07. MG3217 Kendali Proses S02: PID Tuning, Ziegler-Nichols, Cohen-Coon (Latihan Soal))

Summary

This lecture covers the use of two controller tuning methods—Ziegler-Nichols (ZN) and Kunkun—through practical examples in process control systems, particularly in factory settings. The ZN method requires experiments to determine system stability, while the Kunkun method offers a faster, more direct approach but may be less stable. The video walks through simulations and real-time adjustments in control parameters, comparing the strengths and weaknesses of both methods. It provides an in-depth understanding of how to optimize control system performance by selecting the right tuning method and ensuring system stability.

Takeaways

• 😀 Ziegler-Nichols (ZN) and Kun Kun methods are two techniques for setting parameters in a process control system.
• 😀 The Ziegler-Nichols method involves experimenting with the system's parameters and observing the system's response.
• 😀 Ziegler-Nichols method requires a step-by-step process, adjusting parameters to stabilize the system.
• 😀 Kun Kun method is more straightforward, as it only requires drawing a curve and using a slope to determine the necessary parameters.
• 😀 Ziegler-Nichols may require several trials to find the appropriate parameters, which can be time-consuming.
• 😀 The Kun Kun method can be faster but may not always result in a stable system, requiring additional testing.
• 😀 OpenModelica can be used to simulate and modify system models for both Ziegler-Nichols and Kun Kun methods.
• 😀 In the Ziegler-Nichols method, stability is assessed by observing the system’s response and adjusting until it returns to the setpoint.
• 😀 Kun Kun method requires finding a balance between accuracy and simplicity, with the potential for quicker results but less flexibility.
• 😀 Both methods have their strengths and weaknesses, and the choice of method depends on the specific needs and constraints of the process.

Q & A

What are the two methods discussed in the lecture for setting parameters in a control system?

The two methods discussed are the Ziegler-Nichols (ZN) method and the Kunkun method (referred to as Sisi).

How is the Ziegler-Nichols method applied in the context of the script?

The Ziegler-Nichols method is applied by performing experiments to adjust the proportional gain until the system oscillates and stabilizes around a setpoint, using simulations in a factory or controlled environment.

What is the advantage of the Ziegler-Nichols method?

The Ziegler-Nichols method is advantageous because it is a well-established method that leads to stability over time, although it requires multiple iterations of trial and error.

What is the Kunkun method and how does it differ from Ziegler-Nichols?

The Kunkun method is a quicker approach to setting parameters in a control system. It typically involves drawing a curve with fewer adjustments but can lead to initial instability, unlike Ziegler-Nichols, which is more stable after adjustments.

What is a potential drawback of using the Kunkun method?

A drawback of the Kunkun method is that it may lead to instability in the early stages of the system's response, requiring further tuning and adjustments.

What did the lecturer mention about the speed of the Kunkun method?

The lecturer pointed out that the Kunkun method is faster than Ziegler-Nichols, as it requires fewer adjustments to achieve a rough parameter setting.

How can stability be ensured when using the Kunkun method?

Stability can be ensured by performing simulations before applying the Kunkun method in real-world industrial settings, allowing for adjustments if needed.

Why are simulations emphasized in the lecture before applying these methods to industry?

Simulations are emphasized because they allow for testing and verification of the control parameters, ensuring that the system is stable and functioning correctly before real-world application.

What was the result when the Ziegler-Nichols method was used in the example from the script?

When the Ziegler-Nichols method was used, the system oscillated and stabilized at the setpoint after several trials, but it took a longer time to achieve stability compared to the Kunkun method.

What is a key difference in how the Ziegler-Nichols and Kunkun methods handle the initial response curve?

Ziegler-Nichols involves gradually increasing the proportional gain until the curve stabilizes, while Kunkun involves drawing a curve quickly and adjusting the parameters with fewer steps, which may lead to an unstable initial response.