• Title/Summary/Keyword: 소음 방사

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A Study on the Radiated Noise the Prediction in the Pipe by Fluid Induced Vibration using the Radiation Efficiency and Pipe Surface Vibration (배관 표면진동과 방사효율을 이용한 배관 소음예측기법 연구)

  • Yi, Jongju;Park, Kyunghoon;Jung, Woojin;Seo, Youngsoo
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.24 no.10
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    • pp.763-769
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    • 2014

  • This study is on the experiment and prediction of the pipe noise due to the internal fluid. The vibration of pipe external surface and noise in air were measured according to the internal fluid velocity and pipe type. In the experiment, the vibration and noise level of the straight pipe and rounded pipes show that the vibration and noise level are almost same. The 900 mitred pipe shows the high vibration and noise level. In the prediction of noise due to the internal flow, the method using the pipe surface vibration and radiation efficiency shows good agreement with experimental result.

  • https://doi.org/10.5050/KSNVE.2014.24.10.763 인용 PDF KSCI KPUBS HTML

A Study on Noise Radiation of Compressor Shell (압축기 쉘의 방사소음에 관한 연구)

  • Chae, Seung-Hoon;Hwang, Won-Gul;Oh, Il-Kwon;Park, Sung-Woo;Ryu, Ki-O
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2005.11a
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    • pp.164-167
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    • 2005

  • The noise level of refrigerating units is becoming more important to the manufacturer and the user of the product. Invariably, the compressor is a significant contributor to the overall noise level. Especially a major portion of the noise radiated by the vibration of the compressor shell. This paper presents an approach to relate the dynamic characteristics of the compressor shell with the noise radiation properties and the methods of redesigning the compressor shell to reduce the noise radiation. To relate the dynamic characteristics of the compressor shell with the noise radiation properties, the vibration and radiated sound were measured with the running compressor. Based on the results of these tests correlations between the shell vibration characteristics and the noise radiation properties are identified It was found that the vibration on the compressor shell and the noise radiated from the compressor were stronglycorrelatedincertainfrequencybands.

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