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According to Hurwitz criterion, the characteristic equation


s4 + 8s3 + 18s2 + 16s + 5 = 0 is

  • a)
    Stable

  • b)
    Marginally stable 

  • c)
    Conditionally stable

  • d)
    None of these

Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
According to Hurwitz criterion, the characteristic equations4+ 8s3+ 18...
Concept:
The Routh Stability Criterion is used to test the stability of an LTI system. The conditions for stability are:
  •  All the coefficients of the characteristic Equation must be present and must have the same sign.
  • It is necessary and sufficient that each term of the first column of the Routh Array of the Characteristic Equation is positive for the system to be stable, i.e. there should not be any sign changes in the first column of each row.
  • The number of sign changes represents the number of roots on the right side of the s-plane.
  • If the first term in any row of Routh Array is zero while the rest of the row has at least one non-zero term. Because of this term, the terms in the next row will become infinite.
  • When all elements in any row of the Routh array are zero. This condition indicates that there are symmetrical/imaginary roots in the s-plane.
Application:
A(s) = s4 + 8s3 + 18s2 + 16s + 5
Forming the Routh array, we get:
Since there are no sign changes in the first column of the Routh array, we conclude that the system is stable.
Free Test
Community Answer
According to Hurwitz criterion, the characteristic equations4+ 8s3+ 18...
S^4 :  1     18      5
s^3:    8     16
s^2 : (18*8-16)/8      5
s^2 : 1       5
s^1 :   -24   -
s^0:   5

From the above routh array we can say that. The first column has negative number which implies that its Unstable.
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According to Hurwitz criterion, the characteristic equations4+ 8s3+ 18s2+ 16s + 5 = 0 isa)Stableb)Marginally stablec)Conditionally stabled)None of theseCorrect answer is option 'A'. Can you explain this answer?
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