Vibration-based crack diagnosis in rotating shafts during acceleration through resonance

Jerzy T. Sawicki; Xi Wu; George Y. Baaklini; Andrew L. Gyekenyesi

doi:10.1117/12.484297

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1 August 2003 Vibration-based crack diagnosis in rotating shafts during acceleration through resonance

Jerzy T. Sawicki, Xi Wu, George Y. Baaklini, Andrew L. Gyekenyesi

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Proceedings Volume 5046, Nondestructive Evaluation and Health Monitoring of Aerospace Materials and Composites II; (2003) https://doi.org/10.1117/12.484297
Event: NDE for Health Monitoring and Diagnostics, 2003, San Diego, California, United States

Abstract

The dynamic response of a cracked Jeffcott rotor passing through the critical speed with constant acceleration is investigated analytically and numerically. The nonlinear equations of motion are derived and include a simple hinge model for small cracks and Mayes' modified funciton for deep cracks. The equations of motion are integrated in the rotating coordinate system. The angle between the crack centerline and the shaft vibaiton (whirl) vector is used to determine the clsoing and opening of the crack, allowing one to study the dynamic response with and without the rotor weight dominance. Vibration phase response is used as one of possible tools for detection the existence of cracks. The results of parametric studies of the effect of crack depth, unbalance eccentricity orientation with respect to crack, and the rotor acceleration on the rotor's response are presented.

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Jerzy T. Sawicki, Xi Wu, George Y. Baaklini, and Andrew L. Gyekenyesi "Vibration-based crack diagnosis in rotating shafts during acceleration through resonance", Proc. SPIE 5046, Nondestructive Evaluation and Health Monitoring of Aerospace Materials and Composites II, (1 August 2003); https://doi.org/10.1117/12.484297

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