Learning Notes: Control Systems Engineering (Nise 7th, 2015)
Published:
Shared notes while working through Norman S. Nise, Control Systems Engineering, 7th Edition (2015) — review questions, skill problems, and MATLAB experiments.
Human answers and LLM drafts live side by side under each question so either can be added or revised without rewriting the structure.
- Conventions
- Chapter 1 — Introduction
- Review Questions
- Q1. Name three applications for feedback control systems.
- Q2. Name three reasons for using feedback control systems and at least one reason for not using them.
- Q3. Give three examples of open-loop systems.
- Q4. Functionally, how do closed-loop systems differ from open-loop systems?
- Q5. State one condition under which the error signal of a feedback control system would not be the difference between the input and the output.
- Q6. If the error signal is not the difference between input and output, by what general name can we describe the error signal?
- Q7. Name two advantages of having a computer in the loop.
- Q8. Name the three major design criteria for control systems.
- Q9. Name the two parts of a system’s response.
- Q10. Physically, what happens to a system that is unstable?
- Q11. Instability is attributable to what part of the total response?
- Q12. Describe a typical control system analysis task.
- Q13. Describe a typical control system design task.
- Q14. Adjustments of the forward path gain can cause changes in the transient response. True or false?
- Q15. Name three approaches to the mathematical modeling of control systems.
- Q16. Briefly describe each of your answers to Question 15.
- Chapter 2 — Modeling in the Frequency Domain
Conventions
Use one heading per question. Under it, keep at most two answer blocks:
| Label | Who writes it |
|---|---|
| Me | My own answer / intuition |
LLM (model) | Draft from an LLM; name the model in backticks |
Copy this template when adding a new question:
### Qn. Question text here
**Me**
- point 1
- point 2
**LLM** (`gemini`)
- point 1
- point 2
Rules of thumb:
- Prefer short bullets over long prose.
- If not answered yet, leave
_todo_. - Do not overwrite the other author’s block; append a note or a second revision instead.
- Chapter sections use
##; questions use###so the TOC stays useful.
Chapter 1 — Introduction
Review Questions
Q1. Name three applications for feedback control systems.
Me
- Blood sugar control
- Room temperature control by air conditioner
- Water level control by a valve and floating ball in a toilet
LLM (gemini)
- Automotive cruise control — measures vehicle speed, compares it to the set speed, adjusts throttle for hills and wind.
- Building climate control (thermostat) — senses room temperature, compares to the setpoint, switches heating/cooling to reduce error.
- Hard-disk head positioning — senses head location relative to the track, drives the voice-coil motor to stay aligned.
Q2. Name three reasons for using feedback control systems and at least one reason for not using them.
Me
Reasons for using:
- Improve stability — without feedback, disturbances go unnoticed
- Control precision — without feedback, malfunctions go unnoticed
_todo_(third reason)
Reasons for not using:
- When the job is pure amplification, and simplicity matters more than correction
LLM (gemini)
Reasons for using:
- Transient response improvement — shape rise time, overshoot, and settling
- Disturbance rejection — correct external inputs (wind, load changes)
- Sensitivity reduction — reduce the effect of parameter drift and modeling error
- Noise / distortion reduction — attenuate internal nonlinearities and noise
Reasons for not using:
- Cost and complexity — sensors, wiring, and processing
- Risk of instability — high gain or delay can make a stable open-loop plant oscillate
- Reduced open-loop gain — feedback lowers overall gain; extra amplification may be needed
Q3. Give three examples of open-loop systems.
Me
- Speed control by throttle on a traditional non-smart car (fixed pedal → speed drifts with hills/wind)
_todo__todo_
Note — the same car can be closed-loop if the driver is inside the system boundary (eyes + brain + foot as feedback).
LLM (gemini)
- Toaster — fixed timer; no sensing of toast color
- Microwave oven — fixed time/power; no food-temperature feedback
- Timer-based washing machine — fixed wash/rinse/spin sequence; no cleanliness sensor
Q4. Functionally, how do closed-loop systems differ from open-loop systems?
Me
Closed-loop systems use feedback: they measure output, form an error, and adjust the control action from that error.
LLM (gemini)
A closed-loop system measures its output, compares it with the desired input to form an error, and continuously adjusts control to reduce that error and reject disturbances.
An open-loop system acts from the input alone, with no output measurement, so it cannot self-correct for disturbances or parameter changes.
Q5. State one condition under which the error signal of a feedback control system would not be the difference between the input and the output.
Me
todo
LLM
todo
Q6. If the error signal is not the difference between input and output, by what general name can we describe the error signal?
Me
todo
LLM
todo
Q7. Name two advantages of having a computer in the loop.
Me
todo
LLM
todo
Q8. Name the three major design criteria for control systems.
Me
todo
LLM
todo
Q9. Name the two parts of a system’s response.
Me
todo
LLM
todo
Q10. Physically, what happens to a system that is unstable?
Me
todo
LLM
todo
Q11. Instability is attributable to what part of the total response?
Me
todo
LLM
todo
Q12. Describe a typical control system analysis task.
Me
todo
LLM
todo
Q13. Describe a typical control system design task.
Me
todo
LLM
todo
Q14. Adjustments of the forward path gain can cause changes in the transient response. True or false?
Me
todo
LLM
todo
Q15. Name three approaches to the mathematical modeling of control systems.
Me
todo
LLM
todo
Q16. Briefly describe each of your answers to Question 15.
Me
todo
LLM
todo
Chapter 2 — Modeling in the Frequency Domain
Coming next. Add review questions with the same ### Qn / Me / LLM pattern.