“…The incipient faults (drifts) are parameterized by a slope, allowing for different shapes (logarithmic, constant or exponential), reflecting different possible malfunctions. We didn't consider combinations of faults into a single pattern, as the aforementioned fault types are the most common ones (Luo, 2006), and the most studied along the literature as well (Zhang, Polycarpou, & Parisini, 2000) (Zhang, Polycarpou, & Parisini, 2002) (Parlangeli, Pacella, & Corradini, 2007) (Serdio, Lughofer, Pichler, Buchegger, & Efendic, 2014.a) (Serdio, Lughofer, Pichler, Buchegger, & Efendic, 2014b) (Serdio et al, 2015).…”