Optimal Design Of A 3-DOF Driving Platform Of Flight Simulator

6 DOF driving platform of flight simulator is very expensive, and its structure and control characteristics are also complex. Deficient DOF flight simulator driving platform is not only having a cheap price, simple structure and control characteristics, but also can simulate training effect completely. Organization configuration, dimensional synthesis, servomotor parameters estimation and optimization design of key parts of the driving platform are studied in this paper. The main work is as follows:1. 3 DOF driving platform of flight simulator's organization configuration is studied. First, the parallel mechanism configuration of 2R1 T 3 DOF driving platform is studied. And the driving platform structure is determined by future comparative analysis. The driving platform is composed of a moving platform, a static platform, three UPS unconstrained active branch chains and a PU driven branch chain. The driven branch chain is made of pneumatic support unit, which compress gas to bear the weight of moving platform and the main load, reduce the active driving force and the branched chain's section size, and improve the driving platform's safety and the simulation performance. What's more, the driving platform can be extended to 4 DOF hybrid drive platform by connecting with another organization by a prismatic joint serially.2. Dimensional optimization of the driving platform is studied. The simulation performance is presented to be taken as an evaluating index which is based on the vector 2-norm with the aid of the characters of Rayleigh quotient and vector. The influence law of scale parameters to the performance constraints(the stiffness, operating performance) and the simulation performance of the driving platform are discussed through monotonic analysis. It is adopted to seek the optimal solution of the evaluation function. The effectiveness of the method is proved by the example.3. Servomotor parameters estimation. ‘The most evil' situation inverse dynamic model of rigid body is established using the virtual work principle. Servomotor parameter estimation is studied in ‘the most evil' situation of the driving platform based on the inverse dynamic model. The optimal servomotor which meets the requirements is determined and the servomotor parameters are checked by using the plane takeoff process in the example.4. Optimization design and type selection of key parts without servomotor. The main works of this part include choosing the suitable optimal electric cylinder and air cylinder, and designing the structure of the UPS branch chains, the PU branch chain, the static platform and the moving platform.