scholarly journals A study of the Indoor-Impulse Noise Attenuation Effect for the Hearing Protection Devices

2014 ◽  
Vol 19 (5) ◽  
pp. 37-42
Author(s):  
Sung-Hak Chung ◽  
Kee-Hyeok Song
Keyword(s):  
Impulse Noise ◽  
Hearing Protection ◽  
Noise Attenuation ◽  
Attenuation Effect ◽  
Protection Devices

scholarly journals The effect of hearing protection devices on speech intelligibility of Persian employees

2020 ◽  
Vol 13 (1) ◽  
Author(s):  
Mina Karami ◽  
Mohsen Aliabadi ◽  
Rostam Golmohammadi ◽  
Morteza Hamidi Nahrani
Keyword(s):  
Noise Reduction ◽  
Speech Intelligibility ◽  
Work Environments ◽  
Hearing Protection ◽  
Noise Attenuation ◽  
Speech Discrimination ◽  
Significant Difference ◽  
Protection Devices ◽  
Male Subjects ◽  
Speech Interference

Abstract Objective This study aimed to investigate the effect of hearing protection devices (HPDs) on speech intelligibility in Persian work environments. Three current earmuffs and three earplugs and one of the prototypes of molded earplug were tested on 15 male subjects which were randomly selected. The noise reduction of HPDs was measured based on the Real Ear Attenuation at Threshold (REAT) method. Speech intelligibility during using HPDs was determined based on the speech discrimination score (SDS) at two signal to noise (S/N) ratios (0 and + 5). Data were analyzed using SPSS 22. Results The actual to nominal noise reduction rating values were from 47 to 84% for HPDs. At two S/N ratios, no significant differences were observed in speech intelligibility using HPDs (p > 0.05). At S/N ratio = 0, the speech intelligibility descriptively has been only improved by using common earmuffs up to 9.07%. There was a significant difference up to 21.27% in speech intelligibility for proposed molded earplugs at S/N ratio = 0 (p < 0.05). Increasing the HPDs' noise attenuation values led to an increase in speech interference (p < 0.05). The HPDs with the minimum required noise attenuation while maintaining acceptable speech intelligibility should be worn by employees exposed to medium noise levels.

scholarly journals Protection by noise in quarrying activities: test methods comparison of the hearing protection devices efficiency

2019 ◽  
Vol 128 ◽  
pp. 08005
Author(s):  
Guido Alfaro Degan ◽  
Gianluca Coltrinari ◽  
Dario Lippiello ◽  
Pietro Nataletti ◽  
Diego Annesi
Keyword(s):  
Test Methods ◽  
Hearing Protection ◽  
Noise Attenuation ◽  
Specific Procedure ◽  
Negative Effects ◽  
Relevant Role ◽  
Measurement Methodology ◽  
Protection Devices ◽  
Maximum Protection

The work operations in the quarry activities are the source of many physical agents such as dust and vibrations but especially noise. This last can have relevant negative effects they cause serious problems for the worker’s health. In order to prevent the hearing loss, the employer must provide to the workers the HPD (Hearing Protection Devices). They are inserted inside the ear following a specific procedure to ensure the maximum protection by the noise. For this reason, the use training represents an essential aspect. Also the material, which the device is made of, can influence strongly the actual noise attenuation. The study is based on tests with different HPD, some made of polyurethane and others by silicone. Two experimental campaigns were carried out under different conditions with the same measurement methodology. The results highlight the importance of the methodology used in the test and the relevant role of the use training.

Assessment of Impulse Noise Hazard and the Use of Hearing Protection Devices in Workplaces Where Forging Hammers are Used

2015 ◽  
Vol 39 (1) ◽  
pp. 73-79 ◽  
Author(s):  
Rafał Młyński ◽  
Emil Kozłowski ◽  
Jan Adamczyk
Keyword(s):  
Sound Pressure Level ◽  
Impulse Noise ◽  
Sound Pressure ◽  
Noise Exposure ◽  
Pressure Level ◽  
Hearing Protection ◽  
Exposure Level ◽  
Limit Values ◽  
Noise Parameters ◽  
Protection Devices

Abstract The impulse noise is agent harmful to health not only in the case of shots from firearms and the explosions of explosive materials. This kind of noise is also present in many workplaces in the industry. The paper presents the results of noise parameters measurements in workplaces where four different die forging hammers were used. The measured values of the C-weighted peak sound pressure level, the A-weighted maximum sound pressure level and A-weighted noise exposure level normalized to an 8 h working day (daily noise exposure level) exceeded the exposure limit values. For example, the highest measured value of the C-weighted peak sound pressure level was 148.9 dB. In this study possibility of the protection of hearing with the use of earplugs or earmuffs was assessed. The measurement method for the measurements of noise parameters under hearing protection devices using an acoustical test fixture instead of testing with the participation of subjects was used. The results of these measurements allows for assessment which of two tested earplugs and two tested earmuffs sufficiently protect hearing of workers in workplaces where forging hammers are used.

A study of the real-world noise attenuation of the current hearing protection devices in typical workplaces using Field Microphone in Real Ear method

Work ◽  
2018 ◽  
Vol 60 (2) ◽  
pp. 271-279
Author(s):  
Mohsen Aliabadi ◽  
Azam Biabani ◽  
Rostam Golmohammadi ◽  
Maryam Farhadian
Keyword(s):  
Real World ◽  
Hearing Protection ◽  
Noise Attenuation ◽  
The Real ◽  
Protection Devices

Evaluation of hearing protection devices with high-amplitude impulse noise

2011 ◽  
Vol 130 (4) ◽  
pp. 2433-2433
Author(s):  
Karl Buck ◽  
Sebastien DeMezzo ◽  
Pascal Hamery
Keyword(s):  
Impulse Noise ◽  
High Amplitude ◽  
Hearing Protection ◽  
Protection Devices

scholarly journals The effect of hearing protection devices on speech intelligibility of Persian employees

2020 ◽  
Author(s):  
Mina Karami ◽  
Mohsen Aliabadi ◽  
Rostam Golmohammadi ◽  
Morteza Hamidi Nahrani
Keyword(s):  
Noise Reduction ◽  
Speech Intelligibility ◽  
Work Environments ◽  
Hearing Protection ◽  
Noise Attenuation ◽  
Speech Discrimination ◽  
Significant Difference ◽  
Protection Devices ◽  
Male Subjects ◽  
Attenuation Values

Abstract Objective: This study aimed to investigate the effect of hearing protection devices (HPDs) on speech intelligibility in Persian work environments. Three current earmuffs and three earplugs and one of the prototypes of molded earplug were tested on 15 male subjects which were randomly selected. The noise reduction of HPDs was measured based on the Real Ear Attenuation at Threshold (REAT) method. Speech intelligibility during using HPDs was determined based on the speech discrimination score (SDS) at two signal to noise (S/N) ratios (0 and +5). Data were analyzed using SPSS 22.Results: The actual to nominal noise reduction rating values were from 47% to 84% for HPDs. At two S/N ratios, no significant differences were observed in speech intelligibility using HPDs (p >0.05). At S/N ratio=0, the speech intelligibility descriptively has been only improved by using common earmuffs up to 9.07 %. There was a significant difference up to 21.27% in speech intelligibility for proposed molded earplugs at S/N ratio=0 (p <0.05). Increase the HPDs' noise attenuation values lead to increase interference in the speech (p <0.05). The HPDs with the minimum required noise attenuation while maintaining acceptable speech intelligibility should be worn by employees exposed to medium noise levels.

scholarly journals The effect of hearing protection devices on speech intelligibility of Persian employees

2020 ◽  
Author(s):  
Mina Karami ◽  
Mohsen Aliabadi ◽  
Rostam Golmohammadi ◽  
Morteza Hamidi Nahrani
Keyword(s):  
Noise Reduction ◽  
Speech Intelligibility ◽  
Work Environments ◽  
Hearing Protection ◽  
Noise Attenuation ◽  
Speech Discrimination ◽  
Significant Difference ◽  
Protection Devices ◽  
Male Subjects ◽  
Speech Interference

Abstract Objective: This study aimed to investigate the effect of hearing protection devices (HPDs) on speech intelligibility in Persian work environments. Three current earmuffs and three earplugs and one of the prototypes of molded earplug were tested on 15 male subjects which were randomly selected. The noise reduction of HPDs was measured based on the Real Ear Attenuation at Threshold (REAT) method. Speech intelligibility during using HPDs was determined based on the speech discrimination score (SDS) at two signal to noise (S/N) ratios (0 and +5). Data were analyzed using SPSS 22.Results: The actual to nominal noise reduction rating values were from 47% to 84% for HPDs. At two S/N ratios, no significant differences were observed in speech intelligibility using HPDs (p >0.05). At S/N ratio=0, the speech intelligibility descriptively has been only improved by using common earmuffs up to 9.07 %. There was a significant difference up to 21.27% in speech intelligibility for proposed molded earplugs at S/N ratio=0 (p <0.05). Increasing the HPDs' noise attenuation values led to an increase in speech interference (p <0.05). The HPDs with the minimum required noise attenuation while maintaining acceptable speech intelligibility should be worn by employees exposed to medium noise levels.

scholarly journals The effect of hearing protection devices on speech intelligibility of Persian employees

2020 ◽  
Author(s):  
Mina Karami ◽  
Mohsen Aliabadi ◽  
Rostam Golmohammadi ◽  
Morteza Hamidi Nahrani
Keyword(s):  
Noise Reduction ◽  
Speech Intelligibility ◽  
Work Environments ◽  
Hearing Protection ◽  
Noise Attenuation ◽  
Speech Discrimination ◽  
Significant Difference ◽  
Protection Devices ◽  
Male Subjects ◽  
Attenuation Values

Abstract Objective: This study aimed to investigate the effect of hearing protection devices (HPDs) on speech intelligibility in Persian work environments. Three current earmuffs and three earplugs and one of the prototypes of molded earplug were tested on 15 male subjects which were randomly selected. The noise reduction of HPDs was measured based on the Real Ear Attenuation at Threshold (REAT) method. Speech intelligibility during using HPDs was determined based on the speech discrimination score (SDS) at two signal to noise (S/N) ratios (0 and +5). Data were analyzed using SPSS 22.Results: The actual to nominal noise reduction rating values were from 47% to 84% for HPDs. At two S/N ratios, no significant differences were observed in speech intelligibility using HPDs (p >0.05). However, at S/N ratio=0, the speech intelligibility descriptively has been improved by using common earmuffs up to 9.07 %. There was a significant difference up to 21.27% in speech intelligibility for proposed molded earplugs at S/N ratio=0 (p <0.05). Increase the HPDs' noise attenuation values lead to increase interference in the speech (p <0.05). The HPDs with the minimum required noise attenuation while maintaining acceptable speech ineligibility should be worn by employees exposed to medium noise levels.

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