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physical environments of aerospace applications.
This 3 year project has an common methodology
for data collection and transfer to meet the diverse
needs of the consortium. Benefits include reduced
weight and cost of testing, enhanced maintenance
and faster ‘entry into service’.
In order to evaluate the performance and cost
benefits of embedded and remote testing in a real
life product context, two generations of the same
device, a Linux based home media server, were
designed and built. One with traditional electronics
with conventional production and testing plan and
another loaded with several embedded test Figure 4a) The
capabilities. The following subjects were developed simulation setup for
during the project: through mode.
Prototype with embedded test techniques: 4b) The change in
xrhombus Embedded test structures including RF test output with various
xrhombus Automatic self testing damage
xrhombus Implemented BIST methods
xrhombus Monitoring cell for proactive fault detection
xrhombus Wireless test access
xrhombus Controlled and forehand simulated defects
Prototype with conventional design for:
xrhombus Test structure impact on performance
xrhombus Comparing the testing processes the performance and cost of embedded life cycle
testing of future electrical products.
Testing through network with:
xrhombus Remote service centre or control room Wiring health monitoring
xrhombus Testing access and testing commands A number of partners of the design cluster are
xrhombus Test data files and post processing developing a suite of sensors as part of a HUMS
xrhombus Preliminary tool for MTTF prediction system demonstrator specifically for aerospace
wiring. These sensors will monitor key
The hardware of the REMTEST device mimics environmental parameters (temperature, humidity,
well the common structure of a modern IT strain and current transients) which affect and / or
product, thus making the findings of the project indicate the condition of wiring. Access to a
highly relevant to modern testing of electrical historic record of such data will enable prognostic
products. Therefore, the on-going analysis of the health management, as well as failure detection.
material created during the project will produce In turn, enabling reduced maintenance and higher
valuable information on the pros and cons of both service confidence over an extended operating life.
Further aspects of diagnostic and prognostic
technologies for aircraft wiring integrity are
research areas pursued in several projects. Partial
discharge analysis has the potential to be an early
warning indicator of wiring failure since it is very
sensitive to the onset of dielectric failures
associated with arcing. Emerging nano and micro
technology based complete arrays of passive
sensors to measure current, humidity, temperature,
proximity etc. can be fully or partially embedded
into an electrical wiring and integrity system.
Systems for Intelligent decisions using various
methods like model based diagnosis, wavelet
neural network, cross correlation, and statistical
analysis for faulty feature extraction combined REFERENCES:
with sensory data and either support vector [1] S. Neyon, A.
machines or artificial intelligence based classifiers Richardson and H. Van
Figure 3 RH sensor mounted to TO-type can provide diagnosis and prognosis. Knowledge Heren, NEXUS report.
header and contacted with wire bonding based CBM systems in combination with Expert workshops in
ready for the test measurements. Inset: SEM quantitative sensory data information can greatly structural health
image of the porous alumina sensing layer reduce the computational burden. monitoring, Oct. 2008.
December 2008 / January 2009 www.micronanosystems.info
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