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

The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
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Torsional Modal Testing of a Non-ferromagnetic Shaft by Magnetostrictive Patch Transducers

자기변형 패치 트랜스듀서를 이용한 비자성 축의 비틀림 모달 테스팅

  • 조승현 (서울대학교 정밀기계설계공동연구소) ;
  • 한순우 (서울대학교 정밀기계설계공동연구소) ;
  • 박찬일 (서울대학교 대학원 기계항공공학부) ;
  • 김윤영 (서울대학교 기계항공공학부)
  • Published : 2006.08.01
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Abstract

Torsional vibration is an important vibration mode when shafts, cylinders and pipes are considered. However, the modal testing of torsional vibrations is not an easy task to carry out because of the lack of proper transducers. This work presents a new torsional vibration transducer based on the magnetostrictive principle and its application to torsional modal testing. The transducer is so designed as to generate/measure only torsional vibrations excluding other vibration modes such as longitudinal and bending vibrations. The transducer is composed of ferromagnetic patches bonded to a test structure, permanent magnets, and a solenoid. Though patches and magnets are bonded to a structure, torsional vibrations are generated and measured wirelessly by a solenoid encircling a test structure. The proposed transducer works even at considerably high frequencies, say, tens of kilohertz. Furthermore, the transducer can be manufactured at a low price. To check the performance of the proposed method, the torsional modal testing on a hollow aluminum shaft was conducted. The results, such as eigenfrequencies, obtained by the proposed transducer agreed favorably with theoretical results.

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References

  1. Drew, S. J. and Stone, B. J., 2005, 'Torsional Damping Measurement for a Gear Box' , Mechanical Systems and Signal Processing, Vol. 19, No.5, pp. 1096 - 1106 https://doi.org/10.1016/j.ymssp.2004.07.002
  2. Sasida, T. and Kenio, T, 1993, An Introduction to Ultrasonic Motors, Oxford University Press, Oxford
  3. Kim, J. O. and Kwon, O. S., 2003, 'Vibration Characteristics of Piezoelectric Torsional Transducers' , Journal of Sound and Vibration, Vol. 264, No. 2, pp. 453 - 473 https://doi.org/10.1016/S0022-460X(02)01234-8
  4. Kim, J. H., Kim, J. H. and Chung, D. D., 2005, 'Research for Stepping Motor Using Piezoelectric Torsional Actuator' , Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 15, No. 4, pp. 499 - 505 https://doi.org/10.5050/KSNVN.2005.15.4.499
  5. http://www.corad.com
  6. Simpson, H. M. and Pearson, J., 1979, 'Simple Apparatus for Measuring the Dynamic Shear Modulus of Cylindrical Specimens' , Reviews in Scientific Instrumentation, Vol. 50, No. 4, pp. 418 - 420 https://doi.org/10.1063/1.1135842
  7. Zhu, W. D. and Emory, B. H., 2005, 'On a Simple Impact Test Method for Accurate Measurement of Material Properties' , Journal of Sound and Vibration, Vol. 287, pp. 637 - 643 https://doi.org/10.1016/j.jsv.2005.02.016
  8. Borzorth, R. M., 1993, Ferromagnetism, Piscataway, N. J.: IEEE Press
  9. Jiles, D. C., 1995, Introduction to Magnetism and Magnetic Materials, Chapman & Hall, London
  10. Kwun, H. and Bartels, K. A. 1995, 'Experimental Observation of Wave Dispersion in Cylindrical Shells via Time-frequency Analysis' , J. Acoust. Soc. Am., Vol. 97, No. 6, pp. 3905-3907 https://doi.org/10.1121/1.412995
  11. Kim, Y. Y., Park, C. I., Cho, S. H. and Han, S. W., 2005, . 'Torsional Wave Experiments with a New . Magnetostrictive Configuration' , J. Acoust. Soc. Am, Vol. 117, No. 6, pp. 3459 - 3468 https://doi.org/10.1121/1.1904304
  12. Cho, S. H., Park, C. I. and Kim, Y. Y., 2005, 'The Effects of the Orientation of the Magnetostrictive Nickel strip on the Torsional Wave Transduction Efficiency in Cylindrical Waveguides' , Applied Physics Letters, 86, pp. 244101 - 244103 https://doi.org/10.1063/1.1948534
  13. Griffiths, D. J., 1999, 'Introduction to Electrodynamics', 3rd edn, Prentice Hall International, Inc., Upper Saddle River, New Jersey
  14. Meirovitch, L., 1986, 'Elements of Vibration Analysis', 2nd ed., McGraw-Hill, Singapore
  15. Thompson, R. B., 1978, 'Generation of Horizontally Polarized Shear Waves In Ferromagnetic Materials Using Magnetostrictively Coupled Meander-coil Electromagnetic Transducers' , Applied Physics Letters, Vol. 34, No. 2, pp. 175-177
  16. Kim, Y. Y., Cho, S. H., Han, S. W. and Park, C. I., 2005, 'Apparatus and Method for Generating and Sensing Torsional Vibrations Using Magnetostriction' , Patent Pending to Korea, S. N. 10-2005-0111033
  17. http://www.cartech.com
  18. Ewins, D. J., 1984, 'Modal Testing: Theory and Practice' , Research Studies Press, Letchworth