Analysis of Dynamic Characteristics for a Rotor System with Pedestal Looseness

Ma, Hui; Zhao, Xueyan; Teng, Yunnan; Wen, Bo

doi:10.1155/2011/753047

Cited by 48 publications

(28 citation statements)

References 15 publications

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“…In ref. [7], it presented a finite element model of a rotor system with pedestal looseness stems from a loosened bolt, analyzing the effects of the looseness parameters on its dynamic characteristics.…”

Section: Introductionmentioning

confidence: 99%

Stability analysis of reduced rotor pedestal looseness fault model

Jin

Chen

et al. 2015

Nonlinear Dyn

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In this paper, the nonlinear dynamic characteristics of a rotor system supported by ball bearings with pedestal looseness are analyzed. The model of seven-degrees of freedom (DOFs) rotor system is established by the Newton's second law, which comprises a pair of ball bearings with pedestal looseness at one end. Energy analysis of the original model states that the first two-order proper orthogonal modes occupy almost all the energy of the system, and it demonstrates that the reduced model reserves main dynamical topological characteristics of the original one. A modified proper orthogonal decomposition method is applied in order to reduce the DOFs from seven to two, and the reduced system preserves the bifurcation and amplitude-frequency characteristics of the original one. The harmonic balance method with the alternating frequency-time domain technique is used to calculate the periodic response of the reduced system. Moreover, stability of the two-DOFs model is analyzed based on the known harmonic solution by the Floquet theory.

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Section: Introductionmentioning

confidence: 99%

Stability analysis of reduced rotor pedestal looseness fault model

Jin

Chen

et al. 2015

Nonlinear Dyn

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“…According to (14), the calculated result is 22.7 Hz, and the experimental result is 22.2 Hz, shown in Figure 25(c). Obviously, the analysis results are verified fully.…”

Section: Analysis Of the Second Disk Response At Different Contactmentioning

confidence: 93%

“…Lee et al [13] studied a generalized finite element modeling method of a rotor-bearing system by using the state-space Newmark method based on the average velocity concept. Ma et al [14] established a finite element model of a rotor system with pedestal looseness stemming from a loosened bolt and the effects of the looseness parameters on its dynamic characteristics were analyzed.…”

Section: Introductionmentioning

confidence: 99%

Certain Type Turbofan Engine Whole Vibration Model with Support Looseness Fault and Casing Response Characteristics

Wang

Chen

2014

Shock and Vibration

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Support looseness fault is a type of common fault in aeroengine. Serious looseness fault would emerge under larger unbalanced force, which would cause excessive vibration and even lead to rubbing fault, so it is important to analyze and recognize looseness fault effectively. In this paper, based on certain type turbofan engine structural features, a rotor-support-casing whole model for certain type turbofan aeroengine is established. The rotor and casing systems are modeled by means of the finite element beam method; the support systems are modeled by lumped-mass model; the support looseness fault model is also introduced. The coupled system response is obtained by numerical integral method. In this paper, based on the casing acceleration signals, the impact characteristics of symmetrical stiffness and asymmetric stiffness models are analyzed, finding that the looseness fault would lead to the longitudinal asymmetrical characteristics of acceleration time domain wave and the multiple frequency characteristics, which is consistent with the real trial running vibration signals. Asymmetric stiffness looseness model is verified to be fit for aeroengine looseness fault model.

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“…In this case, amplitude of BSF and its multiple harmonics are not prominent whereas the amplitude of half BSF frequency is significant. In rotating machinery, the existence of rotating frequency, its multiple frequencies and fractional multiple frequencies is symptoms of looseness fault or rub-impact fault [29,30]. Considering the above situation and the abnormal vibration value at Sensor1, it is conjectured to be the looseness-related fault of rolling elements in the bearing of the pinion close to the motor.…”

Section: Applicationsmentioning

confidence: 99%