CDS 101/110a, Fall 2006 - FAQ
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| CDS 101/110a | Schedule | Recitations | FAQ | AM06 (errata) |
This page contains frequently asked questions for CDS 101/110. You can find FAQs for individual lectures and homework sets on the topics page for each week, available via the course schedule.
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Week 1
- Can you make the graphics bigger so that we can see them?
- Can you speak more slowly?
- How are stability, performance, and robustness different? They seem very similar
- How do I create a FAQ for CDS 101/110?
- I did not understand robustness
- I didn't catch the fly video. Is it available online?
- Is control a type of negative feedback?
- Is it possible to take CDS 110b without taking CDS 110a?
- Is there room for learning in control systems theory?
- Latency wasn't mentioned in the example; does it affect robustness?
- Should we bring our computers with Matlab installed to the review Friday?
- What is the schedule for 101 in the 4th, 6th, & 8th weeks?
- Where can I get a more detailed description of how the flyball governor works?
- Why does instability imply poor performance?
- Are there any advances in applying feedback modeling to social systems other than in an economic sense?
- Can the environment be considered a system state?
- How do I save the mp3 files?
- It's a bit unclear to me when you talk about "error" in PID control
- What are methods for determining errors in a real system?
- What is fuzzy logic?
- For problem 1, how detailed should my description of a control system be?
- What does y(:,1) mean? (Matlab)
- Will the Matlab tutorial give me the sufficient knowledge in order to solve Problems 2 and 4?
- Problem 1 -- Do I need to know exactly how a device works to use it as an example?
- Problem 2b -- Does this mean exactly or at least fifty percent?
- Problem 4 -- Do I have to sum n i(t)?
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Week 2
- How do we read the simulated predator-prey graph?
- How is the Internet a feedback system?
- Is q1 a function of time
- Is there any open source software we can use instead of MATLAB?
- What are the Di parameters in the power grid model?
- What does the 45 mean in ode45?
- What does the at symbol mean in front of a function in matlab?
- What is a finite state machine and how does it relate to the traffic example?
- What's the difference between control "over" network and control "of" network?
- Where can I find a theoretical definition of dynamical system?
- Why is dB defined as 20log 10?
- Why was there only one damper in the mass/spring model?
- Could you give a precise definition for "Control Law"?
- In Wed's lecture slide no.13, why does the block "Drag Aerodynamics" connected to the summation and to the vision system?
- What is h in slide no. 6 of Wed's lecture?
- Problem 1 -- Can I use Maple or Mathematica to solve this?
- Problem 1 -- Why don't the units work?
- Problem 2 - Actuator block
- Problem 2 -- Saturation of signal u
- Problem 2b -- Do I need to include the controller and feedback?
- Problem 3 -- Does "output get smaller as k gets larger" mean it gets more negative or more closer to zero?
- There are some problems with Ex 6
- Why are the initial conditions of the integrator and engine in hw1cruise.mdl set to 55*50?
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Week 3
- Are the dynamics on slide 10 correct?
- Has a stable system a stable eq. point? a limit cycle?
- How are the z variables defined on slide 10, Lecture 3-1?
- How do equations given for dynamics on slide 10 relate to the state-space setup we used before?
- How do we choose epsilon in the definition of stability?
- How was V(x) derived on slide 13 of Lecture 3-1?
- Is the overshoot definition on slide 12 correct?
- Is the system on slide 5 stable?
- What is "closed form"?
- What is a stable system?
- Who/What is Lyapunov?
- Was the equation for V(q) for the spring mass example missing a transpose?
- Where can I find the proof to the Lyapunov Theorem?
- How do I plot a 3D phase portrait?
- Problem 2 -- What's the second element in the state of the system?
- Problem 3: How to deal with the saturation?
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Week 4
- Is it standard practice to use degrees to represent the phase in frequency response analysis?
- The homework set took 15 hours and this class is not my only priority!
- HW4 Prob 2a Correction
- HW4 Prob 3 Hint
- HW4 Prob 4a Formula Correction
- HW4 Prob 4c Correction
- How do we investigate stability of a system that has inputs?
- Problem 2 -- Missing parameter
- Problem 2 -- Use equations in book errata.
- Problem 3 (c) -- Errata
- Problem 3a -- Formula correction
- Problem 6 -- Missing length in 2nd set of equations
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Week 5
- Can you recommend a good linear algebra resource?
- Could we move office hours?
- Is T completely arbitrary in the definition of reachability?
- What is matrix rank and how do i calculate it?
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Week 6
- Can you explain the axes of the Bode plot better?
- Intermediate steps in block diagram algebra for the Engine Control of a GM Astro example?
- Can I cascade (multiply) transfer functions in MATLAB?
- Problem 2 -- How to deal with "d" term.
- Problem 2b -- Value of kp
- Question 3
- Question 4
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Week 7
- Controller postion on page 3 of lecture notes.
- How can we conclude that the open loop system on page 6 is stable from the bode plot?
- Is it possible for N to be negative?
- Lecture 7.1 bugs
- Why counterclockwise encirclements of -1?
- Why does Z≠0 correspond to instability?
- "HW6 Question 3"
- HW 6 Question 4
- Hw 6 Problem 2
- Matlab tips for using less paper.
- Problem 4a -- Change gain crossover to bandwith
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Week 8
- HW 7 Prob 1 Comments
- HW 7 Problem 2
- Problem 1 b and c -- Plot step and freq response
- Problem 1c - Ziegler-Nichols
- Problem 3d - Pay special attention to low Ti values
- Problem 4c -- Settling time
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