소음진동 (Journal of KSNVE)

한국소음진동공학회 (The Korean Society for Noise and Vibration Engineering)
권호 표지

반무한보의 진동 인텐시티 계측에 대한 연구

A Study on Structural Intensity Measurement of Semi-infinite Beam

  • 발행 : 1997.02.01
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초록

This paper investigated the practical use for measuring the structural intensity (power flow per width of cross section) in a uniform semi-infinite beam in flexural vibration. The structural intensity is obtained as a vector at a measurement point, One-dimensional structural intensity can be obtained from 4-point cross spectral measurement, or 2-point measurement on the assumption of far field. The measurement errors due to finite difference approximation and phase mismatch of accelerometers are examined. For precise measurements, it would be better to make the value of k$\delta$(wave number x space between accelerometers) between 0.5 and 1.0. Formulation of the relation between bending waves in structures and structural intensity makes it possible to separate the wave components by which one can get a state of the vibration field. Experimental results are obtained from 2- and 4-point measurement performed at 200mm (near field) and 400mm (far field) apart from excitation point in random excitation. the results are compared with the theoretical values and measured values of input power spectrum in order to verify the accuracy of structural intensity method, 2-point method is suggested as the practical structural intensity method.

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참고문헌

  1. Journal of the Acoustical Society of America v.47 no.1 Measurement of Power Flow in Uniform Beams and Plates Noiseux, DU
  2. Journal of Sound and Vibration v.49 no.2 Measurement of Structure Borne Wave Intensity, Part I: Formulation of the Methods Pavic, G
  3. 한국소음진동공학회지 v.4 no.2 Structural intensity법을 이용한 구조체의 진동 전달량 측정 김홍식
  4. Journal of Sound and Vibration v.70 no.1 Cross Spectral Density Methods for Measuring Structure Borne Power Flow on Beams and Pipes Verheij, J. W.
  5. Journal of Sound and Vibration v.112 no.1 Experiments on the Active Control of Flexural Wave Power, Redman-White, W;Nelson, P. A.;Curtia, A. R. D
  6. 日本機械學會論文集(C編) v.57 no.535 振動インテンシテイ計測に關する基礎硏究(第1報, 理論的檢討) 鎌田 實;島谷 和憲
  7. 日本機械學會論文集(C編) v.57 no.536 振動インテンシテイ計測に關する基礎硏究(第2報, 實驗 および考察) 鎌田 實;島谷 和憲
  8. Third International Congress of Air- and Structure-Bone Sound and Vibration Theoretical and Experimental analysis of power flow in beam structures Hong, Y.;Wu, Q.;Lim, M. K.
  9. CETIM 3rd International Congress on Intensity Techniques Senlis-France Waves, Intensities, and Powers in Structures Heckl, M.
  10. CETIM 3rd International Congress on Intensity Techniques Senlis-France Structure Borne Intensity in Straight and Curved Bars Kurtz, P.
  11. CETIM 3rd International Congress on Intensity Techniques Senlis-France Structural Intensity and Vibration Energy Flow on Inhomogeneous Shells of Arbitrary Shape Allan D. P.
  12. Journal of Sound and Vibration v.153 no.1 Estimation of Bending Wave Intensity in Beams using the Frequency Response Technique, Linjama, J.;Lahti, T.
  13. Journal of Sound and Vibration v.135 no.3 Laser Vibrometer : Pseudo-Vibrations Rothberg, S. J.;Baker, J. R.;Halliwell, N. A
  14. PhD Thesis, The Pennsylvania State University Development and Evaluation of Laser Doppler Techniques for Measurements of Flexural and Longitudinal Structural Intensity McDevitt, J. E.
  15. Third International Congress of Air- and Structure-borne Sound and Vibration Application of Structural Imaging for Acoustic Radiation Prediction using a Scanning Laser Doppler Vibrometer Montgomery, D. E.;West, R. L.;Burdisso, R. A.
  16. CETIM 3rd International Congress on Intensity Techniques Senlis-France A Laser Probe for Measurements of inplane Structural Vibrations Lee, D.;Berthelot, Y. H.;Jarzynski, J.
  17. 日本機械學會論文集(C編) v.59 no.558 一次振動 インテンシテイ計測における測定條件の設定 柴田 勝久;加藤 正名;高津 宣夫;加藤 正名
  18. Wave Motion in Elastic Solids Graff, K. F.
  19. 울산대학교 공학연구논문집 v.26 no.2 1차원 구조물 내에서 진동 인텐시티의 계측에 대한 연구 이덕영;박성태
  20. Journal of Sound and Vibration v.75 no.4 Statistical Erros in Acoustic Intensity Measurements Seybert, A. F.