time domain analysis of linear systems ch2 university of central oklahoma dr. mohamed bingabr
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Time Domain Analysis of Linear Systems
Ch2
University of Central OklahomaDr. Mohamed Bingabr
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Outline
• Zero-input Response
• Impulse Response h(t)
• Convolution
• Zero-State Response
• System Stability
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Time Domain AnalysisZero-State Response
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If M = N then h(t) = b0 (t)+ [P(D) yn(t)] u(t)
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n
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n n
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HW3_Ch2: 2.2-1, 2.2-4, 2.2-6, 2.3-1, 2.3-4, 2.4-5, 2.4-8
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Find the total response for the system D2y + 3Dy + 2y = Dx for input x(t)=10e-3tu(t) with initial condition y(0) = 0 and
Answer
5)0( y
Example
ttttt eeeeety 322 1520555)( For t 0
Zero-input Response Zero-state Response
Natural Response
ttt eeety 32 152510)(
Forced Response
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System Stability• External Stability (BIBO)
– If the input is bounded then the output is bounded
– .
• Internal Stability (Asymptotic)– If and only if all the characteristic roots are in the LHP– Unstable if, and only if, one or both of the following
conditions exist:• At least one root is in the RHP• There are repeated roots on the imaginary axis
– Marginally stable if, and only if, there are no roots in the RHP, and there are some unrepeated roots on the imaginary axis.
dh )(
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ExampleInvestigate the asymptotic & BIBO stability
of the following systems:
a) (D+1)(D2 + 4D + 8) y(t) = (D - 3) x(t)
b) (D-1)(D2 + 4D + 8) y(t) = (D + 2) x(t)
c) (D+2)(D2 + 4) y(t) = (D2 + D + 1) x(t)
HW4_Ch2: 2.4-18 (pair d), 2.4-20, 2.4-23, 2.4-33, 2.6-1