Early Detection of Parametric Roll Resonance on Container Ships

Abstract

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Fault diagnosis of downhole drilling incidents using adaptive observers and statistical change detection

“…Thresholds can be found based on specified probability of false alarms P FA [28], by determining the distribution of the GLRT test statistic g(k) for data under H 0 , see, e.g., [34,35]. In [15] the GLRT test statistic (14) was found to have a good fit to the Weibull distribution.…”

Early Pack-Off Diagnosis in Drilling Using an Adaptive Observer and Statistical Change Detection

“…This plot shows that the test statistic better fits a Weibull distribution, which therefore will be used to determine thresholds. Fitting GLRT statistics to distrubutions other than the χ 2 -distribution, such as the Weibull and lognormal distributions, was done in Galeazzi et al (2013) and Hansen and Blanke (2014). Let Q(x; α, β) be the inverse cumulative distribution of the Weibull distribution with statistical parameters α, β.…”

Diagnosis of Wing Icing Through Lift and Drag Coefficient Change Detection for Small

“…For the modified GLRT, here denoted T (x), an asymptotic result exists for large data records (N → ∞) Kay (1998), Galeazzi et al (2013).…”