# Homework Help: Print head control system

1. Feb 13, 2008

### eh87

The problem statement, all variables and given/known data
Please refer to the image attached for problem statement and diagram.

There's an inductor somewhere, but I have no idea where and I don't know how to accommodate for it. I can also see that there's another energy storage device, the spring on the right.

I have no idea where to start with the equations of motion, but I know how to put them in SS form. If someone would help me with the equations (i.e. point me in the right direction to get me started), that would be great!

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2. Feb 13, 2008

### kataya

What?

This is purely mechanical. You want to find x(t), the time history of the block (print head). The best way to do this is to write it as a differential equation and solve that. So..

$$Mx'' = \Sigma(forces) = -bx' - kx + \frac{\tau(t)}{r}$$

You can then put this in state space (just define the state variables).

Last edited: Feb 13, 2008
3. Feb 13, 2008