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Root-locus plots as explained in the text, for the cases (a) C′ is varied from zero to 3 × 10−4 m/N; (b) m b is varied from zero to 6.6 g; (c) k s is varied from zero to 60 kN/m. Circles indicate the zero value of each parameter. Black stars: nominal case; large green symbols: first two fitted poles of the bare-membrane admittance; green stars along the horizontal axis: values of Ω corresponding to the range investigated.
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