Title: Reduction of structural vibration and radiated noise using acoustic resistive volume
Abstract:Undesirable noise levels and shell vibrations from pipes and cavities with internal pulsating pressures is a common problem for HVAC, automobiles and airplanes. This study is concerned with providing ...Undesirable noise levels and shell vibrations from pipes and cavities with internal pulsating pressures is a common problem for HVAC, automobiles and airplanes. This study is concerned with providing effective noise control solutions without affecting overall system performance. Acoustic impedance optimization is carried out using a Fluid-Structure-Interaction FEA solver to reduce radiated noise by adjusting the acoustic impedance in the pipes and cavities to avoid excitation of internal acoustic modes. Porous materials with high porosity (>0.9) and with hole sizes much smaller than the viscous penetration depth are introduced inside the pipe and cavities to create resistance volumes to increase acoustic dissipation. In this way, acoustic traveling waves are promoted and the formation of standing waves is minimized. This in turn reduces surface vibration levels of the pipes thereby reducing radiated noise.Read More
Publication Year: 2020
Publication Date: 2020-10-01
Language: en
Type: article
Indexed In: ['crossref']
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