# Laplace Transform help

I have two subsystems that I'm trying to transform into the frequency domain, and trying to obtain the transfer function for each.

I have an equation (for system 1)

m$$\ddot{x}$$ -k(x2-x1) - b*$$\dot{x}$$1 = f

Since this is for system 1, when I take the laplace transform of it, do i have x2 as a function of s (x2(s)) or do i treat x2 as a constant?

Thanks

## Answers and Replies

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LCKurtz
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I have two subsystems that I'm trying to transform into the frequency domain, and trying to obtain the transfer function for each.

I have an equation (for system 1)

m$$\ddot{x}$$ -k(x2-x1) - b*$$\dot{x}$$1 = f

Since this is for system 1, when I take the laplace transform of it, do i have x2 as a function of s (x2(s)) or do i treat x2 as a constant?

Thanks
I suppose that first term should have a 1 subscript on the second derivative. You have to use x2(s) and you won't be able to solve for x1(s) or x2(s) without transforming both equations.