The previous chapter presented hardware cross monitoring in both architectures, and showed that the largest failure transients were motor failures related. Although the design met the aircraft response in roll, repeated hardware components in hardware cross monitoring necessitates for larger installation compartments. Therefore, this chapter proposes and compares digital cross monitoring (with a minimum of two lanes of repeated hardware) to hardware cross monitoring. Here, the hardware will be represented by three-phase equivalents and the digital mathematical model will be represented by the lumped model equivalent. The threephase hardware representation allows for detailed response examination in the presence of torque ripples contributed by the individual lanes. The Simulation Graphical Monte Carlo (SGMC) method will be implemented in this chapter too as a threshold setting technique.

Chapter Contents:

• 7.1 Hardware cross monitoring
• 7.1.1 Unscheduled threshold settings (UTS)
• 7.1.2 Failure transients and aircraft response
• 7.2 Digital cross monitoring (DCM)
• 7.2.1 Unscheduled threshold setting
• 7.2.2 Failure transients
• 7.2.3 Hardware versus digital cross monitoring

Inspec keywords: electric actuators; Monte Carlo methods; fault diagnosis

Other keywords: three-phase equivalents; digital mathematical model; simulation graphical Monte Carlo method; threshold setting technique; digital cross monitoring; lumped model equivalent; aircraft torque ripples; hardware cross monitoring

Subjects: Control gear and apparatus; Electric actuators and final control equipment