Interaction between wear processes and limit cycle oscillations of a control surface with free-play non-linearity

作     者：Safi, SA Kelly, DW Archer, RD 

作者机构：Univ New S Wales Sch Mech & Mfg Engn Sydney NSW 2052 Australia 

出 版 物：《PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING》 (机械工程师学会会报；G辑：航空航天工程杂志)

年 卷 期：2002年第216卷第G3期

页      面：143-153页

核心收录：

学科分类：08[工学] 0802[工学-机械工程] 0825[工学-航空宇航科学与技术] 

主　　题：Non-linear aeroelasticity Control surface Free play control surfaces Aeroelastics liquid crystal on silicon depth of wear limit cycle oscillation nonlinearity wear 

摘      要：This paper provides a detailed study of a non-linear aeroelastic phenomenon first addressed by Safi et al., i.e. coupling a model for wear in mechanical linkages to the aeroelastic response of a non-linear wing-aileron or stabilizer-elevator system. The aeroelastic behaviour of these systems with free-play structural non-linearity in the control surface restoring moment is examined. The underlying dynamics and deterioration of the system due to ageing are investigated. Extensive numerical simulations are performed using Wagner s function to evaluate the aerodynamic forces. The resulting equations are integrated numerically to give time histories of the airfoil-aileron motion. Regions of limit cycle oscillations (LCOs) and chaotic vibration are identified well below the linear flutter speed. Finally qualitative and quantitative wear analyses are presented to provide relationships to predict the depth of wear in the mechanical connections experiencing LCOs. The problem is shown to be coupled with an accelerating wear rate as the free play develops.