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Acoustics
Special Issues
Machinery Noise: Emission, Modelling and Control
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Machinery Noise: Emission, Modelling and Control

A special issue of Acoustics (ISSN 2624-599X).

Deadline for manuscript submissions: 21 January 2025 | Viewed by 4502

Special Issue Editors

Prof. Dr. Wiesław Fiebig

E-Mail Website
Guest Editor
Department of Fundamentals of Machine Design and Mechatronic Systems, Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, 50-370 Wrocław, Poland
Interests: acoustics; machinery noise; vibration
Prof. Dr. Guoyong Jin

E-Mail Website
Guest Editor
College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China
Interests: structural dynamics and acoustics; vibration and noise of power machinery; vibration and noise control of marine power plant
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Machine noise is becoming more and more important due to increased power density of machines and stricter requirements for permissible noise levels. The development of strategies to reduce vibroacoustic hazards should involve efforts to reduce noise emission and exposure to vibration and noise. In this context, knowledge about vibrations and machinery noise is needed for modern research and calculation methods.

Machinery noise and vibrations occur primarily due to dynamical processes during the machine’s operation. Among the many causes of the noise, mechanical, liquid flow, and aerodynamic origins have been mentioned.

This Special Issue welcomes recent research papers on key topics concerning machinery noise. We encourage the submission of manuscripts that focus on, but are not limited to, the following topics:

  • Machinery noise sources and their location;
  • The measurement of vibroacoustic processes in machines;
  • Novel approaches for machinery vibration and noise modelling;
  • Noise emission from stationary and mobile machines;
  • Methods for controlling machinery noise; active noise control.

Prof. Dr. Wiesław Fiebig
Prof. Dr. Guoyong Jin
Guest Editors

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. Acoustics is an international peer-reviewed open access quarterly 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 1600 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

  • machinery noise
  • noise sources
  • noise sources location
  • noise measurement
  • vibration and noise modelling
  • noise control
  • noise transmission paths
  • active noise control

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Published Papers (2 papers)

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Research

15 pages, 9097 KiB  
Article
Acoustic Analysis of a Hybrid Propulsion System for Drone Applications
by Mădălin Dombrovschi, Marius Deaconu, Laurentiu Cristea, Tiberius Florian Frigioescu, Grigore Cican, Gabriel-Petre Badea and Andrei-George Totu
Acoustics 2024, 6(3), 698-712; https://doi.org/10.3390/acoustics6030038 - 25 Jul 2024
Viewed by 1629
Abstract
This paper aims to conduct an acoustic analysis through noise measurements of a hybrid propulsion system intended for implementation on a drone, from which the main noise sources can be identified for further research on noise reduction techniques. Additionally, the noise was characterized [...] Read more.
This paper aims to conduct an acoustic analysis through noise measurements of a hybrid propulsion system intended for implementation on a drone, from which the main noise sources can be identified for further research on noise reduction techniques. Additionally, the noise was characterized by performing spectral analysis and identifying the tonal components that contribute to the overall noise. The propelling force system consists of a micro-turboshaft coupled with a gearbox connected to an electric generator. The propulsion system consists of a micro-turboshaft coupled with a gearbox connected to an electric generator. The electric current produced by the generator powers an electric ducted fan (EDF). The engineturbo-engine was tested in free-field conditions for noise generation at different speeds, and for this, an array of microphones was installed, positioned polarly around the system and near the intake and exhaust. Consequently, based on the test results, the acoustic directivity was plotted, revealing that the highest noise levels are at the front and rear of the engine. The noise level at a distance of 1.5 m from the turboengine exceeds 90 dBA at all tested speeds. Spectral analyses of both the far-field acoustic signals (measured with a polar microphone array) and the near-field signals (microphones positioned near the intake and exhaust) revealed that the primary contributors to the overall noise are the micromotor’s compressor, specifically the gas dynamic phenomena in the fan (BPF and 2× BPF). Thus, it was determined that at the intake level, the main noise contribution comes from the high-frequency components of the compressor, while at the exhaust level, the noise mainly originates from the combustion chamber, characterized by low-frequency components (up to 2 kHz). The findings from this study have practical applications in the design and development of quieter drone propulsion systems. By identifying and targeting the primary noise sources, engineers can implement effective noise reduction strategies, leading to drones that are less disruptive in urban environments and other noise-sensitive areas. This can enhance the acceptance and deployment of drone technology in various sectors, including logistics, surveillance, and environmental monitoring. Full article
(This article belongs to the Special Issue Machinery Noise: Emission, Modelling and Control)
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27 pages, 25984 KiB  
Article
Machine Noise—Experimental Study of the Local Environmental Correction for the Emission Sound Pressure Level
by Fabian Heisterkamp
Acoustics 2024, 6(1), 177-203; https://doi.org/10.3390/acoustics6010010 - 8 Feb 2024
Viewed by 1948
Abstract
Determining reliable noise emission values for machinery is key to successfully implement the Sell and Buy Quiet concept. ISO 11202 is a basic noise emission standard to determine the emission sound pressure level of machines outside of special acoustic test rooms (in situ [...] Read more.
Determining reliable noise emission values for machinery is key to successfully implement the Sell and Buy Quiet concept. ISO 11202 is a basic noise emission standard to determine the emission sound pressure level of machines outside of special acoustic test rooms (in situ measurements) and enables machinery manufacturers to determine the noise emission data of their products within their own premises. However, a recent amendment to this standard was made on the basis of an unsatisfactory amount of experimental data. Therefore, this paper systematically examines the validity and accuracy of the amended part of the method. It answers the question, whether the amendment represents an improvement of the existing method. Measurements on a model machine with two configurations allow for an extensive investigation of the effects of the amendment. To that end, the emission sound pressure levels at eight positions near the machine are determined in three different acoustic environments. One finds that the amendment leads to an overestimation of the local environmental correction for the LpA, which, in turn, could lead to an underestimation of the determined emission sound pressure level. Full article
(This article belongs to the Special Issue Machinery Noise: Emission, Modelling and Control)
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