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Unformatted text preview: Lecture S11 Muddiest Points General Comments In this lecture, we looked at the definition of state , and applied statespace ideas to the derivation of the dynamics of a circuit. This approach leads to a set of first order, linear differential equations in a specific form. Hopefully, it will become a little more clear in the next lecture why this form is so nice. Responses to MuddiestPartoftheLecture Cards (36 cards) 1. What are state vectors used for? How does the equation x = Ax (15) predict the behavior of the circuit? (1 student) I dont really understand the point behind state functions and how to derive them. (1) The state equation (in matrix / vector form) is a set of first order, coupled differential equations that describe the dynamics of the circuit, just as were the equations we found in previous lectures. The difference is that the statespace form is a special case, that expresses the dynamics in a very specific form that is easier to work with. It also has theoretical advantages that are dicult to explain in only one or two lectures, but is truly the modern way to think about the dynamics of systems. For example, the statespace approach made possible advances in navigation technology that enabled travel to the moon. 2. In the example, why does e 1 = v 4 ? (1) The inductor L 4 is connected to the upper node with potential e 1 , and the ground node. The difference in potential across the inductor is then e 1 0 = e 1 . 3. Confused about the derivation of the state equations. (1) General confusion about the states of the circuit. Please reread the notes, and see me at oce hours Monday, or in recitation. 4. Your example was clear up to the application of KCL at v 1 . (2) After solving for all the unknown nodes, we solve for the current in the voltage sources (or capacitor in this case). The current out of the v 1 node is i 1 + G 2 v 1 + G 3 ( v 1...
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 Fall '05
 MarkDrela
 Dynamics

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