This paper deals with the synthesis of planar and spherical adjustable fourlink mechanisms whose coupler point can approximately trace two or more paths prescribed by a large number of points. A single adjustment in one of the mechanism parameters is used to approximately obtain the prescribed paths. A two stage approach is used to first determine the parameters of the driving dyad and then the parameters of the driven dyad. The use of novel and appropriate objective functions with minimum number of variables and a sequential quadratic programming (SQP) algorithm to search for the optimal mechanism parameters leads to quick and accurate synthesis of the four-link mechanisms.
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