A Lagrangian Dynamics Problemby deniz120 Tags: dynamics, equation, lagrange, lagrangian, multiplier 

#1
May3110, 11:46 AM

P: 8

1. The problem statement, all variables and given/known data
Hi all, I need to derive differantial equations of system with lagrange multiplier method, a disk is rolling and a bar is fixed onto the point of a disk By deniz120 at 20100531 2. Relevant equations 3. The attempt at a solution please check my solution below, I derived T and V for Lagrange, all I need is help for constaints, lagrange multiplier equation. Thanks in advance:) By deniz120 at 20100531] 



#2
May3110, 01:38 PM

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PF Gold
P: 11,530

What specifically about the constraint is giving you problems?
You might find this page helpful: http://www.slimy.com/~steuard/teachi....html#CalcVari 



#3
May3110, 01:43 PM

P: 8

unfortunately nothing, I guess there is nonholonomic constraint
thanks 



#4
May3110, 02:44 PM

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PF Gold
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A Lagrangian Dynamics Problem
It's not a nonholonomic constraint.
You have only two coordinates, β and θ. How are they related? 



#5
May3110, 04:47 PM

P: 8

I guess you are right but that is the exact question that I m looking for the answer, how are they related:)




#6
May3110, 06:06 PM

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PF Gold
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Really? It's basic geometry. Consider the height of point B.



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