Abstract
Nonadjustable four-bar linkages can only generate the desired functions precisely at a limited number of points. With one link length adjustment, the whole desired function can be generated precisely. This paper uses the coupler or the driven link length adjustment to generate the desired functions precisely. The synthesis model of adjustable linkages is established based on the optimal link length adjustment. For different applications, the desired functions can be generated precisely by using the continuous adjustment or approximately by fixing the adjustable link at an appropriate length after the adjustable linkage is optimally synthesized. The optimal fixed length of the adjustable link is selected by minimizing the maximum absolute structural error between the generated function and the desired function. The synthesis approach proposed in this paper is verified by two demonstrated examples.
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