Uncertainty evaluation of noise measurement in welding workshop of a large automobile manufacturing plant in Tianjin

Abstract

Abstract: Objective Noise is the main occupational hazard factor in automobile manufacturing plants. Through the uncertainty evaluation of noise measurement in welding workshop of a large automobile manufacturing plant in Tianjin,the source of uncertainty,quantitative calculation,evaluation method and reporting methods of measurement results were expounded. Methods According to GBZ/T 189.8-2007 "Measurement of Physical Factors in the Workplace Part 8：Noise",GBZ 2.2-2007 "Occupational Exposure Limits for Hazardous Factors in the Workplace Part 2：Physical Factors" and GB/T 21230-2014 "Engineering Method for Determination of Occupational Noise Exposure in Acoustics",from June 2022 to February 2023,the 30 representative operators from parts mounting position,assembly position and mold repair position in the welding workshop were selected for noise measurement. Using explosion-proof individual noise dosimeters,develop a reasonable measurement plan,read and record the A-weighted equivalent continuous sound pressure level（L_p,A,eqT,n） of three positions operators,calculate the A-weighted 8-hour exposure sound level（L_{AE,8 h}） for each positions,and conduct uncertainty evaluation. Results Calculation showed that L_{AE,8 h} of parts mounting position,assembly position and mold repair position were 83.8,84.6,80.5 dB（A）,with expanded uncertainty of 3.3,3.6,3.3 dB（A）（k=1.65）.The calculated L_{AE,8 h} of parts mounting position and assembly position was below the exposure limit of 85 dB（A） but could include 85 dB（A）（confidence level：90%）.The L_p,A,eqT,n of part of the workers in parts mounting position and assembly position didn’t meet the occupational exposure limit requirements for noise in GBZ 2.2-2007. Conclusion The evaluation of noise uncertainty characterizes the dispersion and degree of suspicion of noise measurement results,with the main source of uncertainty being measurement operations.It is recommended to maintain and update noise control facilities,strengthen on-site management of wearing ear protectors as required,and implement relevant health monitoring and management systems.

Key words: Uncertainty evaluation, Expand uncertainty, Workplace, Noise measurement, Quality control

CLC Number:

R135

HAN Cheng, LI Xinrong, WANG Xuesong, LIU Jing, ZENG Qiang. Uncertainty evaluation of noise measurement in welding workshop of a large automobile manufacturing plant in Tianjin. [J]OCCUPATION AND HEALTH, 2024, 40(18): 2459-2463.

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