Study On The Relationship Between Noise In Aircraft Manufacturing As Well As Noise Sensitivity And Workers' Hearing Loss

Noise was considered as the first one of the seven professional hazardous factors, which affected every system seriously, especially the hearing system. The aim of this study was to research the relationship between different noise indices as well as noise sensitivity and workers' hearing loss based on comprehensive studies and current pollution situation of aircraft manufacturing. Content included: study on the relationship between noise and cumulative noise exposure (CNE) as well as low frequency noise-induced hearing loss (LFNIHL) and high frequency noise-induced hearing loss (HFNIHL); study on the relationship between noise sensitivity as well as LFNIHL and HFNIHL.1 Study on the relationship between noise and CNE as well as LFNIHL and HFNIHL657 data concerning workers' hearing check-up were collected including such types of work as Trial pilots and Riveters. 199 belonged to Trial pilots and 458 were Riveters.Trial pilots's and Riveters's noise intensity was 104 and 120dB(A)respectively, all of which exceeded their own healthy standard. The noise of Trial pilots was mainly intermediate or high frequency, and that of Riveters was high frequency. The other physical indices such as temperature, humidity and wind speed all accorded with national standards.Results showed: The rates of Riveters's tinnitus, deafness, insomnia, dizziness, fatigue and tympana sunken, incrassated, perforated were higher than those of Trial pilots, and all had statistically significant difference (P<0. 05) except in dizziness and fatigue. Trial pilotss' s and Riveters' s LFNIHL and HFNIHL were 10.05%. 28.60% and 64.32%, 81.66% respectively, while LFNIHL and HFNIHL of Riveters were higher that those of Trial pilots (P<0. 05) ; noise badly influenced male' s light and intermediate hearing loss (P<0. 05) as for female, and the differences between male' s and female' s heavy hearing loss and deafness. But male' s HFNIHL was more seriously injured by noise than female's (P<0. 05) ; Trial pilots' s and Riveters' s hearing loss all increased with the augment of length of work; Male' s and female' s LFNIHL grown with the enhancement of CNE; the higher the CNE, the more serious the HFNIHL; low CNE had an more severe impact on male' LFNIHL than that on female's(P<0. 05 ), but intermediate and high CNE had no such impact; low and high CNE had an bad effect on male'sHFNIHL than that on female's (P<0. 05) , but there was no significant difference in intermediate CNE.2 Study on the relationship between noise sensitivity as well as LFNIHL and HFNIHLRandomly sampled 280 workers including Trial pilots and Riveters based on the research mentioned above. There were 81 persons in Trial pilots and 199 were ranked as Riveters.Results showed that Self-Report Noise Sensitivity Scale was used to test workers' noise sensitivity. Intermediate noise sensitivity (INS) counted for the highest rate and the low noise sensitivity (LNS) was the lowest whatever Trial pilots or Riveters. There were no statistical indices regarding the relationship between noise sensitivity as well as LFNIHL and HFNIHL except the followings: the HFNIHL of INS of Riveters was more bad than that of Trial pilots as well as HFNIHL of INS of male was more serious than that of female. Such results supposed that whether INS could become a predicted factor in order to protect workers' hearing loss and decrease HFNIHL.In summary, this study found that current circumstance brought adverse effects to workers' hearing loss. So we suggested that circumstance should be improved and earplugs should be used.