ECE :: Automatic Control Systems
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If a zero is added to a second order underdamped system
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PID controlled system has
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In case of synchro error detector the electrical zero position of control transformer is obtained when angular displacement between rotors is
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If ΔP is pressure difference, A is area of each flat surface, K is stiffness and Δx is displacement of movable surface from reference of bellows, then
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For Bode plot of (1 + jωT) has
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The open loop transfer function of a system is
. If the frequency at the intersection of - 40 dB/decade line and 0 dB line is ω, then -
Assertion (A): The closeness of G(jω) locus to (- 1 + j0) point can be used as a measured of margin of stability.
Reason (R): When the G(jω) locus comes close to encircling (- 1 + j0) point the system becomes oscillatory.
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The capacitance of a gas pressure vessel is defined as
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The slope of log magnitude curve changes by - 40 dB/decade at a certain frequency and the error between asymptote and actual curve is positive. This means that
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, the log magnitude of factor 
is 0 dB.
