This thesis presents and summarizes the theory of multi-domain feature mapping in details and provides a basis of the conversion from design domain features to cost domain feature. It studies the current cost modeling techniques based on cost feature, and describes the whole process of cost feature modeling. This thesis lays a foundation for cost estimation.

This paper mainly analyses the force state for upper telescopie prop, down telescopie prop and cylinder of double-telescopie props for hydraulic supports. It builds up the mathematic model for accounting intensity of double-telescopie props, and presents the calculating method of accounting intensity for double-telescopie props.

The paper mainly analyses the vibration of air compressor house in colliery, chooses the reasonable vibration-resistance measures and solving schemes and realizes the design aim in phase. It ensures the nicety of decreasing vibration instrument, damped vibration instrument, the efficiency of vibration-resistance over 80% and vibration speed less than 12mm/s, which reduces the effect of vibration for the surroundings.

This paper mainly has carried on the analysis to the welding performance of high strength steel WH80, through the stretch and the bend test of manual welding rod, arc welding, the slanting y bevel weld crack test and the highest hardness test in welding heat-affected zone. It indicates that the WH80 steel has the good welding performance and is good material for hydraulic support.

This paper mainly has stress analysis on the structure of hydraulic support, the analysis results largely reflect the force characteristics of support. The method using the finite element can deal with the structure strength question that the conventional mechanical method can not deal with and makes the result more safe and reliable.