scholarly journals A theoretically-based method to estimate highway noise levels, with emphasis on parallel barrier insertion loss determination.

1984 ◽  
Vol 5 (1) ◽  
pp. 1-10
Author(s):  
Louis F. Cohn ◽  
William Bowlby
Keyword(s):  
Insertion Loss ◽  
Noise Levels ◽  
Highway Noise ◽  
Loss Determination

Ray Acoustics Approach to Quantitative Prediction of Highway Traffic Noise

2010 ◽  
Author(s):  
Liming Dai ◽  
Huay Seen Lee
Keyword(s):  
Prediction Model ◽  
Traffic Noise ◽  
Environmental Noise ◽  
Quantitative Prediction ◽  
Highway Traffic ◽  
Noise Levels ◽  
Modeling Approach ◽  
Highway Noise

A Highway Prediction Model (HPM) using the ray acoustics modeling approach is developed in this research. The HPM model can be used to quantitatively predict the environmental noise levels on highways of different pavements. Comparison between the measured noise levels using the SPB method and predicted noise levels with the model developed shows that the prediction model established is reliable for estimating highway noise in Canada.

Variability of highway noise barrier insertion loss in the atmosphere

1998 ◽  
Vol 104 (3) ◽  
pp. 1750-1750
Author(s):  
Scott D. Hansen ◽  
Courtney B. Burroughs
Keyword(s):  
Insertion Loss ◽  
Noise Barrier ◽  
Highway Noise

Effects of median barriers on highway noise levels

2013 ◽  
Vol 133 (5) ◽  
pp. 3588-3588
Author(s):  
Jonghoon Kim ◽  
Louis Cohn ◽  
Ning Shu
Keyword(s):  
Noise Levels ◽  
Highway Noise

Numerical Assessment of Optimal Equipment Allocation and Close-Fitting Acoustical Hoods Within a Multi-Noise Plant Using an Artificial Immune Method

2012 ◽  
Vol 29 (1) ◽  
pp. 185-195 ◽  
Author(s):  
M.-C. Chiu
Keyword(s):  
Shape Optimization ◽  
Insertion Loss ◽  
Research Work ◽  
Noise Levels ◽  
Artificial Immune ◽  
High Noise ◽  
Acoustic Performance ◽  
Numerical Assessment ◽  
Noise Impact ◽  
Control Work

High noise levels in a multi-noise plant can be harmful to workers and can lead to both psychological and physiological problems. Consequently, noise control work on equipment such as acoustic hoods becomes vital. However, research work of shape optimization on space-constrained close-fitting acoustic hoods has been neglected.In this paper, a sound insertion loss used for evaluating the acoustic performance of an acoustical hood will be adopted. A numerical case for depressing the noise levels at the receiving points along the boundary of three kinds of multi-equipment plants by optimally designing a shaped one-layer close-fitting acoustic hood and reallocating the equipment within a constrained space will also be introduced. Moreover, an artificial immune method (AIM) is adopted and coupled with the equations of sound attenuation and minimal variation square in conjunction with a twelve-point monitoring system.Consequently, this paper provides a quick and effective method for reducing the noise impact around a plant by optimally designing a shaped one-layer close-fitting acoustic hood and reallocating equipment within the AIM searching technique.

Implications of Rounding in Highway Noise Analyses and Policies

2017 ◽  
Vol 2628 (1) ◽  
pp. 42-46
Author(s):  
Harvey S. Knauer
Keyword(s):  
Insertion Loss ◽  
Predictive Models ◽  
Cost Benefit ◽  
Guidance Document ◽  
Measurement Equipment ◽  
Noise Levels ◽  
Noise Abatement ◽  
Related Factors ◽  
State Highway ◽  
State Highway Agencies

In performing noise analyses, noise measurement equipment and noise predictive models usually report noise levels in tenths of a decibel. Customarily, these levels are reported as whole decibel numbers in state highway agencies’ noise reports. However, there is not a consistent rounding method used by state highway agencies (SHAs) that is applied to these levels in noise level calculations, in noise abatement feasibility and reasonableness evaluations, and in the reporting of results in SHA noise study reports. The objective is not to recommend one method of rounding, but to discuss the influence that several rounding methods may have on decisions regarding the feasibility and reasonableness of noise abatement devices and to offer recommendations and suggestions for SHAs to consider when determining the number of impacted receptors, calculating a noise barrier’s insertion loss, determining the number of benefited receptors, weighting benefited receptors, addressing noise reduction design goals, and calculating cost–benefit values. Nine recommendations are presented for consideration by SHAs, and rounding-related factors are suggested for consideration by SHAs in the modification of any noise policy or guidance document.

A model for insertion loss degradation for parallel highway noise barriers

1986 ◽  
Vol 80 (3) ◽  
pp. 855-868 ◽  
Author(s):  
William Bowlby ◽  
Louis F. Cohn
Keyword(s):  
Insertion Loss ◽  
Noise Barriers ◽  
Highway Noise

Effect of traffic mix volume and speed on highway noise levels

1976 ◽  
Vol 60 (S1) ◽  
pp. S23-S23
Author(s):  
Richard J. Peppin ◽  
Basil H. Manns
Keyword(s):  
Noise Levels ◽  
Highway Noise

A review on barrier diffraction theories and related insertion loss comparisons in highway noise models

2006 ◽  
Vol 120 (5) ◽  
pp. 3337-3337
Author(s):  
Ning Shu ◽  
Louis F. Cohn ◽  
Roswell A. Harris ◽  
Teak K. Kim
Keyword(s):  
Insertion Loss ◽  
Highway Noise ◽  
Noise Models
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