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Fault Propagation Modelling for Fluid System Health Monitoring
Volume 7, Number 2, March 2011 - Paper 3 - pp. 137-154
R. REMENYTE-PRESCOTT and J. D. ANDREWSNottingham Transportation Engineering Centre, University of Nottingham, Nottingham, NG7 2RD, UK
(Received on October 27, 2009, revised on August 04, 2010)
Fault diagnostics systems are incorporated to determine the health of the system they monitor. There are however times when the diagnostics system reports faults which do not exist. This situation commonly arises at system start-up when high vibration levels exist and the systems are not performing in the same way as when they are operational. Unnecessary shutdowns can occur due to transient behaviour of the system. On autonomous vehicles, such as Unmanned Aerial Vehicles (UAVs), information about the health of the system can be used to support the decision making process and to plan the future system operation. When faults are reported on autonomous systems, where there is no pilot to interpret the conditions reported, a method is needed to establish whether the reported faults do exist. Utilizing a fault propagation modeling technique deviations in system variables can be propagated through the system until further evidence of fault presence is observed. If some evidence that contradicts the fault presence is found, the fault can be cancelled and unnecessary shutdowns can be avoided.
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