Results 71 to 80 of about 2,768,062 (267)

Ultrathin acoustic metamaterial as super absorber for broadband low-frequency underwater sound

Scientific Reports, 2023
In this work, an ultrathin acoustic metamaterial formed by space-coiled water channels with a rubber coating is proposed for underwater sound absorption. The proposed metamaterial achieves perfect sound absorption ( $$\alpha$$ α  > 0.99) at 181 Hz, which
Xindong Zhou, Xiaochen Wang, Fengxian Xin   +2 more
doaj   +1 more source

Hybrid ultrathin metasurface for broadband sound absorption [PDF]

Appl. Phys. Lett. 124, 151702 (2024)
To this day, achieving broadband low-frequency sound absorption remains a challenge even with the possibilities promised by the advent of metamaterials and metasurfaces, especially when size and structural restrictions exist. Solving this engineering challenge relies on stringent impedance matching and coupling of the multiple independent local ...
arxiv   +1 more source

Fiber Weight Fraction Effect to Acoustic Properties of RHDPE Cantula Composite

Mekanika, 2017
In this study, composites made from recycled HDPE and Cantula fiber have been done and the absorption coefficient have been measured. Composites rHDPE-Cantula were made using hot press for approximately 60 minutes with 170oC temperature while pressure ...
Muhammad Taufik Burhany Hendrowarsito, Wijang Wisnu Raharjo, Dwi Aries Himawanto   +2 more
doaj   +1 more source

Acoustic Characterization of Sugarcane Bagasse Particleboard Panels (Saccharum officinarum L) [PDF]

Materials Research, 2015
The use of sugarcane bagasse minimizes the environmental impact and contributes to the creation of a new product with low density, good sound absorption capacity and can improve the acoustic conditions of buildings.
Sylvia Thais Martins Carvalho, Lourival Marin Mendes, Antonia Amanda da Silva Cesar, Jeimy Blanco Flórez, Fábio Akira Mori, Giovanni Francisco Rabelo   +5 more
doaj   +2 more sources

Mechanical and sound absorption performance of addition type liquid silicone rubber reinforced with halloysite nanotubes

Materials Research Express, 2021
Addition-molded room temperature vulcanized liquid silicone rubber (LSR) has become the promising candidate for environmentally friendly sound-absorbing materials, but the absorption efficiency should be further improved.
Longgui Peng, Lei Lei, Yongqiang Liu, Lifei Du   +3 more
doaj   +1 more source

Design and Simulation Analysis of Sound Absorption Structure for Acoustic Detection-Based Underwater Gliders

水下无人系统学报
The radiation noise of mechanical noise has a significant impact on the acoustic detection performance of acoustic detection-based underwater gliders. In order to address this problem, this paper introduced sound absorption structure into the study of ...
Donghai ZENG, Xinyu WU, Chang YUAN, Yuxuan PENG, Jianxing ZHANG, Baoren LI   +5 more
doaj   +1 more source

Influences of Compression Ratios on Sound Absorption Performance of Porous Nickel–Iron Alloy

Metals, 2018
The improvement of sound absorption performance of porous metal is a focus of research in the field of noise reduction. Influences of compression ratios on sound absorption performance of a porous nickel–iron (Ni–Fe) alloy were investigated.
Panfeng Bai, Xinmin Shen, Xiaonan Zhang, Xiaocui Yang, Qin Yin, Anxin Liu   +5 more
doaj   +1 more source

Sound absorption and reflection with coupled tubes [PDF]

, 2000
This paper describes a special sound absorbing technique with an accompanying efficient numerical design tool. As a basis pressure waves in a single narrow tube or pore are considered. In such a tube the viscosity and the thermal conductivity of the air,
Eerden, Frits van der
core   +1 more source

Study on the sound absorption characteristics and noise reduction mechanism of coconut-shell-activated carbon particles and coconut fiber composite biomass sound-absorption materials

Materials Research Express
Sound-absorbing materials are widely used in the field of automotive industry. Biomass materials are abundant in the nature, some of which have natural sound absorption and noise reduction properties.
Zhenhua Hou, Xiaoying Ma, Liai Pan, Rui Zhang, Libo Wang   +4 more
doaj   +1 more source

Design and Compare Sound Absorption Coefficient Nanocomposites Containing Tea Waste and Polypropylene With and Without Nanoclay

بهداشت و ایمنی کار, 2021
Introduction: In recent years tend to use of natural fibers has increased in making sound absorbers. Fiber-based natural materials have low density, low production costs, and are biodegradable.
Reza Jafari Nodoushan, Mostafa Azimzadeh, Sahar Bagheri, Arefeh Dehghani Tafti   +3 more
doaj