4-Bar Mechanism Displacement Analysis

Input the lengths of the links

fixed link

crank

coupler

output

The mechanis is a crank-rocker since 140+40 < 120+80

angle of the fixed link

start calculating the mechanism displacement

input angle in rad. step each 10 degrees

closure #1

closure #2

closure #1

closure #2

calculate the coordinates of the end points of link #2

calculate the coordinates of the end points of link #2 (closure #1)

calculate the coordinates of the end points of link #2 (closure #2)

Plot the results (end points only). Use polar plots to avoid distortion of the aspect ratio. In polar plot a point is identified using angle and magnitude. Refer all vectors to the same point to get meaningful results.

closure #1

closure #2

Motion over One Cycle
(Two closures)

Plot the results (links). Use polar plots to avoid distortion of the aspect ratio.