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Topic: transfer function
Replies: 2   Last Post: Dec 5, 2012 9:04 AM

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Shri

Posts: 4
Registered: 12/4/12
Re: transfer function
Posted: Dec 5, 2012 9:04 AM
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On Wednesday, December 5, 2012 1:41:19 PM UTC, Nasser M. Abbasi wrote:
> On 12/5/2012 7:17 AM, shri preethi wrote:
>
>
>

> > can some one help me out to find the transfer function fore a pneumatic pump
>
> >and the matlab progr

>
>
> You find the TF for any system the same way. You start with
>
> the mathematica model. i.e. you derive the equation of motion.
>
> (or the relation between the input/output in time domain)
>
> This is step (1)
>
>
>
> You'll end up with a differential equation. For SISO, you'll
>
> have something like ay''+by'+cy=f(y,t). For MIMO you'll need
>
> to use state space (ss functions, i.e. A,B,C,D), much easier.
>
>
>
> Then you translate this to Laplace domain, then you find
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> the ratio of the Laplace Y(s) of the output (y(t) in the above) to
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> the Laplace F(s) of the input (f(y,t) in this case).
>
>
>
> This ratio is the transfer function, will be a function of 's',
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> the Laplace domain variable. It should have a numerator polynomial
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> in 's' of order <= that in the denominator polynomial, else you
>
> did something wrong in the model.
>
>
>
> So, did you step (1) above? if so, what is the equation?
>
>
>
> or you want one to also derive the equation for the pump as well?
>
>
>
> If so, what is the specifications? (sizes, pressure, input, etc...?)
>
>
>
> I do not do mechanical pumps myself, at school mostly we do basic
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> mechanical systems (mass/damper/spring things) so I can't help you with
>
> the model itself but may be someone else would, but you have to give
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> specifications. Engineers like to see specifications before doing
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> design.
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>
>
>
>
> www.engineersedge.com/hydraulic/hydraulic_pneumatic_cylinder_force_10105.htm

the specificetion r thr in this link...using tis i need to find the transfer function....can u plz help it out...



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