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Homework Help: Variation of poles

  1. Sep 1, 2012 #1
    1. The problem statement, all variables and given/known data

    Hello, I would like your comments on my observations. I have a set of data from a step experiment, one input (volts D.C), one output (temperature). By doing system identification, the resultant model is second order and its poles lie at 0.99 and 0.8 (z-plane)

    Now for the set of data, the sampling rate is 5 seconds. What I did is I took the same set of data and made a new one by appending one sample per 10 samples (50 seconds sampling rate). The parameters of the new model give me the poles at 0.92 and 0.65.

    In a closed loop system I know that the closer a pole is to zero, it indicates a faster response. Does that also applies for my open loop transfer function?
    Physically, from the data, I can understand that by using 50sec sampling rate there is a bigger temperature change at every sample as compared to 5 sec rate.
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
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