Study on Analysis of Evanescent Waves Generating the Strong End Axial Vibration of a Finite Cylindrical Shell

유한 원통셸의 큰 끝단 종진동을 발생시키는 감쇠파에 대한 분석 연구

  • Received : 2011.08.09
  • Accepted : 2011.09.19
  • Published : 2011.10.31


Propagating waves (flexural, longitudinal and shear waves) travelling with constant amplitudes and evanescent waves decaying exponentially are generated on a cylindrical shell. Evanescent waves are generally generated in the vicinity of an vibration excitation point and near ends of the shell. But the evanescent waves can generates strong axial vibration at the ends of the cylindrical shell. The strong end axial vibration due to those evanescent waves has been observed in an author's previous paper dealing with measurements of the in-plane axial vibration of a finite cylindrical shell. In this paper the strong end axial vibration due to the evanescent waves has been theoretically analyzed. In order to analyze the vibration of the cylindrical shell, wave propagation approach has been implemented. Comparison between theoretical and experimental results for the axial vibration of the shell showed that the strong evanescent wave can be generated due to mode conversion (conversion from flexural wave to evanescent wave) at the ends of cylindrical shell. It also showed that the evanescent wave can generate the strong axial vibration near the ends of the cylindrical shell and that it can have effect even on 1/3 of the total length of the shell.


Finite cylindrical shell;Propagating waves;Evanescent waves;Strong end axial vibration;Mode conversion


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