• Title/Summary/Keyword: 방사소음

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Acoustic Radiation Analysis of Stiffened Cylindrical shell and Vibrational Velocity by FFT (보강 원통형 몰수체의 음향방사 해석과 FFT에 의한 진동 해석)

  • 배수룡;이헌곤;홍진숙
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 1993.04a
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    • pp.128-133
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    • 1993

  • 본 연구에서는 보강 원통쉘에 대하여 주위 유체의 영향을 고려하여 진동 및 음향방사를 해석하였다. 원통셀의 운동방정식은 Donnell 이론을 적용하였으 며, Contour 적분을 풀지 않고 FFT 알고리즘(Fast Fourier Transform Algorithm)을 이용하여 원통쉘의 진동을 계산하였다. 현재까지의 방사패턴에 관한 연구는 주로 원주 방향에 집중되어 왔으나, 보강 원통쉘의 방사패턴은 원추파 모형에 가까우므로 극좌표 .theta. 방향에 대한 음향방사 패턴에 관한 연구가 이루어져야 한다. 그러므로, 본 연구에서는 극좌표에 관한 방사패턴 에 관하여 주로 고찰하였다.

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A study of noise source identification on plate excited structure borne sound by acoustic intensity method (음향인텐시티법에 의한 고체진동 가진판의 소음원 검출에 관한 연구)

  • 오재응;김상헌;홍동표;이찬홍
    • Journal of the korean Society of Automotive Engineers
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    • v.8 no.4
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    • pp.43-55
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    • 1986

  • In the studies of noise reduction, it is important to know the generation mechanism of noise in order to identify the noise source. The relation between the structural vibration and the radiated sound is very complex and so this paper deals with a simplified radiation model that was originally developed as a verification tool for the acoustic intensity measurement procedure. As the first step for the identification of the noise source, this study deals with the noise evaluation by measuring sound pressure. On the next step, the acoustic radiational pattern is determined by the acoustic intensity method and this paper established that the acoustic intensity method is effective on the detection of noise. In the study, furthermore, the method could be used to predict the change in the sound radiational characteristics with the attachment of absorber and could be used in determining the attachment position.

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Analysis of the noises of maneuvering vessels and design of systems which can generate asymptotic noises (기동함정의 소음분석 및 유사 방사음 발생기의 설계)

  • 윤병우;송종관;신종욱
    • Journal of the Institute of Convergence Signal Processing
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    • v.5 no.2
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    • pp.106-110
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    • 2004

  • The noise characteristics of the submarines and vessels are composed of tonal signals and background noises. Tonal signals are from the revolution of the motors or engines, and background noises are from the generation and disappearing of the bubbles around the vessels. We analyze the noises from maneuvering underwater vessels with ATW algorithm. We design broadband asymptotic noise generator using Hilbert transform and design the system which can generate asymptotic noise with sum of generated background noise and synthesized tonal signals. This system can be used as a cheating system from the torpedo shacks.

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