In this paper the static and dynamic characters of the pump are analyzed;especially the static characters by resistance control analysis method is analyzed successfully.

The resistance analysis of the electrorheological intelligent damper;

SEM images showed that contaminants were mainly concentrated on the surface of nonwoven material,which contributed to the reversibility of fouling considering the result of the membrane resistance analysis.

The calculating method for determining the pipe diameter by flow speed control method was introduced, calculating example for determining the pipe diameter by flow speed control method and resistance control method was listed respectively.

Based on energy conversion philosophy during flow process of fluid in pipe, calculating formula for determining pipe diameter by resistance control method is derived, the most direct relation, of energy loss during fluid's flow process inside pipe versus designing pipe size, has been established in order to determine pipe size by controlling the pipe resistance.