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In the industrial control system, which one of the following methods is most commonly used in designing a system for meeting performance specifications?

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  1. The transfer function is first determined and then either a lead compensation or lag compensation is implemented
  2. The transfer function is first determined and PID controllers are implemented by mathematically determining PID constants
  3. PID controllers are implemented without the knowledge of the system parameters using Ziegler— Nichols method
  4. PID controllers are implemented using Ziegler -- Nichols method after determining the system transfer function

Answer (Detailed Solution Below)

Option 3 : PID controllers are implemented without the knowledge of the system parameters using Ziegler— Nichols method
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Explanation:

In Ziegler Nicholas's method, by giving a step input, first, we obtain the response from the response curve.

∴ We need the output response curve and we don’t need any information about the system parameter.

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