Research On Structural Design And Control Strategy Of Aircraft Active Side-stick

With the development and mature application of Fly-By-Wire(FBW)system for aircraft,many advantages of the side-stick system have become increasingly prominent,driving handle devices of modern advanced aircraft have gradually evolved from traditional central steering rod/wheel to sidestick devices.Comparing with Passive Side-stick System(PSS)with single force feedback characteristic,Active Side-stick System(ASS)whose force feedback characteristic can be changed according to the change of aircraft flight state will become the mainstream of future aircraft driving handle system.Therefore,the design of Active Side-stick Device(ASD)which meets the requirements has become the primary task of realizing ASS functions.In this paper,based on the research project of the active side-stick of the next generation fighter in an institute of AVIC,taking ASD as the research object,aiming at designing ASD that meets the requirements,the mechanical structure design,mechanical characteristics analysis,structural optimization,control strategy of ASD and other aspects are studied in detail by means of the combination of three-dimensional digital design software SolidWorks,finite element analysis software Workbench,Simulink simulation platform and experimental verification.The main contents are as follows:(1)Combined with the working principle of ASS,the function of ASD is analyzed in detail.According to the requirements,the advantages and disadvantages of force loading actuators and transmission schemes are compared and analyzed,and the appropriate force loading actuators and the overall transmission scheme are selected.(2)Aiming at the problem that the pitch and roll directions of ASD need to be independent,a control isolation mechanism based on three degree of freedom gyroscope frame structure is proposed,which can isolate pitch and roll operations by installing a roll rotor inside the pitch axis.In order to ensure the reliability of ASD,an active and passive working modes switching mechanism based on electromagnetic clutch is designed.The main parts in ASD are determined,and the key parts are calculated and checked in detail.(3)Using SolidWorks to build the three-dimensional model of ASD.In order to ensure that the designed device can meet the requirements of mechanical characteristics,the corresponding static and dynamic characteristics analysis of the control isolation mechanism and the frame are carried out in Workbench.In view of the structure that does not meet the requirements,the direct optimization module is used to optimize the single objective.Aiming at the problem of overall lightweight of ASD,the lightweight design of the frame is carried out by using Shape Optimization module and Response Surface Optimization module,combining the method of topology optimization and multi-objective optimization based on response surface method.(4)Combined with the designed ASD,the three closed loop position servo control strategy and the compound correction force servo control strategy based on double closed loop are designed.The control strategy is simulated and analyzed in Simulink.Finally,in order to verify the rationality of the force servo control strategy,the force tracking test of the ASD prototype is carried out.Experiments show that the designed force servo control strategy can ensure that the system can track the curves of force model well.The results show that the mechanical structure of ASD designed in this paper can meet the functional requirements and the static and dynamic characteristics.At the same time,through analysis and optimization,the lightweight design of the device is realized.The control strategy of the actuator designed can meet the requirements of tracking accuracy and rapidity of the system.The research results of this paper can provide some theoretical reference for the research of ASS in China.