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Finding Gain and Time Constant from a Transfer Function Model



LearnChemE

Determines the gain and the time constant for a stirred tank bioreactor that is represented by a first-order transfer function.

Made by faculty at Lafayette College and produced by the University of Colorado Boulder, Department of Chemical & Biological Engineering.

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8 thoughts on “Finding Gain and Time Constant from a Transfer Function Model
  1. I am wondering if you can do this for a second order transfer function. For example, if you had simplified the denominator of the transfer function to s(s+2), can you say that the time constant for the system is 1?

  2. t=5tau seems arbitrary. Why not 4tau, when e^-4 would be 0.018 and could be rounded to zero, or 6tau when e^-6 would be 0.0025 and could be rounded to zero? Is there some significant figures or orders of magnitude argument that is being made that allows you to decide that 5tau is okay to choose, or has it just been agreed upon that for this equation, yprime = KM(1-exp(-t/tau)), 5tau is sufficient to approximate steady state?

    I guess its easy enough to just remember 5tau, just curious why that value was chosen. And thanks for the video.

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