Abstract
Transverse breathing cracks are a primary damage mode in rotor systems and seriously influence the safety and reliability of equipment operation. The vibration characteristics exhibited by cracked rotors when passing through critical speeds serve as important evidence in the diagnosis of cracks, and a breathing mechanism model without weight dominance is needed to study these resonant characteristics. In this work, a restoring force modified model is proposed for studying the breathing mechanism of cracked Jeffcott rotors without weight dominance. Furthermore, a novel phase waterfall plot method that can identify frequency components with weak amplitudes is proposed to analyze the vibration response characteristics of cracked Jeffcott rotors. Numerical and experimental studies indicate that the phase waterfall plots effectively recognize the weak characteristic frequencies of cracked rotors. This study can also provide references for the crack monitoring of rotor systems.
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Jingsong Xie obtained his B.S. from the School of Mechanical Engineering at Northwestern Polytechnical University in 2013. He is currently studying at Xi’an Jiaotong University for his Ph.D. in engineering. His research interests include rotor dynamics, vibration analysis, and crack diagnosis.
Wei Cheng obtained his B.S., M.S., and Ph.D. from the School of Mechanical Engineering at Xi’an Jiaotong University in 2006, 2008, and 2012, respectively. He is currently an Associate Professor at Xi’an Jiaotong University. His research interests include vibration transfer path analysis, vibration source contribution evaluation, and machinery fault diagnosis.
Yanyang Zi obtained his B.S. and Ph.D. from the School of Mechanical Engineering at Xi’an Jiaotong University in 1993 and 2001, respectively. He is currently a Professor at the Department of Mechanical Engineering in Xi’an Jiaotong University. His research interests include vibration signal processing, machinery condition monitoring, and fault diagnosis.
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Xie, J., Cheng, W. & Zi, Y. Modified breathing mechanism model and phase waterfall plot diagnostic method for cracked rotors. J Mech Sci Technol 32, 2527–2539 (2018). https://doi.org/10.1007/s12206-018-0510-4
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DOI: https://doi.org/10.1007/s12206-018-0510-4