Flow Diagrams for 2nd order systems - help please. (details inside)?

I have a problem involving a control system of rotation with a flexible axel and friction.

The ODE's characterising the system are as follows:

T=J(thetaone)(second derivative) + k[thetaone - thetatwo]
0=B(thetatwo)(firstderivative) + k[thetatwo-thetaone]

I want to draw a flow diagram.

Any suggestion, thanks in advance and sorry for the way the equations are written.

Search similar questions on YaHOo or Google. Just a thought.
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