The motion of complex planar mechanism can be regarded as the synthesis of a series of rotational motion round the points of relative turning centroid, and the envelope of swept area is constructed by connecting the periphery of simple circles with segments of the outer boundary of moving components.

Application of Object ARX technology in curve generation by sweeping over regional boundary;

Solution of three-dimensional solid swept volume by projective method;

A method to solve this problem is setting up geometricmodels of mobile objects, which is defined as “swept volume” (or “scanningvolume”).

According to analysis on characteristic of sweep problem, a detail algorithm for generating the swept area of planar object is addressed on the base of research on various factors concerned generating the swept area of planar object.

It is found that in the process of burst event, while ejections and sweeps occure in a turbulent boundary layer, the local scaling exponent is negative.

The paper introduced the methods to check automobile windshield wiper clean rate by 3D parametric CAD system,a passenger car demonstration constructed by the method,driver s eyellipse has been located,and windshield wiper clean area was defined,check of wiper clean rate has been processed.