Experimental analysis of forced nonlinear vibrations of beams with breathing cracks

Authors

  • О. Ф. Полищук A.N. Podgorny Institute for Mechanical Engineering Problems of NAS of Ukraine, Ukraine
  • К. В. Аврамов A.N. Podgorny Institute for Mechanical Engineering Problems of NAS of Ukraine, Ukraine
  • К. Б. Мягкохлеб A.N. Podgorny Institute for Mechanical Engineering Problems of NAS of Ukraine, Ukraine

Keywords:

forced nonlinear vibrations, beam, crack

Abstract

The cracks are one of the most common reasons of the structure damage leading to accidents. In order to avoid these damages, it is very important to reveal the cracks in time. The aim of the research, which is treated in this paper, is experimental determination of the diagnostic criterion of the crack appearance. The formation of the breathing crack is diagnosed according to the parameters of the nonlinear vibrations, which are sensitive to the cracks breathing. The parameters of the nonlinear vibrations can be used as diagnostic criterion of the crack formation. The forced vibrations experimental data of the beams with big depth cracks are considered. The kinematic excitation of the beam is reproduced by the shaker. The data of the vibrations analysis are shown on the frequency responses. The Fourier analysis of the periodic vibrations is carried out. The vibration hysteresis is analyzed experimentally. The data of the Fourier analysis are shown on the frequency responses. The amplitudes of the first and the third harmonics of the Fourier series are shown. The quenching is indicated only for the amplitudes of the first harmonic. The amplitudes of the second and third harmonics are shown on the separated figure

Author Biographies

О. Ф. Полищук, A.N. Podgorny Institute for Mechanical Engineering Problems of NAS of Ukraine

PhD

К. В. Аврамов, A.N. Podgorny Institute for Mechanical Engineering Problems of NAS of Ukraine

Doctor of Technical Sciences

К. Б. Мягкохлеб, A.N. Podgorny Institute for Mechanical Engineering Problems of NAS of Ukraine

PhD

References

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Published

2017-06-30

Issue

Vol. 20 No. 2 (2017)

Section

Dynamics and Strength of Machines

License

Copyright (c) 2017 О. Ф. Полищук, К. В. Аврамов, К. Б. Мягкохлеб

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