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Symmetry
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Symmetry in Acoustics and Acoustic Engineering
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Symmetry in Acoustics and Acoustic Engineering

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Engineering and Materials".

Deadline for manuscript submissions: closed (10 April 2023) | Viewed by 2078

Special Issue Editor

Dr. Ovidiu Vasile

E-Mail Website
Guest Editor
Department of Mechanics, University Politehnica of Bucharest, 060042 Bucharest, Romania
Interests: mechanics; acoustics; silencer; vibration; isolation systems
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Noise is seen as a disruptive factor in various situations. In order to reduce the undesirable effects of noise in the built environment or in engineering, taking into account symmetry/asymmetry conditions, a variety of methods can be developed to reduce noise, control sound waves, or use new materials with improved acoustic characteristics.

The purpose of this Special Issue of the journal Symmetry is to present some recent developments as well as possible future directions for symmetry/asymmetry in sound wave control methods or various materials in symmetric/asymmetric structure with noise reduction properties. The articles presented in this Special Issue will cover various topics that, in addition to the concept of symmetry, have a significant influence on noise reduction using intelligent methods of active/passive control of sound waves, advanced/composite materials and multilayer with the role of sound absorption/insulation, mathematical simulations, and experimental tests of acoustics properties in practical approaches.

Dr. Ovidiu Vasile
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Symmetry is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • sound wave
  • noise control
  • sound absorption
  • sound insulation
  • material structures
  • composite materials
  • advanced materials
  • mathematical simulations
  • multilayer structures

Published Papers (2 papers)

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Research

16 pages, 2683 KiB  
Article
The Impact of Sound Pressure Level, Loudness, Roughness, Sharpness, Articulation Index, Hand Vibration, and Seat Vibration on Subjective Comfort Perception of Tractor Drivers
by Zhipeng Wang, Yanyan Zuo and Liming Sun
Symmetry 2023, 15(7), 1317; https://0-doi-org.brum.beds.ac.uk/10.3390/sym15071317 - 27 Jun 2023
Viewed by 1063
Abstract
Long-term exposure to high levels of vibration and noise can have detrimental effects on the health of tractor drivers. This study aimed to evaluate the subjective comfort experienced by drivers operating large-horsepower tractors. A total of 10 tractors sourced from 5 different manufacturers [...] Read more.
Long-term exposure to high levels of vibration and noise can have detrimental effects on the health of tractor drivers. This study aimed to evaluate the subjective comfort experienced by drivers operating large-horsepower tractors. A total of 10 tractors sourced from 5 different manufacturers were subjected to testing. The assessment encompassed three operational conditions, namely, idle, maximum torque, and rated power. Objective measurements, including A-weighted sound pressure level (A-SPL), loudness, sharpness, roughness, articulation index (AI), hand vibration, and seat vibration, were collected. Additionally, subjective comfort evaluations were carried out using a paired comparison test. To predict the subjective comfort of tractor drivers, a novel prediction model was developed by employing a simulated annealing (SA) algorithm to optimize a backpropagation neural network (BPNN). The model successfully achieved accurate predictions of subjective comfort, yielding a maximum prediction error of 4.4%. The study findings revealed that vibration had a more pronounced impact on driver comfort in environments with lower-amplitude noise, whereas high-decibel noise exerted a masking effect on vibration-induced discomfort. In conclusion, the SA-BPNN model, utilizing A-SPL, loudness, sharpness, roughness, AI, hand vibration, and seat vibration as objective parameters, effectively predicted the subjective comfort of tractor drivers. This discovery holds significant implications for tractor manufacturers, who can employ the model to optimize the design of tractor cabs and enhance driver comfort. Full article
(This article belongs to the Special Issue Symmetry in Acoustics and Acoustic Engineering)
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12 pages, 4650 KiB  
Article
Acoustic Modeling of Compressible Jet from Chevron Nozzle: A Comparison of URANS, LES and DES Models
by Sakthi Prakash Murugu, A. R. Srikrishnan, Bharath Kumar Krishnaraj, Anguraj Jayaraj, Akram Mohammad and Ratna Kishore Velamati
Symmetry 2022, 14(10), 1975; https://0-doi-org.brum.beds.ac.uk/10.3390/sym14101975 - 21 Sep 2022
Cited by 3 | Viewed by 1408
Abstract
Chevron nozzles, which are characterized by the serrations at the nozzle exit, are widely used for suppressing jet noise in aircraft engines. The noise suppression is accomplished by the enhanced mixing of the exhaust streams, which, in turn, is a result of the [...] Read more.
Chevron nozzles, which are characterized by the serrations at the nozzle exit, are widely used for suppressing jet noise in aircraft engines. The noise suppression is accomplished by the enhanced mixing of the exhaust streams, which, in turn, is a result of the streamwise vorticity induced by the serrations. The present study focuses on the numerical modeling of the acoustic field in a compressible jet issuing from a chevron nozzle at a Mach number of 0.8. The study evaluates the effectiveness of turbulence modeling approaches of Large Eddy Simulation and Detached Eddy Simulation methods and compares them with the less computationally intensive Unsteady Reynolds Averaged Navier–Stokes (URANS) formulation. The Ffowcs Williams–Hawkings noise model was used to predict the overall sound pressure level in the far field. The LES predictions of the acoustic signature were found to match well with the experimental data, whereas the URANS model grossly underpredicted the sound pressure levels in the compressible jet flow field. Full article
(This article belongs to the Special Issue Symmetry in Acoustics and Acoustic Engineering)
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