Abstract
This paper deals with the dynamic characteristics of an electro-pneumatic hybrid positioning system. This system is composed of a pneumatic, an electric and a mechanical driving sub-system. The pneumatic driving system controls the pressure supporting the inertial mass, which means that the pressure is correspondent to the gravitational force acting on it. And the electric driving system with small capacity moves the inertial mass vertically through a ball screw as a mechanical driving sub-system. In the present study, in order to developing the electro-pneumatic hybrid positioning system, the mathematical model of this system has been refined by comparing calculation data with the experimental results, especially by measuring precisely frictional force of the ball screw. And the power consumption as well as the dynamic characteristics has been investigated numerically when the inertial mass is moved vertically upwards and downwards during one cycle by the electric driving system through the ball screw. The data on the power consumption during one cycle will be useful to select a suitable driving motor at the design stage.
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