Mapping Heavy Vehicle Noise Source Heights for Highway Noise Analysis

2017 ◽  
Author(s):  
Paul R. Donavan and Carrie J. Janello ◽  
◽  
◽  
Keyword(s):  
Noise Source ◽  
Noise Analysis ◽  
Heavy Vehicle ◽  
Vehicle Noise ◽  
Highway Noise

Mapping Heavy Vehicle Noise Source Heights for Highway Noise

2018 ◽  
Vol 2672 (24) ◽  
pp. 134-143 ◽  
Author(s):  
Carrie Janello ◽  
Paul R. Donavan
Keyword(s):  
North Carolina ◽  
Noise Source ◽  
Operating Conditions ◽  
Heavy Vehicle ◽  
Secondary Source ◽  
Noise Sources ◽  
Vehicle Noise ◽  
Heavy Trucks ◽  
Heavy Truck ◽  
Pavement Noise

The NCHRP Project 25-45 was initiated in 2013 to measure noise sources during heavy truck pass-bys using the acoustic beamforming method. Phase I testing included measurements from four relatively flat sites in Northern California, where heavy trucks traveled under moderate vehicle speeds. Sixteen additional sites in North Carolina were tested as part of Phase II. These sites had varying pavement grades, faster/slower posted speed limits, and varying operating conditions. The source mapping results from both phases were used to develop noise versus height profiles. The profiles were not significantly dependent on site and operating conditions. Average profiles were developed for each site to demonstrate that the predominant noise source was tire/pavement noise, with engine/powertrain being the secondary source; elevated sources occurred rarely and were equal to or greater than tire/pavement for only 0.5% of the total 1,289 trucks measured, while only 1.8% were within 5 dB(A) of the pavement source and 4.7% were within 10 dB(A).

Method for Measuring Vehicle Noise Source Heights and Subsource Spectra

1996 ◽  
Vol 1559 (1) ◽  
pp. 8-13
Author(s):  
Robert Coulson
Keyword(s):  
Noise Source ◽  
Traffic Noise ◽  
Regression Equations ◽  
Department Of Transportation ◽  
Vehicle Noise ◽  
Level Data ◽  
Analysis System ◽  
Transportation Agencies ◽  
Rapid Data Acquisition ◽  
Subsequent Incorporation

The U.S. Department of Transportation in cooperation with FHWA and several state transportation agencies is collecting a highway noise database for the development of noise-level regression equations. These data and equations will provide the foundation for the new traffic noise software, TNS. In addition to collecting reference energy mean emission level data, this test plan also requires an extensive database of source heights and subsource spectra covering all vehicle classes and possible roadway parameters. A description is provided of a turnkey rapid data acquisition and analysis system that was developed to collect a large database of vehicle noise source heights and subsource spectra for subsequent incorporation into TNS. Included is a summary of the analysis algorithm used to calculate the source heights, a description of the data collection system, and a brief summary of the data collected to date.

Development of a Fast Procedure for Vehicle Noise Source Quantification

2007 ◽  
Author(s):  
Dries Berckmans ◽  
Paul Sas ◽  
Wim Desmet
Keyword(s):  
Noise Source ◽  
Vehicle Noise ◽  
Fast Procedure

GIS-Based Model for Highway Noise Analysis

2009 ◽  
Vol 15 (2) ◽  
pp. 88-94 ◽  
Author(s):  
Manoj K. Jha ◽  
Min Wook Kang
Keyword(s):  
Noise Analysis ◽  
Highway Noise

Localization of a Noise Source in VVER-1000 Reactor Core Using Neutron Noise Analysis Methods

2010 ◽  
Author(s):  
Hessam Malmir ◽  
Naser Vosoughi ◽  
Ehsan Zahedinejad
Keyword(s):  
Transfer Function ◽  
Noise Source ◽  
Noise Analysis ◽  
Reactor Core ◽  
Dynamic State ◽  
Inversion Method ◽  
Variable Strength ◽  
Neutron Noise ◽  
Spatial Discretisation ◽  
Reactor Transfer

In this paper, localization of a noise source from limited neutron detectors sparsely distributed throughout the core of a typical VVER-1000 reactor is investigated. For this purpose, developing a 2-D neutron noise simulator for hexagonal geometries based on the 2-group diffusion approximation, the reactor dynamic transfer function is calculated. The box-scheme finite difference method is first developed for hexagonal geometries, to be used for spatial discretisation of both 2-D 2-group static and noise diffusion equations. The dynamic state is assumed in the frequency domain which leads to discarding of the time disrcetisation. The developed 2-D 2-group neutron noise simulator calculates both the discretised forward and the adjoint reactor transfer function between a point-like source and its induced neutron noise, by assuming the noise source as an absorber of variable strength type. Benchmarking of the mentioned neutron noise simulator revealed that it works satisfactorily. Finally, by using the inversion method of reconstruction, the location and values of a noise source of the type absorber of variable strength (or reactor oscillator) in VVER-1000 reactor cores are determined. Accuracy of this method is highly acceptable.

scholarly journals Assessment of acoustic pollution of areas bordering highways

2021 ◽  
Vol 937 (2) ◽  
pp. 022055
Author(s):  
E V Antonenko ◽  
A Yu Melnichuk ◽  
V V Popovich
Keyword(s):  
Traffic Flow ◽  
Noise Level ◽  
Motor Vehicle ◽  
Noise Source ◽  
Research Result ◽  
Maximum Level ◽  
Vehicle Noise ◽  
Acoustic Load ◽  
The Republic

Abstract The work is devoted to the peculiarities of acoustic pollution of roadside territories. The studied territory is characterized by uneven acoustic load on the experimental sections of the highways of the Republic of Crimea, which is associated with the peculiarities of traffic flow and technical characteristics of cars. The article considers the indicators of the equivalent and maximum levels of motor vehicle noise. As the research result, the excess of noise level from 10 to 30 dBA was revealed. The maximum level of acoustic pollution was recorded in 10-meter zone, at a distance of 30 m from the noise source the level of acoustic pollution is reduced to 5-10 dBA.

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