Power flow estimation using pulsed ESPI

Paulo S. L. Alves; Jose Roberto de F. Arruda; Lothar Gaul; Stefan Hurlebaus

doi:10.1117/12.386729

22 May 2000 Power flow estimation using pulsed ESPI

Paulo S. L. Alves, Jose Roberto de F. Arruda, Lothar Gaul, Stefan Hurlebaus

Proceedings Volume 4072, Fourth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (2000) https://doi.org/10.1117/12.386729
Event: 4th International Conference on Vibration Measurement by Laser Techniques, 2000, Ancona, Italy

Abstract

Measurements performed using a double pulse ESPI (Electronic Speckle Pattern Interferometry) are used to estimate the power flow maps in a square plate excited harmonically. The pulse ESPI was equipped with one camera providing no information about the phase of the measured displacement field. A procedure based on the solution of a system of transcendental equations which corresponds to two measurements with a known time delay is used to determine the magnitude and phase. In order to spatially smooth the operational modes and reduce the noise spikes, a smoothing technique and a median filter are used, respectively. The active power flow is estimated for two frequencies. The reactive power flow due to the bending moments, twisting moments and shear forces are obtained separately. A finite element model based on the theory of thin plates is used for qualitative comparison of the reactive power flow maps.

Citation Download Citation

Paulo S. L. Alves, Jose Roberto de F. Arruda, Lothar Gaul, and Stefan Hurlebaus "Power flow estimation using pulsed ESPI", Proc. SPIE 4072, Fourth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 May 2000); https://doi.org/10.1117/12.386729

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