Experimental vibrodiagnostics of crack and modal analysis of its finite-element model

Authors: Aleksandrov Ya.V.
Published in issue: #2(43)/2020
DOI: 10.18698/2541-8009-2020-2-578
Category: Mechanical Engineering and Machine Science | Chapter: Machine Science, Drive Systems, and Machine Components
Keywords: vibration diagnostics of cracks, fatigue tests, test bench, non-destructive testing methods, natural frequencies, amplitude-frequency characteristics, spectral analysis, finite element modeling
Published: 13.02.2020

A stand for fatigue testing has been developed. Experimental tests are carried out of the development of a defect in the form of a crack in the plate. During the tests, temporary signals were taken from vibration sensors mounted on the plate and the base of the rack, the linear relationship of the received signals was proved, the results were processed by the method of spectral analysis. As a result, the amplitude-frequency spectrum of the plate under study was obtained. Using the finite element method, a model of the object is created. A modal analysis of the constructed model is carried out, theoretical and experimental research results are compared. The conclusion is drawn about the possibility of using the constructed diagnostic model in practice.

References

[1] Andrienko L.A., Brykin K.I Experimental research of fatigue crack development in a rectangular plate. Inzhenernyy zhurnal: nauka i innovatsii [Engineering Journal: Science and Innovation], 2017, no. 10. DOI: http://dx.doi.org/10.18698/2308-6033-2017-10-1683 (in Russ.).

[2] Barau N.I., Kulish E. Vibratsionnaya diagnostika protivoopolznevykh zashchitnykh sooruzheniy [Vibration diagnostics of landslide protection structures]. Kiev, Tsentr uchebnoy literatury Publ., 2017 (in Russ.).

[3] Bovsunovskiy O.A. Finite element model for simulation of vibrations of a beamwith a closing crack. Problemy prochnosti [Problems of Strength], 2008, no. 5, pp. 114–120 (in Russ.).

[4] Bovsunovskiy A.P. Estimation of effectiveness of vibration diagnostics of damage of turbines shafting. Vіbratsії v tekhnіtsі ta tekhnologіyakh, 2016, no. 2, pp. 54–65 (in Russ.).

[5] Berns V.A., Lysenko E.A., Dolgopolov A.V., et al. Experience of aircraft defects monitoring by vibration parameters. Izvestiya Samarskogo nauchnogo tsentra RAN [Izvestia RAS SamSC], 2016, no. 4, pp. 86–96 (in Russ.).

[6] Zhukov R.V. Review on some ISO/TC-108 standards in field of machine equipment diagnostics. Kontrol'. Diagnostika [Testing. Diagnostics], 2004, no. 12, pp. 61–66 (in Russ.).

[7] Klyuev V.V., ed. Nerazrushayushchiy kontrol'. T. 7. Kn. 2. Vibrodiagnostika [Nondestructive control. Vol. 7. P. 2. Vibration diagnostics]. Moscow, Mashinostroenie Publ., 2005 (in Russ.).

[8] Kostyukov V.N., Naumenko A.P. Osnovy vibroakusticheskoy diagnostiki i monitoringa mashin [Fundamentals of vibroacoustic diagnostics and monitoring of machines]. Omsk, Izd-vo OmGTU Publ., 2011 (in Russ.).

[9] Postnov V.A. Determination of elastic system damages by mathematical evaluation of frequency spectra, derived from experiment. Izvestiya RAN. MTT, 2000, no. 6, pp. 155–160 (in Russ.).

[10] Kositsyn A.V. Method of the vibrating diagnostics of defects of elastic designs on the basis of the analysis own forms of fluctuations. Pribory i metody izmereniy [Devices and methods of measurements], 2011, no. 2, pp. 129–135 (in Russ.).