仝宗凯,赵保平,陈强.变温环境下结构高频瞬态能量响应预示[J].装备环境工程,2018,15(11):65-69. TONG Zong-kai,ZHAO Bao-ping,CHEN Qiang.Prediction of Transient Energy Response for Structures under Time-varying Thermal Load[J].Equipment Environmental Engineering,2018,15(11):65-69. |
变温环境下结构高频瞬态能量响应预示 |
Prediction of Transient Energy Response for Structures under Time-varying Thermal Load |
投稿时间:2018-07-15 修订日期:2018-11-25 |
DOI:10.7643/ issn.1672-9242.2018.11.012 |
中文关键词: 热效应 时变结构 瞬态能量 统计能量分析 |
英文关键词:thermal effect time-varying structure transient energy response statistical energy analysis |
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中文摘要: |
目的 解决变温环境下结构的高频瞬态能量响应预示问题。方法 基于统计能量分析方法,通过考虑时变参数对结构能量的影响和热效应引起的材料力学性能变化和热应力对统计能量分析参数的影响,提出了一种变温环境下结构高频瞬态能量响应预示方法。以双振子模型为例,通过与Newmark-beta 法的对比验证数值方法的准确性。结果 该能够较好地捕捉结构高频能量响应的周期性变化规律,其峰值时间和峰值能量与精确数值解基本吻合。以L型折板系统为例,研究了20~300 ℃变温环境下结构的瞬态能量响应变化规律,子系统1和子系统2之间的能量交换远小于两子系统中因阻尼引起的能量消耗,子系统2瞬态能量响应的峰值时间为4.3 ms、峰值能量为0.09 J。结论 该方法具有较高的计算精度和计算效率,能够较好地适用于结构高频瞬态能量响应预示。 |
英文摘要: |
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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