Repository of Research and Investigative Information

Repository of Research and Investigative Information

Kurdistan University of Medical Sciences

Enclosure design for noise control of air blower in the typical steel industry

(2014) Enclosure design for noise control of air blower in the typical steel industry. Iran Occupational Health.

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Background and aims: In the steel industry, air blowers used to supply compressed air are considered as sources of annoying noise. This study aims to design an acoustic room chamber in order to control the noise level of the air blower. Methods: Measuring of the noise level along with frequency analysis was performed by using sound level meter, model of CASELLA-Cell.450. Dosimetery was performed in order to assess the worker's exposure using the dosimeter model TES-1345. Linear sound power level of machine was calculated based on ISO-3746. Distribution of noise emission of the source was shown in form of workroom noise maps using Surfer software. Acoustic analysis of workroom was performed based on sound absorption characteristic of internal surfaces. In order tocontrol noise level, an enclosure along with condensed sandwich panels was designed for blower and finally, the effect of this intervention was estimated. Results: The results showed that the total sound pressure level of the air blower was 95.4dB (Lin) in which the dominant frequency was 2000 Hz. Moreover, sound power level of the air blower in the dominant frequency was 102.94dB (Lin). The effective absorption surface of workroom was estimated equal to 0.082 and the average occupational noise exposure level based on noise dose was equal to 230. By designing the enclosure along with the steel and fiberglass as a primary insulation layer and punched steel sheet as absorption layer on internal surfaces, the actual transmission loss in the dominant frequency, by taking into account the 0.001 of leakage was estimated as 30dB. Conclusion: gearbox and compressor were two main sources of air blower noise due to the spiral gearing wheels spinning rotor gearbox parts and the interaction between the rotary and fixed blades and the movement of air through the compressor. Following the enclosure design, the noise dose received by worker was reduced to less than 20 percent.

Item Type: Article
Keywords: Acrostic analysis; Air blower; Module design; Noise control; Steel industry
Page Range: pp. 1-12
Journal or Publication Title: Iran Occupational Health
Volume: 11
Number: 2
Publisher: Tehran University of Medical Sciences and Health Services
ISSN: 17355133
Depositing User: مهندس جمال محمودپور

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