2.004  Dynamics and Control II

Office hour next week and grades online

Hello everyone,

1. The following are the office hour sessions next week before final exam:
Next Tuesday: Youzhi 8pm-10pm 5-314;
Next Wednesday: Professor Turitsyn 6pm-7pm 3-336;

2. Homework grades of all pests, quiz 1 and quiz 2 should be able to view online. You may access them under Homework_Assignment or under Membership_Gradebook on steller. Please view your grades online carefully to see if there is any discrepancy. If any questions, please feel free to let me know.

3. Return graded psets: I will also bring all of the graded psets and quizzes on the Tuesday office hour.

Best,
Youzhi

Announced on 11 December 2015  11:25  p.m. by Youzhi Liang

Final Exam Topics and Rules

The exam is cumulative, so it will touch on most of the topics you have seen in the course. That is, it is going to have the topics of Quiz 1 plus those of Quiz 2, plus frequency domain topics: frequency response, Bode plots, gain margin and phase margin, stability, but we will not have design of compensators in the frequency domain.

You can bring the calculator

You can bring a 3-sided note sheet

closed books/closed notes

Announced on 09 December 2015  9:26  a.m. by Domitilla Del Vecchio

No Del Vecchio office hour tomorrow

If you'd like to ask me questions about any topic of the material, please send me an email.

Announced on 09 December 2015  9:20  a.m. by Domitilla Del Vecchio

Gain Margin and Phase Margin

Since a few people asked after class:

The criterion for stability of the closed loop system based on phase margin (PM) and gain margin (GM) of the open loop transfer function H(s) can be applied ONLY if the open loop transfer function DOES NOT have poles or zeros with zero or positive real part [i.e. only when H(s) is minimum phase].

So, if H(s)=s/(s+1) or (s+1)/s or (s-1)/(s+1) or (s+1)/(s-1) etc. you CANNOT infer stability of the closed loop system using GM and PM. You need to use root locus or Routh-Hurwitz applied to the closed loop transfer function. The reason for this is deriving from Nyquist stability theory, which unfortunately we do not have time to cover, but you can learn in 2.14.

Announced on 03 December 2015  11:45  a.m. by Domitilla Del Vecchio

Issue of Grade Access on Stellar

Hello, everyone

I am sorry that there seems to be an issue for everyone the see the grades on stellar. Ist helped fix this problem once before. This time I am not sure if it is because of our mistake on the settings or the webpage problem. It should have shown grades of quiz 1, quiz 2, and homework from pset 1 to pset 8. But do not worry, we have all of your grades kept in record. We will try our best to fix this as soon as possible. I will keep you posted.

Best,
Youzhi

Announced on 02 December 2015  2:49  p.m. by Youzhi Liang