한국소음진동공학회논문집 (Transactions of the Korean Society for Noise and Vibration Engineering)

  • 제18권7호
  • /
  • Pages.711-717
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  • 2008
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  • 1598-2785(pISSN)
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  • 2287-5476(eISSN)
한국소음진동공학회 (The Korean Society for Noise and Vibration Engineering)
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노즐 분사력에 의해 가진되는 다중 패킷 블레이드계의 과도 진동 해석

Transient Vibration Analysis of a Multi-packet Blade System Excited by Nozzle Jet Forces

  • 임하성 (한양대학교 대학원 기계공학과) ;
  • 유홍희 (한양대학교 기계공학부)
  • 발행 : 2008.07.20
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초록

A modeling method for the modal and the transient vibration analysis of a multi-packet blade system excited by nozzle jet forces is presented in this paper. Blades are idealized as cantilever beams and the elastic structures like disc and shroud connecting blades are modeled as coupling stiffnesses. A modified Campbell diagram is proposed to identify true resonance frequencies of the multi-packet blade system. Different from the SAFE diagram that employs three dimensional space, the modified Campbell diagram Proposed in this study employs a plane to find the true resonance frequencies. To verify the existence of true resonance frequencies, nozzle jet forces are modeled as periodic forces and transient vibration analysis were performed with the modeling method.

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참고문헌

  1. Southwell, R. and Gough, F., 1921, 'The Free Transverse Vibration of Airscrew Blades', British A. R. C. Reports and Memoranda No.766
  2. Schilhansl, M., 1958, 'Bending Frequency of a Rotating Cantilever Beam', J. of Appl. Mech. Trans. Am. Soc. Mech. Engrs, 25, pp. 28-30
  3. Kane, T., Ryan, R. and Banerjee, A., 1987, 'Dynamics of Cantilever Beam Attached to a Moving Base', J. of Guidance, Control, and Dynamics, 10, pp. 139-151 https://doi.org/10.2514/3.20195
  4. Yoo, H., Ryan, R. and Scott, R., 1995, 'Dynamics of Flexible Beams Undergoing Overall Motions', J. of Sound and Vibration, Vol. 181, No. 2, pp. 261-278 https://doi.org/10.1006/jsvi.1995.0139
  5. Yoo, H. and Shin, S. W., 1998, 'Vibration Analysis of Rotating Cantilever Beams', J. of Sound and Vibration. Vol. 212, No. 5, pp. 807-828 https://doi.org/10.1006/jsvi.1997.1469
  6. Yoo, H. and Choi, C. M., 2000, 'Dynamics of a Rotating Cantilever Beam Near Its Critical Angular Speed', Transactions of the KSME, Vol. 24, No. 5, pp. 1231-1237
  7. Singh, M. P. and Schiffer, D M., 1982, 'Vibrational Characteristics of Packeted Bladed Discs', ASME Paper No. 82-DET-137
  8. Dello, J., 1987, 'Frequency Evaluation of a Steam Turbine Bladed Disk', Turbomachinery International Magazine, Jan., Fab.
  9. Singh, M. P., Vargo, J. J., Schiffer, D. M. and Dello, J. D., 1988, 'Safe Diagram-A Design Reliability Tool for Turbine Blading', Proceedings of the Seventeenth Turbomachinery Symposium, Turbomachinery Laboratory, Texas A&M University, Clooege Station, Texas, pp. 93-101
  10. Bloch, H., P., 1996, 'A Practical Guide to Steam Turbine Technology', New York, N.Y.: McGraw-Hill
  11. Yoo, H. H., 1991, 'A Linear Dynamic Modeling Using Hybrid Deformation Variables for Rotating Structures', KSAS, Vol. 19, No. 3, pp. 32-39
  12. Kane, T. and Levinson, D., 1985, 'Dynamics : Theory and Applications', McGraw-Hill Book Co., New York, N.Y.