Homework H2.G - Fa24

Problem statement
Solution video

DISCUSSION THREAD

Discussion

The animation above shows the motion of the mechanism over a range of input angles of link OA. For a given position, envision the location of the instant centers (ICs) for links AB and CD. Do the directions and magnitudes for the velocities of points B, C and D agree with the location of these ICs?

Shown below is a freeze-frame of the mechanism motion at the position for which you are asked to do analysis. From this figure, where are the two ICs for links CD and BC? In particular, how does the position of the IC for AB relate to the relative sizes of the speeds of points A, C and B? What is the angular velocity of link AB at this position?


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11 thoughts on “Homework H2.G - Fa24”

  1. If two points on a rigid body have parallel velocity vectors with different magnitudes but their tails don't have the same normal line, does that rigid body still have a center of instantaneous rotation? Is such a thing even possible with a rigid body?

  2. As discussed in class, if the perpendiculars of the velocities of two points on a rigid body are parallel but not coincidental, then the body is in pure translational - no rotation. If the parallel lines are coincident, the IC lies along that line.

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