Abstract
This paper presents the design of planar four-bar linkages free of order, branch and circuit defects, for the purpose of path generation, having clearances at one, two, three or all of its joints. Joint clearance is treated as a massless virtual link and its direction is known by the direction of the joint force. A Particle Swarm Optimization based algorithm is given here to solve this highly nonlinear optimization problem with some constraints, namely; the Grashof’s and free of the foregoing defects conditions. An example is included in which the optimal problem is solved for different cases; namely planar four-bar linkage having clearances at one, two, three, all of the joints and without clearance. For all the designs, the generated paths, the errors and the directions of the virtual links are plotted and are compared. Finally, we compare the optimal designs with reality.
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Abbreviations
- a i :
-
Length of ith link
- K i :
-
Position of center of ith link gravity
- r i :
-
Length of ith VJCL joint
- α i :
-
Direction of ith VJCL joint
- β :
-
Structural angle at joint A of the coupler link
- P x :
-
x-coordinate of point P
- P y :
-
y-coordinate of point P
- θ i :
-
Angle of ith link
- \(x_{G_{i}}\) :
-
x-coordinate of the mass center of ith link
- \(y_{G_{i}}\) :
-
y-coordinate of the mass center of ith link
- m i :
-
Mass of ith link
- \(I_{G_{3}}\) :
-
Central moment of inertia of the coupler
- \(I_{B_{0}}\) :
-
Moment of inertia of follower around the axis passing through B 0
- F xij :
-
The x-coordinate of the Joint force acting from ith link to jth link
- F yij :
-
The y-coordinate of the Joint force acting from ith link to jth link
- T in :
-
Input torque
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Appendices
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Sardashti, A., Daniali, H.M. & Varedi, S.M. Optimal free-defect synthesis of four-bar linkage with joint clearance using PSO algorithm. Meccanica 48, 1681–1693 (2013). https://doi.org/10.1007/s11012-013-9699-6
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DOI: https://doi.org/10.1007/s11012-013-9699-6