List Of Personal Hearing Protectors And Attenuation Data
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List Of Personal Hearing Protectors And Attenuation Data
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Author : Patricia Kroes
language : en
Publisher:
Release Date : 1975
List Of Personal Hearing Protectors And Attenuation Data written by Patricia Kroes and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Deafness categories.
List Of Personal Hearing Protectors And Attenuation Data
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Author : Patricia Kroes
language : en
Publisher:
Release Date : 1975
List Of Personal Hearing Protectors And Attenuation Data written by Patricia Kroes and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Hearing categories.
Ernist Of Personal Hearing Protectors And Attenuation Data
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Author : P. Kroes
language : en
Publisher:
Release Date : 1975
Ernist Of Personal Hearing Protectors And Attenuation Data written by P. Kroes and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with categories.
A Comparative Study Of Two Methods For Measuring Attenuation Values Of Personal Hearing Protection Devices
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Author : Larry G. Martin
language : en
Publisher:
Release Date : 1989
A Comparative Study Of Two Methods For Measuring Attenuation Values Of Personal Hearing Protection Devices written by Larry G. Martin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Deafness, Noise induced categories.
Noise induced hearing loss is a subject of growing concern. Over the past 15 years, several well-documented studies have been completed which express the relationships between industrial noise exposure and damage to normal and pathological ears. This research has provided knowledge of considerable importance to developing successful hearing conservation programs. Many studies have presented the necessity of proper use of personal hearing protection devices. However, the accuracy of procedures for testing hearing protection devices remains questionable. The purpose of this study was to document a need for increased research on hearing conservation and offer additional information which may help in developing more accurate testing procedures for personal hearing protection devices. The question investigated in this study was: Can the attenuation factors of personal hearing protection devices be measured with probe-ear microphone measurement instruments, with the same accuracy as the present accepted method ANSI standard (ANSI S3.19-1974)? The test procedure used three insert type personal hearing protection devices on 15 human subjects (30 ears), ages 18-41. Each subject was tested with both the subjective test method and the objective test method for each of the three types of hearing protection used. Data collected for each test method was then compared with group mean, as well as the manufacturer's published specifications, to compare accuracy between test methods. This study determined that the present ANSI S3-1974, subjective test method, provided results which were closer to the manufacturer's published attenuation factors than that data which was recorded using the objective probe-ear microphone instrument. It was noted, even though the mean attenuation factors for the objective test method, that were considerably lower than that of the subjective method, that the overall consistency of data appeared to be more accurate using the objective method. It is recommended that further studies be conducted to provide a better procedure for using the probe-ear microphone evaluation for measuring the attenuation factors of personal hearing protection devices.
Comparison Of Personal Attenuation Ratings Attained By Agricultural And Industrial Workers For Four Hearing Protection Types Using The 3m E A Rfit Dual Validation System
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Author : Christie De Vito
language : en
Publisher:
Release Date : 2017
Comparison Of Personal Attenuation Ratings Attained By Agricultural And Industrial Workers For Four Hearing Protection Types Using The 3m E A Rfit Dual Validation System written by Christie De Vito and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Hearing categories.
Despite the enactment of hearing protection laws and recommended standards over the last four decades, the prevalence of hearing loss among workers has remained unchanged. Limiting the amount of time spend in high noise areas, as well as wearing hearing protection devices, can reduce the effects of noise on hearing loss. Though research has examined the consistency of use of hearing protection devices (HPD) among workers, the importance of fit, and a real-world comparison to the marketed attenuation needed further examination. The goal of this project is to evaluate the effectiveness of HPDs used by agricultural and industrial workers enrolled in a hearing conservation program by comparing personal attenuation rating (PAR) to the manufacturer's reported noise reduction rating (NRR). The two study groups were selected since workplaces are required to train workers enrolled in an OSHA Hearing Conservation Program on proper insertion techniques, but farmers do not typically receive any training on using hearing protection unless they are employed elsewhere. The effectiveness of the inserted HPDs were quantified via the 3M E-A-RfitTM Dual Ear Validation System, and the results were compared to the NRR provided by the manufacturer. The fit of hearing protection was evaluated for 60 farmers (247 plug pairs) and 76 workers (275 plug pairs), using four models of earplugs (two formable and two non-formable). The results show that although formable ear plugs have higher reported NRRs, a higher percentage of participants achieved PARs greater than or equal to the A-weighted adjusted NRR-7 for the non-formable plugs.
Hearing Protectors
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Author : Brian G. Smith
language : en
Publisher:
Release Date : 1997
Hearing Protectors written by Brian G. Smith and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Deafness, Noise induced categories.
"Conventional hearing protection devices represent a mature technology that has been widely used since the late 1950's. When worn consistently and correctly such devices can provide suitable hearing protection in many, if not most, noise hazardous or aurally annoying situations. In an effort to simplify the task of estimating the protection offered by a hearing protector a number of attenuation rating systems have been developed. Such methods use either a single number rating system or, a more intricate method if the noise spectra is known. This paper evaluates current literature pertaining to hearing protector attenuation calculation methods prescribed by various authorities in the industrialised world. It examines the performance estimates of given hearing protector rating systems and their ease of application in a given noise or industrial environment. Such methods rely on product data derived from laboratory measured attenuation figures to predict real world performance. However, laboratory data is viewed by some as overly optimistic compared with real world conditions. Clearly, such a demonstrated disparity may affect the accuracy of the predictive attenuation method. The single number rating systems, developed for simplicity, were found to lack the required attenuation prediction accuracy of the octave spectrum in noise environments. This has led to the development of more complex rating systems which appear to be a more acceptable approximation for the Octave Band method. However, in seeking a more accurate estimate of the noise spectra, greater error during utilisation (calculation process) offset any distinct accuracy advantages. This aspect may result in incorrect determination of the noise protection factor, offered by a hearing protector. Hence, one system could not be confidently presented as significantly superior to others investigated. Therefore, whatever is provided will be a compromise and to claim that one system is superior to another can be misleading. " -- Abstract.
Effect Of Electronic Hearing Protectors On Speech Intelligibility
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Author : John Durkin
language : en
Publisher:
Release Date : 1979
Effect Of Electronic Hearing Protectors On Speech Intelligibility written by John Durkin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Government publications categories.
Attenuation Of Passive Hearing Protection Devices As A Function Of Group Versus Individual Training
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Author : Antony R. Joseph
language : en
Publisher:
Release Date : 2004
Attenuation Of Passive Hearing Protection Devices As A Function Of Group Versus Individual Training written by Antony R. Joseph and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
Assessment And Standardization Of Personal Hearing Protection Including Active Noise Reduction
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Author :
language : en
Publisher:
Release Date : 2005
Assessment And Standardization Of Personal Hearing Protection Including Active Noise Reduction written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
Personal Hearing Protection Including Active Noise Reduction Les Dispositifs De Protection De L Ouie Y Compris L Attenuation Du Bruit Actif Cd Rom
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Author :
language : en
Publisher:
Release Date : 2005
Personal Hearing Protection Including Active Noise Reduction Les Dispositifs De Protection De L Ouie Y Compris L Attenuation Du Bruit Actif Cd Rom written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
ELECTRONIC FILE CHARACTERISTICS: 43 files; Adobe Acrobat (.PDF) and HTML. PHYSICAL DESCRIPTION: 1 CD-ROM; 4 3/4 in.; 212 MB. SYSTEMS DETAIL NOTE: Adobe Acrobat Reader is included on disc. ABSTRACT: Personal hearing protection and speech communication facilities are essential for optimal performance in military operations. High noise levels increase the risk of noise induced hearing loss and deterioration of communications. These proceedings from a lecture series on hearing protection and speech communication discuss the state-of-the-art of these topics. This includes: 1) The physiological effects in the ear due to a high noise exposure and criteria for an adequate protection. 2) The construction and performance of passive hearing protectors (isolation of noise). 3) Active hearing protectors (electronic generation of anti noise). 4) Optimal design or selection of systems by various assessment methods. 5) Realistic examples of military applications The lecture series were held in Poland, Belgium, and the USA.