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Chukwuemeke William Isaac, Marek Pawelczyk and Stanislaw Wrona
The increasing motivation behind the recently wide industrial applications of sandwich and composite double panel structures stems from their ability to absorb sounds more effectively. Meticulous selection of the geometrical and material constituents of ...
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Anuj Rekhy, Robert Snyder and James M. Manimala
Conventional acoustic absorbers like foams, fiberglass or liners are used commonly in structures for industrial, infrastructural, automotive and aerospace applications to mitigate noise. However, these have limited effectiveness for low-frequencies (LF, ...
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Abhishek Gautam, Alper Celik and Mahdi Azarpeyvand
This study investigates the acoustic performance of a system of two Helmholtz resonators experimentally and numerically. The distance between the Helmholtz resonators was varied to assess its effect on the acoustic performance of the system quantitativel...
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Yaxi Peng, Apostolos Tsouvalas, Tasos Stampoultzoglou and Andrei Metrikine
Underwater noise pollution generated by offshore pile driving has raised serious concerns over the ecological impact on marine life. To comply with the strict governmental regulations on the threshold levels of underwater noise, bubble curtains are usual...
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Linus Yinn Leng Ang, Yong Khiang Koh and Heow Pueh Lee
For industrial applications, the scalability of a finalised design is an important factor to consider. The scaling process of typical membrane-type acoustic metamaterials may pose manufacturing challenges such as stress uniformity of the membrane and spa...
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Daniel Deery, Lara Flanagan, Gordon O?Brien, Henry J. Rice and John Kennedy
Significant potential for acoustic metamaterials to provide a breakthrough in sound attenuation has been unlocked in recent times due to advancements in additive manufacturing techniques. These materials allow the targeting of specific frequencies for so...
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Mi Li and Jianjun He
The depth of electrodes inserted into the charge plays a vital role in controlling the submerged arc furnace. Therefore, we used ultrasound waves reflected from the electrode tip to estimate the depth of electrodes inserted into the charge. However, grap...
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Zhenhua Hou, Qigan Wang, Shiqiang Zhang, Tengfei Si, Tiange Li and Zhijun Zhang
The exhaust tailpipe of a certain type of tractor was improved from the perspective of bionics, and bionic triangular convex texture was added to the inner surface of the exhaust tailpipe. The bionic tailpipe was proposed to improve noise reduction perfo...
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Sourabh Dogra and Arpan Gupta
Acoustic metamaterials are materials artificially engineered to control sound waves, which is not possible with conventional materials. We have proposed a design of an acoustic metamaterial plate with inbuilt Helmholtz resonators. The plate is made of Po...
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Jiaqi Liu, Shengchun Piao, Minghui Zhang, Shizhao Zhang, Junyuan Guo and Lijia Gong
Oceanic fronts involved by ocean currents led to strong gradients of temperature, density and salinity, which have significant effects on underwater sound propagation. This paper focuses on the impact of the oceanic front on three-dimensional underwater ...
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Hong Liu, Qiulong Yang and Kunde Yang
Geoacoustic inversion is an efficient method to study the physical properties and structure of ocean bottom while sequential geoacoustic inversion is a challenging task due to the complexity and non-linearity of the underwater environment. In this paper,...
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Ruoyun Liu and Zhenglin Li
As sea waves break, a bubble layer forms beneath the sea surface. The bubble scattering affects sound propagation, thus influencing the accuracy of sound field prediction. This paper aims to investigate the effects of bubble scattering on the statistical...
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Abhishek Gautam, Alper Celik and Mahdi Azarpeyvand
The use of acoustic liners, based on double-degree-of-freedom Helmholtz resonators, for low-frequency-noise attenuation is limited by the volume of individual resonating cavities. This study investigates the effect of the septum neck length on the acoust...
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Brandon M. Lee, Jay R. Johnson and David R. Dowling
Computational predictions of acoustic transmission loss (TL) in ocean environments depend on the relevant environmental characteristics, such as the sound speed field, bathymetry, and seabed properties. When databases are used to obtain estimates of thes...
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Alexis Caron-Rousseau, Pierre Blanchet and Louis Gosselin
While externally insulated wall assemblies are widely recognized for their hygrothermal performance, few research projects have focused on the impact of shifting the entire wall insulation to the exterior side of a structural cavity in cold or subarctic ...
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Giovanni Fasulo, Pasquale Vitiello, Luigi Federico and Roberto Citarella
The purpose of this work is to characterise the vibro-acoustic behaviour of rectangular flat panels reinforced by ?unconventional? stiffeners. Such panels are being increasingly employed in the aircraft industry in the case of composite fuselage, so that...
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Andrey Lunkov, Danila Sidorov and Valery Petnikov
Three-Dimensional (3-D) sound propagation in a shallow-water waveguide with a constant depth and inhomogeneous bottom is studied through numerical simulations. As a model of inhomogeneity, a transitional region between an acoustically soft and hard botto...
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Svein Vagle, Rianna E. Burnham, Caitlin O?Neill and Harald Yurk
Oceanic acoustic environments are dynamic, shaped by the spatiotemporal variability in transmission losses and sound propagation pathways of natural and human-derived noise sources. Here we used recordings of an experimental noise source combined with tr...
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Linke Zhang, Na Wei, Xuhao Du and Shuping Wang
Identifying changes in the properties of acoustical sources based on a small number of sample data from measurements has been a challenge for decades. Typical problems are the increasing sound power from a vibrating source, decreasing transmission loss o...
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Wei Liu, Lilun Zhang, Yongxian Wang, Xinghua Cheng and Wenbin Xiao
Acoustic particle velocities can provide additional energy flow information of the sound field; thus, the vector acoustic model is attracting increasing attention. In the current study, a vector wavenumber integration (VWI) model was established to provi...
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