Modeling And Simulation Technology Based On FlightLab For Unmanned Helicopter

Unmanned helicopter has characteristics of both manned helicopter and fixed wing unmanned aerial vehicle, so it is used widely, and becoming the hot spot of the study both at home and abroad. At present, some effect has been made in the domestic helicopter flight control system of the engineering tests, but the technology gap with foreign countries is still large. Besides, due to lack of precise dynamic model, not only constrains the design of high-performance control system, but also limits the real-time simulation technology. In view of this, based on small sample unmanned helicopters, this thesis researches the modeling principle and builds high-performance unmanned helicopter dynamic model, which provides reliable model for designing high-performance flight control system and real-time simulation environment.Firstly, this thesis combines sample unmanned helicopter's own characteristics, takes fully into account flightlab software's professional modeling advantage, and models the sample unmanned helicopter by the software. Throughout the entire modeling process, this thesis uses the blade element integral theory to model, which models accurately and simulates well, and focuses on rotor aerodynamic characteristics of modeling mechanism; besides, this thesis models for the components of the sample helicopter.Secondly, model validation is next to helicopter dynamics modeling. This thesis makes use of trim analysis, the rationality of modeling mechanism analysis and the comparison with the flight data to validate the dynamics model of the sample unmanned helicopter. Then this thesis analyses the object characteristics of the model, which provides reliable foundation for flight control system design of sample unmanned helicopter.Thirdly, this thesis improves and perfects semi-physical real-time simulation environment based on flightlab model. Through improving the communication efficiency of nonlinear dynamic model and simulation equipment by shared memory, enhances real-time for semi-physical simulation system. In addition, taking into account the needs of the actual project, the thesis proposes a simplified semi-physical simulation system for outfield scientific flights.Finally, this thesis integrates dynamic model, control and simulation, then validates the system. Simulation results show that the constructed sample helicopter dynamics model has a high accuracy, the improved semi-physical simulation system is more efficient, which achieves research objectives.