A health index, Mahalanobis distance (MD), is proposed to indicate the health condition of cooling fan and induction motor based on vibration signal. Anomaly detection and fault classification are accomplished by comparing MDs, which are calculated based on the feature data set extracted from the vibration signals under normal and abnormal conditions. Since MD is a non-negative and non-Gaussian...

Drilling is a widely used machining process. With every hole drilled, a drill-bit gradually degrades until it breaks. In certain special applications replacing a drill-bit after it's breakage can be costly. In such cases degradation signals are often used to make a decision whether or not to replace the tool. However, very often the requirement of making a decision online, leads to online colle...

Obstructive sleep apnea (OSA) has become an important public health concern. Polysomnography (PSG) is traditionally considered an established and effective diagnostic tool providing information on the severity of OSA and the degree of sleep fragmentation. However, the numerous steps in the PSG test to diagnose OSA are costly and time consuming. This study aimed to apply the multiclass Mahalanob...