Development of a long range acoustic hail and warning device for maritime applications

Timothy A. Brungart, Andrew R. Barnard, Timothy E. McDevitt, David Marion Jenkins, Jr., Brian L. Kline, Nicholas C. Nicholas

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

An Acoustic Hail and Warning Device (AHWD), intended to project intelligible voice warning messages to listeners at 500 yards (457 m) where at least 80% of the words in an unknown message are intelligible, was designed, fabricated and tested. Design was facilitated by a methodology developed to help ensure long range intelligibility in different listener environments. Two intelligibility goals, i.e. listener environments, were evaluated: I) an outdoor listener at a distance of 457 m over water and in the presence of 89 dBA background noise levels, and II) a listener inside a closed watercraft enclosure at 457 m and in the presence of 63 dBA background levels. The 457 m distance corresponds to the radius of the protection zone surrounding U.S. Naval vessels and the background noise levels are representative of those encountered in maritime scenarios. Component testing and analyses indicated that a uniformly phased horizontal line array of 8 horn-loaded compression drivers would satisfy both goals I and II. The array was then fabricated and its voice warning message spectrum was measured. The measured spectrum and subsequent prediction showed that the 8 horn/driver array satisfies both goals I and II with 89% and 94% of the words in an unknown voice warning message being intelligible in those respective scenarios assuming homogeneous, quiescent atmospheric conditions.

Original languageEnglish (US)
Pages (from-to)1-9
Number of pages9
JournalNoise Control Engineering Journal
Volume57
Issue number1
DOIs
StatePublished - Jan 1 2009

Fingerprint

hail
warning systems
Precipitation (meteorology)
messages
Acoustics
warning
Horns
Equipment and Supplies
intelligibility
acoustics
Noise
background noise
Naval vessels
Enclosures
meteorology
enclosure
vessels
Water
Testing
methodology

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Automotive Engineering
  • Aerospace Engineering
  • Acoustics and Ultrasonics
  • Mechanical Engineering
  • Public Health, Environmental and Occupational Health
  • Industrial and Manufacturing Engineering

Cite this

Brungart, Timothy A. ; Barnard, Andrew R. ; McDevitt, Timothy E. ; Jenkins, Jr., David Marion ; Kline, Brian L. ; Nicholas, Nicholas C. / Development of a long range acoustic hail and warning device for maritime applications. In: Noise Control Engineering Journal. 2009 ; Vol. 57, No. 1. pp. 1-9.
@article{8eabecbb56854ac69c36072df687d679,
title = "Development of a long range acoustic hail and warning device for maritime applications",
abstract = "An Acoustic Hail and Warning Device (AHWD), intended to project intelligible voice warning messages to listeners at 500 yards (457 m) where at least 80{\%} of the words in an unknown message are intelligible, was designed, fabricated and tested. Design was facilitated by a methodology developed to help ensure long range intelligibility in different listener environments. Two intelligibility goals, i.e. listener environments, were evaluated: I) an outdoor listener at a distance of 457 m over water and in the presence of 89 dBA background noise levels, and II) a listener inside a closed watercraft enclosure at 457 m and in the presence of 63 dBA background levels. The 457 m distance corresponds to the radius of the protection zone surrounding U.S. Naval vessels and the background noise levels are representative of those encountered in maritime scenarios. Component testing and analyses indicated that a uniformly phased horizontal line array of 8 horn-loaded compression drivers would satisfy both goals I and II. The array was then fabricated and its voice warning message spectrum was measured. The measured spectrum and subsequent prediction showed that the 8 horn/driver array satisfies both goals I and II with 89{\%} and 94{\%} of the words in an unknown voice warning message being intelligible in those respective scenarios assuming homogeneous, quiescent atmospheric conditions.",
author = "Brungart, {Timothy A.} and Barnard, {Andrew R.} and McDevitt, {Timothy E.} and {Jenkins, Jr.}, {David Marion} and Kline, {Brian L.} and Nicholas, {Nicholas C.}",
year = "2009",
month = "1",
day = "1",
doi = "10.3397/1.3021147",
language = "English (US)",
volume = "57",
pages = "1--9",
journal = "Noise Control Engineering Journal",
issn = "0736-2501",
publisher = "Institute of Noise Control Engineering",
number = "1",

}

Development of a long range acoustic hail and warning device for maritime applications. / Brungart, Timothy A.; Barnard, Andrew R.; McDevitt, Timothy E.; Jenkins, Jr., David Marion; Kline, Brian L.; Nicholas, Nicholas C.

In: Noise Control Engineering Journal, Vol. 57, No. 1, 01.01.2009, p. 1-9.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Development of a long range acoustic hail and warning device for maritime applications

AU - Brungart, Timothy A.

AU - Barnard, Andrew R.

AU - McDevitt, Timothy E.

AU - Jenkins, Jr., David Marion

AU - Kline, Brian L.

AU - Nicholas, Nicholas C.

PY - 2009/1/1

Y1 - 2009/1/1

N2 - An Acoustic Hail and Warning Device (AHWD), intended to project intelligible voice warning messages to listeners at 500 yards (457 m) where at least 80% of the words in an unknown message are intelligible, was designed, fabricated and tested. Design was facilitated by a methodology developed to help ensure long range intelligibility in different listener environments. Two intelligibility goals, i.e. listener environments, were evaluated: I) an outdoor listener at a distance of 457 m over water and in the presence of 89 dBA background noise levels, and II) a listener inside a closed watercraft enclosure at 457 m and in the presence of 63 dBA background levels. The 457 m distance corresponds to the radius of the protection zone surrounding U.S. Naval vessels and the background noise levels are representative of those encountered in maritime scenarios. Component testing and analyses indicated that a uniformly phased horizontal line array of 8 horn-loaded compression drivers would satisfy both goals I and II. The array was then fabricated and its voice warning message spectrum was measured. The measured spectrum and subsequent prediction showed that the 8 horn/driver array satisfies both goals I and II with 89% and 94% of the words in an unknown voice warning message being intelligible in those respective scenarios assuming homogeneous, quiescent atmospheric conditions.

AB - An Acoustic Hail and Warning Device (AHWD), intended to project intelligible voice warning messages to listeners at 500 yards (457 m) where at least 80% of the words in an unknown message are intelligible, was designed, fabricated and tested. Design was facilitated by a methodology developed to help ensure long range intelligibility in different listener environments. Two intelligibility goals, i.e. listener environments, were evaluated: I) an outdoor listener at a distance of 457 m over water and in the presence of 89 dBA background noise levels, and II) a listener inside a closed watercraft enclosure at 457 m and in the presence of 63 dBA background levels. The 457 m distance corresponds to the radius of the protection zone surrounding U.S. Naval vessels and the background noise levels are representative of those encountered in maritime scenarios. Component testing and analyses indicated that a uniformly phased horizontal line array of 8 horn-loaded compression drivers would satisfy both goals I and II. The array was then fabricated and its voice warning message spectrum was measured. The measured spectrum and subsequent prediction showed that the 8 horn/driver array satisfies both goals I and II with 89% and 94% of the words in an unknown voice warning message being intelligible in those respective scenarios assuming homogeneous, quiescent atmospheric conditions.

UR - http://www.scopus.com/inward/record.url?scp=77249142023&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77249142023&partnerID=8YFLogxK

U2 - 10.3397/1.3021147

DO - 10.3397/1.3021147

M3 - Article

AN - SCOPUS:77249142023

VL - 57

SP - 1

EP - 9

JO - Noise Control Engineering Journal

JF - Noise Control Engineering Journal

SN - 0736-2501

IS - 1

ER -