COMPUTER-AIDED SYNTHESIS OF LINKAGE-TYPE STRAIGHT-LINE AND DWELL MECHANISMS

摘要

The synthesis of the four-bar mechanism has received a substantial amount of attention in the area of straight-line mechanisms. Various geometrical and analytical methods have been developed with numerous papers published in this area over the past few decades. Three primary methods are generally available for synthesis of the linkages. The first approach is the classical Burmester finite separated position synthesis technique. The precision points are assigned for describing the desired straight-line motion [Mahyuddin etc. 1986; Shagan, Fallahi and Lai 19891. The second approach uses the mathematical programming technique for finding the optimal solution which mimimizes the error between the desired straight line and the real tracing points of a linkage [Hwang and Hsiao 1989; Hwang and Lee 19871. The third approach is based on the curvature theory. Any point on the inflection circle generates an approximate straight-line motion. A series of design charts was set up by Vidosic and Tesar [Vidosic and Tesar 1967) as the basis of synthesizing the mechanisms. However, the direction of the coupler point has generally not been controlled. The constraint was taken into consideration by Hsu [Hsu and Lee 1990].