Data Acquisition, Processing And Control System For Simulation Of Type-6 Primary Trainer

The avions play an important role in modern war, and the pilots' traininglevel is an important factor that affects the efficiency of the airplane battle.The research for training means of the domestic and international pilotindicates that adopting advanced technique to develop simulation system formilitary airplane can achieve the training effect near to the actual combat andsave a great deal of training outlay, can be free from the influence of theoutside environment, and can make the pilots acquaint with the technique ofhow to drive airplane in a short time. So using flight simulation system totrain airmen is very secure and economical.Simulation technology is a kind of synthetical technology which isbased on the control theory, system theory, similitude principle andinformation technology ,takes computers and special equipments as the tooland uses the system model to carry on the dynamic study of the actual orimaginary system. The flight simulation takes the airplane's movement as theresearch object and aims at the complicated system. First it founds the relatedmathematics model according to the related theories such as aerocraftkinematics, aerodynamics and the principle of flight control, then makesexperiments and analysis based on the mathematics model.The thesis is brought forward for flight simulation training combiningwith the national natural science fund item "the simulation system ofType-6 Primary Trainer" (60273080,60473003) of Air Force AviationUniversity. It mainly aims at the design of virtual meters in simulative flight.The simulator provides an operational training flat for airmen by usingcomputer simulation technology and control technology.The simulation system calculates various parameters of Type-6 PrimaryTrainer according to the mathematics model and the feedback of the positionof manipulative devices such as control stick, throttle,rudder, propeller contorlever, and so on. These parameters drive the relevant virtual aero instrumentsreal-time displaying in graph through a display. The simulator also inflictsdeterminate force on the control stick based on flight speed and the controlstick angle to simulate the stick force. It needs to obtain the position of themanipulative parts quickly and accurately , so the design of data acquisitionand processing sub-system and control sub-system is very important. In thereal-time data collection system, the situation signals of the devices can bequickly, precisely, duly transported to center-control computer, and at thesame time all kinds of control signals created in the computer can betransported to actuators, which make it more vividly in the simulation process.The displacement of the devices in this simulation system is measured bylinear sliding conductive plastic potentiometers, and analog signals of thepotentiometers are converted into digital signals by PCI-7422.Such methodsas scale conversion, digital filtering, zero drift elimination and scale driftelimination are used to process the sampled data. In order to imitate the stickforce, we use a suit of screw/spring device drived by DC(Direct Current)motor to inflict force on the control stick. DC motor is drived by the motordriver which is designed ourselves and can be controlled by the switch signaloutput of PCI-7422 card. Fuzzy control strategy is adopted to control the DCmotor and the system is realized in C language. Now this simulation systemhas reached the expectation and has the advantage of low cost, rapid benefit,security, recyclable usage and no confines of the place and the weather. It canhelp to shorten the training period and improve training efficiencyconsumedly. Currently the emluator has been adopted in reality.The main research work of the thesis is as follows:1. This paper elaborates the background and realistic significance of the itemand recounts the general situation of domestic and international simulationtechnology and computer control technology.2. Giving the architecture and functions of the simulation system anddesigning its hardware and software.3. In this thesis we provide a total design method of the data acquisition andprocessing sub-system and complete the design of hardware and software ofthis part in detail. The design of hardware includes choice of computer,selection and debugging for the data collection card, choice of varioussensors and design for the correlative circuitry. The design of softwareincludes such work as writing the data acquiring and processing program.4. After elaborating the related theory about control system and determiningthe demand and the total design scheme of this control sub-system, we designthe sub-system hardware and the fuzzy controller and then write the controlprogram. Otherwise, we establish a Dynamic Linkable Library(DLL) whichencapsulates the operations of data acquisition and processing and the controlfunction. The DLL provides an interface to the main program and canseparate the software layer and hardware layer. In order to improve generalityand expansibility of the system, we create a configuration file to save theconcerned parameters.5. Analysing the interferential factors in the work process of the dataacquisition and processing sub-system and control sub-system and puttingforward some feasible hardware and software anti-interference measures toincrease the security of the system. Subsequently the experiment results arepresented.6. At last we put the simulation system into meter flight training and monitorall kinds of signals and parameters in the process. The system has beenappraised by advanced pilots. The result proved that this simulation system isstable and has reached the expectation.This text doesn't do the further thorough research to the fuzzy controltheory of the control sub-system and the control sub-system design now stillexists some weaknesses. For example, its capability of anti-jamming is nothigh and its self-adaptation ability is not strong. In addition, the real-timeperformance of the control algorithm also needs to be verified and the designof the control sub-system still have a very big improvement leeway.Moreover, what the system has completed are basal functions and itsfunctions can be expanded. For example, we can add feedback of the rudderforce and other switch signal devices such as electrical gate, various buttonsand knobs to implement other related assistant functions. In this way, we willmake the whole simulation system more perfect.