FEM Analysis Of Telescoped Morphing Wingand Hydraulic System Design

Modern aircraft faces different kinds of missions, which require differentperformance and layout of the aircraft. With increasing demand of flight efficiency,mobility and multi-tasking ability of aircraft emerged, morphing aircrafts have risen awide range of interests in academia and the aerospace industry recent years. Generallyspeaking, morphing aircraft is able to change its shapes in flight, in order to adapt toaccommodate flight environments and to fulfill various tasks. This quality effectivelyimproves maneuverability and flight performance.This telescoped morphing wing is one typical kind of morphing wings, whosemain aim is to change its wingspan and wing area in order to accommodate multipleflight conditions, therefore the characteristics of such adaptive aircraft with thistelescoped morphing wing change great. When the moveable wing stays static, theaircraft’s characteristics is mainly determined by the traditional fixed wing, and at thismode, aircraft can obtain higher flight speed than it is fully extended. When themoveable wing is stopped at the most remote place, aircraft can get a lower speed andlarger elevating power.In this paper, a kind of telescoped morphing wing is mainly studied and fourdifferent parts are conducted to illustrate my research in detail and shown as follows:Chapter2applies Finite Element Method to get a better insight into telescopedmorphing wing. Aimed to make an adequate prediction on the unique characteristicsof telescoped morphing wing, the static analysis, modal analysis and harmonicresponse analysis are conducted after establishing the3.D model of telescopedmorphing wing. This work is based on FEM through software ANSYS, the detailedresults obtained include the distribution maps of the deflection and stress, the lowerinherent frequencies and vibration shapes and the curves of harmonics responseanalysis, which provide reliable evidence for the further research and analysis.Chapter3The third chapter focuses on the application of hydraulic transmissiontheory, has studied the design requirements of hydraulic system for telescopedmorphing wing, determined the main parameters of hydraulic system for telescopedmorphing wing; designed the hydraulic ram of hydraulic system for telescopedmorphing wing; made plan about hydraulic transmission system of hydraulic systemfor telescoped morphing wing; finished checking computations and structure designon the transmission characteristics of hydraulic system for telescoped morphing wing.The hydraulic control system of telescoped morphing wing has been designed in chaper4and the main content include drawing the signal flow graph and theschematic diagram system of electro-hydraulic proportional control; designing andrealization of electro-hydraulic proportional control system of telescoped morphingwing; selecting the control method for electro-hydraulic proportional control systemand programming language; choosing the core proportional control elements in theelectro-hydraulic proportional control system-reversing valve, proportional throttlevalve and proportional relief valve and confirming the model and specification of theelectro-hydraulic proportional control system for telescoped morphing wing.In Chapter5, at the beginning, structure design of some important points areintroduced in detail and the overall design of this telescoped morphing wing is alsocompleted. The base, wing and transmission system are three most importantstructures, firstly, the base is designed to bear gravity of wings and transmissionsystem; secondly, according to the differences that whether it can move or not, wingsare defined by movable wing and fixed wing, all of which are key parts of thistelescoped morphing wing; thirdly, motor, bevel gear group, screw and moveablewing consist the transmission system. And then Software, Impact Testing and ModalAnalysis, which are included by LMS Test. Lab, is used to conduct experimentalmodal analysis based on hummer testing. Different mode shapes of3different statesare calculated.In this thesis, finite element analysis of telescoped morphing wing, design ofhydraulic system, design of electro-hydraulic proportional control and experimentalmodal analysis of telescoped morphing wing have gained objective simulation results,the detailed design scheme and accurate experimental data, which are considered tobe very important for further relevant study.