Model And Experiment Of3-DOF Helicopter Body And The Electronic Control System

In recent years, the helicopter, as one of the members of the heavy multi-aviationaircraft, is been more and more attention to safe and comfortable, practical andreliable performance. Taking into account the security and economic andenvironmental protection, usually do flight experiments on the helicopter modelsimulation. This saves manpower, financial, material and time, and also provides aconvenient for the research of the key issues and the technology of the helicopterflight control system.Present, there are variety of teaching equipments for helicopter simulationexperiment, and three degrees of freedom helicopter system is one of them. Asexperimental teaching platform of the helicopter control technology, the three degreesof freedom helicopter system is a typical high-end multi-input-multiple outputsystem. Because the system has a strong channel coupling and nonlinearcharacteristics, difficult to use mathematical models to be an accurate description, sothe controlled objects are difficult to handle in the control engineering.The three degrees of freedom helicopter system simulation is mainly based onloop simulation at this stage, experimental study and daily teaching and training of themodel object have dependent on hardware, and lack a more accurate system model. Inorder to better carry out the three degree of freedom helicopter system simulation andfurther study of three-DOF helicopter experimental system’s real-time simulation andreal-time control integration platform, looking for a more accurate system model hasbecome the key issue. In response to this critical issue, the subject has launched aseries of research and exploration. The model usually used today, for three degrees offreedom helicopter system, is only for a single three-axis system of the three-DOFhelicopter, and then linear the equations of motion obtained. Different from above,this paper does theoretical modeling for two parts of three degrees of freedom of thehelicopter body and electric control system, expects to achieve to eliminate orimprove the motor control problems, which is not accurate in the part of the systemdescription, or is easily overlooked due to the electronic control system modeling.The body part considers some of the factors of the three degrees of freedom, respectively discusses the three degrees of freedom kinematic equations and thedifferential equations of the motor. Finally, get a more complete system of bodymathematical model of the combination of both.Some of the major electronic control system is the motor speed control system,and the key link of DC PWM speed control system. This paper explores severalfactors that affect the system, accurate improves their mathematical model. Verify theaccuracy of the theoretical derivation, inspection and correction the model formulathrough the use of the intuitive and experimental experiment provide relevanttheoretical and empirical data for further research work in the future.