Increasing the Frequency Resolution when Measuring Vibrations of Rotating Bodies with Fixed Beam Laser Vibrometry

V. V. Artelnyi; Артельный В. В.; A. A. Rodionov; Родионов А. А.; A. V. Stulenkov; Стуленков А. В.

doi:10.31857/S0320791922600214

Increasing the Frequency Resolution when Measuring Vibrations of Rotating Bodies with Fixed Beam Laser Vibrometry

Authors: Artelnyi V.V.¹, Rodionov A.A.¹, Stulenkov A.V.¹
Affiliations:
1. Institute of Applied Physics, Russian Academy of Sciences, 603155, Nizhny Novgorod, Russia
Issue: Vol 69, No 3 (2023)
Pages: 351-356
Section: АКУСТИЧЕСКАЯ ЭКОЛОГИЯ. ШУМЫ И ВИБРАЦИЯ
URL: https://journal-vniispk.ru/0320-7919/article/view/134444
DOI: https://doi.org/10.31857/S0320791922600214
EDN: https://elibrary.ru/YJAAUJ
ID: 134444

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Abstract
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Abstract

Laser Doppler vibrometry is actively used in experimental studies because of its noncontact measurement technique. When using a stationary laser to measure the vibrations of rotating bodies and Fourier transform to process the results of such measurements, a problem arises, associated with a decrease in the frequency resolution of the spectra with increasing rotation rate of the body. As a result, at sufficiently high rotation rates, closely spaced discrete components may cease to be resolved. This paper proposes a method for solving such a problem using the least squares method. The operability of this processing method has been demonstrated on experimental data.

Keywords

laser vibrometry, frequency resolution, least squares method, measurement of rotating bodies

References

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