Conceptual Dynamics - Independent Learning

General Planar Motion - Example Problem 4.3-5

 

Consider the four-bar linkage shown. If link CD is being driven with an angular velocity of 4 rad/s, determine the velocity of point P on link BC and the angular velocity of link AB at the instant shown.

 

 

Given:

  • ωCD = 4 rad/s
  • θ = 40o
  • lBC = 60 cm
  • lCD = 50 cm

 

Find: vB

 

Video solution:

 

The following video walks you through the solution to this problem. It is suggested that you try solving the problem first and then, if you have difficulties with the solution, watch the video for help.

 

 

Interactive solution:

 

Familiarize yourself with the system.
  • Note fixed points A and D.
  • Assign angular velocities.

 

Click on the figure after you have familiarized yourself with the system and drawn a schematic illustration.

 

Find the velocity of joint C using the relative velocity equation starting at joint D.