Research On Compensation And Implementation Of Transport Delay In Flight Simulator

Flight simulator is a typical human-in-the-loop simulation system. As a kind of training equipment, compared with training driver by using real airplane, flight simulator have some advantage in reducing flight time, reduction of fuel, no limited in place and climate and improving training efficency. Our nation falls much behing other countries on the flight simulator development,our government promotes the project of big aircraft, the corresponding flight simulator is needed, so the research on simulator is emergent. Flight simulator transport delay research is one of the key technologies of improving fidelity of flight simulator. Therefore, the analysis of transport delay effection and compensation method research have the very important meaning to develop and exploit the D class flight simulator and accumalate enrich reaserch experimence.After consulting numers related literatures and reference materials at home and abroad, the situation and trend of domestic and oversea is summartzed in this paper. Flight simulator transport delay measurement and compensation method are summarized ,the difference in the domestic and oversea is depicted. All kinds of pilot control strategy models are introduced briefly. Moreover, the structure and subsystem function of flight simulator are analysed detailedly. On that basis, the reason of transport delay is obtained. That lay a good foundation for the next reaserch.In the real flight trainning, the pilot control strategy is changed from acquisition control to tracking control. The objective of the tracking control is maintain the system state variables on the tracking control switching surface. To achieve it, a sliding optimal control method is proposed, it can drive system state on the sliding surface from the beginning of the motion. A parameter selected method of weighting matrix on H∞control is improved, the weighting matrix of linear quadratic optimal control is calculated by it. To drive the system state variables to the acquisition control switching surface in minimum time, the acquisition control strategy is builed by sliding model control.The main error is regared as a judgement from acquisition control strategy to tracking control strategy. The results imply the pilot variable stategy control model conforms to the real pilot control characteristic.The pilot control model is combined with roll motion sensing model and linear motion sensing model of pilot vison and vestibular and the flight simulator model,the pilot and flight simulator integrated model is proposed. It incorporates the nonlinear interaction between the visual and vestibular and can help the simulator designer to evaluate the transport delay effct on the handing qualities and to design high fidelity flight simulator.The transport delay effect on the moved based flight simulator and the fixed based flight simulator is analyzed. The delay sensitivity on moved-based flight simulator is larger than on the fixed-based flight simulator ,the relation of the delay with effect is approximate linear, the miton cue delay increases the visual cue delay effect. In theory, why does the compensation algorithm mainly compensate the visual cueing is explained.In order to offset the lack of the improved McFarland compensation algorithm ,improve compensation ability and reduce the large forecasting error, the adative weight factor is proposed. Through using the iterative least square with forgetting factor, the adaptive real time weigh recurrence least square McFarland algorithm and the adaptive interation least square McFarland algorithm are proposed. The singularity of the initial value is solved in the improved McFarland compensation algorithm.The results imply the error accumulation and delay change sensitivity of two proposed algorithm are smaller than the improved McFarland compensation algorithm and the adaptive interation least square McFarland algorithm is the most excellent among the three algorithms.Transport delay must be measured before the compensation algorithm is appllied.The realization method which inclueds the projector delay is accomplished by using the high photosensitivity photo transistor and flight control computer. The transport delay on the independent research B737-800 flight simulator is measured, the average and maximum value is obtained.To verify the compensation algorithm,the flight simulator automated test and evaluation system is implemented. It evalues the compensation algorithm by using fidelity.It consist of the test item file, file translator, execute procedure, and results analysis. Different of other flight simulator test and evaluation systems, the system involves the specfic realization process and algorithm.Finally,the flight simulator compensation algorithm and the flight simulator automated test and evaluation system is executed on the independent research B737-800 flight simulator,the results imply the flight simulator fidelity conforms to the flight simulator performance standard. It inllustrates that the compensation algorithm is correct and the test and evaluation system is feasible...