Turbo generator shafts are often subjected to cyclic torsion resulting in formation of large longitudinal cracks as well as circumferential cracks. The presence of these cracks could greatly impact the shaft resonance frequencies. In this paper, dynamic response of a shaft with longitudinal and circumferential cracks is investigated through a comprehensive analytical study. The longitudinally c...

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An energy model that correlates fan airflow, head, speed, and system power input is essential to detect device faults optimize control strategies in systems. Since the application of variable-frequency drives (VFDs) makes motor-efficiency data published by manufacturers inapplicable for VFD–motor–fan systems, efficiency drive (belt–motor–VFD) must be identified each individual obtain accurate m...

In this study, a dynamic model of solar array drive system that includes pair flexible arrays with central rigid shaft and permanent-magnet synchronous motor (PMSM) was developed, disturbance compensation sliding mode control (DCSMC) strategy proposed to realize the speed smoothing vibration suppression system. The continuous nonlinear equation derived from Hamilton’s principle, its linearized ...

in this paper, the effects of transverse cracks on rotating shaft were studied. according to earlier works, crack shaft failure decrease the critical speed of the shaft and also exhibit a nonlinear vibration behaviour leading to increases the amplitude of 1x and 2x harmonics (first and second order of rotational speed in torsional vibration). this suggests that the application of order analysis...

One of the important factors affecting quality mechanized potato harvesting is technical condition combine. To maintain necessary level reliability and durability agricultural machinery used in process, authors proposed to diagnose mechanical drive combine with two modes scrolling shaft: free fixed. This approach allows you determine dynamic indicators by which it possible identify malfunctions...