Re: Time delayed transfer function

[Yuri Belenky]

Hi Doug,

Forward path transfer function (open loop) looks as follow: G(s)=210/(s+0.003899*s^2+0.0000023*s^3). In hardware realization it samples at 20kHz. The feed-back sensor is CCD with variable sample rate - from 300Hz to 2kHz. I assume that feedback path gain is 1 so transfer function of close loop will be: G(cl)=G(s)/(1+G(s)*exp^-Ts). Actually what I need is apply sinusoid signal by G(cl) and compare input and output at different values of "T" - the result will be tracking error of my system. The problem is if I trying different discretization for feed-forward and feed-back paths the "feedback" function return error.

Thanks,
Yuri.

On Sat, Oct 10, 2009 at 11:08 PM, <address@hidden> wrote:

Do you gave all the transfer functions of the  loop?

Z^-1 is a delay of one sample time, so ad this to the feed back part of your system.

If you are a beginner and want some help off-line then send me more info.

If what I just said is not the answer then send more info of what you are doing.

Doug

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Date: Sat, 10 Oct 2009 22:43:04 +0200
Subject: Time delayed transfer function
From: address@hidden
To: address@hidden

How to add delay to transfer function in Octave? I need simulate system with different delays (or different sampling rates) in feedback path with constant sampling rate in forward path.