Research On No-Surplus-Torque Servo Load Method

Load simulator is a hardware-in-loop simulation device which is used to simulate aerodynamic load experiments for the rudder of aircraft in laboratory conditions. When the load simulator works, the movement of rudder causes the surplus torque, which seriously affects tracking accuracy of load spectrum. In this paper, a servo load method which does not generate surplus torque is proposed, and its design and research are carried out, which includes the following aspects:Firstly, the traditional load simulator is analyzed, and the mathematical model is built based on its mechanism. The generation and influence of surplus torque are simulated. Through the simulation analyzing of the surplus torque, we can see that the existence of surplus torque greatly reduces the loading performance of system.Secondly, a servo load method which does not generate surplus torque is proposed to follow the spectrum of the servo system, the mathematical model is built through studying and analyzing its working principle and feasibility. And using the classical PID control method, the simulation of the loading method is carried out under the static torque command and the dynamic torque command.Then, aiming at the shortage of traditional PID control method when the mathematical model of the servo load simulator is inaccurate, or existing parameter time varying and nonlinear problem. Analysis and design the adaptive fuzzy PID controller, combined with the mathematical model, to explain the adaptive fuzzy PID controller in the loading system is effective.Finally, the system solution of the servo loading method which does not generate surplus torque is designed, including the design of upper computer software, the lower computer software process and the control board hardware circuit.