基于FEM-PIM计及热效应的统计能量分析

发布时间：2018-02-02 16:35

本文关键词： 统计能量分析热效应功率输入法内损耗因子耦合损耗因子　出处：《航空动力学报》2017年06期 　论文类型：期刊论文

【摘要】：结合有限元法(FEM)和模态坐标系下计及热效应的功率输入法(PIM),给出一种热环境下适用于复杂结构的统计能量分析方法.以各边简支的L型折板为研究对象,开展雨流载荷作用下的数值模拟验证方法的准确性.开展3种工况条件下热效应对统计能量分析参数的影响研究:(1)仅考虑热效应引起的材料力学性能变化;(2)仅考虑热应力引起的附加刚度效应;(3)同时考虑考虑两者影响.结果表明:温升影响材料力学性能的同时会导致耦合损耗因子减小,但对内损耗因子的影响不大;热应力引起的附加刚度效应对内损耗因子和耦合损耗因子的影响较大,两者均随温度的升高而逐渐减小;同时考虑两者影响时,热应力对统计能量分析参数的影响占主导地位,内损耗因子和耦合损耗因子均随温度的升高而逐渐减小;模态密度与温度的变化趋势基本一致.
[Abstract]:In combination with the finite element method (FEMM) and the modal coordinate system, the power input method (PIMM), which takes into account the thermal effect, is used. A statistical energy analysis method for complex structures in thermal environment is presented. The L-type folded plates with simply supported edges are taken as the research object. The accuracy of the method is verified by numerical simulation under rain load. The study on the influence of Thermal effect on the parameters of Statistical Energy Analysis under three working conditions: 1). Only considering the change of mechanical properties of materials caused by thermal effect; (2) considering only the additional stiffness effect caused by thermal stress; The results show that temperature rise affects mechanical properties of materials and leads to the decrease of coupling loss factor, but has little effect on internal loss factor. The additional stiffness effect caused by thermal stress has a great influence on the internal loss factor and coupling loss factor, both of which decrease with the increase of temperature. At the same time, the influence of thermal stress on the parameters of statistical energy analysis is dominant, and the internal loss factor and coupling loss factor decrease with the increase of temperature. The variation trend of modal density is basically consistent with that of temperature.
【作者单位】：东南大学土木工程学院工程力学系;东南大学江苏省工程力学分析重点实验室;东南大学机械工程学院;
【基金】：国家自然科学基金(11572086,11402052) 教育部新世纪优秀人才支持计划(NCET-11-0086) 江苏省自然科学基金(BK20140616)
【分类号】：O414.2
【正文快照】： 引用格式:陈强,张鹏,李彦斌,等.基于FEM-PIM计及热效应的统计能量分析[J].航空动力学报,2017,32(6):1366-1374.CHENQiang,ZHANG Peng,LI Yanbin,et al.Statistical energy analysis considering thermal effect based on FEM-PIM[J].Jour-nal of Aerospace Power,2017,32(6):1

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