lec17_18

lec17_18 - Slide 5 ME 475 Session 17: Stability Margins...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Relative Stability Proximity to encirclement of - 1 is a measure of closeness to instability, i.e., relative stability. Slide 1 ME 475 Session 17: Stability Margins Galen King Purdue University Relative stability is quantified via: Gain Margin Phase Margin
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Example ) 6 s )( 2 s ( s K 10 ) s ( L + + = Im s Im L Slide 2 ME 475 Session 17: Stability Margins Galen King Purdue University Re s Re L
Background image of page 2
Example s = ε e j φ ( 29 ( 29 6 e 2 e e 10 lim ) s ( L j j j 0 + ε + ε ε = φ φ φ ε Slide 3 ME 475 Session 17: Stability Margins Galen King Purdue University
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Example s = j ϖ : ( 29( 29 ϖ + ϖ + ϖ = ϖ j 6 j 2 j 10 ) j ( L Slide 4 ME 475 Session 17: Stability Margins Galen King Purdue University
Background image of page 4
Apply Nyquist Stability Criterion
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Slide 5 ME 475 Session 17: Stability Margins Galen King Purdue University Stability Margins • Minimum-Phase Systems: Systems for which L(s) has no zeros or poles in the right-half-plane. Slide 6 ME 475 Session 17: Stability Margins Galen King Purdue University (A system having the same transfer function with one (or more) pole or zero reflected into the RHP will always undergo larger phase shifts.) For minimum-phase systems, stability can be determined directly from open-loop freq. response....
View Full Document

This document was uploaded on 03/31/2011.

Page1 / 6

lec17_18 - Slide 5 ME 475 Session 17: Stability Margins...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online