ME5659_LecNotes_FreqRespTech_2

ME5659_LecNotes_FreqRespTech_2 - Determining the Bandwidth...

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18 Determining the Bandwidth and Resonant frequency Frequency response of the closed–loop system is shown next.
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19 ( ) 1 2 2 1 2 ) ( 0.707 2 1 = = < = ζ ω r p n r G M
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20 Resonant Frequency • It is the frequency at which the magnitude reaches its maximum value. • A second order system can have only one resonant frequency. • Higher order systems can have many resonant frequencies.
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22 Natural Frequency • The frequency of the natural oscillation that would show by two complex poles if the damping value were set to zero. Bandwidth • Is the frequency, at which the frequency response has declined by 3 dB from its original value. • Bandwidth of a system is a measure of the speed of response.
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23 Stability Analysis Frequency response of an open–loop 1- Is the system stable or not ? 2- What is the “ gain margin ”? 3- What is the “ phase margin
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24 Marginal Stability • At this state, the system oscillates steadily without a steady external excitation.
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This note was uploaded on 05/26/2010 for the course ME 5659 taught by Professor Jalili during the Spring '10 term at Northeastern.

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ME5659_LecNotes_FreqRespTech_2 - Determining the Bandwidth...

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