Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

A new hearing protector attenuation measurement method.

Authors
Ellenbecker-MJ; Rimmer-TW
Source
Department of Work Environment, School of Engineering, University of Massachusetts, Lowell, Massachusetts 1995 Dec; :1-86
Link
NIOSHTIC No.
00232297
Abstract
Bone conduction loudness balance (BCLB), a new method for determining the attenuation of hearing protective devices (HPDs), was evaluated. When using BCLB for earplug testing with headphones, pure tones of equal frequency can be used for both the air conduction (AC) and bone conduction (BC) sounds with reasonable accuracy. Using BCLB with an external loudspeaker as the AC sound source makes it impossible to use pure tones of equal frequencies since the occlusion effect will cause an overestimation of attenuation at frequencies under 2000 hertz. A practical way to minimize the occlusion effect is to use a constant frequency noise band as the BC sound against which AC noise bands of varying frequency are balanced. Comparisons of mean A- weighted attenuation for broad band noise of various frequency distributions showed agreement generally within 1 decibel between BCLB and real ear attenuation at threshold (REAT), for earplugs, earmuffs, and earmuffs with earplugs. No significant interference was noted by background noise up to a level typical of industrial audiometric testing environments, 35 decibels-A. No significant differences were noted in BCLB and REAT with regard to administration time and repeatability. The BCLB was found to be accurate, reliable, and practical for determining attenuation for all common types of HPDs.
Keywords
NIOSH-Grant; Control-technology; Ear-protectors; Personal-protective-equipment; Industrial-noise; Hearing-protection; Acoustical-measurements
Contact
Work Environment University of Lowell One University Ave Lowell, MA 01854
Publication Date
19951201
Document Type
Final Grant Report
Funding Amount
26362
Funding Type
Grant
Fiscal Year
1996
NTIS Accession No.
PB97-113708
NTIS Price
A06
Identifying No.
Grant-Number-R03-OH-03249
NIOSH Division
OEP
Priority Area
Control-technology
Source Name
Department of Work Environment, School of Engineering, University of Massachusetts, Lowell, Massachusetts
State
MA
Performing Organization
University of Massachusetts Lowell, Lowell, Massachusetts
TOP