Operational vibration shape measurement of piezoceramic disc actuator using digital image correlation vibrometry with a single reference signal

Jones, I.A.; Jabbal, M.; Buss, T.M.

Abstract

© Published under licence by IOP Publishing Ltd. This paper describes the enhancement and application of a digital image correlation (DIC) vibrometry method which avoids the need for high speed cameras. The underlying technique, described earlier by members of the present team (Warburton et al, Exp. Mech. 56(7) 1219-1230), was used to measure the operational vibration shapes of a piezoceramic synthetic jet actuator disc. Following the method previously reported, pairs of images were captured using the Dantec Q-400 hardware at a frequency of 0.25 Hz, with synchronised flash illumination but not synchronised with the excitation signal, which was captured simultaneously with each image pair. The images were processed using the Dantec Istra4D software and were post-processed largely as described by Warburton in order to obtain amplitude and phase maps for each frequency, but instead of using an externally-generated quadrature signal as a reference, an alternative reference was taken from the median displacement over an area of the specimen, in order to resolve the phase position of each image pair. Although the raw measured deflected shapes were generally dominated by the main dishing mode of the actuator, alternative higher order shapes such as asymmetric and trefoil shapes occurred in quadrature with these dishing-mode deflections.

Citation

Jones, I., Jabbal, M., & Buss, T. (2018). Operational vibration shape measurement of piezoceramic disc actuator using digital image correlation vibrometry with a single reference signal. Journal of Physics: Conference Series, 1106, 1-8. https://doi.org/10.1088/1742-6596/1106/1/012032

• Journal Article Type: Article
• Conference Name: Modern Practice in Stress and Vibration Analysis
• Acceptance Date: Nov 5, 2018
• Online Publication Date: Nov 5, 2018
• Publication Date: 2018-10
• Deposit Date: Jan 8, 2019
• Publicly Available Date: Jan 9, 2019
• Journal: Journal of Physics: Conference Series
• Print ISSN: 1742-6588
• Electronic ISSN: 1742-6596
• Publisher: IOP Publishing
• Peer Reviewed: Peer Reviewed
• Volume: 1106
• Article Number: 012032
• Pages: 1-8
• DOI: https://doi.org/10.1088/1742-6596/1106/1/012032
• Keywords: Vibration analysis; digital image correlation; vibrometry
• Public URL: https://nottingham-repository.worktribe.com/output/1452821
• Publisher URL: http://iopscience.iop.org/article/10.1088/1742-6596/1106/1/012032/meta
• Additional Information: conference paper was put forward to publishers for publication on 5 October by conference organiser and no official notification of acceptance was received until told of publication on 6 November 2018.
• Contract Date: Jan 9, 2019