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Unformatted text preview: Improving transient response Again, we will study two techniques, placing a pure differentiator in the forward path, and placing a zero and more distant pole. Ideal derivative compensation (PD) The transient response of a system can be se lected by choosing an appropriate closed loop pole. If this closed loop pole does not lie on the root locus it must be rectified, this can be achieved by adding a single zero to the forward path. 1 Root Locus Real Axis Imag Axis87654321 1 2 34321 1 2 3 40.939+j2.151 K=23.72 Root Locus Real Axis Imag Axis87654321 1 28642 2 4 6 83+j6.874 K=51.25 Root Locus Real Axis Imag Axis654321 1642 2 4 62.437+j5.583 K=35.34 Root Locus Real Axis Imag Axis654321 1642 2 4 61.869+j4.282 K=20.76 2 Step Response Time (sec) Amplitude 1 2 3 4 5 6 7 8 9 10 0.2 0.4 0.6 0.8 1 1.2 Uncompensated Zero at2 Zero at 3 Zeros at 4 All four system have a damping ratio of 0 . 4, but placing a zero at z leads to the shortest settling time (largest negative real) and small est peak time (largest imaginary part)....
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This note was uploaded on 01/23/2012 for the course EE 4580 taught by Professor Gu during the Fall '10 term at LSU.
 Fall '10
 GU

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