Active control of turbulent boundary layer-induced sound transmission through the cavity-backed double panels

TLDR: In this article, the authors present a theoretical study of active control of turbulent boundary layer TBL induced sound transmission through the cavity-backed double panels, where a feedback control unit is located inside the acoustic cavity between the two panels.

About: This article is published in Journal of Sound and Vibration.The article was published on 2018-05-26 and is currently open access. It has received 22 citations till now. The article focuses on the topics: Sound transmission class & Sound pressure.

Figures

Figure 1: The model problem. 5

Figure 2: Reduced order model.

Figure 13: Case for β < 1. Amplitude (a) and phase (b) of the collocated (solid line) and non-collocated (dashed line) transfer mobility.

Figure 14: Mean squared velocity of the radiating panel plotted versus ξ and η in case of a point force excitation for β < 1, with ηopt(ξ = 0) (white ◦) and (ξ = 6.3, ηopt(ξ = 6.3)) (white ×) (a). Amplitude of the velocity at the centre of pr: no control (−−); passive control with ηopt(ξ = 0) (· · ·), optimal tuned active control with (ξ = 6.3, ηopt(ξ = 6.3)) (−) for β < 1 (b).

Figure 3: Principal diagonal minors plotted versus the active damping ratio ξ, (−) ∆1, (−−) ∆2, (· · ·) ∆3, (− ·−) ∆4: β > 1 (a); β < 1 (b).

Figure 8: Frequency- and space-averaged pressure PSD in the cavity c2 plotted versus ξ and η with a TBL excitation, with ηopt(ξ = 0) (white ◦): β > 1 with (ξopt , ηopt) (white ∗) (a); β < 1 with (ξ = 10, ηopt(ξ = 10)) (white ∗) (b).