Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Damping Characterization of the Double-skin Aluminum Extruded Panels for Rolling Stock Carbody

철도차량 차체용 더블 스킨 알루미늄 압출 패널의 감쇠특성

  • 강길현 ((주) 현대로템) ;
  • 김철수 (한국교통대학교 철도차량시스템공학과)
  • Received : 2013.06.07
  • Accepted : 2013.07.11
  • Published : 2013.07.31
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Abstract

When car builder designs the large carbody structure of railway vehicles, it is necessary to optimize the damping characteristics through the analysis of structure borne noise such as sound pressure level(SPL). This paper is a study on the structure borne noise analysis by characterizing the damping of double skin aluminum extruded panels for rolling stock carbody. The normalized SPL was calculated based on the simple source theory using measured mechanical mobility parameters from vibration tests(i.e. point, transfer and modal mobility). The reduced SPL was predicted by using finite element method by applying loss factor of damping material into laminated shell elements. It was found out that the damping material coated on the panels like underframe, which part is seriously affected by vibration during train run, took effect to reduce noise level.

철도차량 차체 설계시 음압레벨에 따른 소음해석을 통한 차체 패널의 감쇠특성을 최적화하는 것이 필요하다. 본 논문은 철도차량 차체용 알루미늄 더블스킨 압출패널의 진동감쇠특성 해석을 통한 철도차량 차체의 구조소음 해석에 관한 연구이다. 주파수응답 가진시험을 통하여 측정된 기계적 모빌리티 값인 포인트 모빌리티, 트랜스퍼 모빌리티, 모달 모빌리티와 단순음원이론을 사용하여 정규화된 음압을 계산하였다. 도포용 감쇠재의 감쇠값을 라미네이티드 쉘요소에 사용하여 유한요소해석을 수행함으로써, 감쇠처리에 의한 소음감소수준 예측을 하였다. 또한 실제 차량 구조와 유사한 고정경계조건의 감쇠특성해석을 통하여 열차주행시 발생하는 진동의 영향을 크게 받는 언더프레임과 같은 부위에 일정 두께의 감쇠재 코팅이 진동 및 소음억제에 큰 효과가 있을 것으로 사료된다.

Keywords

References

  1. S. H. Kim, J. C. Park and J. N. Kim, "Sound Transmission Loss of Aluminum Extruded Panels for Railway Vehicles", Trans. of the Society for Noise and Vibration Eng., Vol. 10, No. 10, pp.662-668, 2000.
  2. K. J. Kim, J. H. Lee, D. Y. Kim and S. H. Kim, "A Method Of Analysis To Predict Sound Transmission Loss Of An Extruded Aluminum Panel For Used On Railways Vehicles", Journal of the Korean Society for Railway, Vol. 16, No. 1, pp.20-25, 2013. DOI: http://dx.doi.org/10.7782/JKSR.2013.16.1.020
  3. C. S. Kim and G. H. Kang, "Fatigue Analysis of Reduction Gears Unit in Rolling Stock Considering Operating Characteristics", Journal of the Korea Academia-Industrial cooperation Society, Vol. 12, No. 3, pp.1085-1090, 2011. DOI: http://dx.doi.org/10.5762/KAIS.2011.12.3.1085
  4. S. H. Ahn, K. W. Chung, S. H. Jang and C. S. Kim, "Durability Evaluation of the Korean Gauge-Adjustable Wheelset System", Journal of the Korea Academia- Industrial cooperation Society, Vol. 13, No. 12, pp.5669-5675, 2012. DOI: http://dx.doi.org/10.5762/KAIS.2012.13.12.5669
  5. M. H. Park and C. S. Kim, "Conceptual Design on Doorstep Equipments Used for Low and High Level Railway Platforms", Journal of the Korea Academia-Industrial cooperation Society, Vol. 13, No. 9, pp.3882-3888, 2012. DOI: http://dx.doi.org/10.5762/KAIS.2012.13.9.3882
  6. J. W. Dunn, O. A. Olatunbosun, and B. Mills, "Prediction Of Low Frequency Sound Pressure Distribution Inside A Vehicle Passenger Compartment From Its Structural Dynamic Response", Journal of Society of Environment Engineers, Vol. 19, No. 3, pp.11-16, 1980.
  7. O. A. Olatunbosun and K. W. Cheng, "Vibro-Acoustic Assessment of Vehicle Body Structures and Trim Materials", Int. J. of Vehicle Design, Vol. 16, Nos 4/5, pp.464-476, 1995.
  8. K. Gatzwiller and H. Herlufsen, How to Determine the Modal Parameters of Simple Structure, pp.1-8, Application Note, Bruel & Kjaer., 2001
  9. Ewins D. J., Modal Testing; Theory and Practice, pp.153-208, Research Studies Press LTD, 1984.
  10. O. A. Olatunbosun, Mechanical Mobility Approach to Assessing the Dynamic Performance of Vehicle Structures, Ph.D. Thesis, The University of Birmingham, 1976.
  11. Gil Hyun Kang, The Characterization of the Damping properties of Beams and Panels for application to Vehicle Body Structure, pp.131-132, Ph.D. Thesis, The University of Birmingham. 2001.
  12. ASTM E 756: 2005, Standard Method for Measuring Vibration -Damping Properties of Materials, American Society for Testing and Materials, 2005.
  13. Oberst H. unter Mitwirkung von Frankenfeld, K., Uber die Dampfung der Bigeschwingungen Dunner Bleche durch Fest Haftende Belage, Acustica, Vol. 2, Akustische Beiheft 4, pp.AB181-AB194, 1952.