[December 15, 2003]

•     The Final Exam is posted. Please print it out, take it, and turn it in as per the instructions on the first sheet.
  
  [November 21, 2003]
• For the discontinuity in the dissipation function, try adding the force as T = D*tanh(100*omega) rather than T = D*sign(omega). The hyperbolic tangent function looks like a step function, only continuous. The factor 100 controls how steep the step is. A high number means steep, a low number means not steep. Using 100 worked for me. This hint should help solve the problem with the matlab model hanging.

• OOOPS! Equation 1.35 in the motor handout and the formula for A in problem 1.5 are upside down. A = 4T/pi B is the correct equation.

• See the code posted previously for the Euler, Midpoint, and ODE45 solvers. Use the ODE45 for modeling your virtual spring system. Download the file massspring.m.

• Run the code for your labs with the -l option to lockout all other processes. This may help prevent bad things from happening.

• Download the newest version of the motor control code for your lab assignment. Download the files in the software/motor directory
  Download Files

• New motor lab assignment is posted.

• Examples of student labs that received high marks are posted. You can also find Latex source and help.

• Code for the Euler and Midpoint solver is now posted.

• Next week's reading on numerical methods for differential equations is now posted.