摘要：Background: The adverse effects of noise are well known and noise problems due to industrialization of communities are increasing over the time. Oil industries due to the process and nature of production; contain many noise sources such as compressors, turbines, and pumps, which cause excessive noise exposure. The objective of this study was to evaluate the noise characteristics of compressors in Tehran Oil Refinery and study on visible control measures.  Methods: To get to the appropriate control method, procedures such as basic theories , measuring sound parameters , frequency analysis, related diagrams and noise propagation schemes due to the measurement results, equivalent noise exposure level (L eq(8h) ) and exposure noise dose and  technical specification of compressors are considered in this paper. Considering field and analytical reÂsults, module enclosure with particular specifications (like absorbent layer, specific wall, window and door design etc.) is predicted to be the best control method.  Results: Calculation results of multiple layer density of the enclosure (W = 16.5 kg/m 2 ) and needed density for the dominant frequency of the source (W = 12 kg/m 2 ) demonstrated that the designed enclosure satisfies the goal. Conclusion: Results of designing sandwich layers’ module demonstrated that installÂing the designed enclosure causes 20 dB(A) reduction in total sound presÂsure level of the source’s dominant frequency.
其他摘要：Background: The adverse effects of noise are well known and noise problems due to industrialization of communities are increasing over the time. Oil industries due to the process and nature of production; contain many noise sources such as compressors, turbines, and pumps, which cause excessive noise exposure. The objective of this study was to evaluate the noise characteristics of compressors in Tehran Oil Refinery and study on visible control measures.  Methods: To get to the appropriate control method, procedures such as basic theories , measuring sound parameters , frequency analysis, related diagrams and noise propagation schemes due to the measurement results, equivalent noise exposure level (L eq(8h) ) and exposure noise dose and  technical specification of compressors are considered in this paper. Considering field and analytical reÂsults, module enclosure with particular specifications (like absorbent layer, specific wall, window and door design etc.) is predicted to be the best control method.  Results: Calculation results of multiple layer density of the enclosure (W = 16.5 kg/m 2 ) and needed density for the dominant frequency of the source (W = 12 kg/m 2 ) demonstrated that the designed enclosure satisfies the goal. Conclusion: Results of designing sandwich layers’ module demonstrated that installÂing the designed enclosure causes 20 dB(A) reduction in total sound presÂsure level of the source’s dominant frequency.
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