A Method for Evaluating Noise Reduction Effect of Low-noise Asphalt Pavements Based on Damping Characteristics

2021 ◽

Vol 263 (4) ◽

pp. 2930-2939

Author(s):

Byungchae Kim ◽

Hyunjin Kim ◽

Wonuk Kang

Keyword(s):

Noise Reduction ◽

Noise Level ◽

Measurement Method ◽

Road Traffic ◽

Low Noise ◽

Management Standards ◽

Close Proximity ◽

Porous Pavement ◽

Reduction Effect ◽

Measurement Location

In Korea, road noise is assessed as a measurement method of exterior noise emitted by road vehicle for management standards by the National Institute of Environmental Sciences. In this method, the noise felt at the actual pickup point is measured as LAeq (the roadside equivalent noise level). Recently, to clarify the standard for measuring noise on low-noise pavements, the CPX (ISO11819-2; Close-proximity method) was first introduced in the Porous Pavement Guidelines of the Ministry of Land, Infrastructure and Transport. According to ISO, the CPX adopts the side microphone as a mandatory measurement location, and the rear optional. The side location has been a mandatory due to its high correlation with SPB (ISO 11819-1, Statistical Pass-by method). However, according to our previous study on the correlation evaluation between L and CPX rear microphone noise level, both noise reduction effect was about 9-12 dB(A) showed a high correlation in Korea where heavy road traffic is common. The following study aims to show the consistent correlation between the L and CPX rear noise level. Furthermore, it is intended to be helpful in selecting the location of the CPX microphone that can most effectively represent the actual noise on the low-noise pavement in Korea.

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Optimized Asphalt Mixtures for Noise Reduction in Lithuanian Roads

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.614.618 ◽

2014 ◽

Vol 614 ◽

pp. 618-621

Author(s):

Audrius Vaitkus ◽

Tadas Andriejauskas ◽

Laura Čygaitė ◽

Jurgita Židanavičiūtė

Keyword(s):

Noise Reduction ◽

Noise Pollution ◽

Low Noise ◽

Asphalt Pavements ◽

Noise Levels ◽

Road Noise ◽

Negative Effects ◽

Development Experience ◽

Growing Economy ◽

Generation Mechanisms

In the world of growing economy and population, the need of transportation is rapidly increasing also raising problems of noise pollution. Environmental noise levels are increasing in parallel with increasing traffic flows resulting negative effects for society, wildlife and economy. The article gives an overview about the main transport noise source tyre/road noise, its generation mechanisms and influencing factors. One of the most effective and promising tyre/road noise solutions is low noise pavements, which has different noise reduction approaches. Low noise asphalt pavements and theoretical noise reduction principles are analysed in the paper as well as the development experience of particular low noise asphalt pavements for Lithuanian conditions.

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Evaluating the Tire/Pavement Noise and Surface Texture of Low-Noise Micro-Surface Using 3D Digital Image Technology

Frontiers in Materials ◽

10.3389/fmats.2021.683947 ◽

2021 ◽

Vol 8 ◽

Author(s):

Wang Chen ◽

Mulian Zheng ◽

Haiyang Wang

Keyword(s):

Noise Reduction ◽

Digital Image ◽

Surface Texture ◽

Three Dimensional ◽

Low Noise ◽

Road Noise ◽

Texture Model ◽

Promising Tool ◽

Absorbing Materials ◽

Reduction Effect

As a common preventive maintenance technique for asphalt pavement, micro-surface (MS) has the advantages of waterproofing and crack sealing. However, issues such as the fact that the conventional MS generates large noise and the evaluation of the indexes of tire-road noise are relatively less studied. The traditional surface texture index cannot reveal the range and distribution of pavement surface texture, thus hindering research of low-noise MS. To study the mechanism of tire-road noise generated by MS, and propose the tire-road noise and surface texture indicators for MS. In this study, the mechanism of five low-noise MS was systematically analyzed and compared through surface texture and noise tests. Then, a three-dimensional digital texture model (3D-DTM) of MS surface texture was constructed using a series of digital image processing techniques, including grayscale identification, binary conversion, and noise reduction. The results show that optimizing the gradation, adding sound-absorbing materials, and improving the workability of construction can improve the noise reduction performance of MS, it is worth mentioning that the MS prepared with sound-absorbing materials and low-noise gradation has the greatest noise reduction effect, with a maximum reduction of 6.3 dB(A). In addition, it was also found that the 3D-DTM can well reflect the surface texture characteristics of MS. The probability of convex peak distribution (PCD) and the proportion of convex peak area (PCA) with peak heights greater than 0.25 mm (Kh ≥ 0.25), which are extracted from the 3D-DTM, can well reflect the surface texture, tire-road noise, respectively. The results show that the 3D-DTM is a promising tool to optimize the design of low-noise MS.

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Layout Method of Damping Material for Gearbox Based on Acoustic Contribution

Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University ◽

10.1051/jnwpu/20193740757 ◽

2019 ◽

Vol 37 (4) ◽

pp. 757-766

Author(s):

Yunong Liu ◽

Lan Liu ◽

Geng Liu ◽

Liyan Wu ◽

Chao Liu ◽

...

Keyword(s):

Noise Reduction ◽

Present Method ◽

Element Model ◽

Low Noise ◽

Radiated Noise ◽

Damping Material ◽

Plate Area ◽

Acoustic Contribution ◽

Reduction Effect ◽

Damping Materials

In order to realize the low noise design of marine gearbox, a layout method of damping materials for gearbox based on acoustic contribution was proposed. The present method can accurately and effectively determine the additional area of damping materials and achieve greatly the noise reduction effect. Firstly, taking a marine single-stage herringbone gearbox as the object, the finite element/boundary element model for the reducer structure was established. After applying the vibration excitation of the gear system, the radiated noise of each field point was solved. Secondly, by analyzing the acoustic transfer vector (ATV) and modal acoustic contribution (MAC), the surface of the gearbox was partitioned, and the partitioned surface was analyzed by using panel acoustic contribution (PAC). Finally, the damping material was added to the plate area which contributes greatly to the radiated noise, and the effect of the noise reduction under different schemes were compared. The results show that the layout design of damping materials based on the present method can reduce the radiation noise of observation points accurately and effectively in the range of 0~4 000 Hz.

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Noise Reduction Effect of Multiple-Sampling-Based Signal-Readout Circuits for Ultra-Low Noise CMOS Image Sensors

Sensors ◽

10.3390/s16111867 ◽

2016 ◽

Vol 16 (11) ◽

pp. 1867 ◽

Cited By ~ 9

Author(s):

Shoji Kawahito ◽

Min-Woong Seo

Keyword(s):

Noise Reduction ◽

Low Noise ◽

Image Sensors ◽

Readout Circuits ◽

Multiple Sampling ◽

Cmos Image Sensors ◽

Reduction Effect ◽

Ultra Low Noise ◽

Signal Readout

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Reduction of Hydrodynamic Noise of 3D Hydrofoil with Spanwise Microgrooved Surfaces Inspired by Sharkskin

Journal of Marine Science and Engineering ◽

10.3390/jmse7050136 ◽

2019 ◽

Vol 7 (5) ◽

pp. 136 ◽

Cited By ~ 3

Author(s):

Zhigao Dang ◽

Zhaoyong Mao ◽

Wenlong Tian

Keyword(s):

Noise Reduction ◽

Three Dimensional ◽

Low Noise ◽

Numerical Predictions ◽

Large Eddy ◽

Flow Induced Noise ◽

Hydrodynamic Noise ◽

Reduction Effect ◽

Underwater Structures ◽

Good Agreement

Loud hydrodynamic noise is not only potentially harmful to the health of organisms in the ocean, but it is also a threat to the survival of underwater vehicles. Different from the general noise reduction technologies at present, a new idea for a flow-induced noise reduction design with spanwise microgrooved surfaces inspired by sharkskin is introduced in this paper. Large eddy simulations (LES) combined with the Ffowcs Williams and Hawkings (FW-H) equation are adopted to simulate the hydrodynamic noise of the three-dimensional (3D) hydrofoil. The accuracy of the numerical predictions is checked against existing experimental data, achieving good agreement. With the increase of observing distance, the noise reduction effect at the trailing edge direction is gradually apparent, and a maximum noise reduction of up to 7.28 dB can be observed. It is seen from the noise spectra of the biomimetic hydrofoil that the main peaks are eliminated, and the noise level at high frequency is also decreased. The cause of noise reduction lies in the secondary vortex generated in the microgrooves, which hinder the process of turbulence, consume the energy of the flow, and weaken the intensity of turbulent burst. The results of this study provide a new way to design low-noise underwater structures with hydrofoils.

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Noise Reduction Effect of Superhydrophobic Surfaces with Streamwise Strip of Channel Flow

Applied Sciences ◽

10.3390/app11093869 ◽

2021 ◽

Vol 11 (9) ◽

pp. 3869

Author(s):

Chen Niu ◽

Yongwei Liu ◽

Dejiang Shang ◽

Chao Zhang

Keyword(s):

Reynolds Number ◽

Drag Reduction ◽

Noise Reduction ◽

Channel Flow ◽

Superhydrophobic Surface ◽

Sound Field ◽

Flow Noise ◽

Slip Boundary ◽

Eddy Simulation ◽

Reduction Effect

Superhydrophobic surface is a promising technology, but the effect of superhydrophobic surface on flow noise is still unclear. Therefore, we used alternating free-slip and no-slip boundary conditions to study the flow noise of superhydrophobic channel flows with streamwise strips. The numerical calculations of the flow and the sound field have been carried out by the methods of large eddy simulation (LES) and Lighthill analogy, respectively. Under a constant pressure gradient (CPG) condition, the average Reynolds number and the friction Reynolds number are approximately set to 4200 and 180, respectively. The influence on noise of different gas fractions (GF) and strip number in a spanwise period on channel flow have been studied. Our results show that the superhydrophobic surface has noise reduction effect in some cases. Under CPG conditions, the increase in GF increases the bulk velocity and weakens the noise reduction effect. Otherwise, the increase in strip number enhances the lateral energy exchange of the superhydrophobic surface, and results in more transverse vortices and attenuates the noise reduction effect. In our results, the best noise reduction effect is obtained as 10.7 dB under the scenario of the strip number is 4 and GF is 0.5. The best drag reduction effect is 32%, and the result is obtained under the scenario of GF is 0.8 and strip number is 1. In summary, the choice of GF and the number of strips is comprehensively considered to guarantee the performance of drag reduction and noise reduction in this work.

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