I am struggling to understand where instant center is. I know the first construction line should be vertical along AB since it is perpendicular to Vb. I would then assume that the second construction line would run along DE because that is where it is perpendicular to Vd. I am confused because the IC would be far below the structure. Is this correct?
Once you find that IC is far below the structure, you can use trigonomatry from the 30 degree angle given to find the distances of the IC from B and D.
The problem says to leave your answers for angular speeds in terms of w_ab. Since they don’t give a numerical value for this, you can not find a numerical value for the other angular speeds.
How should we answer part a (where the location of IC_BD is)? Right now I am just saying it is x distance away in x direction from another point. Should I be defining a coordinate system instead?
How do you find the velocity at point D? I have that omega_DE=|v_D|/|r_(D/E)|. Is the velocity of D expressed in terms of the velocity of B so omega_AB can be plugged in?
I am struggling to understand where instant center is. I know the first construction line should be vertical along AB since it is perpendicular to Vb. I would then assume that the second construction line would run along DE because that is where it is perpendicular to Vd. I am confused because the IC would be far below the structure. Is this correct?
Yes, the IC for BD would fall below the mechanism. Not that far, however.
Once you find that IC is far below the structure, you can use trigonomatry from the 30 degree angle given to find the distances of the IC from B and D.
Is it possible to find an actual value for the angular speed?
The problem says to leave your answers for angular speeds in terms of w_ab. Since they don’t give a numerical value for this, you can not find a numerical value for the other angular speeds.
How should we answer part a (where the location of IC_BD is)? Right now I am just saying it is x distance away in x direction from another point. Should I be defining a coordinate system instead?
Show the location in the figure. Provide information of its location relative to some known point.
How do you find the velocity at point D? I have that omega_DE=|v_D|/|r_(D/E)|. Is the velocity of D expressed in terms of the velocity of B so omega_AB can be plugged in?
I assume that you have already found the instant center for link BD. Let’s call that IC point “C”. Here are the steps:
* v_B = |r_B/A|*omega_AB
* omega_BD = v_B/|r_B/C| (CW)
* v_D = omega_BD*|r_D/C|
* omega_DE = v_D/|r_D/E| (CCW)