Accession Number : AD0767033

Title :   The Establishment of Noise Criteria for Recreational Boats.

Descriptive Note : Final rept. 1 Jun 72-31 Jan 73,

Corporate Author : CATHOLIC UNIV OF AMERICA WASHINGTON D C DEPT OF CIVIL AND MECHANICAL ENGINEERING

Personal Author(s) : Magrab,Edward B.

Report Date : 20 JUL 1973

Pagination or Media Count : 87

Abstract : The noise emitted by recreational boats presents the following problems: noise pollution to by-standers, communication difficulties on-board, and permanent damage to an individuals hearing. A noise criteria must be determined first in order to solve these problems. A noise analysis of various common recreational boats and engines was conducted from measurements taken in the field. Standard test procedures for taking sound measurements exterior to and on-board recreational boats were established. The mean value of noise from large, small, and all motors were found to be 85.4, 80.2, and 82.9 dBA respectively. A noise level of 65 dBA is considered moderately noisy by most people. Therefore, most all motors emit an unacceptable level of noise to people in boating areas such as lakes, rivers, etc. The problem of communication among individuals on-board recreational boats may present a safety hazard and fog situation where warnings of danger must be spoken or ships' whistles and fog signals must be heard. A high noise level such as 82.9 of dBA over a long period of exposure may also be damaging to an individuals hearing. Standard test procedures have been established to measure the noise level emitted from recreational boats as a first step to help eliminate the above problems. (Author) Portions of this document are not fully legible.

Descriptors :   (*BOATS, *INTERNAL COMBUSTION ENGINE NOISE), MARINE ENGINES, SOUND TRANSMISSION, SOUND, SOUND PITCH, HAZARDS, TEST METHODS

Subject Categories : Marine Engineering
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE