Results 51 to 60 of about 2,485,601 (152)

Physical Bounds on Underwater Sound Absorption by Coatings

Acoustics
The development of sound-absorbing coatings for underwater structures has attracted significant attention due to their critical role in stealth and noise mitigation.
James McDaniel, Gerson Amaya, Lisa Dangora, Elizabeth Magliula   +3 more
doaj   +1 more source

A tunable high-order micro-perforated panel metamaterial with low-frequency broadband acoustic absorption

Applied Physics Express
We proposed a tunable high-order micro-perforated panel metamaterial for broadband absorption, in which the energy dissipation modes is reconstructed by the cavity partition plates.
Chongrui Liu, Xiaoli Liu, Zexiang Xie, Jiu Hui Wu, Fuyin Ma   +4 more
doaj   +1 more source

An application of a parametric transducer to measure acoustic absorption of a living green wall

Applied Acoustics, 2019
This work reports on a new method to measure the absorption coefficient of a Living Green Wall (LGW) in-situ. A highly directional parametric transducer and acoustic intensity probe are used to make this method robust against background noise and ...
A. Romanova, K. Horoshenkov, Alistair Hurrell   +2 more
semanticscholar   +1 more source

Sound Absorption of Hydroponically Grown Plants

Acoustics
Hydroponics is a method of growing plants without soil and serves as an efficient agricultural production system. Compared to traditional farming, hydroponic crops offer significant water savings while also reducing the need for chemical pesticides by ...
Gino Iannace, Antonella Bevilacqua, Amelia Trematerra, Giovanni Amadasi   +3 more
doaj   +1 more source

Sound Absorption Property of Polyurethane Foam with Polyethylene Fiber

Medžiagotyra, 2019
Flexible polyurethane (PU) foams with varying polyethylene fiber contents were synthesized to improve their acoustic performances. The purpose of this study was to investigate the effects of different polyethylene fiber contents of the PU foams on the ...
Tongtong ZHU, Shuming CHEN, Wenbo ZHU, Yebin WANG, Yang JIANG   +4 more
doaj   +1 more source

Methodology for Testing Acoustic Absorption of Lightweight Fabrics with 3D Microstructures Using Impedance Tube

Acoustics
In this study, the limits of using the impedance tube, or Kundt tube, are examined using the two-microphone method to obtain the normal acoustic absorption coefficient when analyzing the sound absorption properties of lightweight acoustic fabrics ...
David Caballol, Mónica Morales-Segura, Alejandro Morgado   +2 more
doaj   +1 more source

Experimental Study of Advanced Helmholtz Resonator Liners with Increased Acoustic Performance by Utilising Material Damping Effects

Applied Sciences, 2018
In aero engines, noise absorption is realised by acoustic liners, e.g., Helmholtz resonator (HR) liners, which often absorb sound only in a narrow frequency range.
Martin Dannemann, Michael Kucher, Eckart Kunze, Niels Modler, Karsten Knobloch, Lars Enghardt, Ennes Sarradj, Klaus Höschler   +7 more
doaj   +1 more source

Acoustic absorption and thermal insulation of wood panels: Influence of porosity

BioResources, 2019
The development of materials that offer environmental comfort inside buildings, through adequate thermal and acoustic behavior, has been as relevant as the search for raw materials of renewable origin.
M. S. Bertolini, C. A. G. D. Morais, A. Christoforo, S. Bertoli, W. N. D. Santos, F. Lahr   +5 more
semanticscholar   +1 more source

Low-frequency broadband sound absorption in a parallel truncated-tail sonic black hole

Zhongguo Jianchuan Yanjiu
ObjectiveThis study systematically investigates the acoustic characteristics of low-frequency broadband parallel truncated-tail sonic black holes (TSBH) absorbers, with a particular focus on their broadband sound absorption performance.
Zhihan LI, Jinglun CHEN, Xiaohai SHEN, Yonghua YU, Weichun HUANG, Minghui LU, Yanfeng CHEN   +6 more
doaj   +1 more source

Utilization of Disposable Mask Waste and Coconut Fiber as an Acoustic Composite Material

Dimensi: Journal of Architecture and Built Environment
This research aims to utilize disposable mask waste and coconut fiber as an acoustic composite material and identify its sound absorption characteristics. The method used in this research is an experiment to produce four samples with different non-woven
Khairunnissa Ramadhani, Arrizal Abdul Aziz, Miftahul Akbar Ramadhan, Amara Huaida Alifah, Try Ramadhan   +4 more
doaj   +1 more source