Research On Fidelity Evaluation Methodof Flight Simulator Motion System

The flight simulator needs to realize flight tasks under various complicated conditions in the use phase,thus meeting the requirements of flight training and teaching.As one of the important components of flight simulator,the motion system needs to provide more real motion characteristics for pilots.In this paper,the following research is carried out on the fidelity evaluation method of the flight simulator motion system:Firstly,the methods of fidelity evaluation at home and abroad are investigated and analyzed.In order to further understand and standardize the application of evaluation methods,the relevant provisions of simulator evaluation under the existing airworthiness regulations were studied.On the basis of airworthiness regulations,the use of standardized evaluation methods has laid a theoretical foundation for further closed-loop fidelity evaluation of flight simulators.Secondly,two closed loops of pilot-aircraft and pilot-simulator are established,and the fidelity evaluation scheme is studied based on the closed loop.In order to establish a complete evaluation loop,the following work has been done: determine the composition of the closed-loop simulation loop and the fidelity evaluation index,and obtain the fidelity calculation method through the evaluation index.In order to realize the establishment of the closed loop,modeling and simulation are carried out on each component module in the closed loop,including a pilot model,an aircraft dynamics model,a washout algorithm model and a six-degree-of-freedom platform model.The identification method of unknown parameters in pilot model is studied.The washout algorithm and the six-degree-of-freedom platform model are verified to provide the basis for establishing a closed loop.Finally,on the basis of completing the above steps and verifying the accuracy of the model,two flight missions are selected and a complete pilot-aircraft and pilotsimulator closed-loop is established,and complete the parameter identification of the unknown parameters in the pilot model and use the evaluation index to calculate relevant results have finally achieved the evaluation of the fidelity of the motion platform.