Assessment of Noise Exposure of Sawmill Workers in Southwest,Nigeria  

作　　者：Abiola O.Ajayeoba Adewoye A.Olanipekun Wasiu A.Raheem Oluwaseun O.Ojo Ayowumi R.Soji-Adekunle 

机构地区：[1]Department of Mechanical Engineering,Ladoke Akintola University of Technology,Ogbomoso,Nigeria [2]Department of Civil Engineering,Ladoke Akintola University of Technology,Ogbomoso,Nigeria [3]Department of Systems Engineering,University of Lagos,Lagos,Nigeria [4]Department of Mechanical Engineering,Adeleke University,Ede,Nigeria

出　　处：《Sound & Vibration》2021年第1期69-85,共17页声音与振动（英文）

基　　金：the Tertiary Education Trust Fund(TETFUND)through the Institutional Based Research(IBR)(Ladoke Akintola University of Technology,Ogbomoso,Nigeria)(2016).

摘　　要：Economic wood processing employs the use of industrial machines for cutting,shaping,milling,and sawing timber,thereby leading to the generation of high levels of noise.Published data from empirical studies have categorized noise as an environmental hazard of global significance.Furthermore,noise exposure limits for different industries and all the industrial machines available has not been formally established as it presently exists in developed nations around the world.Therefore,this study assessed the daily exposure of sawmills workers to noise in Southwestern Nigeria.Reconnaissance surveys were first carried out in Osun,Oyo,Ondo,Ekiti,Lagos,and Ogun States to select sawmills that were fully operational and fit for the study.Two fully functional sawmills in two cities of each State were eventually selected for data collection,making a total of 24 sawmills,while the Circular Machines(CM),Planer Machines(PM),and Band-saw Machines(BM)were the machines in each sawmill considered.Two machines each of CM,PM,and BM were considered in each sawmill,making a total of forty-eight(48)machines each of CM,PM,and BM.Sound data were collected between 7 am and 7 pm each day for six days(between Monday and Saturday)using Extech 407732 sound level meter and all stabilized measurements were taken three times at different intervals.The data collected were in three different periods:Machine No-work Period(NPm),Machine Idle Period(IPm),and Machine Working Period(WPm).A two–way Analysis of Variance(ANOVA)was carried out at P<0.05 to determine whether there is a significant difference in the sound level average before and after the break,for both the idle and working periods of the three machines considered.This was also done to determine whether there is a signifi-cant difference between the sound level average of the results collected during idle and working periods of the three machines.Noise Pollution Levels(Lnp)ranged from 83.20 dB(PM)to 107.65(BM)and 93.42(CM and PM)–116.00(BM)respectively,while IPm also gave the least noise

关 键 词：SAWMILLS machines noise EXPOSURE POLLUTION WOOD 

分 类 号：X82[环境科学与工程—环境工程]