Results 61 to 70 of about 1,334 (158)

Flow Field Noise Analysis and Noise Reduction Research of Twin-Screw Air Compressor Based on Multi-Field Coupling Technology

Machines
To address the flow field noise problem in twin-screw air compressors, multi-physical-field coupling technology is employed to perform flow field noise calculations for the compressor.
Yayin He, Xuyang He, Lijun Chen, Junli Wang, Yongqiang Zhao, Zhigui Ren   +5 more
doaj   +1 more source

Noise Elimination of a Multi-tone Broadband Noise with Hybrid Helmholtz Mufflers Using a Simulated Annealing Method

Archives of Acoustics, 2013
Noise control is essential in an enclosed machine room where the noise level has to comply with the occupational safety and health act. In order to overcome a pure tone noise with a high peak value that is harmful to human hearing, a traditional ...
Min-Chie CHIU
doaj  

Innovative solution to enhance the Helmholtz resonator sound absorber in low-frequency noise by nature inspiration. [PDF]

J Environ Health Sci Eng, 2020
Basirjafari S.
europepmc   +1 more source

Numerical investigation on acoustic damping characteristics of dual Helmholtz resonators in presence of a grazing flow

Journal of Low Frequency Noise, Vibration and Active Control
In this study, the acoustic damping performances of the dual Helmholtz resonators were numerically evaluated using a 3D model. The grazing flow passes tangentially through the resonator neck, with a Mach number range of 0 ≤ Ma ≤ 0.1.
He Zhao, Dan Zhao, Xu Dong
doaj   +1 more source

Helmholtz Resonance in a Water Bottle

International Scholastic Journal of Science, 2011
The resonance that occurs when blowing across the top of a water bottle filled with different volumes of water was studied. It was shown that, contrary to popular belief, a water bottle is not an ideal Helmholtz resonator. Resonance in a water bottle
Annirudh Balachandran,, Fuyuki Watanabe, Joshua Lim   +2 more
doaj  

Two approaches to the solution of resonance and guiding girotropic filling structures boundary value problems

Физика волновых процессов и радиотехнические системы, 2015
The T and L methods of boundary value problems solving to concern electrodynamic girotropic filling structures have been developed in the cylindrical coordinate system.
E.A. Mihalitsyn, A.S. Raevsky, A.Yu. Sedakov   +2 more
doaj  

Helmholtz resonator [PDF]

, 2018
openaire   +1 more source

Checkerboard Helmholtz Resonator Metasurface for Dual-Mode Decoupled Dual-Band Coherent Perfect Absorption with Independently Tunable Frequencies. [PDF]

Micromachines (Basel)
Liu Z, Liu W, Du Z, Yang R.
europepmc   +1 more source

Tunable sensing properties of a Helmholtz resonator array featuring a central defect cell with four lateral ducts. [PDF]

Sci Rep
Zaky ZA, Hennache A, Antraoui I, El Malki M, Khettabi A, Zaky MA, Sallah M.   +6 more
europepmc   +1 more source

Design of a parallel Helmholtz resonator structure as a hazardous greenhouse gases sensor using the transfer matrix method. [PDF]

Sci Rep
Antraoui I, Guesmi A, El Malki M, Hamadi NB, El-Fattah WA, Khettabi A, Zaky ZA.   +6 more
europepmc   +1 more source