peak time of transient energy response of subsystem 2 was 4.3 ms and the peak energy was 0.09 J. Conclusion The proposed method has high computational accuracy and efficiency, and is applicable to predicting high-frequency transient energy response of structures. |
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