How to calculate the speed of this umbrella extension arm?

[Throwtex]

TL;DR Summary: Have a university project where we are calculating the speed of the arm at the end.

I need some help on where to start on the calculations. We have tried to determine instantaneous center of rotation for the device. We want to find the linear velocioty of point B. There is a velocity in point A, working vertically. Alle sizes are unknown.

 

[phinds]

TL;DR Summary: Have a university project where we are calculating the speed of the arm at the end.

I need some help on where to start on the calculations. We have tried to determine instantaneous center of rotation for the device.

Given that amount of totally non-specific information, the answer is "probably".

 

[Throwtex]

Given that amount of totally non-specific information, the answer is "probably".

Sorry, updated the posted with more information.

 

[phinds]

Sorry, updated the posted with more information.

I still see exactly what you originally posted. Are you trolling us?

 

[Throwtex]

I still see exactly what you originally posted. Are you trolling us?

No. I attached a pricture of a drawing of the system as well?

 

[erobz]

How did you "try to" determine the IC at the instant shown if all dimensions are unknown?

 

[phinds]

No. I attached a pricture of a drawing of the system as well?

OK, I see it now.

TL;DR Summary: Have a university project where we are calculating the speed of the arm at the end.

We have tried to determine instantaneous center of rotation for the device. We want to find the linear velocioty of point B

I get that you want the upwards (sort of) velocity of point B but what's this about finding the instantaneous center of rotation? Do you mean the center of rotation for point B? Are you trying to find both?At any rate, you'll need to use some geometry/trig/algebra to get an equation for the motion of B relative to V. That will should give you the motion vector for point B. I can't tell for sure by just looking but some calculus may be required as well.

 

[Throwtex]

OK, I see it now.

I get that you want the upwards (sort of) velocity of point B but what's this about finding the instantaneous center of rotation? Do you mean the center of rotation for point B? Are you trying to find both?At any rate, you'll need to use some geometry/trig/algebra to get an equation for the motion of B relative to V. That will should give you the motion vector for point B. I can't tell for sure by just looking but some calculus may be required as well.

We did try to do it with trig and calculus, but that gave us the wrong answear. We wrote the formulas in Python and plotted them and compared to actuall paths on Solidworks. The tutor said we should find all 6 instantaneous center of rotation and try using them.

 

[Lnewqban]

TL;DR Summary: Have a university project where we are calculating the speed of the arm at the end.

I need some help on where to start on the calculations. We have tried to determine instantaneous center of rotation for the device. We want to find the linear velocity of point B. There is a velocity in point A, working vertically. Alle sizes are unknown.

Welcome @Throwtex !

For a constant velocity of slider A, the linear and rotational velocities of point B will change at each instant.
Which one you have been asked to calculate?
With respect to point E or to the ground?

Please, see:
https://en.wikipedia.org/wiki/Linkage_(mechanical)

https://en.wikipedia.org/wiki/Instant_centre_of_rotation

http://www.u.arizona.edu/~pen/ame352/Notes PDF/5.3 Velocity-graphical.pdf

If FD and GE distances are equal, movement of point B should be a magnification of the movement of point D.