Controls Last Quiz Flashcards

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1
Q

Ziegler-Nichols Pros

A
  • Fast
  • Simple
  • No model needed
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2
Q

Ziegler-Nichols Cons

A
  • Requires large oscillations in MV and CV
  • Hard to tell between sustained oscillation and unstable
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3
Q

Cianone - Marlin Pros

A

-Fast
- Simple
- Individual parameters

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4
Q

Cianone - Marlin Cons

A
  • Needs FOPDT model
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5
Q

Cohen - Coon needs:

A
  • FOPDT
  • minimum ISE
  • QAD
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6
Q

Direct Acting Actuator + Positive Gain = ??

A

Reverse Acting PID

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7
Q

Direct Acting Actuator + Negative Gain = ??

A

Direct Acting PID

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8
Q

Reverse Acting Actuator + Positive Gain = ??

A

Direct Acting PID

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9
Q

Reverse Acting Actuator + Negative Gain = ??

A

Reverse Acting PID

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10
Q

What tuning method is best for a fast responding loop (<10 min)?

A

Field Tuning

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11
Q

What tuning method is best for a slow responding loop (>10 min)?

A

ATV Tuning

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12
Q

What is Filtering good for?

A

Useful for D action and strong P action

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13
Q

Filtering Pros

A
  • memory efficient
  • simple
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14
Q

Filtering Cons

A
  • doesn’t reject outliers
  • doesn’t reject certain frequencies
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15
Q

Which of the following: IAE, ITAE, ISE, ITSE, penalize large error?

A

ISE and ITSE

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16
Q

What are the steps to field tuning?

A
  1. Turn off D action and I action
  2. Estimate Kc = 1/2Kp
  3. Increase Kc until criteria is met
  4. For PI, decrease Kc by 10%
  5. Estimate Tau-I = 5 Tau-P
  6. Decrease Tau-I until criteria is met
17
Q

How do Kc, Tau-I, and Tau-D change as controller aggressiveness increases?

A

Kc increase, Tau-I decreases, and Tau-D increases

18
Q

What happens to the dynamics as controller aggressiveness increases?

A

Overdamped -> critically damped -> decaying oscillations -> sustained oscillations -> unstable

19
Q

When do you want P-only control?

A

For a fast responding system that is naturally integrating
i.e. level and pressure

20
Q

When do you want PI control?

A

For a non-sluggish system that requires no offset
i.e. flow, temp, pressure, comp

21
Q

When do you want PID control?

A

For a sluggish system that requires no offset
Needs a low noise sensor
i.e. temp and comp

22
Q

What is bias?

A

Bias is the initial value sent to the actuator when the PID controller is turned on

23
Q

ATV tuning method pros

A
  • Relatively fast
  • Does not upset the system
  • Automatic