Journal ArticleDOI
Modal vibration analysis of a metal plate by using a laser vibrometer and the POD method
TLDR
In this article, proper orthogonal decomposition (POD) was applied to the modal vibration analysis of a metal plate, which was subject to vibrations with an electrodynamical shaker in a range of frequencies from 100 to 5000 Hz.Abstract:
The proper orthogonal decomposition (POD), also known as Karhunen–Loeve expansion, is applied to the modal vibration analysis of a metal plate. The metal plate was subject to vibrations with an electrodynamical shaker in a range of frequencies from 100 to 5000 Hz. The data were obtained from the measurements with a laser vibrometer. The plate vibration measurements were used to calculate the eigenfunctions and the eigenvalues. It was found that a large fraction of the total energy of the vibrations is contained within the first four POD modes. The essential features of the vibrations are thus described by only the first four eigenfunctions.read more
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Patent
Planar lighting device
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Journal ArticleDOI
Surface-enhanced circular dichroism spectroscopy mediated by nonchiral nanoantennas
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Tying knots in light fields
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Book ChapterDOI
Security Based on Physical Unclonability and Disorder
TL;DR: This chapter provides a classification for past and ongoing work in physical disorder based security alongside with security analyses and implementation examples and outlines some open problems and future research opportunities.
Journal ArticleDOI
Measuring protein concentration with entangled photons
Andrea Crespi,Mirko Lobino,Jonathan C. F. Matthews,Alberto Politi,Chris R. Neal,Roberta Ramponi,Roberto Osellame,Jeremy L. O'Brien +7 more
TL;DR: In this paper, the concentration of a blood protein in an aqueous buffer solution was measured using an opto-fluidic device that couples a waveguide interferometer with a micro-fluideic channel.
References
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Journal ArticleDOI
The Proper Orthogonal Decomposition in the Analysis of Turbulent Flows
TL;DR: The Navier-Stokes equations are well-known to be a good model for turbulence as discussed by the authors, and the results of well over a century of increasingly sophisticated experiments are available at our disposal.
Journal ArticleDOI
On the physical interpretation of proper orthogonal modes in vibrations
Brian F. Feeny,R. V. Kappagantu +1 more
TL;DR: In this article, the authors relate the proper orthogonal modes, as applied in discrete vibration systems, to normal modes of vibration in systems with a known mass matrix in the case of undamped free vibration.
Journal ArticleDOI
Modal testing using a scanning laser doppler vibrometer
A.B. Stanbridge,David J. Ewins +1 more
TL;DR: In this article, a number of vibration mode shape measurement techniques are described in which the measurement point of a laser Doppler vibrometer (LDV) is continuously scanned over the surface of a sinusoidally excited structure.
Book ChapterDOI
Coherent Structures in the Axisymmetric Turbulent Jet Mixing Layer
TL;DR: In this article, a shot-noise decomposition is used to organize Fourier modes into coherent features, where the eigenfunctions are the harmonic ones and the coherent features are impossible to identify.