Pipe noise prediction and sound insulation design by using modelling and field measurements.

2010 ◽  
Vol 127 (3) ◽  
pp. 1766-1766
Author(s):  
Giuseppe Squadrone
Keyword(s):  
Field Measurements ◽  
Sound Insulation ◽  
Noise Prediction

scholarly journals Nozzles, turbulence, and jet noise prediction

2018 ◽  
Vol 860 ◽  
pp. 1-4 ◽  
Author(s):  
Jonathan B. Freund
Keyword(s):  
Prediction Accuracy ◽  
Jet Noise ◽  
Sound Field ◽  
Field Measurements ◽  
Detailed Comparison ◽  
Large Eddy Simulations ◽  
Noise Prediction ◽  
Large Eddy ◽  
Modelling Procedure ◽  
Flow Turbulence

Jet noise prediction is notoriously challenging because only subtle features of the flow turbulence radiate sound. The article by Brès et al. (J. Fluid Mech., vol. 851, 2018, pp. 83–124) shows that a well-constructed modelling procedure for the nozzle turbulence can provide unprecedented sub-dB prediction accuracy with modest-scale large-eddy simulations, as confirmed by detailed comparison with turbulence and sound-field measurements. This both illuminates the essential mechanisms of the flow and facilitates prediction for engineering design.

Case Study: Laboratory and Field Measurements for Evaluating the Weighted Reduction in Impact Noise Associated with Floor Coverings

2002 ◽  
Vol 9 (2) ◽  
pp. 151-162 ◽  
Author(s):  
Jorge Patrício
Keyword(s):  
Field Measurements ◽  
Design Stage ◽  
Sound Insulation ◽  
Horizontal Beam ◽  
Impact Noise ◽  
Loudness Level ◽  
Floor Coverings ◽  
The Difference ◽  
Study Laboratory

In order that impact sound insulation in buildings complies with national regulations, the use of floor coverings needs to be considered, either at the design stage, or as a corrective measure. The improvement of impact sound insulation for floor coverings shown in marketing literature, comes from laboratory tests, expressed as the difference between the values of bare and covered floor noise insulation indices, calculated in accordance with what is prescribed in standard EN ISO 717/2. However, the values of the improvement for the same product are sometimes very different from laboratory to on-site conditions. This problem is more acute for buildings with non-homogenous floors such as beam-block. This case study presents some tests performed on identical horizontal beam-block slabs, in the laboratory and on site, using the same floor coverings. Discrepancies in the values obtained for the characterisation of each floor covering are observed. Assuming that part of the problem could be linked to the type of index used, a comparison is made using the following metrics: ΔdB(A); ΔLn,w (or ΔL3n,w – when on site); and the difference of Loudness Level.

Analysis of Sound Insulation Performance of Reinforce Concrete Walls between Households According to Wall Thickness Criteria in Apartments

2017 ◽  
Vol 873 ◽  
pp. 237-242
Author(s):  
Hye Kyung Shin ◽  
Kyoung Woo Kim ◽  
A Yeong Jeong ◽  
Kwan Seop Yang
Keyword(s):  
Reinforced Concrete ◽  
Wall Thickness ◽  
Field Measurements ◽  
Reinforce Concrete ◽  
Sound Insulation ◽  
Concrete Wall ◽  
Minimum Thickness ◽  
Concrete Walls ◽  
Reinforced Concrete Wall ◽  
Insulation Performance

Sound insulation between households is properly ensured to provide a quiet residential environment in apartments. The legal requirements for sound insulation in apartments in Korea are set to meet the wall’s minimum thickness or sound insulation performance. When construction companies choose the walls that satisfy thethickness in the standards of boundary walls between households, it is difficult to know the sound insulation performance. In this study, the sound insulation performance of reinforced concrete walls is predicted according to the wall thickness criteria and analyzed through field measurements. In newly built apartments, the reinforced concrete wall’s sound insulation performance(R'w) is 56 – 66 dB, which is a similar level of the international criterion. And the sound insulation performance of the reinforced concrete wall according to thickness standards is similar to sound insulation performance standardsof Korea.

Methods of field measurements of facade sound insulation

2015 ◽  
Vol 63 (5) ◽  
pp. 467-477 ◽  
Author(s):  
Sigmund Olafsen ◽  
Delphine Bard ◽  
Maria Kristin Strand ◽  
Teresa Fernandez Espejo
Keyword(s):  
Field Measurements ◽  
Sound Insulation

Field Measurements of Sound Insulation in Large, Open Rooms

2014 ◽  
Vol 21 (3) ◽  
pp. 235-250 ◽  
Author(s):  
G. Zambon ◽  
F. Angelini ◽  
A. Belingheri ◽  
R. Benocci
Keyword(s):  
Field Measurements ◽  
Sound Insulation

scholarly journals The Analysis of Low Noise Protection Barriers Influence on Tram Traffic Noise Levels

2013 ◽  
Vol 2 (1) ◽  
pp. 1-9
Author(s):  
Maja Ahac ◽  
Stjepan Lakušić ◽  
Saša Ahac ◽  
Vesna Dragčević
Keyword(s):  
Traffic Noise ◽  
Prediction Method ◽  
Field Measurements ◽  
Low Noise ◽  
Capital City ◽  
Noise Prediction ◽  
Residential Areas ◽  
Noise Mitigation ◽  
Protection Measure ◽  
Noise Models

Abstract The paper describes the analysis of tram traffic noise situation in residential areas in the vicinity of Drzic Avenue, one of the major routes between the northern and southern part of the Croatian capital city Zagreb, and the effect of low barriers placed by the tracks on tram noise mitigation. In order to evaluate the effect of planned protection measure, noise models were produced and verified with short-term field measurements. Calculations were conducted by means of noise prediction software, using European interim noise prediction method and 3D model of analyzed area. Finally, the results of noise calculations for existing tram traffic situation and planned measure of protection are presented on noise maps.

Phononic crystal sandwich for broadband and low frequency acoustic insulation under diffuse field

2021 ◽  
Vol 263 (4) ◽  
pp. 2296-2303
Author(s):  
Natacha Aberkane-Gauthier ◽  
Miguel Moleròn ◽  
Damien Lecoq ◽  
Clément Lagarrigue ◽  
Charles Pézerat ◽  
...  
Keyword(s):  
Transmission Loss ◽  
Phononic Crystal ◽  
Low Frequency ◽  
Core Layer ◽  
Field Measurements ◽  
Wide Frequency Range ◽  
Point Of View ◽  
Sound Insulation ◽  
Acoustic Insulation ◽  
Gap Opening

Light and thin structures exhibiting high sound insulation over a wide frequency range are a major industrial concern, especially in the transport and building sectors. Phononic crystals constitute promising solutions to solve this issue due to their particular dispersion properties. In this work, we build a system consisting of a well-known sandwich panel comprising a soft elastic core layer hosting periodically arranged rigid inclusions. Diffuse field measurements show a huge improvement of the Transmission Loss compared to the system without inclusions. In fact, for this kind of panel, the structured core enables Bragg band-gap opening for guided slow propagating waves leading to low frequency and broadband enhancement of the Transmission Loss. Using a 3cm-thick material we are able to improve the response from 300 Hz on (λ/38 in air). We then develop a finite elements model to achieve a precise description and understanding of the problem. We also propose a numerical tool to analyze the system's band-structures from a vibroacoustic point of view. It proves very useful for the further development of practical solutions.

Interlaboratory and proficiency tests for buildings sound insulation field measurements in Brazil - 4th Edition 2020

2021 ◽  
Vol 263 (2) ◽  
pp. 4743-4754
Author(s):  
Priscila da Silva Wunderlich ◽  
Carolina Monteiro ◽  
Juan de Frias Pierrard
Keyword(s):  
Acoustic Field ◽  
Field Tests ◽  
Field Measurements ◽  
Test Methods ◽  
Sound Level ◽  
Sound Insulation ◽  
Proficiency Tests ◽  
Interlaboratory Test ◽  
Quality Control Tool

Since 2013 ABNT NBR 15575:2013 entered into force in Brazil, a national technical standard that establishes acoustic requirements for dwellings, that can be verified by means of field measurements procedures performed according to specific ISO standards. Therefore, those requirements have fostered the acoustic field measurement market, and the number of laboratories has quickly increased across the county. ProAcústica - Brazilian Association for Acoustical Quality, a non-profit entity, aiming to improve the quality of the acoustics business in Brazil has organized in 2020 the fourth edition of the "Interlaboratory program of field measurements for building acoustics laboratories - INTERLAB Program". This consists of a fundamental tool for acoustic field laboratories to evaluate and verify the quality of their measurement results. This paper presents the methodologies and procedures used in the interlaboratory program, as well as the results of both the interlaboratory test and the proficiency carried out in São Paulo (Brazil) during 2017 by ProAcústica - Brazilian Association for Acoustical Quality. In this edition a total number of 25 laboratories have participated (32% more participants than the last edition in 2017) for different type of field tests: airborne sound insulation, airborne facade sound insulation, impact sound level, sound pressure level from service equipment in buildings, and reverberation time). The main objectives are the evaluation of the precision of the field test methods in the Brazilian market, and the analysis of the performance of the participating laboratories as a quality control tool.

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