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Through theoretical analysis of a suspension mechanism used for aircraft recovery vehicle, the mapping relationship between the hydraulic cylinder axial force and scale parameters of the suspension mechanism was built. With coordinate values of each hinge joint of the suspension mechanism in the initial position as design variables, the minimum hydraulic cylinder axial force was taken as evaluating index with reasonable constraints and optimal design of the hydraulic suspension mechanism was studied. The influence law of scale parameters to the axial force was discussed and coordinate alternation method was applied to find the optimal solution. The effectiveness of the method was indicated by an example.

A novel 4-DOF hybrid driving platform of flight simulator is presented. Its main load born by a PU limb which composed of pneumatic support unit, so the driving force, the safety and the simulation performance are all improved. The simulation performance is proposed to be taken as the evaluating index. Dimensional optimization of the driving platform is studied with the aid of the characteristics of Rayleigh quotient and vector. The influence law of scale parameters to simulation performance and constraints is discussed through monotonic analysis and it is adopted to seek the optimal solution of the simulation performance. The effectiveness of the method is proved by the example.

The traditional method of finite element that fixing constraint between suspension and chassis for the damaged aircraft recovery trailer chassis usually ignored the buffer function of suspension leading to too much stress, So aiming at that problem The constraint of trailer is fixed by the method of balance frame system. Based on FE-software ANSYS the FE module of trailer chassis and balance frame system is set up and their node is coupled by the force analysis of aircraft with half of fuel in damaged. It's result that the maximum stress is less than permissible stress.The result show that the method of balance frame system is more practical by computer simulation.