Inorganic Materials

, Volume 54, Issue 15, pp 1537–1542 | Cite as

Evaluation of the Possibility of Flaw Detection in Turbine Generator Stator According to Spectrum of Vibroacoustic Signal

  • A. L. NazolinEmail author


A method for the evaluation of vibration acceleration spectra of the components of an operating turbine generator stator with loosening defects according to the results of simulation modeling is described. The procedure is developed and the experimental determination of frequency characteristics of the accelerance of a powerful turbine generator stator design from the loosening defect location to stator housing is given. The procedure is intended for the turbine generators of power plants on overhaul and/or testing facilities of manufacturing plants and employs impact excitation using an exciter that is not attached to the structure. The configuration of measuring facilities is given and the measurement error of the frequency characteristics of the calibrating unit is evaluated. The frequency characteristics recorded from four stators of turbine generators of TVV-320-2 type with different technical positions of mounting attachments and service lives are compared. The parameters of the check on measurements are evaluated. The possibility of the evaluation of the frequency characteristics of stator on a turbine generator of each type is shown. The installation diagram of sensors on the stator housing, which provides the defect location with the exactness of up to the sector of circumference of the stator with the central angle of 90°, is rationalized. The estimates of the frequency characteristics of the stator can be used for simulation modeling of vibroacoustic oscillations of the operating turbine generator stator housing with loosening defects. The aim of this work is to evaluate the possibility of the stator defect location and determine spectral diagnostic properties of faults. Drawbacks of the instantaneous impact model are shown and the examples and recommendations are given on the generation of dynamic models of the defects of stator.


stator design loosening defects impact tests force signal response signal frequency characteristics of accelerance check on measurements dynamic stiffness dynamic compliance diagnostic properties defect location 



  1. 1.
    Titov, V.V., Khutoretskii, G.M., Zagorodnaya, G.A., et al., Turbogeneratory. Raschet i konstruktsiya (Turbine-Generators: Calculation and Design), Leningrad: Energiya, 1967.Google Scholar
  2. 2.
    Fridman, V.M., Shkoda, G.V., and Shkol’nik, V.E., Turbine generator set stator oscillations caused associated with rotating magnetic field, in Elektrosila (Electric Power), Leningrad: Energiya, 1974, no. 30, pp. 17–21.Google Scholar
  3. 3.
    Batuev, G.S., Golubkov, Yu.V., Efremov, A.K., et al., Inzhenernye metody issledovaniya udarnykh protsessov (Engineering Studies of Impact Processes), Moscow: Mashinostroenie, 1977.Google Scholar
  4. 4.
    Tsvetkov, V.A., Diagnostika moshchnykh generatorov (Diagnostics of Powerful Generators), Moscow: ENAS, 1995.Google Scholar
  5. 5.
    Samorodov, Yu.N., Defekty generatorov (Defects of Generators), Moscow: Energeticheskie Tekhnologii, 2005.Google Scholar
  6. 6.
    GOST (State Standard) ISO 7626-5-99: Vibration and shock.Experimental determination of mechanical mobility. Part 5. Measurements using impact excitation with an exciter which is not attached to the structure, Moscow: Izd. Standartov, 2000.Google Scholar
  7. 7.
    Bendat, J.S. and Piersol, A.G., Random Data: Analysis and Measurement Procedures, New York: Wiley, 1971.Google Scholar
  8. 8.
    GOST (State Standard) ISO 5348-99: Mechanical vibration and shock. Mechanical mounting of accelerometers, Moscow: Izd. standartov, 2000.Google Scholar
  9. 9.
    Genkin, M.D. and Sokolova, A.G., Vibroakusticheskaya diagnostika mashin i mekhanizmov (Vibroacoustic Diagnostics of Machines and Mechanisms), Moscow: Mashinostroenie, 1987.Google Scholar
  10. 10.
    Nazolin, A.L. and Polyakov, V.I., Research of vibroimpact regimes of motion in the “rib–electric machine core” system, Elektrichestvo, 2007, no. 6, pp. 26–30.Google Scholar
  11. 11.
    Nazolin, A.L., Mathematical model of vibroimpact in the end stack of a sheet core of electric machine, Probl. Mashinostr. Nadezhnosti Mash., 2005, no. 2, pp. 10–17.Google Scholar
  12. 12.
    Nazolin, A.L., The dynamic diagnostic model of the mount of the winding in slot of the stator core of a powerful turbo-generator, Nauka Obraz., 2012, no. 2, p. 8.Google Scholar
  13. 13.
    Morozov, A.N. and Nazolin, A.L., Imitating modeling of vibroacoustic oscillations of the stator turbo-generator housing with defect of easing of stator suspension, Nelineinyi Mir, 2009, no. 7, pp. 556–562.Google Scholar

Copyright information

© Pleiades Publishing, Inc. 2018

Authors and Affiliations

  1. 1.Bauman Moscow State Technical UniversityMoscowRussia

Personalised recommendations