4 Linkage system: velocity calculation

AI Thread Summary
The discussion focuses on a 4-linkage system and the calculation of its velocity, with several Excel screenshots provided to illustrate the lengths and assembly. The problem is detailed in one of the screenshots, and additional insights are offered through a complete assembly image. A correction is noted regarding the angle θ4, which was mistakenly entered as 0° instead of the correct value of 90°. The user expresses gratitude for assistance and acknowledges the error in their calculations. The conversation emphasizes the importance of accurate input values in mechanical calculations.
vsarnaud
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Homework Statement
I want to calculate the x-vector velocity of the middle leg of the walking machine. This requires two angular velocities. The one from the leg (which I've calculated), and the one from the driver (which I've set to a value, see below).

I can't seem to figure out what the total velocity of this leg is. The program shows me a value (see below) but I can't seem to find an appropriate formula to add both angular velocities together.
Relevant Equations
You could compare this problem to a trebuchet, golfswing or a folded arm that stretches. Where you have two seperate angular velocities resulting in one larger angular velocity.

R1 - R2 - R3 - R4 = 0 (see screenshots)
For the attempt at a solution view the Excel screenshots (1).

A screenshot with all the lengths is provided (2).

The 4-linkage system is shown in screenshot (3).

The problem is shown in screenshot (4).

A screenshot from the whole assembly is also provided to add some insights (5).

Thanks for the help!

(I did not create this 3D model, I chose this project to do calculations for one of my lectures)
 

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Nevermind... I accidently entered the value for θ4 = 0°, but it is equal to 90°...

Sorry for wasting time! :oops:

Kind regards!
 
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