Why Estimate Step- and Frequency-Response Models?
Frequency-response and step-response are nonparametric models that can help you understand the dynamic characteristics of your system. These models are not represented by a compact mathematical formula with adjustable parameters. Instead, they consist of data tables. In this portion of the tutorial, you estimate these models using the data set ze. You must have already created ze, as described in Creating iddata Objects. The response plots from these models show the following characteristics of the system: • The response from the first input to the output might be a second-order function. • The response from the second input to the output might be a first-order or an overdamped function.
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