Imperial College London
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ProfessorMichaelLowe

Faculty of Engineering, Department of Mechanical Engineering

Head of Department of Mechanical Engineering
 
 
 
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Contact

 

+44 (0)20 7594 7000m.lowe Website

 
 
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Assistant

 

Ms Nina Hancock +44 (0)20 7594 7068

 
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Location

 

577DCity and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Corcoran:2020:10.1109/tuffc.2019.2960108,
author = {Corcoran, J and Leinov, E and Jeketo, A and Lowe, MJS},
doi = {10.1109/tuffc.2019.2960108},
journal = {IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control},
pages = {997--1008},
title = {A guided wave inspection technique for wedge features},
url = {http://dx.doi.org/10.1109/tuffc.2019.2960108},
volume = {67},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Numerous engineering components feature prismatic wedge-like structures that require Non-destructive Evaluation (NDE) in order to ensure functionality or safety. This paper focuses on the inspection of the wedge-like seal fins of a jet engine drum, though the capabilities presented will be generic. It is proposed that anti-symmetric flexural edge modes, feature guided waves localised to the wedge tips, may be used for defect detection. Although analytical solutions exist that characterise the ultrasonic behaviour of ideal wedges, in practise real wedges will be irregular (containing for example truncated tips, are built onto an associated structure or have non straight edges) and therefore generic methodologies are required to characterise wave behaviour in non-ideal wedges. This paper uses a semi-analytical finite element (SAFE) methodology to characterise guided waves in wedge-like features with irregular cross-sections to assess their suitability for NDE inspection and compare them to edge modes in ideal wedges. The science and methodologies required in this paper are necessary to select an appropriate operating frequency for the particular application at hand. Additionally, this paper addresses the practical challenge of excitation and detection of flexural edge modes by presenting a piezoelectric based dry-coupled transducer system suitable for pulse-echo operation. The paper therefore presents the scientific basis required for industrial exploitation, together with the practical tools that facilitate use. The study concludes with the experimental demonstration of the edge wave based inspection of a seal fin, achieving a signal-to-noise ratio of 28 dB from a 0.75 mm radial tip defect.
AU  - Corcoran,J
AU  - Leinov,E
AU  - Jeketo,A
AU  - Lowe,MJS
DO  - 10.1109/tuffc.2019.2960108
EP  - 1008
PY  - 2020///
SN  - 0885-3010
SP  - 997
TI  - A guided wave inspection technique for wedge features
T2  - IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
UR  - http://dx.doi.org/10.1109/tuffc.2019.2960108
UR  - https://ieeexplore.ieee.org/document/8933468
UR  - http://hdl.handle.net/10044/1/77433
VL  - 67
ER  -
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