Railroad Retarder Noise Reduction: Study of Acoustical Barrier Configurations

Morgan, J A; Ingard, U; Burlington Northern Inc.; Industrial Acoustics Company, Incorporated; Transportation Systems Center; John A. Volpe National Transportation Systems Center (U.S.)

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Railroad Retarder Noise Reduction: Study of Acoustical Barrier Configurations

1979-05-01
By Morgan, J A ; Ingard, U

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English

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Creators:

Morgan, J A ; Ingard, U

Morgan, J A ; Ingard, U Less -
Corporate Creators:

Burlington Northern Inc. ; Industrial Acoustics Company, Incorporated ; Transportation Systems Center ; John A. Volpe National Transportation Systems Center (U.S.)

Burlington Northern Inc. ; Industrial Acoustics Company, Incorporated ; Transportation Systems Center ; John A. Volpe National Transportation Systems Center (U.S.) Less -
Subject/TRT Terms:

[+]

Acoustic Insulation Acoustic Measurement Acoustic Measuring Instruments Acoustics Barriers Barriers (Roads) Burlington Northern, Incorporated Damping (Engineering) Field Tests Freight Cars Freight Terminals Hump Yards Noise Noise Abatement Noise Barriers Noise Control Noise Level Noise Pollution Noise Reduction Railroad Trains Retarder Control Retarder Noise Sound Level
Publication/ Report Number:

DOT-TSC-NHTSA-79-35 ; HS-804 354

DOT-TSC-NHTSA-79-35 ; HS-804 354 Less -
Resource Type:

Research Paper
Geographical Coverage:

United States ; Minnesota

United States ; Minnesota Less -
Edition:

Final report; June 1975-February 1977
Corporate Publisher:

United States. Department of Transportation. National Highway Traffic Safety Administration
Abstract:

Field measurements of noise were made near a railroad retarder system without barriers and with acoustical barriers of various configurations. The configurations tested included acoustically reflective and acoustically absorptive barriers with heights of 4 to 12 feet and lengths extending from 0 to 22 feet beyond retarder entrance and exit. Two of the 12 foot high barriers were also tested with a 1 foot inward projecting acoustical panel lip along the top. It was found that the absorptive barriers reduced retarder noise from a few decibels inside the barriers to as much as 25 decibels at 100 feet from the retarder on the system centerline perpendicular to the tracks. Reflective barriers increased noise inside the barriers and at points outside, but near open ends of, the barriers; and reflective barrier noise reduction at 100 feet on the perpendicular centerline was limited to about 16 decibels. Retarder noise was concentrated in a frequency range between 2 and 3 kilohertz. The analytical study presented provides details on the role of observer location as well as the various aspects of barrier configuration.
Format:

PDF
Funding:

DOT-TSC-1035
Collection(s):

Volpe Center
Main Document Checksum:

[+]

urn:sha256:7d3c8fc47888876d0b43c8c0ec5e620a3a4be4571f580648e78e16e5f623c92a
Download URL:

https://rosap.ntl.bts.gov/view/dot/8971/dot_8971_DS1.pdf
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Railroad Retarder Noise Reduction: Study of Acoustical Barrier Configurations

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