Dynamic Modeling And System Development Of A Coaxial Dual Rotor Helicopter

In aircraft system simulation,helicopter is an unstable system,and its aerodynamic layout affects the performance of the whole aircraft.Aerodynamic coupling should be considered when helicopter rotors rotate at high speed.Helicopter flight simulation needs to consider its reasonable aerodynamic layout and control performance.The general research method is flight test,but due to the limitation of scientific research conditions,this simulation mainly uses aerodynamic modeling.This method is used to simulate the development of dynamic modeling and simulation system for twin-rotor helicopter.In the simulation,the whole machine is divided into several parts,and the corresponding parts are modeled by surface object technology.The aerodynamic model of fuselage part adopts rigid body 6-DOF motion aerodynamic data,and mainly adopts bilinear interpolation method.The upper and lower twin-rotor aerodynamic model of helicopter is mainly based on the single-rotor aerodynamic model.Using blade element theory,first-order dynamic intake model and disturbance factors of upper and lower rotors,the aerodynamic model of double rotors was established.The main principle of helicopter tail aerodynamic model is the same as that of fixed wing.At the same time,the mathematical models of gyro moment,gravity,atmospheric environment and landing gear are established.The helicopter vision system mainly uses OSG and OSGERATH three-dimensional rendering engine.Using VS2010 development platform,using object-oriented technology to write mathematical models.The maps in the simulation scene can display real geographic information.The three-dimensional model of the aircraft is established by using the three-dimensional maximum.In order to make the model true,the low-speed static and high-speed dynamic fuzzy effect of the rotor is adopted,and the OSG node is used instead of the high-speed fuzzy model.The class of the whole program is more computational,and the operation speed is improved by constructing DCOM distributed operation.In the simulation system,in order to optimize the visual effect,an active display system is established.View tracking is realized by using Sony helmet display device.With active display function in OSG,the left and right viewpoints are set to the left and right cutting and rendering state,which corresponds to the left and right channel rendering of the display.Player equipment.Finally,the active stereoscopic display is realized.Active display system can get rid of traditional screen display,make the whole system more portable,and enhance the immersion of the system.The flight simulation system is realized by combining the powerful OSG three-dimensional visualization system with the dynamic model.Through keyboard,remote control rod and helmet display,the flight simulation system is closer to the real object.