C. Constantinescu, IMPACT OF NEAR-COINCIDENT FAULTS ON DIGITAL FLIGHT CONTROL-SYSTEMS, Journal of guidance, control, and dynamics, 18(1), 1995, pp. 102-107
The effects of near-coincident faults must be taken into account in de
signing highly reliable digital flight control systems. In this paper
closed-form solutions for permanent and transient near-coincident Faul
t factors are derived, based on the behavioral decomposition/aggregati
on technique and Markov version of the CARE III coverage model. Parame
ters of the model are assumed to be exponentially distributed, The inf
luence of fault detection rate, fault detectability, error production
and propagation rates, error detectability, and transient fault/error
transition rate on the near-coincident fault factors is discussed. Eve
ntually, a homogeneous, continuous-time Markov chain is used for descr
ibing a triple modular redundant (TMR) system. The near-coincident fau
lt factors are employed for analyzing the effect of the interfering fa
ults on reliability of the TMR computer System reliability and near-co
incident fault unreliability are plotted as functions of mission time,
fault detectability, and weight of permanent and transient fault/erro
rs. The impact of near-coincident faults can be curbed by increasing f
ault detectability, That impact is also lower when the percentage of t
ransients is higher.