Design And Research Of Force Loading Control System Based On DSP And FPGA

The force loading system is one of the crucial subsystems of the aircraft flight simulatorcontrol system which turns the instructions of pilot to the electrical signal to realize the rollingand pitching control of aircraft. With the development of electronic technology and thecontinuous improvement of the aircraft technology, it is particularly urgent and important toimprove the performance of the aircraft driving stick. The active side stick control system canimprove the control quality of the aircraft flight simulator effectively and achieve the forceloading with the high fidelity. Therefore, it is of great significance to master the active sidestick control technology of the aircraft and to achieve the high fidelity of the sense of forcesimulation.This thesis designed the hardware architecture and software architecture of the forceloading control system by analyzing the functional requirements and technical performancerequirements of this control system. The control strategy of this thesis was determined bystudying intensively on the mathematics model and the major technology of the force loadingcontrol system. A composite control method based on the feedforward control and theslide-mode variable structure control is used to realize the control for the entire force loadingcontrol system. The relevant controller was designed and the simulation was done. The resultsshow that it can achieve the force loading control effect with a high fidelity by using thecomposite control method based on the feedforward control and the slide-mode variablestructure control.According to the mechanism and the functional requirements and technical performancerequirements of this control system, the hardware of force loading control system is designed.The structure of motherboard is adopted. Signals among the control board, signal processingboard, drive board are connected by the motherboard. The DSP(Digital Signal Processor) andFPGA(Field Programmable Gate Array) double management framework is used in the controlcircuit. The advantages of DSP in motors control and parallel processing of FPGA are playedfully. In this way, the function of hardware platform is perfect and easy to expand. Theprecision operational amplifiers are used in the signal processing section, so that it can workstably in complex environment. Three-phase bridge inverter circuit is adopted in the drivecircuit. The MOSFET(Metal Oxide Semiconductor Field Effect Transistor) drive circuit isconstituted by a dedicated drive to improve the reliability of the system and reduce the circuit.The control tasks of DSP and FPGA are divided by the functional requirements of thiscontrol system and the advantages of DSP and FPGA. Control flow charts are designed, too.At last, every function of force loading control system is tested both on software and hardware platform. The test results show that DSP and FPGA work together can achieve theforce loading with the high fidelity and ensure the safety and reliable operation of the system.