非均匀热载荷对统计能量分析参数的影响  

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

作　　者：陈强[1,2] 杨轩[2,3] 李彦斌 张鹏[1,2] 吴邵庆[1,2] 费庆国[1,2] CHEN Qiang;YANG Xuan;LI Yanbin;ZHANG Peng;WU Shaoqing;FEI Qingguo(Department of Engineering Mechanics,Southeast University,Nanjing 210096,China;Institute of Aerospace Machinery and Dynamics,Southeast University,Nanjing 211189,China;School of Mechanical Engineering,Southeast University,Nanjing 211189,China)

机构地区：[1]东南大学工程力学系,南京210096 [2]东南大学空天机械动力学研究所,南京211189 [3]东南大学机械工程学院,南京211189

出　　处：《振动与冲击》2018年第21期158-164,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(1157208; 11402052);江苏省自然科学基金(BK20140616);江苏省研究生科研与实践创新计划项目(KYCX17_0054)

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。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,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。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.

关 键 词：统计能量分析 热效应 非均匀热载荷 内损耗因子 耦合损耗因子 

分 类 号：V414.8[航空宇航科学与技术—航空宇航推进理论与工程] O32[理学—一般力学与力学基础]