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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Neild, Simon
University of Bristol
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (6/6 displayed)
- 2018Slender-Wing Beam Reduction Method for Gradient-Based Aeroelastic Design Optimizationcitations
- 2013Experimental investigation into a passive vibration isolator incorporating a bistable composite platecitations
- 2009Measurement of the ultrasonic nonlinearity of kissing bonds in adhesive jointscitations
- 2007Nonlinear dynamics of a bi-stable composite laminate plate with applications to adaptive structures
- 2006Global Crack Detection using Bispectral Analysis
- 2006Global crack detection for aircraft monitoring using bispectral analysis
Places of action
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document
Global Crack Detection using Bispectral Analysis
Abstract
A global non-destructive testing technique for detecting cracks in engineering parts has been developed. The technique uses the bispectrum to analyse the mixing of two ultrasonic sinusoidal waves in a sample. The bispectrum’s insensitivity to noise allows more sensitive detection of mixing signals than the power spectrum. Two sinusoidal signals are generated by signal generators, amplified and applied to a piezo-ceramic disk bonded to a sample. The sample is excited at very-high-order modes of vibration. The response of the sample is measured by a second piezoceramic disk and the received signal analysed using the bispectrum signalprocessing technique. Frequency mixing occurs as a result of the non-linear behaviour of cracks in the structure. Experiments with fatigue-cracked steel beams demonstrate that fatigue cracks produce a strong mixing effect and that the bispectrum signal relating to the frequency mixing is sensitive to the length of the crack; allowing the quantification of the crack length. Progress is being made in applying the technique to more practical situations: the sensitivity of the technique to transducer position and the input signal parameters (frequency and amplitude) is quantified experimentally.