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In order to achieve the exoskeleton steady,reliable and long operation. Taking exoskeleton principle prototype hydraulic power unit as research object,using the method of Fourier series to establish the exoskeleton kinematics model,analyzing the characteristics of exoskeleton hydraulic system to get hydraulic power unit required heat dissipated power. Establish model of the exoskeleton hydraulic power unit and simulation the thermal of exoskeleton hydraulic power unit in ANSYS to analyze the exoskeleton heat dissipated power and temperature field,bring up an appropriate solving scheme.

Summed up six typical working conditions of the rail track replacement device. Its working load is calculated by three kinds of method. And the theoretical model of telescopic rail track replacement car for work equipment is established.Accelerating factor and inertia weight Improved PSO,and adding the chaos algorithm optimize five main parameters of hexagonal cross-section telescopic boom. The optimization results show,telescopic quality has reduced by 29. 6%; overall centroid position has down; counterweight with telescopic functionis smaller; the balance of front and rear axle bogie track replacement has achieved; In other railcars improved machine stability.