Research On Essential Technology And Principle Prototype Development Of Control Loading System In The Simulator

This dissertation is written by in purpose of developing civil flight simulator and filling up the gasp of scientifical fields of civil aviation of China. In view of the key technical problem in developing process of control loading system of flight simulator, sponsored by Ground Special Equipment Study Base of CAAC and Electro-hydrualic Servo Simulation and Test System Institute of HIT. This dissertation mainly deals with software and hardware design, force control strategies, restraint of extraneous force, friction effection and compensation of the control loading system. The functions and performances of the system are verified by flight-test and experts'argumentation. The main contents and contributions of this dissertation are listed as follows:(1) Revealing the basic characteristic of control loading system, arguing about the concept of extraneous force, analyzing the mechanism of production of extraneous force and the impact factors of extraneous force by different steps.(2) Putting forward the force simulation of control column (panel or step) by three piecewise-linear models, with the result that the simulating effect of the simulator on principle is very close to the reality fight. Setting up the mathematic model of control loading system, comparing three control manners (position loop, velocity loop and force loop) by which the electro-hydraulic servo control can be carried out, and showing that the force loop control achieve the best performance to track the real time force. At the same time modelling the redundancy force and analyzing the impact factors.(3) Aimed at the friction existing in hydraulic cylinder in control loading force hydraulic force servo control system, putting forward an universal friction model of double-acting cylinder, putting forward using the control strategy of fuzzy adaptive PID+feed-forward to restrain the friction's effect to track precision and time lag. The result of simulation had validated its validity, decreasing track error greatly.(4) Putting forward a kind of real time control simulation which hardware is industrial personal computer and software is operating system of QNX +RT-LAB+MATLAB. Researching and designing the software & hardware architecture of the control loading system, fulfilling the flight simulator's desire to real time and fidelity of the control loading system.(5) Putting forward a kind of control strategy which main passage is fuzzy adaptive PID control and which sub passage is learnable feed-forward control. This method is improving on the feed forward compensation, and adaptive to nonlinear of system and real-time parameters. It alters the feed-forward parameters to restrain the extraneous force better.