The Journal of the Acoustical Society of Korea (한국음향학회지)

The Acoustical Society of Korea (한국음향학회)
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Prediction of acoustic radiation efficiency for trapezoidal corrugated plates

사다리꼴 주름평판의 음향방사효율 해석

  • 유정수 (울산대학교 조선해양공학부) ;
  • 장승호 (한국철도기술연구원 교통환경연구실)
  • Received : 2023.02.21
  • Accepted : 2023.03.16
  • Published : 2023.03.31
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Abstract

Trapezoidal corrugated plates are often treated as orthotropic plates to simplify the modelling of the corrugation. However, this simplification is not valid at high frequencies in which the localized vibration within the parts of corrugation takes place. In this study, the vibrational and acoustical characteristics of corrugated plates are investigated up to high frequencies by means of the wavenumber domain numerical approach. Based on the findings from this numerical analysis, an approximate method to predict vibro-acoustic characteristics of corrugated plates is proposed. This approximate model consists of four equivalent plates which can represent global and local behaviours of corrugated plates. The radiation efficiency of corrugated plates is predicted from the approximate model and validated through the comparison with those of the numerical method.

사다리꼴 주름평판은 복잡한 주름 모델링으로 인해 흔히 직교이방성평판으로 단순화하여 해석한다. 그러나 고주파수 대역에서는 주름의 국부 진동으로 인해 직교이방성평판 모델이 유효하지 못하다. 본 연구에서는 파수영역수치해석기법을 이용하여 사다리꼴 주름평판의 고주파수 대역 진동 및 소음 특성을 규명하고, 이를 토대로 주름평판의 주파수 대역별 진동 및 소음 특성을 반영한 근사계산 방법을 제안한다. 근사계산에서는 전역 및 국부 진동을 반영할 수 있도록 주름평판을 네 개의 평판모델로 구성하였으며, 근사계산을 통해 구한 방사효율을 수치해석 결과와 비교함으로써 방법의 신뢰성을 검증하였다.

Keywords

Acknowledgement

본 연구는 한국철도기술연구원 기본사업 '차내소음과 차륜 진동에 대한 설계 및 관리 핵심기술 개발(PK2303D1)" 과제 및 정부(과학기술정보통신부) 재원으로 한국연구재단의 지원(No. 2019R1F1A1046725)을 받아 수행되었습니다.

References

  1. R. M. Windle, The prediction of industrial noise and its transmission through metal cladding systems, (Ph. D. thesis, University of Salford, 1995).
  2. D. A. Bies and C. H. Hansen, Engineering Noise Control, Theory and Practice, third edition (Spon Press, London and New York, 2003), pp. 340-361.
  3. C. Hopkins, Sound Insulation (Routledge, London and New York, 2014), pp. 409-454.
  4. J. S. Anderson and M. Bratos-Anderson, "Radiation efficiency of rectangular orthotripic plates," Acta Acust. United Ac. 91, 61-76 (2005).
  5. A. Samanta and M. Mukhopadhyay, "Finite element static and dynamic analysis of folded plates," Eng. Struct. 21, 277-287 (1999). https://doi.org/10.1016/S0141-0296(97)90172-3
  6. M. E. Biancolini, C. Brutti, and L. Reccia, "Approximate solution for free vibrations of thin orthotropic rectangular plates," J. Sound Vib. 288, 321-344 (2005). https://doi.org/10.1016/j.jsv.2005.01.005
  7. S. Kim, H. Lee, J.-T. Kim, and J. Kim, "Sound insulation design of the corrugated steel panel considering local resonance" (In Korean), Trans. Korean Soc. Noise Vib. Eng. 20, 672-676 (2010). https://doi.org/10.5050/KSNVE.2010.20.7.672
  8. C. M. Nilsson, C. J. C. Jones, D. J. Thompson, and J. Ryue, "A waveguide finite element and boundary element approach to calculating the sound radiated by railway and tram rails," J. Sound Vib. 321, 813-836 (2009). https://doi.org/10.1016/j.jsv.2008.10.027
  9. J. Ryue and S. Jang, "Numerical analysis of rail noise regarding surface impedance of ground by using wavenumber domain finite and boundary elements" (in Korean), JKSR, 18, 289-300 (2015). https://doi.org/10.7782/JKSR.2015.18.4.289
  10. H. Kim, J. Ryue, D. J. Thompson, and A. D. Muller, "Application of wavenumber domain numerical method to the prediction of the radiation efficiency and sound transmission of complex extruded panels," J. Sound Vib. 449, 98-120 (2019).
  11. G. Xie, D. J. Thompson, and C. J. C. Jones, "The radiation efficiency of baffled plates and strips," J. Sound Vib. 280, 181-209 (2004).
  12. H. Li, G. Squicciarini, D. J. Thompson, J. Ryue, X. Xiao, D. Yao, and J. Chen, "A modelling approach for noise transmission through extruded panels in railway vehicles," J. Sound Vib. 502, 116095 (2021).
  13. I. Prasetiyo, Investigation of sound transmission in lightweight structures using a waveguide finite element/boundary element approach, (Ph. D. thesis, University of Southampton, 2012).