How Can I Use Complex Variables to Solve for Arm Positions in a Linked System?

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SUMMARY

This discussion focuses on using complex variables to determine the angular position, velocity, and acceleration of arm c in a linked system, as outlined in the question from "Fundamentals of Complex Analysis" by Saff and Snider. The user defines the complex variables Za, Zb, and Zc for arms a, b, and c, respectively, and applies the parallelogram law to establish the relationship Za + Zb = Zc + (a + b - c). The user seeks guidance on expressing Zb in terms of Za to further develop the solution.

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skilambi
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Hi All,

I am trying to learn complex analysis on my own and for this I have chosen Fundamentals of Complex Analysis by Saff and Snider. I am stuck at the last question in section 1.3 which is as follows.

For the linkage illustrated in the figure, use complex variables to outline a scheme for expressing the angular position, velocity and acceleration of arm c in terms of those of arm a.


As an attempt to the solution, this is what I have thought of so far.

Let the arm a be dictated by the complex variable Za, similarly Zb for b and Zc for c. Also since the distance between the bottom of a and c is fixed (a + b - c), we can say

Za + Zb = Zc + (a+b-c). (Parallelogram law)

However I am not sure of what comes next as I am not sure what Zb is. How can i proceed? To express Zc with respect to Za, I will somehow need to know what Zb is in terms of Za. But how do I do that?

SMK.
 

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Sorry I just realized I posted this in the wrong section. Will post this in homework section as it is a textbook style question for independent study.
 

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