Aerospace Engineering > GATE 2009 > Dynamic Stability
The roots of the characteristic equation for the longitudinal dynamics of a certain aircraft are:
λ1 = -0.02 + 0.2i
λ2 = -0.02 - 0.2i
λ3 = -2.5 + 2.6i
λ4 = -2.5 - 2.6i
where i = √-1. .The pair of eigenvalues that represent the phugoid mode is
λ1 = -0.02 + 0.2i
λ2 = -0.02 - 0.2i
λ3 = -2.5 + 2.6i
λ4 = -2.5 - 2.6i
where i = √-1. .The pair of eigenvalues that represent the phugoid mode is
Correct : d
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