Reducing Occupational Noise Propagated from Centrifugal Fan through Dissipative Silencers:A Field Study
作者机构:Department of Occupational Health and SafetySchool of Public HealthQazvin University of Medical SciencesQazvinIran Department of Occupational Health and SafetySchool of Public HealthKerman University of Medical SciencesKermanIran Department of Occupational Health EngineeringBehbahan Faculty of Medical SciencesBehbahanIran
出 版 物:《Sound & Vibration》 (声音与振动(英文))
年 卷 期:2021年第55卷第1期
页 面:31-41页
核心收录:
学科分类:1201[管理学-管理科学与工程(可授管理学、工学学位)] 1002[医学-临床医学] 07[理学] 0837[工学-安全科学与工程] 0802[工学-机械工程] 0701[理学-数学] 0702[理学-物理学] 0801[工学-力学(可授工学、理学学位)] 0823[工学-交通运输工程] 070101[理学-基础数学]
主 题:Absorbent density dissipative silencer fan noise porosity
摘 要:Acoustic performance of dissipative silencer was evaluated to determine the effectiveness of perforated duct porosity and absorbent material density in reducing occupational noise exposure propagated from centrifugal *** charts were applied to predict noise reduction and length of a dissipative *** silencers with various punched duct porosity(14%,30%and 40%)and sound absorbent density(80 Kg/m^(3),120 Kg/m^(3),and 140 Kg/m^(3))were designed and *** to ISO9612 and ISO11820,noise level was measured before and after installing all nine test silencers at fixed workstations around the discharge side of a centrifugal fan in a manufacturing *** average,the noise level at the discharge side of a fan without silencer was measured to be 93.6 dBA,whereas it was significantly mitigated by 67.4 dBA to 70.1 dBA after installing all *** insertion loss for a dissipative silencer with 100 cm length was predicted to be 27.9 dB,which was in agreement with experimental ***,there was no significant differences between insertion loss of silencers,the one with 30%porosity and 120 Kg/m^(3)rock wool density had the highest insertion loss of 26.2 *** silencers noticeably reduced centrifugal fan noise *** sound absorbent density and duct porosity up to a certain limit could probably be effective in noise reduction of dissipative silencers.