Basic Research On Structure And Driving Of Morphing Wing

Having an extremely promising application prospect in the military and the civilfield, bionic morphing wing air vehicle becomes a hot research spot at home and abroad.Compared to the fixed-wing and the rotary-wing air vehicle, bionic morphing wing airvehicle has the superiority, which will certainly occupy an important position in this fieldand have great significance in developing aerotechnics.Some related design problems about bionic morphing wing air vehicle has beenstudied in this paper. The main work is as follows:Firstly, embarking from the category of flying creature, with the characteristics offeather and membrane wings learned, flight associated stucture and function studied,enlightenments of bionics to variant wing design ere summarized from aspects ofappearance and attitude, drive mechanism and materials.Secondly, according to the characters of birds geometrical shape and flight attitude,by controlling the range of joint degrees of freedom and stability requirements,aerodynamic analysis and optimization of posture were carried out under task profiles ofcruise, climbing and diving, thus obtaining three task status of joint configuration andaerodynamic characteristics. Then the importance and feasibililty of condiguration jointsin actual aricraft disign was analyzed to determine the variation strategy. It came out thatvariable sweepback and variable trailing edge were effective and feasible ways of bionicvariant.Then, a kind of joint driver was designed based on shape memory alloy (SMA)materials working as volute spiral spring. Offset the SMA volute spiral spring to realizethe force output and wing variant. Basic mechanical performance of driving material andthe influence of heat treatment parameters are studied to find out the proper heattreatment program. After manufacturing and testing the driving element, the offset springcan be choosen accordingly. The performance of the actuator was tested whenassembling finished.At last, ionic polymer metal composite (IPMC), a kind of soft actuator imitatingwing membrane was studied. On the base of successfully preparing of Ag-IPMC,influences of preparing temperature to performances of Ag-IPMC were studied. The wingmembrane related tensile charecteristc and driving perfrmance under DC and AC of Ag-IPMC are studied. This research gives the reference to optimization of IPMCpreparation under different application requirements. Meanwhile, it providesexperimental basis of IPMC material in membrane bionic wing variant design andimplementation.