Reliability of Hypersonic Airfoil with Freeplay and Stochasticity via Nonlinear Energy Sink

作     者：Guo, Weili Xu, Yong Liu, Qi Lenci, Stefano Li, Guangning 

作者机构：Northwestern Polytech Univ Sch Math & Stat Xian 710072 Peoples R China MOE Key Lab Complex Sci Aerosp Xian 710072 Peoples R China Tokyo Inst Technol Dept Syst & Control Engn Tokyo 1528552 Japan Polytech Univ Marche Dept Civil & Bldg Engn & Architecture I-60131 Ancona Italy Northwestern Polytech Univ Sch Astronaut Xian 710072 Peoples R China 

出 版 物：《AIAA JOURNAL》 (美国航空航天学会志)

年 卷 期：2024年第62卷第9期

页      面：3258-3270页

核心收录：

学科分类：08[工学] 0825[工学-航空宇航科学与技术] 

基　　金：National Natural Science Foundation of Chinahttp://dx.doi.org/10.13039/501100001809 National Natural Science Foundation (NSF) of China Key International (Regional) Joint Research Program of the NSF of China China Scholarship Council 

主　　题：Hypersonic Aircraft Mechanical and Structural Vibrations Structural Reliability Analysis Aircraft Wing Design Aerodynamics Probability Density Functions Nonlinear Energy Sink Reliability Design Random Fluctuation Aeroelasticity 

摘      要：The reliability of a pitch-plunge hypersonic airfoil in random fluctuating flow with both cubic and freeplay nonlinearity is examined. The Hopf bifurcation and dynamic responses of the hypersonic airfoil are performed. To analyze the reliability, the effects of stochasticity on the dynamic behaviors of the hypersonic airfoil model are discussed in detail. Several unwanted phenomena that result in the failure of the airfoil structure are induced by random fluctuations. Subsequently, the reliability of the airfoil model is defined and analyzed according to the first passage failure criteria. The effects of different parameters on the reliability are investigated. Furthermore, a nonlinear energy sink is introduced to suppress the vibration of the airfoil and enhance the reliability. Two-dimensional reliability regions of the airfoil model are given to provide the safety parameter region. The results show that the reliability of the airfoil model is significantly improved with the nonlinear energy sink. This work will provide new insights into the safety design of hypersonic aircraft.