Based on CAD the geometric constraint and dimension driving techniques

a dynamics analysis approach for planar mechanism is presented.By using the geometric-constraint

dimension-constraint

dimension equation-constraint

and dimension driving in CAD software

some type of simulation planar mechanisms are created.The driving dimension of input linkage is given and modified

and the driven dimensions of output linkage are changed automatically.Based on actual work load and mechanism characteristics

simulation model for mechanical analysis is constructed

the load of hinge point and input-driven is found critical load data curve is attained by using the record function of CAD software.The results of computer simulation and fit equation prove that the geometric constraint and dimension driving mechanism simulation approach has not only fairly quick and straightforward

but also advantages of accuracy and repeatability.