Figure 19: Frequency-averaged pressure PSD in c2, for a TBL excitation, plotted versus ξ and η, for β > 1, with ηopt(ξ = 0) (white ◦) and (ξopt , ηopt) (white ∗) (a). Pressure PSD for β > 1: no control (−−); passive control with ηopt(ξ = 0) (· · ·); optimal tuned active control with (ξopt , ηopt) (−) (b) at (xp, yp, zp) = (Lcx/3, Lcy/3,−2Lc2z /3).
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