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

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

doi:10.1117/12.484297

Cited by 30 publications

(22 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There are numerous published contributions on the subject of crack modeling, early detection, location and estimation of severity of cracks. Usually, the methods of fault detection and diagnosis for cracked rotors are categorized into three groups: (1) vibration-based methods, which include signal-based (Bently and Muszynska, 1986;Saavedra and Cuitino, 2002) and model-based methods (Bachschmid et al, 2000;Sekhar, 2004;Pennacchi et al, 2006); (2) modal testing methods (Sawicki et al, 2003(Sawicki et al, , 2008(Sawicki et al, , 2009; and (3) non traditional methods (He et al, 2001;Guo and Peng, 2007;Xiang et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Auxiliary state variables for rotor crack detection

Kulesza

Sawicki

2010

Journal of Vibration and Control

View full text Add to dashboard Cite

In the present study, a new model-based method for rotor crack detection and crack location is proposed. The finiteelement model of the rotor-bearing system accounts for the breathing mechanism of the crack. The model of the rotor system is augmented with an auxiliary single-degree-of-freedom oscillator. The observer is designed and the estimates of its two auxiliary state variables are proposed as crack indicators. The crack location along the shaft is determined by designing a set of observers, which calculate the values of these indicators for different possible crack locations along the shaft. The proposed method is validated numerically and the results prove its capability to detect and locate the crack. Further study will include experimental and numerical investigations to make the approach more robust.

show abstract

Section: Introductionmentioning

confidence: 99%

Auxiliary state variables for rotor crack detection

Kulesza

Sawicki

2010

Journal of Vibration and Control

View full text Add to dashboard Cite

show abstract

“…Their experimental results exhibited the existence of significant torsional vibrations, due to coupling with the lateral modes. Sawicki et al [6,7] studied transient response of the cracked rotor, including the stalling effect under the constant driving torque. flexural vibrations are studied for a rotor with a breathing crack model.…”

Section: Introductionmentioning

confidence: 99%

Application of nonlinear dynamics tools for diagnosis of cracked rotor vibration signatures

Sawicki

Gyekenyesi

et al. 2005

SPIE Proceedings

Self Cite

View full text Add to dashboard Cite

The nonlinear model of the cracked Jeffcott rotor is investigated, with the particular focus on study of rotor's vibrational response using tools of nonlinear dynamics. The considered model accounts for nonlinear behavior of the crack and coupling between lateral and torsional modes of vibrations. Load torque is applied to the rotor which is laterally loaded with a constant radial force (gravity force) and unbalance excitation. The co-existence of frequencies of lateral modes in the frequency spectra of torsional mode are characteristics of the coupling response of lateral and torsional vibrations. When only the lateral excitations are applied, vibration amplitude bifurcation plot with the shaft speed as a control parameter, demonstrates some speed ranges for which vibrations of the rotor dramatically increase. Furthermore, the torsional response amplitude at the same speed ranges also increases and chaotic behavior can be observed due to the lateral excitations. These phenomena cannot be observed for pure lateral vibration response with the torsionally rigid rotor assumption.A cracked Jeffcott rotor with lateral and angular (torsional) degrees of freedom is considered. The rotor is subjected to a constant radial load (gravity force), rotating unbalance force, and the externally applied torque. The coupled torsional-

show abstract

“…Practically, we often have some priori knowledge for faults, for example, the broken rotor bar fault for squirrel cage motor [24] , the electrical short-circuit fault [25], the resonance fault [26] and so on, whose dynamic characteristics are all known.…”

Section: Remarkmentioning

confidence: 99%