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|Title: ||Analysis of the industrial application of electronic speckle pattern shearing interferometry|
|Authors: ||Ibrahim, Jamal S.|
|Issue Date: ||2006|
|Publisher: ||© Jamal Sheikh Ibrahim|
|Abstract: ||Dunlop Aerospace Braking Systems Plc. (DABS) is an international leading
aircraft wheel and brake manufacturer. DABS had two wheel units, which
were causing qualification problems in terms of fatigue cracking.
Loughborough University (LU) proposed a novel robust non-contact, and non-destructive
optical Shearographic Sensor System (SSS) for measuring and studying aircraft wheel
deformation and behaviour when subjected to large static structural loading, with the aim
i) Develop a novel robust optical sensor system for routine industrial use.
ii) Demonstrate the novel and routine implementation for large scale structural
iii) Identify high deformation concentration areas on aircraft wheel structures.
iv) Provide routine quantitative data to DABS.
v) Develop the novel understanding of error propagation, resolution and repeatability
of the interferometer design.
A series of laboratory experiments were conducted to demonstrate the functionality,
repeatability, and reliability of the instrument to produce valid deformation data in a
controlled environment in the optical metrology laboratory at LU. The SSS produced
valid high quality deformation data using a Square Clamped Plate (SCP). The data was
calibrated and correlated using a Linear Variable Differential Transducer (LVDT) system.
The repeatability and reliability tests showed a high repeatability range of the SSS in the
controlled environment of (5.95x10-8m) in the case of 10mm Horizontal lateral shear
with Collimated laser illumination (10HC) and (1.22x10-7m) in the case of 10mm
Vertical lateral shear with Collimated laser illumination (10VC).
This accelerated the transfer of the SSS into the industrial environment at DABS, where
heavy testing machineries operate routinely, which generated additional error and
variation sources to the data produced by the SSS. A series of deflation/ inflation
pressure and static structural load tests were completed on Boeing757 and BAe 146 wheel.
The results showed that the data quality was sufficiently good to allow DABS to validate the FE model of the wheel, in spite of the surrounding uncontrolled and disturbing
environment. Further repeatability and reliability tests were completed on the BAel46
wheel. This was to identify and discuss the engineering reality of the repeatability,
reproducibility, and accuracy of the SSS, The results showed that the SSS achieved a
better repeatability range in the laboratory in comparison to the industrial workplace at
DABS, whichwas (1.60xl0-5m) and (1.08xl0-5m) forthe same shearing directions.
As a result, DABS was provided with large amount of numerical data from the Boeing757
and the BAe142 wheels, in partial derivative and displacement format, ready for FE
model validation. Commercial exploitation of the SSS into other industrial sectors and for
various applications was completed via Laser Optical Engineering Ltd.|
|Description: ||A Doctoral Thesis. Submitted in partial fulfillment of the requirements for the award of Doctor of Philosophy of Loughborough University.|
|Appears in Collections:||PhD Theses (Mechanical, Electrical and Manufacturing Engineering)|
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