Results 31 to 40 of about 22,575 (260)

Archimedean spiral channel-based acoustic metasurfaces suppressing wide-band low-frequency noise at a deep subwavelength

Materials & Design
Suppression of low-frequency noise suppression is of high engineering importance. However, representative solution micro-perforated panels have limitations, including narrow effective sound absorption bands at low frequencies and excessive thickness.
Xingfa Yang, Guilin Wen, Linjie Jian, Chunguan Lin, Junfeng He, Ramin Sedaghati, Shuzhen Huang, Jie Liu, Yi Min Xie   +8 more
doaj   +1 more source

Acoustical Evaluation and Comparative Study of Maple Leaves and Coir and Polyester Fibers

Journal of Natural Fibers, 2022
In the last few years, concerns about the adverse effects of petroleum-based materials on the environment and public health have gradually increased. It is worthy and meaningful to find natural materials to substitute the conventional synthetic sound ...
Tao Yang, Lizhu Hu, Xiaoman Xiong, Mohanapriya Venkataraman, Michal Petrů, Jan Novák, Jiří Militký   +6 more
doaj   +1 more source

Low-Frequency Dual-Band Sound Absorption by Ultrathin Planar Wall Embedded With Multiple-Cavity Resonators

Frontiers in Physics, 2022
We report the numerical and experimental realization of a type of ultrathin planar wall with low-frequency dual-band sound absorption. The proposed planar wall is constructed by a periodic subwavelength unit cell (with a thickness of λ/19) which consists
Yu-wei Xu, Yi-jun Guan, Yi-jun Guan, Yi-jun Guan, Jia-li Yin, Yong Ge, Hong-xiang Sun, Hong-xiang Sun, Shou-qi Yuan, Xiao-jun Liu, Xiao-jun Liu   +10 more
doaj   +1 more source

DigiChrom: A Domain Ontology for Semantic Representation of Trivalent Chromium Platings and Its Large Language Model‐Based Alignment With Multiple Mid‐Level Ontologies

Advanced Engineering Materials, EarlyView.
Digitalizing electroplating requires both domain knowledge and interoperability. This work introduces PlatOn, a domain ontology for trivalent chromium plating and coating characterization, and a hybrid pipeline that aligns it to a mid‐level reference ontology by combining eight similarity metrics with language model reasoning. Expert‐validated mappings
Janik Harter, Elena Garcia Trelles, Christoph Schweizer, Thomas Seifert, Christoph Baumer, Mahmoud Elkady, Katja Feige, Daniel Grimme, Edgar Hoffmann, Andreas Waibel, Anke Walter   +10 more
wiley   +1 more source

Adaptive Foam 3D Printing of Ultralight and Multifunctional Materials

Advanced Engineering Materials, EarlyView.
Adaptive foam 3D printing, enabled by expandable microspheres, imparts cellular structures to thermoplastic and thermosetting polymers, manufactured through a variety of processes including fused filament fabrication, direct ink writing, digital light processing, and inkjet printing.
Nariman Rajabifar, Amir Ameli
wiley   +1 more source

Investigation of Acoustic Properties on Wideband Sound-Absorber Composed of Hollow Perforated Spherical Structure with Extended Tubes and Porous Materials

Applied Sciences, 2020
Traditional porous media such as melamine foam absorb sound due to their three-dimensional porous struts. However, the acoustic properties at low frequencies are greatly related to its thickness.
Dengke Li, Zhongcheng Jiang, Lin Li, Xiaobo Liu, Xianfeng Wang, Mu He   +5 more
doaj   +1 more source

High‐Entropy Alloy Interlayers Toward Advanced Joining for High‐Performance Structural Applications: Current Progress and Emerging Challenges

Advanced Engineering Materials, EarlyView.
HEA interlayers offer a versatile route for joining high‐performance structural materials. Their compositional and structural design regulates interfacial reactions, suppresses brittle IMCs, and improves metallurgical bonding. Sandwich interlayers further integrate defect healing with precipitation strengthening, enabling improved strength–ductility ...
Lin Yuan, Jiafen Song, Jinglong Li, Jiangtao Xiong, Tao Yang   +4 more
wiley   +1 more source

Theoretical and experimental investigation on the sound absorption performance of ultra-thin curled acoustic metasurface

Journal of Low Frequency Noise, Vibration and Active Control
A simplified model of the absorption coefficient of traditional Helmholtz resonators (THR) was established, and the influence of different geometric parameters on the absorption coefficient of THR was analyzed.
Baozhu Cheng, Jiesen Zhang, Yang Liu, Jiaqi Sun, Bin Li, Hong Hou   +5 more
doaj   +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

Study for sound-absorbing materials of biomass tubule (Oblique incident sound-absorption coefficient of oblique arrangement of rice straws)

Nihon Kikai Gakkai ronbunshu, 2016
In this paper, we report the use of sound-absorbing materials, specifically sound-absorbing structures of bundled rice straws, that are oblique arranged incident to the sound waves.
Shuichi SAKAMOTO, Taisei TSURUMAKI, Kohei FUJISAWA, Koki YAMAMIYA   +3 more
doaj   +1 more source