10.14489/td.2017.07.pp.026-032

2017, 07July

DOI: 10.14489/td.2017.07.pp.026-032

Korolev A. I.
A PHOTOGRAPHIC METHOD OF 3D OSCILLATIONS ANALYSIS IN VIBRATION TESTING
(pp. 26-32)

Abstract. An optical method is proposed to analyze three-dimensional macroscopic oscillations in vibration diagnostics based on photographing. Trajectories of points on the surface of analyzed object under harmonic oscillations are Lissajous knots with distorted shapes and blur. Projections of these curves on the image planes of interest can be detected using photographing. Further it is possible to analyze amplitude, frequency and phase of the oscillations by obtained frames. The article describes a practical implementation of the method using lightning arrester samples provided for vibration testing by the company NPO Streamer. Oscillations were excited by the vibration shaker in vertical direction. Exciting frequency range is 5…100 Hz. Tracks of glossy marker points were observed using camera remote-controlling from PC. The tracks on photos are bright vertical line segments in the absence of transverse components of vibration acceleration. More complex track curves take place in the presence of the components, especially in resonance frequency band. There were registered ellipses, circles, figureeight loops, and their distorted variations. The analysis of track projections was carried out using wellknown theory. Additional shooting in transverse direction is needed to get 3D trajectories. Even more complex track curves may be obtained through 3D modelling.

Keywords: vibration testing, Lissajous knots, photographic method, image blur.

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A. I. Korolev (Russian State Scientific Center for Robotics and Technical Cybernetics (RTC), St. Peterburg, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

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