Abstract：Flow pulsation characteristic is the inherent characteristic of the axial plunger pump, and it is an important factor that affects the working performance and the stability of the hydraulic system. To reduce the flow pulsation of axial plunger pump, theoretical analysis of the motion characteristics and flow pulsation characteristic; The co-simulation model of axial plunger pump was established using ADAMS and AMESim, The influence of different structural parameters on the pulsation of axial plunger pump flow is analyzed by simulation, and the pulsation curves of different plunger diameter, speed and inclined plate are obtained.. The results show that the flow pulsation of the axial plunger pump increases with the diameter of the plunger, the speed and the inclination of the swashplate increases, and the results provide a reference for reducing the flow pulsation of the axial plunger pump.

Abstract：A straight-tube type high pressure air ejection device was studied in this paper, aiming at impacts that structure parameters, gas source characteristics and environmental factors on the interior ballistic characteristics of ejection system and considering the real gas effects of compressed air, an interior ballistic mathematical model of high-pressure-air ejection was established. What's more, the influence law of multiple variables including air pressure, the control valve size and initial temperature to interior ballistic characteristic curves were simulated, calculated and analyzed and it was concluded that these three parameters influence the interior ballistic parameters differently. Finally, it will benefit the missile ejection as these parameters being within a reasonable range and work cooperatively.

Abstract. In view of analyse the theory of calorigenic and heat dissipating, take temperature effects of oil viscosity and density into the thermodynamic model considering a phenomenon that the hydro-pneumatic spring damaged in the bench test by temperature rise too high. Designing a bench test of hydro-pneumatic spring thermodynamic characteristic to test and verify the model. The results show that the calorigenic theory, main heating is holes throttling damping effect; the correctness of hydro-pneumatic spring thermodynamic model is verified by compared the results of simulation and bench test. It provides basis theoretical for further research of hydro-pneumatic spring thermodynamic characteristics.