Microelectromechanical systems (MEMS) offer numerous applications thanks to their miniaturization, low power consumption and tight integration with control and sense electronics. They are used in automotive, biomedical, aerospace and communication technologies to achieve different functions in sensing, actuating and controlling. However, these microsystems are subject to degradations and failur...

Vibration diagnostic algorithms used to identify incipient bearing faults are installed in Digital Source Collectors (DSC) on nearly 2000 US Army rotorcraft. These algorithms depend on the structural vibration characteristics of the bearings, gearboxes, and mounting brackets to transmit the signatures associated with bearing abnormalities and faults. Two distinct algorithm families exist to mea...

S U M M A R Y Under extreme conditions like those encountered during earthquake slip, frictional melt is likely to occur. It has been observed on ancient faults that the melt is mostly extruded toward local extensional jogs or lateral tension cracks. In the case of laboratory experiments with a rotary shear apparatus, melt is extruded from the sample borders. When this happens, a thin and irreg...

Centrifugal booster fans are important equipment used to recover blast furnace gas (BFG) for generating electricity, but blade crack faults (BCFs) in centrifugal booster fans can lead to unscheduled breakdowns and potentially serious accidents, so in this work quantitative fault identification and an abnormal alarm strategy based on acquired historical sensor-dependent vibration data is propose...

extension of inter-turn fault in windings of pmsm can damage all parts of electrical systems, and in some cases in sensitive applications may lead to irreparable events. identification of such small faults at incipient steps can be so helpful to protect entire part of electrical system. in this paper, intelligent protection system is designed which is made by two major parts. in the first part ...

Transient impulses caused by local faults are critical informative indicators for rolling element bearing fault diagnosis. The methods accurately extracting transient while suppressing strong background noise and interference components have received extensive studies. In this article, a novel diagnosis scheme based on optimized wavelet packet denoising modulation signal bispectrum is proposed,...

In this article, a fast krill herd algorithm is developed for prognosis of hybrid mechatronic system using the improved Wiener degradation process. First, diagnostic bond graph used to model and derive global analytical redundancy relations. Based on relations, fault signature matrix mode change isolation can be obtained. Second, in order determine true faults from suspected candidates after is...