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Acoustics, Volume 5, Issue 4

December 2023 - 17 articles

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Cover Story: Computing backscattering of harmonic acoustic waves from arbitrary underwater elastic targets is a problem of considerable practical significance. The finite element method is commonly coupled with the boundary element method, but such models tend to be expensive, due to large, dense, and complex matrices, and the need to solve systems of algebraic equations for each frequency of interest. We developed a model reduction of the surface pressures based on spatial coherence that greatly reduces the size of the systems. We found that the approach delivers acceptable results at a fraction of the cost of the full model. Backscattering computations with considerably larger models than have been feasible to date are now possible. View this paper

Articles (17)

  • Article
  • Open Access
2 Citations
2,491 Views
14 Pages

18 December 2023

The current state of the art in hydroacoustics research employs a variety of feature extraction techniques with the goal of accurately classifying a ship based on its radiated noise. These techniques are capable of accuracy in excess of 95%. A questi...

  • Article
  • Open Access
1 Citations
3,063 Views
19 Pages

11 December 2023

Understanding the impact of room acoustics on non-native listeners is crucial, particularly in standardized English as a foreign language (EFL) proficiency testing environments. This study aims to elucidate how acoustics influence test scores, consid...

  • Article
  • Open Access
2,974 Views
13 Pages

Active Control of the Reflection Coefficient of an Underwater Surface

  • Johannes Timmermann,
  • Norbert Hövelmann and
  • Delf Sachau

8 December 2023

From a strategic point of view, it is essential to protect underwater vehicles from being detected by opponents. Modern mono- or bistatic sonar systems are capable of precisely determining the position of a watercraft. In order to triangulate the pos...

  • Article
  • Open Access
2,897 Views
12 Pages

Comparison of the Declared and Simulated Real-Use Noise Data during Wood Sanding Using a Hand-Held Power Sander

  • Miroslav Dado,
  • Marián Schwarz,
  • Jozef Salva,
  • Richard Jankovič and
  • Richard Hnilica

7 December 2023

The hand-held power sander is a frequently used tool in woodworking, and it is a significant source of risk in terms of dust, vibration, and, notably, noise. The purpose of a hand-held power sander manufacturer’s noise emission statement is to...

  • Article
  • Open Access
2 Citations
3,671 Views
13 Pages

3 December 2023

The use of acoustic liners, based on double-degree-of-freedom Helmholtz resonators, for low-frequency-noise attenuation is limited by the volume of individual resonating cavities. This study investigates the effect of the septum neck length on the ac...

  • Article
  • Open Access
8 Citations
5,240 Views
24 Pages

Performance Evaluation of Nord2000, RTN-96 and CNOSSOS-EU against Noise Measurements in Central Jutland, Denmark

  • Jibran Khan,
  • Erik Thysell,
  • Claus Backalarz,
  • Per Finne,
  • Ole Hertel and
  • Steen Solvang Jensen

21 November 2023

This article aims to assess the performance of Nord2000, RTN-96, and CNOSSOS-EU, the Nordic and European noise prediction standards, in predicting daily LAeq24h and Lden levels (dBA), by comparing them with measurements gathered over 76 days from the...

  • Article
  • Open Access
3 Citations
2,894 Views
33 Pages

14 November 2023

The accurate prediction of noise levels at outdoor locations requires detailed data of the noise sources and terrain parameters and an efficient model for prediction. However, the possibility of predicting noise with reasonable accuracy using less in...

  • Article
  • Open Access
4 Citations
3,489 Views
20 Pages

2 November 2023

This study presents a data-driven approach to identifying anomaly-sensitive parameters through a multiscale, multifaceted analysis of simulated respiratory flows. The anomalies under consideration include a pharyngeal model with three levels of const...

  • Review
  • Open Access
6 Citations
8,642 Views
10 Pages

Importance of Noise Hygiene in Dairy Cattle Farming—A Review

  • Dimo Dimov,
  • Toncho Penev and
  • Ivaylo Marinov

1 November 2023

Noise is defined as unwanted sound, whether chronic or periodic, and can be described in a variety of terms, including its frequency, intensity, frequency spectrum, and sound pressure shape over time. The sources of noise can be technical devices, va...

  • Article
  • Open Access
1 Citations
2,475 Views
20 Pages

31 October 2023

Computing backscattering of harmonic acoustic waves from underwater elastic targets of arbitrary shape is a problem of considerable practical significance. The finite element method is commonly applied to the discretization of the target; on the othe...

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