非均匀热载荷对统计能量分析参数的影响

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (21) : 158-164.

论文

非均匀热载荷对统计能量分析参数的影响

陈强1,2，杨轩2,3，李彦斌2,3，张鹏1,2，吴邵庆1,2，费庆国1,2

作者信息 +

Effects of nonuniform thermal load on statistical energy analysis’s parameters

CHEN Qiang1, 2, YANG Xuan2, 3, LI Yanbin2, 3, ZHANG Peng1, 2, WU Shaoqing1, 2, FEI Qingguo1, 2

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文章历史 +

摘要

基于有限元法和计及热效应的功率输入法，以各边简支L型折板为研究对象，开展非均匀热载荷对其统计能量分析参数的影响研究。首先开展雨流载荷作用下的仿真分析验证统计能量参数获取方法的准确性，然后研究非均匀热载荷中平均温度和非均匀程度对结构模态密度、内损耗因子和耦合损耗因子的影响。结果表明：在不同非均匀程度、相同平均温度热载荷作用下，热载荷非均匀程度的增加使得其模态密度下降，同时导致L型折板结构内损耗因子和耦合损耗因子的下降；热载荷平均温度的增加使得热载荷的非均匀分布对L型折板结构统计能量分析参数的影响逐渐增大。

Abstract

Based on the combination of the finite element method and the power injection method considering thermal effect, a simply-supported L-shaped folded plate was taken as a study object to investigate effects of nonuniform thermal load on statistical energy analysis’s parameters.Firstly, numerical analysis under the excitation of rain on a roof was conducted to verify the correctness of the acquisition method of statistical energy analysis’s parameters.Then the effects of temperature gradient and average temperature of nonuniform thermal load on structure’s modal density, internal loss factor and coupling loss factor were studied.The results showed that under the action of thermal load with different temperature gradients and the same average temperature, the L-shaped folded plate’s modal density drops and its internal loss factor and coupling loss factor simultaneously decrease with increase in temperature gradient; the effects of nonuniform distribution of thermal load on statistical energy analysis’s parameters of the L-shaped folded plate gradually increase with increase in the average temperature of thermal load.

导出引用

陈强1,2，杨轩2,3，李彦斌2,3，张鹏1,2，吴邵庆1,2，费庆国1,2. 非均匀热载荷对统计能量分析参数的影响[J]. 振动与冲击, 2018, 37(21): 158-164

CHEN Qiang1, 2, YANG Xuan2, 3, LI Yanbin2, 3, ZHANG Peng1, 2, WU Shaoqing1, 2, FEI Qingguo1, 2. Effects of nonuniform thermal load on statistical energy analysis’s parameters[J]. Journal of Vibration and Shock, 2018, 37(21): 158-164

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