Mechanical Behavior of Bistable Bump Surface for Morphing Inlet  

作　　者：张平 周丽 程文杰 

机构地区：[1]State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics and Astronautics

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2015年第6期610-622,共13页南京航空航天大学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.11172128,51475228);the Specialized Research Fund for the Doctoral Program of Higher Education of China (No.20123218110001);the Research Fund of State Key Laboratory of Mechanics and Control of Mechanics Structures (Nanjing University of Aeronautics and Astronautics)(No.0515G01);the Priority Academic Program Development of Jiangsu Higher Education Institutions and the Funding of Jiangsu Innovation Program for Graduate Education(the Fundamental Research Funds for the Central Universities)(No.CXZZ12_ 0139)

摘　　要：There exists inlet-engine match conflict between high and low speeds for a non-adjustable bump inlet.A scheme of using a bistable bump surface at the throat region of the inlet is proposed to adjust the throat area.The FEM model of the bistable surface is established with hinged constraint,and the bistability condition and structural transition process are investigated in detail.Moreover,the effects of loading method,loading position and structural parameters on critical driving force,input energy and structural strain are studied.Finally,the influences of an elastic boundary condition on the structural bistability are discussed.The results show that the bistability of the adjustable bump surface requires a certain boundary constraint and geometric parameter combination,and that there are local and overall snap-through phenomena during transition which are related to the loading position and structural parameters.Therefore,suitable loading position and structural material could reduce input energy and meet the demand of structural strain.There exists inlet-engine match conflict between high and low speeds for a non adjustable bump inlet. A scheme of using a bistable bump surface at the throat region of the inlet is proposed to adjust the throat area. The FEM model of the bistable surface is established with hinged constraint, and the bistability condition and structural transition process are investigated in detail. Moreover, the effects of loading method, loading position and struc tural parameters on critical driving force, input energy and structural strain are studied. Finally, the influences of an elastic boundary condition on the structural bistability are discussed. The results show that the bistability of the adjustable bump surface requires a certain boundary constraint and geometric parameter combination, and that there are local and overall snap through phenomena during transition which are related to the loading position and struc- tural parameters. Therefore, suitable loading position and structural material could reduce input energy and meet the demand of structural strain.

关 键 词：bistable structure inlet-engine match bump surface morphing inlet transition process 

分 类 号：V250.3[一般工业技术—材料科学与工程]