Vytautas Blechertas

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The present paper addresses systematic approach to Condition-Based Maintenance, and research results at the University of South Carolina Condition-Based Maintenance Research Center, directly related to U.S. Army rotorcraft Vibration Management Enhancement Program. The paper gives an analysis of the CBM concept and its functional layers, such as condition(More)
A new concept of nonparametric signal detection and classification technique is proposed using mutual information measures in the time–frequency domain. The time– frequency-based self-information and mutual information are defined in terms of the cross time–frequency distribution. Based on time–frequency mutual information theory, this paper presents(More)
Accelerometer data has been gathered from accelerated conditioning in grease lubricated and lubrication deprived gear meshes in AH-64 helicopter intermediate and tail rotor gearbox, which are commonly problematic components of the Apache helicopter platform. These tests were performed in a controlled drive-train research test bed, simulating drive-train(More)
This paper deals with changes in the rheological properties of the grease used in the tail rotor and intermediate gearboxes of the Apache AH-64 helicopter when subjected to simultaneous mechanical and thermal loads within the operating temperature limits. From the steady shear rate sweep experiments on grease samples extracted from gearboxes, it was(More)
In critical conditions, gears operate with insufficient lubrication and efforts are made to improve the life of these gears against wear. A local gear-tooth defect such as a fatigue crack, pit, or chip weakens a tooth and causes transient events in the system. The magnitude and duration of these events depend mainly upon the severity of the defect and the(More)
This paper outlines ongoing and future efforts put forward by the Condition-Based Maintenance (CBM) Research Center at the University of South Carolina to improve diagnostic and prognostic capabilities of Digital Source Collector (DSC) systems (Vibration Management Enhancement Program (VMEP), Modern Signal Processing Unit (MSPU), and Integrated Health(More)
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