Vibration Measurement and Data Analysis of a Spinning Shaft Using a Camera-Based Motion Analysis System

Abstract:

This paper presents the use of a camera-based 3D motion analysis system for non-contact dynamic testing of a highly flexible spinning vertical shaft. The camera system uses high-resolution CMOS cameras to measure instant geometry of the shaft when visible red digital LED strobes are synchronized to work at a speed between 0.1 to 2000 frames per second. Dynamically deformed geometries are obtained by tracing the three-dimensional instantaneous coordinates of markers adhered to the shaft’s outside surface and triangulation techniques for identifying markers’ coordinates. Numerical simulation and experimental results show that the use of camera-based motion analysis systems is feasible and accurate enough for dynamic experiments. For dynamics characterization, we present the use of the Hilbert-Huang transform (HHT) for time frequency analysis of measured dynamic responses. The results show that the third-mode vibration has a cubic nonlinearity.

• Periodical: Applied Mechanics and Materials (Volumes 29-32)
• Pages: 203-208
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.29-32.203
• Online since: August 2010
• Authors: Xin Qian, Guo Chang Lin, Xing Wen Du
• Keywords: Camera-Based Noncontact Measurement, Hilbert-Huang Transform (HHT), Spinning Shaft

References

[1] H. Fang and M.C. Lou, Analytical Characterization of Space Inflatable Structures - An Overview, AIAA Paper 99-1272, (1999).

[2] C.H.M. Jenkins (editor), Recent Advances in Gossamer Spacecraft, AIAA, Reston, Virginia, USA, (2006).

[3] P.F. Pai, Highly Flexible Structures: Modeling, Computation and Experimentation, AIAA, Reston, Virginia, USA, (2007).

[4] N.E. Huang and N.O. Attoh-Okine (editors), The Hilbert-Huang Transform in Engineering, CRC Press, Boca Raton, FL, USA, (2005).

[5] N.E. Huang and S.S. Shen (editors), Hilbert-Huang Transform and Its Applications, World Scientific, Hackensack, New Jersey, USA, (2005).

[6] A.H. Nayfeh and D.T. Mook, �onlinear Oscillations, Wiley-Interscience, New York, USA, (1979).