A new type of muffler based on microperforated tubes
Microperforated plate (MPP) absorbers are perforated plates with holes typically in the
submillimeter range and perforation ratios around 1%. The values are typical for …
submillimeter range and perforation ratios around 1%. The values are typical for …
Acoustic absorption modeling of single and multiple coiled-up resonators
A Magnani, C Marescotti, F Pompoli - Applied Acoustics, 2022 - Elsevier
This work proposes an improved design procedure of sound absorption metamaterials
consisting of acoustic coiled-up quarter-wave resonators that fit into a limited space, in order …
consisting of acoustic coiled-up quarter-wave resonators that fit into a limited space, in order …
Prediction of ingestion through turbine rim seals—Part I: Rotationally induced ingress
JM Owen - 2011 - asmedigitalcollection.asme.org
The mainstream flow past the stationary nozzle guide vanes and rotating turbine blades in a
gas turbine creates an unsteady nonaxisymmetric variation in pressure in the annulus …
gas turbine creates an unsteady nonaxisymmetric variation in pressure in the annulus …
LattSAC: a software for the acoustic modelling of lattice sound absorbers
The increasingly distressing problem of noise pollution prompts the rapid research and
development of lattice-based acoustic materials for practical applications. These lattices …
development of lattice-based acoustic materials for practical applications. These lattices …
Broadband and low-frequency sound absorption of modified Helmholtz resonator combined with porous layer addition
EF Vergara, GN Almeida, LR Barbosa… - Journal of Applied …, 2022 - pubs.aip.org
In this work, a hybrid acoustic material (HAM) is designed for broadband and low-frequency
sound absorption based on the combination of two different materials: a porous layer …
sound absorption based on the combination of two different materials: a porous layer …
Optimisation of micro-perforated cylindrical silencers in linear and nonlinear regimes
This paper describes analytical and experimental studies conducted to understand the
potential of lightweight non-fibrous alternatives to dissipative mufflers for in-duct noise …
potential of lightweight non-fibrous alternatives to dissipative mufflers for in-duct noise …
Transfer impedance of microperforated materials with tapered holes
It has been previously shown that relatively simple computational fluid dynamics (CFD)
models can be used to calculate the transfer impedances, including the associated end …
models can be used to calculate the transfer impedances, including the associated end …
Hybrid noise control in a duct using a light micro-perforated plate
A plate silencer consists of an expansion chamber with two side-branch cavities covered by
light but extremely stiff plates. It works effectively with a wide stopband from low-to-medium …
light but extremely stiff plates. It works effectively with a wide stopband from low-to-medium …
Strouhal number dependency of the aero-acoustic response of wall perforations under combined grazing-bias flow
EMT Moers, D Tonon, A Hirschberg - Journal of Sound and Vibration, 2017 - Elsevier
The influence of low Mach number grazing-bias flow on the linear acoustic response of slit
shaped wall perforations is determined in terms of a dimensionless acoustical impedance …
shaped wall perforations is determined in terms of a dimensionless acoustical impedance …
The Effect of deviation due to the manufacturing accuracy in the parameters of an MPP on its acoustic properties: Trial production of MPPs of different hole shapes …
K Sakagami, M Kusaka, T Okuzono, S Nakanishi - Acoustics, 2020 - mdpi.com
In this study, we discuss the effect of the manufacturing accuracy of a microperforated panel
(MPP) produced by 3D printers on acoustic properties through measured and calculated …
(MPP) produced by 3D printers on acoustic properties through measured and calculated …