Control Systems — question 6 of 10
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You're staring at a Bode plot for a closed-loop system and someone tells you the gain margin is 3 dB and the phase margin is 8 degrees. Both numbers are technically 'positive,' meaning the loop is nominally stable, but a colleague says this system is basically unsafe to ship. Explain why small, positive margins are still a serious problem, using a concrete physical example of what could push this system into instability.