非均匀热载荷对统计能量分析参数的影响

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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.

Key words： statistical energy analysis thermal effect nonuniform thermal load internal loss factor coupling loss factor

Received: 23 June 2017 Published: 28 October 2018

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	Articles by authors
	CHEN Qiang1
	2
	YANG Xuan2
	3
	LI Yanbin2
	3
	ZHANG Peng1
	2
	WU Shaoqing1
	2
	FEI Qingguo1
	2

Cite this article:

CHEN Qiang1,2,YANG Xuan2, et al. 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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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2018/V37/I21/158

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