Sound propagation of reverse alarms used on heavy vehicles

Authors

  • C. Laroche Sonometric Inc., Montreal, Que., Canada
  • M.-J. Ross Sonometric Inc., Montreal, Que., Canada
  • L. Lefebvre Sonometric Inc., Montreal, Que., Canada
  • R. Laraocque Sonometric Inc., Montreal, Que., Canada
  • R. Hetu
  • A. L'Esperance

Keywords:

acoustic applications, acoustic wave propagation, aeroacoustics, alarm systems, safety, reverse alarms, heavy vehicles, acoustical characteristics, sound pressure level, 700 to 2800 Hz

Abstract

In Quebec, the regulation related to the use of reverse alarms on heavy vehicles referred to the SAE J994 Standard. Regarding acoustical characteristics, this standard states that the predominant sound frequency of the alarm should fall within the frequency range of 700-2800 Hz. The cycles of sound pulsations from the alarm shall be of the order of 1-2/sec. The duration of the `on' and `off' intervals shall be approximately equal in length. The alarm should be tested in free field, 4 feet above a horizontal reflecting plane or laboratory equivalent, with the microphone 4 feet from the alarm's horn along its 0 degree axis. The alarm in then classified according to its sound pressure level: Type A: 112 dBA, Type B: 107 dBA, Type C: 97 dBA, Type D: 87 dBA and Type E: 77 dBA. The accidents reported above raise the question as to what extent such a standard insures that every worker will perceive the alarm at any position behind the heavy vehicle

Downloads

Published

1993-09-01

How to Cite

1.
Laroche C, Ross M-J, Lefebvre L, Laraocque R, Hetu R, L’Esperance A. Sound propagation of reverse alarms used on heavy vehicles. Canadian Acoustics [Internet]. 1993 Sep. 1 [cited 2023 May 29];21(3):29-30. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/759

Issue

Vol. 21 No. 3 (1993)

Section

Proceedings of the Acoustics Week in Canada

License

Copyright on articles is held by the author(s). The corresponding author has the right to grant on behalf of all authors and does grant on behalf of all authors, a worldwide exclusive licence (or non-exclusive license for government employees) to the Publishers and its licensees in perpetuity, in all forms, formats and media (whether known now or created in the future)
i)    to publish, reproduce, distribute, display and store the Contribution;
ii)    to translate the Contribution into other languages, create adaptations, reprints, include within collections and create summaries, extracts and/or, abstracts of the Contribution;
iii)    to exploit all subsidiary rights in the Contribution,
iv)    to provide the inclusion of electronic links from the Contribution to third party material where-ever it may be located;
v)    to licence any third party to do any or all of the above.

Most read articles by the same author(s)

1 2 3 4 > >>