Department of Mechanical Engineering, National Institute of Technology, Silchar-788010, India.
*Corresponding Author.
the complete four bar mechanism coupler point crank ground link coupler link rocker length of one of the sides of the ternary link length of the line joining A and C angle between the a and d the coupler angle angle made by the link b with the hz. line passes through the point A position vector of the point A, P the relative position of point P w.r.t point A Velocity of point A Velocity of point P Velocity of point P w.r.t point A Acceleration of the point A Acceleration of the point P Acceleration of the point P w.r.t point A Acceleration of the crank Acceleration of the coupler Acceleration of the rocker angle made by the line joining point A and C with the horizontal line passes through the point A. force acting on link 1 due to link 2. force acting on link 3 due to link 2. force acting on link 4 due to link 3. force acting on link 1 due to link 4. torque on link 1 due to link 2. relative position of link 2 w.r.t link 1 relative position of link 3 w.r.t link 2. relative position of link 4 w.r.t link 3. relative position of link 4 w.r.t link 1.
Computer programme and Genetic algorithm is used in analysis and synthesis of a planar four-bar mechanism. Link dimensions were varied to obtain coupler path maps. Position, velocity, acceleration and the force at the coupler point at various input angles were obtained and the designed path is utilized in the working models. Plot of variation of the link angles, variation of velocity and acceleration of the coupler point with the crank angle is obtained. It is found that ratio of velocity of crank and coupler point varies between 4.48 and 0.38, acceleration of the coupler point is maximum. The four bar mechanism can be used to transfer small jobs at regular interval of time. With addition of another four bar mechanism with this, a papad making machine is shown as an useful application.
coupler curves, coupler point, Grashof's law, four bar mechanism
