TUTORIAL 7 – STABILITY ANALYSIS

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TUTORIAL 7 STABILITY ANALYSIS . This TUTORIAL is specifically written for students studying the EC module D227 Control System Engineering but is also useful for any student studying control. On completion of this TUTORIAL , you should be able to do the following. Explain the basic definition of system instability. Explain and plot Nyquist diagrams. Explain and calculate gain and phase margins. Explain and produce Bode plots. The next TUTORIAL continues the study of STABILITY . If you are not familiar with instrumentation used in control engineering, you should complete the tutorials on Instrumentation Systems.

1.INSTABILITY Consider a system in which the signals are added instead of subtracted by the summer. This is positive feed back. The electronic amplifier shown is an example of this.

  Stability