Design for decreasing running resistance of crawler tracking of mining equipment underground;

Analysis and calculation of running resistance of long distance belt conveyor;

A new calculating method of the scraper conveyor running resistance;

Utilizing the electristic-bag preciptater simulation experimental system,under many experimental conditions(the density of dust,the thickness of dust on bag surface,the blowing pressure of bag house preciptater and blown time) the experimental study on the operation resistance of electristic-bag precipitater was carried out.

On the basis of the research method with combination of two calculation modes of the automobile running resistance and train operation resistance,the theoretical formula of curve additional resistance is derived for the straddle type monorail vehicles.

To verify the feasibility of this kind of Pigs,the operation resistance of the Pig was measured and compared with that of traditional Pigs.

Based on the analysis of the mechanism on the tubing-rod wearing in detail, a novel design of low friction sucker pump has been developed recently which can reduce the rods' friction in down stroke effecti.