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No Fault Found: The Search for the Root Cause

Chris Hockley
Univ. of Manchester-Paul Phillips
  • Book
  • R-441
Published 2015-09-03 by SAE International in United States

Today, we are all strongly dependent on the correct functioning of technical systems. They fail, and we become vulnerable. Disruptions due to degradation or anomalous behavior can negatively impact safety, operations, and brand name, reducing the profitability of all elements of the value chain.

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Tracking Over Insulating Surfaces In Aerospace Environments

Univ. of Manchester-Lei Zhang, Ian Cotton
Published 2010-11-02 by SAE International in United States
As aircraft move to using higher voltages, there is an increased risk of electrical failure if clearance and creepage distances of electrical apparatus, especially printed circuit boards (PCBs) are not appropriately maintained. However, conservatism can lead to dimensions being artificially enlarged leading to significant penalties in terms of weight / volume. One failure mode that can exist on insulation of PCBs is electrical tracking across surfaces, particularly those that are contaminated (this mode of failure being distinct to arc tracking in cables). This can eventually lead to electrical failure in the form of a short circuit and could pose a fire risk in some systems. For precise dimensioning of insulation within equipment, it is necessary to understand the mechanisms of electrical tracking as influenced by different environmental conditions. Work has attempted to link the variation of pressure in an aerospace environment with the process of tracking across surfaces contaminated with an aqueous pollutant. This has been done through theoretical analysis and experimental test including the development of new test techniques that can be used in…
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Reconfigurable Aircraft DC Power Networks Laboratory

Univ. of Manchester-Rebecca Todd, Andrew Forsyth
Rolls-Royce-Vince Lowe
Published 2010-11-02 by SAE International in United States
Simulation results are used to illustrate the features and capabilities of a l00kW, 540V DC laboratory system that is under development at the University of Manchester. The laboratory system comprises a twin-spool gas engine emulator with fault-tolerant generators, four active load emulators, an energy storage system and a reconfigurable distribution network. The simulation results examine the effects of parallel generator operation and generator faults, load and bus-bar switching and the impact of the energy storage device.
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