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Hardware cross monitoring

Hardware cross monitoring

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Fault tolerance is achieved through hardware redundancy in repeated hardware elements to provide protection against localised damage in safety-critical systems. Examples of such systems include aircraft, space vehicles, nuclear power plants and plants handling dangerous chemicals. One method in achieving fault detection and fault isolation is through hardware cross monitoring, where the performance of the repeated components is continuously assessed and compared. This technique is simple to apply and is widely used. The drawbacks include the extra hardware cost and the additional space required to accommodate the duplicated equipment. In this chapter, this technique will be presented to calculate the threshold values on a multi-lane actuator in torque and velocity summed architectures. The brushless dc motors in both architectures will be represented by their lumped models. The FDI system (discussed in Chapter 5) will be implemented to monitor the actuator for failures in feedback transducers as well as the currents in each lane.

Chapter Contents:

  • 6.1 Peak lane disparities
  • 6.2 Scheduled threshold setting, STS - failure transients and aircraft response
  • 6.3 Unscheduled threshold setting (UTS) - a simulation graphical Monte Carlo (SGMC) approach

Inspec keywords: brushless DC motors; redundancy; fault diagnosis; electric actuators

Other keywords: FDI system; brushless dc motors; actuator lumped models; localised damage; feedback transducers; threshold values; fault tolerance; velocity summed architectures; safety-critical systems; multi-lane actuator; hardware cross monitoring; torque summed architectures; hardware redundancy

Subjects: Control gear and apparatus; d.c. machines; Electric actuators and final control equipment; Small and special purpose electric machines

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