The constituents of 2D parametric graphics and the associated relations of them are discussed;the key techniques,the building and the driving of the structural constraint and the size constraint model are studied;a efficient method is provided for the serialized design in mining CAD.

Based on the theory of coupling and constraint equation, the paper puts forward a Finite Element model (FEM) of metallic hose with the element of Shell93 and Beam189.

Then,the displacement relation between the nodes in one beam is made up by the constraint equation method.

The constraint equations were established at the common boundary section based on plane section premise.

The rationality of end constraint equations on buckling loads of a drillstring in an inclined wellbore is investigated.

In the new approach, the method of regula falsi is used to solve the constraint equations, instead of the conventional linear approximation.

The motion of the rolling disk was analysed to try to explain some unintegrable equations of constraint which is not definitely independent equation of nonholonomic constraint,and the concept of concealed coordinate was proposed.

The equations of constraint are concerted with ideal constraints.

This article analyses the motion of the rolling disk,trying to explain some unintegrable equations of constraint which is not definitely independent equation of nonholonomic constraint,and put forward the concept of concealed coordinate.