Question: P 6 . 1 1 A feedback control system has a characteristic equation s 3 + ( 2 + K ) s 2 + s

6.11

A feedback control system has a characteristic equation

3 + (2 +

)

2 +

+ (1 + 2

) = 0 .

The parameter K must be positive. What is the maximum value K can assume before the system becomes unstable? When K is equal to the maximum value, the system oscillates. Determine the frequency of oscillation.

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