The 3-D model is established and is meshed. Then the inner flow field of the poppet valve is simulated at different cone diameter E, different opening positions. Analyzing the result of simulation, the variation curves of cone resistance and steady flow force in different opening of different structure parameters can be obtained. This study for the valve offers the significant reference for designing the valve and optimizing its performance.

Hydraulic spool valve is the key components in fluid transmission and control technology. This paper analyzes flow field of the combination valve based on the CFD software. It gains the characteristic of flow rate and steady flow force, and it offers reference for design of the hydraulic combination valve.

In this paper, the computational formula of field distribution in a coaxial waveguide and the field distribution, resonant frequency and Q factors of open coaxial resonator are introduced. The S21 and the field profile of the TEM mode in a coaxial waveguide, and the field profile and E-field of the mode in a coaxial resonator is gained by the software CST microware studio. The truth that an open coaxial cavity is virtually a slow-varied section coaxial waveguide is gained.

This paper adopts the Computational Fluid Dynamics(CFD) method to analyze the different inner structure of hydraulic poppet valve, under different cone diameter it gains the value of flow characteristic of hydraulic poppet valve in different uncork. And it gives suggestions for the structure design of hydraulic poppet valve.

Port plate is one of the key parts in axial piston motor. The main researching object of this paper is the port plate of axial piston motor. According to different positioning ways of the port plate, the strength of port plate is calculated by the finite element software ANSYS. From the results of the analysis, certain suggestions are also provided to help further positioning ways design of the port plate of axial piston motor.