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《Journal of Aerospace Power》 2017-06
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Statistical energy analysis considering thermal effect based on FEM-PIM

CHEN Qiang;ZHANG Peng;LI Yanbin;WU Shaoqing;FEI Qingguo;Department of Engineering Mechanics,School of Civil Engineering,Southeast University;Jiangsu Key Laboratory of Engineering Mechanics,Southeast Universing;School of Mechanical Engineering,Southeast University;  
With the combination of the finite element method(FEM)and the power injection method(PIM)under modal coordinate considering thermal effect,a statistical energy analysis method applicable of vibration analysis of complex structures under thermal environment was presented.A simply supported L-shaped folded plate under rain on the roof excitation was studied and the accuracy of proposed method was verified with numerical examples.The influence of thermal effect on the parameters in statistical energy analysis was investigated under three cases:(1)only the material properties were affected by the thermal effect;(2)only the additional stiffness due to thermal stresses was considered;(3)both(1)and(2)were considered.Results showed that the increasing temperature changed the material properties and decreasd the value of coupling loss factor,but had little influence on internal loss factor.The thermal stresses had great influence on the parameters in statistical energy analysis,the increasing temperature decreasd both internal loss factor and coupling loss factor.When both(1)and(2)were considered,the influence of thermal stresses was dominant,the internal loss factor and the coupling loss factor gradually decreased with the increase of temperature.Similar trend was found between the change of modal density and temperature.
【Fund】: 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)
【CateGory Index】: O414.2
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