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《Academic Journal of Second Military Medical University》 1984-03
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THE ATTENUATION SURVEY OF A HIGH-LOW FREQUENCY EARPLUG

Gao Wenyuan, et alDepartment of Prophylaxis in Naval Medicine  
Earplugs have effects on preventing noise. Many earplugs developed, when being used, may hinder speech communication because of their lack in frequency selectivity of attenuation.A new type earplug called a high-low frequency(HLF)earplug has been desingned. There is a Zigzag channel in the earplug, which lets speaking tones pass and absorbes high frequency noise. So it doesn't influence communication. And it could attenuate noise if channel be closed as well in an environemt with low frequency.According to Iso4869-1981 standard. HLF earplug's average attenuation is 29.1 dB. When the channel is opened its attenuation will be below 10 dB at low frequency; about 30 dB at high frequen-cy.
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【Co-references】
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【Secondary References】
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1 HAN Yong-li1,CHEN Yang2,CHEN Long-zhu1(1.Institute of Engineering Safety & Disaster Prevention,Shanghai Jiaotong University,Shanghai 200240,China;2.Shanghai Real Estate Science Research Institute,Shanghai 200031,China);Simulation on Anti-blast Ability of Masonry Wall under Gas Explosion Load Based on LS-DYNA[J];Journal of Disaster Prevention and Mitigation Engineering;2010-03
2 HAN Yong-li1,CHEN Long-zhu2(1.ACO Architects and Consultants,Shanghai 200232,P.R.China;2.Institute of Engineering Safety & Disaster Prevention,Shanghai Jiaotong University,Shanghai 200240,P.R.China);Failure Analysis of Residential Buildings under the Gas Explosion Accident[J];Journal of Civil,Architectural & Environmental Engineering;2011-06
3 HAN Yong-li1,CHEN Long-zhu1,CHEN Yang2(1.Institute of Engineering Safety & Disaster Prevention,Shanghai Jiao Tong University,Shanghai 200240,China;2.Shanghai Real Estate Science Research Institute,Shanghai 200031,China);Numerical Analysis of Civil House Wall under Gas Explosion Load[J];Building Science;2010-09
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