Nonlinear response prediction of cracked rotor based on EMD

2015 ◽  
Vol 352 (8) ◽  
pp. 3378-3393 ◽  
Author(s):  
Yongfeng Yang ◽  
Hu Chen ◽  
Tingdong Jiang
Keyword(s):  
Nonlinear Response ◽  
Response Prediction ◽  
Cracked Rotor

Nonlinear Response Characteristics of a Cracked Rotor in Maneuvering Aircraft

2003 ◽  
Author(s):  
Fu-Sheng Lin ◽  
Guang Meng ◽  
Eric Hahn
Keyword(s):  
Fault Diagnosis ◽  
Constant Velocity ◽  
Nonlinear Response ◽  
Nonlinear Behavior ◽  
Rotor System ◽  
Parameter Range ◽  
Cracked Rotor ◽  
Periodic Response ◽  
Response Characteristics ◽  
Cracked Rotor System

This paper investigates numerically the nonlinear response of a simple cracked rotor in moving supports, as may occur in aircraft rotors when the aircraft is maneuvering with constant velocity or acceleration. Of particular interest is the influence of the aircraft climb angle. Results show that the climb angle can markedly affect the parameter range for which the system is stable; and over which there results bifurcation, quasi-periodic response or chaotic response. It is shown that aircraft acceleration can also significantly affect the nonlinear behavior of the cracked rotor system, illustrating the possibility for online rotor crack fault diagnosis.

Multi-extremum-modified response basis model for nonlinear response prediction of dynamic turbine blisk

2021 ◽  
Author(s):  
Behrooz Keshtegar ◽  
Mansour Bagheri ◽  
Cheng-Wei Fei ◽  
Cheng Lu ◽  
Osman Taylan ◽  
...  
Keyword(s):  
Nonlinear Response ◽  
Response Prediction ◽  
Turbine Blisk

NONLINEAR DYNAMIC RESPONSE AND CHAOS OF A CRACKED ROTOR WITH TWO DISKS

2003 ◽  
Vol 13 (11) ◽  
pp. 3425-3436 ◽  
Author(s):  
WEIYANG QIN ◽  
GUANG MENG
Keyword(s):  
Dynamic Response ◽  
Nonlinear Dynamic ◽  
Nonlinear Response ◽  
Damping Ratio ◽  
Crack Depth ◽  
Cracked Rotor ◽  
Nonlinear Dynamic Response ◽  
Motion Equations ◽  
Rotating Speed ◽  
Periodic Bifurcation

In this paper, the nonlinear response and chaos of a cracked rotor with two disks are studied. Considering the breadth of crack in one rotor revolution, the motion equations of the system are derived and then solved. The results show that the rotor response is sensitive to the crack depth, rotating speed, damping ratio and imbalance. When a crack occurs, the frequency of swing vibration is a multiple of rotating speed (NΩ,N=2,3,…). There are three main routes for response to chaos, that is from quasi-periodic to chaos, from quasi-periodic to quasi-periodic bifurcation and then to chaos and the intermittence to chaos. The intermittence chaos occurs even for a small crack. With the intermittence chaos range there exists the periodic-doubling bifurcation with time. Larger imbalance parameter and damping ratio can suppress chaos. The diagram of time-phase is a useful way to analyze the nonlinear response.

Analysis on the nonlinear response of cracked rotor in hover flight

2009 ◽  
Vol 61 (1-2) ◽  
pp. 183-192 ◽  
Author(s):  
Yongfeng Yang ◽  
Xingmin Ren ◽  
Weiyang Qin ◽  
Yafeng Wu ◽  
Xizhe Zhi
Keyword(s):  
Nonlinear Response ◽  
Cracked Rotor ◽  
Hover Flight

scholarly journals Erratum to: Analysis on the nonlinear response of cracked rotor in hover flight

2010 ◽  
Vol 62 (4) ◽  
pp. 1009-1010
Author(s):  
Yongfeng Yang ◽  
Xingmin Ren ◽  
Weiyang Qin ◽  
Yafeng Wu ◽  
Xizhe Zhi
Keyword(s):  
Nonlinear Response ◽  
Cracked Rotor ◽  
Hover Flight

scholarly journals Vibration and Stability Analysis of a Bearing–Rotor System with Transverse Breathing Crack and Initial Bending

Machines ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 79
Author(s):  
Yuehua Wang ◽  
Xin Xiong ◽  
Xiong Hu
Keyword(s):  
Nonlinear Response ◽  
Crack Depth ◽  
Rotor System ◽  
Frequency Change ◽  
Breathing Crack ◽  
Cracked Rotor ◽  
Rotor Systems ◽  
Vibrational Characteristics ◽  
The Stability ◽  
Cracked Shaft

This paper focuses on the stability and nonlinear response of a bearing-rotor system affected by a transverse crack and initial bending which was thought to be part of an unbalance or had been neglected before. The differences of breathing functions for the transverse breathing crack caused by initial bending is presented here, and the calculation of time-varying finite elements stiffness matrix of the cracked shaft is improved by replacing traditional the approximate crack segment with an exact area. After establishing the dynamic model of the cracked rotor with initial bending, vibrational characteristics such as amplitude-speed diagram, frequency spectrogram and bifurcations are investigated in detail. The eigenvalues of the transition matrix are calculated and analyzed as an indicator of dynamic stability with the growths of crack depth and initial bending. Many differences are found between the two cases of dynamic response of rotor system by numerical simulation. The frequency change with the growth of initial bending is opposite to the change with the growth of crack depth, and the shapes of amplitude-speed also having great different features. Stable regions are reduced and extended laterally by initial bending. All these results obtained in this paper will contribute to identify the bending fault and assess the stability of the bearing-rotor systems.

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