Free vibration of a cracked double-beam carrying a concentrated mass

Authors

  • Nguyen Viet Khoa Institute of Mechanics, Vietnam Academy of Science and Technology, Hanoi
  • Nguyen Van Quang Institute of Mechanics, Vietnam Academy of Science and Technology, Hanoi

DOI:

https://doi.org/10.15625/0866-7136/7118

Keywords:

Natural frequency, mode shape, concentrated mass, crack, double-beam

Abstract

This paper presents the free vibration of a cracked double-beam carrying a concentrated mass located at an arbitrary position. The double-beam consisting of two different simply supported beams connected by an elastic medium is modelled by using finite element method. The influence of the concentrated mass on the frequencies and mode shapes is investigated. The relationship between the natural frequency and the location of concentrated mass is established and related to the mode shapes. The numerical simulations show that when there is a crack, the frequency of the double-beam changes sharply when the concentrated mass is located close to the crack position. This sharp change can be amplified by wavelet transform and this is useful for crack detection. The crack location can be determined by the location of peaks in the wavelet transform of the relationship between frequency and mass location.

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Published

20-12-2016

How to Cite

Khoa, N. V., & Quang, N. V. (2016). Free vibration of a cracked double-beam carrying a concentrated mass. Vietnam Journal of Mechanics, 38(4), 279–293. https://doi.org/10.15625/0866-7136/7118

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Section

Articles