Development of a durable third generation Porous Asphalt with a high noise reduction.

2016 ◽  
Author(s):  
Arian de Bondt ◽  
Kees Plug ◽  
Jan van de Water ◽  
Peter The ◽  
Jan Voskuilen
Keyword(s):  
Noise Reduction ◽  
Third Generation ◽  
High Noise ◽  
Porous Asphalt

Additional noise reduction with diffracting elements on barriers: experimental testing

2021 ◽  
Vol 263 (4) ◽  
pp. 2654-2664
Author(s):  
Wout Schwanen ◽  
Mark Mertens ◽  
Ysbrand Wijnant ◽  
Willem Jan van Vliet
Keyword(s):  
Noise Reduction ◽  
Experimental Testing ◽  
Low Noise ◽  
Motor Vehicles ◽  
Additional Element ◽  
High Noise ◽  
Quarter Wavelength ◽  
Noise Barrier ◽  
Sound Reduction ◽  
Development And Validation

The noise reduction of a (low) noise barrier can be enhanced by using an additional element with quarter-wavelength resonators with varying depths. The so-called WHISwall or WHIStop deflects sound upwards for specific frequencies creating an additional sound reduction. Different experiments on the WHISwall and WHIStop are performed as input for model validation. The development and validation of the model are described in a separate paper. In this paper the measurement campaign and its results are presented. We performed measurements on two setups. The first setup consists of a 1.1 meter high WHISwall, a 1.1m high noise barrier and a reference section (without noise measure). Measurements have been conducted with both an artificial sound source and pass by measurements with light and heavy motor vehicles. In a second test setup, the WHIStop was placed on top of a 4 meter high noise barrier and the diffraction was determined according the European standard EN 1793-4.

scholarly journals High Noise Reduction Ear Enclosures

1973 ◽  
Vol 53 (1) ◽  
pp. 315-315
Author(s):  
C. H. Allen ◽  
C. I. Malme
Keyword(s):  
Noise Reduction ◽  
High Noise

scholarly journals Noise Reduction Effect of Porous Asphalt Pavement Based on Acoustic-Structure Coupling Model

2021 ◽  
Vol 8 (2) ◽  
pp. 97-102
Author(s):  
Jiakun Yang ◽  
Zhou Qiu ◽  
Chuanfeng Zheng
Keyword(s):  
Noise Reduction ◽  
Sound Absorption ◽  
Asphalt Pavement ◽  
Traffic Noise ◽  
Coupling Model ◽  
Comsol Multiphysics ◽  
Acoustic Structure ◽  
Porous Asphalt ◽  
Reduction Effect ◽  
Pore Depth

Nowadays, the traffic noise problem is becoming increasingly prominent. In order to study the influence of porosity and pore depth on the noise reduction performance of asphalt pavement, this paper used the software COMSOL Multiphysics to establish acoustic-structure coupling models, and simulated the sound absorption and noise reduction effect of asphalt pavement under 10%, 15%, 20%, 25%, and 30% porosity; moreover, under the condition of unchanged asphalt pavement porosity, the sound absorption and noise reduction effect of asphalt pavement under 3cm, 4cm, 5cm, 6cm, and 7cm pore depth was studied as well. The research results reveal that, with the increase of porosity and pore depth, the sound absorption and noise reduction effect of asphalt pavement gets better.

A Case Study on Noise Reduction Effect of Two-layer Porous Asphalt Pavement in an Urban Area

2016 ◽  
Vol 18 (5) ◽  
pp. 49-56 ◽  
Author(s):  
Jong-Seok Jung ◽  
Jeong-Rak Sohn ◽  
Soo-Hyoung Lee ◽  
Hong-Seok Yang
Keyword(s):  
Noise Reduction ◽  
Urban Area ◽  
Asphalt Pavement ◽  
Porous Asphalt ◽  
Reduction Effect

Micro-structural analysis of noise reduction mechanism of porous asphalt mixture based on FEM

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Junfeng Sun ◽  
Haitao Zhang ◽  
Guangyuan Wu ◽  
Zuoqiang Liu ◽  
Yuping Feng ◽  
...  
Keyword(s):  
Pore Structure ◽  
Noise Reduction ◽  
Sound Absorption ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Low Noise ◽  
Reduction Mechanism ◽  
Absorption Mechanism ◽  
Content Type ◽  
Porous Asphalt

PurposeIn order to give full play to the function of noise reduction of asphalt pavement, it is necessary to understand its internal sound absorption mechanism. Therefore, the purpose of this study is to establish a micro model of the pore structure of asphalt mixture with the help of finite element method (FEM), discuss the noise reduction mechanism of asphalt pavement from the micro perspective and analyze and evaluate the noise attenuation law of the pore structure.Design/methodology/approachThe FEM was used to establish the microscopic model of the pore structure of asphalt mixture. Based on the principle of acoustics, the noise reduction characteristics of asphalt pavement were simulated. The influence of gradation and pore characteristics on the noise reduction performance of asphalt pavement was analyzed.FindingsThe results show that the open graded friction course-13 (OGFC-13) has excellent performance in noise reduction. The resonant sound absorption structure composed of its large porosity can effectively reduce the pavement noise. For asphalt concrete-13 (AC-13) and stone matrix asphalt-13 (SMA-13), the less resonant sound absorption structure makes them have poor sound absorption effect. In addition, the variation rules of noise transmission loss (TL) curve and sound absorption coefficient curve of three graded asphalt mixtures were obtained. At the same time, the peak noise reduction values of OGFC-13, AC-13 and SMA-13 were obtained, which were 650Hz, 1000Hz and 800Hz, respectively.Originality/valueThe results show that the simulation results can well reflect and express the experimental results. This will provide a reference for further exploring the sound absorption mechanism and its variation rule of porous asphalt pavement. It also has some positive significance for the application of low noise asphalt pavement.

An adaptive noise reduction stethoscope for auscultation in high noise environments

1998 ◽  
Vol 103 (5) ◽  
pp. 2483-2491 ◽  
Author(s):  
Samir B. Patel ◽  
Thomas F. Callahan ◽  
Matthew G. Callahan ◽  
James T. Jones ◽  
George P. Graber ◽  
...  
Keyword(s):  
Noise Reduction ◽  
High Noise ◽  
Adaptive Noise

scholarly journals A Case Study to Improve the Quality of Median Filter

2021 ◽  
Vol 10 (11) ◽  
pp. 19-28
Author(s):  
Ziad A. Alqadi ◽  
Mohamad Tariq Barakat
Keyword(s):  
Noise Reduction ◽  
Digital Image ◽  
Median Filter ◽  
Reduction Process ◽  
Research Paper ◽  
Quality Factors ◽  
High Noise ◽  
Negative Effect

The median filter is used to reduce the effect of noise, but it treats all pixels, whether they are noise points or not, which negatively affects many non-noise values in the digital image, and the negative effect increases as the noise ratio increases. In order to get rid of some of the disadvantages of the median filter, we will present in this research paper a detailed study that works on treating the unaffected and infected pixels so that this treatment leads to improving the performance of the filter by raising the values of the quality factors of the filter. The improvements added to the median filter will raise the efficiency of the noise reduction process, especially for high noise ratios.

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