SE 3M04 T1 2002
Assignment 4a - Final Version (Tue. Nov 12)

• Due: Thursday November 21, 20:00 through WebCT
• Goals:
  • Learn about system integration
• Build a Java program that constructs mathematical expressions for simple RCL circuits given from Spice files.
• This assignment uses the book
  Introduction to Electrical Engineering, J. David Irwin and David V. Kerns, Jr.
  for all its circuit examples; this book was the textbook used in EE 2CI4 / EE 2CJ4 last year, so most of you should have a copy.
• The program should be designed so that it write out the equations for all of the following circuits:
  1. p.59 Figure 2.24(a)
  2. p.61 Figure D2.12
  3. p.85 Exercise 2.12 and 2.16
  4. p.122 Exercise 3.12
  5. p.123 Exercise 3.22
  Note that solving the equations is not required. You will need to extend (slightly) the previous code(s) to handle some of these questions.
• More specifically, using at least Kirchoff's current law and Ohm's law, write down the node equations for the current and the equivalent equations for the voltages. All exercises for this assignment will have known currents (and only current sources) and unknown voltages. Supernodes will not be needed.
• More specifically, you are to
  1. Write Spice files corresponding to the above exercises.
  2. Have your program read them in to a Circuit, using the code from assignment 2.
  3. From the circuit, use a nodal analysis to create the equations, and use the Equation class (and all its sub-classes) from assignment 3 to store the results
  4. Print out the resulting equation Strings to standard output. The equations are to be printed twice:
     1. Once with all components fully symbolic
     2. Once with known values substituted in
• Deliverables:
  1. Complete Java program (ie all necessary .java and .class files for a working program)
  2. Spice files corresponding to each of the 6 exercise
  3. The output of running your program on all 6 (both sets of equations)
  4. electronic copy of log
• Notes:
  • You may share Spice files around. Just be sure to indicate this in your log.
  • See section 2.7 of the book, specifically Figure 2.23(a) and the accompanying text for a worked out fully symbolic example, and Figure 2.24(a) and the accompanying text for a worked out values substituted example with the same circuit
  • The equations output by your program are expected to look awful and be un-simplified.
  • The PCs in the ITB building now have Java installed on the Windows partition as well as the Linux partition.
• Hints:
  • Use Maple and the Syrup package to verify your answers. This is not required by any means, but you may find this very helpful for completing the assignment correctly.
  • Use the node names, as defined in the Spice file, to name your voltage nodes. Use the component names for the currents (both for the known current sources and the current accross other components). This will make your output a lot more predictable.
• Bonus points:
  • There are many different possibilities for 'bonus' assignments leveraging off of this assignment. If you are interested, contact me, and I will give you choices, with different effort/point levels, as you wish to pursue. There will all be due Dec. 2nd

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