Aeronautics
:
Session
chair:Michel
Meunier, Ecole Polytechnique de Montreal, Canada
.
Speakers:
Gerhard
Krotz, EADS-LV, Germany, Europe
MEMS for Aircraft Applications in Europe
.
Patrice Masson, Sherbrooke University, Canada
MEMS for Engines
Abstract
This presentation provides an overview of a project aiming at reducing
the high costs associated with periodic prescribed inspections of aircraft
structures by the development of an in situ structural health monitoring
(SHM) system. The aerospace industry has shown a great interest for a
device that would avoid the need to dismantle some parts of the aircraft
for the periodic inspections and would therefore translate into tremendous
economic benefits. The sensing system would assist in evaluating the damage
in the structure, either passively or actively. During normal operation,
the intelligent monitoring system would provide real-time in situ structure
load transfer profiles, identifying the efficiency and health of the structure,
to an on-board data acquisition system. The novelty of the proposed approach
in the development of an in situ monitoring system is the employment of
advanced sensing and actuating devices such as MEMS and functional materials,
like piezoelectric materials (Polyvinylidene polymers (PVDF) and piezoelectric
ceramics (PZT)). Moreover, the complexity of signal acquisition, analysis,
and presentation is user specified. For instance, the system can be used
in two modes off-line and on-line mode. In the off-line mode data is collected
at regularly scheduled interval; whereas in the on-line mode the data
is acquired and analyzed on flight.
Ion
Stiharu and Muthukumaran Packirisamy, CRAIQ, Canada
MEMS Based Gas Turbines Control and Monitoring
Systems - a Brief on the CRIAQ Project
Abstract:
MEMS technologies become over the past years more mature and capable to
yield microsensors that are able to stand rugged environment conditions.
The advantages of MEMS among which high reliability, low mass and power
consumption, integration, low cost are most significant, make them desirable
for measurement and monitoring of physical quantities to enhance the performance
of the systems.
Gas Turbines are reliable systems that have been built for commercial use for more than 50 years to operate under rugged conditions. High standards in the safety operation of the gas turbine associated with enhanced performance imposed accurate measurements of pressure, temperature and speed in the very harsh environment of the turbine pointed towards the need of sensors to face the extremely environment conditions. Moreover, research carried out on turbine gas path characteristics indicated the need of measurement in specific areas along the flow path.
CRIAQ priorities are set based on the industry interests. MEMS implementation in gas turbine for control and monitoring has been considered among the critical topics of interest for the aerospace industry in Quebec. The implementation of MEMS in is a quite challenging task due to the harsh environment conditions that sensors have to face as well as the high cost of qualification when changes are operated in the engine system.
The objective of the project is double-fold and conceived
to respond both above listed challenges. The project is layout over three
years and consists of two overlapping phases. First phase: the phase of
substitution focuses on building up confidence on MEMS devices. Some of
the appropriate microsensors used in the automotive industry will be integrated
to be implemented in the gas turbine . It is expected mass savings of
more than 50% of the mass of the presently used sensors.
The second phase will be focusing on the development of microsensors that
are not available on the market to be used in the controls and monitoring
of gas turbine. A number of three systems will be developed: i) sensors
to measure in high temperature environment, ii) monitoring system for
the composition of the exhaust gases, iii) micro-heat exchangers and active
anti-surge control system based on boundary layer modification in the
gas path..
It is expected that the implementation of the above systems to enable
a significant enhancement in the gas turbine performances.
Last update - Dec. 10, 2002
