Dynamic Analysis of a Planar Mechanism With Variable Topology

There is a demand for mechanisms with variable topology (MVTs) that can perform multiple tasks with the least amount of actuators. These devices have the ability to provide numerous motion profiles within one device. In this paper, a specific planar MVT was dynamically analyzed. This mechanism functions as a RRRP mechanism (i.e., slider-crank) in one configuration and as a RRRR mechanism (i.e., crank-crank) in the other. The kinematics and kinetics of the RRRP and RRRR configurations were analyzed with a Lagrangian approach. The resulting equations were coded both in equation form and in Matlab SimMechanics then compared. A method for transitioning between configurations was also developed. These equations could be used to develop an applicable controller and principles for synthesizing future MVTs.