Analyzing the acoustic wave propagation characteristics in discontinuous bifurcated waveguide

Afsar, Haleem; Peiwei, Gao; Aldandani, Mohammed; Akbar, Yasir; Alam, Mohammad Mahtab

doi:10.1016/j.chaos.2023.113499

Cited by 9 publications

(1 citation statement)

References 28 publications

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“…Specially, conduits or ducts used in heating, ventilation, and air conditioning 'HVAC' to supply and eliminate air. A conduit system is also called duct framework [6,7]. Depending upon configuration like, laying out, sizing, optimizing, detailing, and locating the stress losses through a conduit system is referred to as conduit design [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Optimizing the noise control in a two-layer conduit

Shafique,

Arsalan Ahmad,

Afzal

2024

Phys. Scr.

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In the modern world, noise pollution is a major concern due to its prevalence. This work focuses on optimizing noise control in a two-layer conduit. A conduit comprises an inlet and double-outlet zone (DOZ). The upper walls of the DOZ are lined with perforated absorbent material while the lower walls are layered with ﬁbrous. Mathematically, the physical problem is formulated with a ﬁeld wave equation together with rigid and impedance boundary conditions in the respective zones. Such governing boundary value problem (BVP) leads to the Sturm-Liouville (SL) category in which standard orthogonality relations (OR) are indispensable. The system of the linear equations of the BVP is acquired with a semi-analytical Mode-Matching (MM) approach by implementing the continuity conditions of sound pressures and velocities at the matching junction with the aid of OR. These systems are truncated and solved numerically with computation learning to obtain the reﬂected and transmitted modal amplitudes in respective zones. Due to the lining’s perforated upper walls, ﬁbrous lower walls, and reversal in the DOZ, the analysis of the reﬂected and transmitted powers versus frequencies is signiﬁcantly observed and is shown in graphical ﬁndings. The algebraic derivation is validated by satisfying the conservation law of power ﬂux and matching continuity conditions for impedance, perforated, and ﬁbrous lined boundaries.

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