Nonlinear response analysis of aero-engine rotor bearing rub-impact system caused by horizontal yawing maneuver load

2021 ◽  
pp. 103800
Author(s):  
Wujiu Pan ◽  
Liangyu Ling ◽  
Haoyong Qu ◽  
Minghai Wang
Keyword(s):  
Nonlinear Response ◽  
Response Analysis ◽  
Impact System ◽  
Aero Engine ◽  
Rotor Bearing ◽  
Maneuver Load ◽  
Engine Rotor

Nonlinear response analysis for an aero engine dual-rotor system coupled by the inter-shaft bearing

2019 ◽  
Vol 89 (7) ◽  
pp. 1275-1288 ◽  
Author(s):  
Zhenyong Lu ◽  
Xiaodong Wang ◽  
Lei Hou ◽  
Yushu Chen ◽  
Xiyu Liu
Keyword(s):  
Nonlinear Response ◽  
Rotor System ◽  
Response Analysis ◽  
Aero Engine

Nonlinear Response Analysis of Three-Span Rotor-Bearing System with Three Cracks in Shafts

2013 ◽  
Vol 753-755 ◽  
pp. 1093-1097
Author(s):  
Song He Zhang ◽  
Yue Gang Luo ◽  
Bin Wu ◽  
Hong Ying Hu
Keyword(s):  
Numerical Simulation ◽  
Dynamic Characteristics ◽  
Nonlinear Response ◽  
Crack Depth ◽  
Response Analysis ◽  
Sliding Bearings ◽  
Rotor Bearing ◽  
Set Up ◽  
Bearing System ◽  
Main Influence

The model of three-span rotor-bearing system with three cracks in shaft supporting on the six sliding bearings was set up. The influences of crack faults to the responses of the rotor system were studied on numerical simulation. Along with the increase of the crack depth in first span, the main influence to the dynamic characteristics of the system is in the first span. Along with the increase of the crack depth in second span, the main influences to the response of first and third spans are in the region of critical rotate speed, and it to the second span is in the regions of critical and supercritical rotate speed. Along with the increase of the crack depth in third span, the main influences to the response of the three spans are in the region of critical rotate speed.

An improved dynamic load-strength interference model for the reliability analysis of aero-engine rotor blade system

2020 ◽  
pp. 095441002097289
Author(s):  
Bingfeng Zhao ◽  
Liyang Xie ◽  
Yu Zhang ◽  
Jungang Ren ◽  
Xin Bai ◽  
...  
Keyword(s):  
Reliability Analysis ◽  
Dynamic Load ◽  
Rotor Blade ◽  
Engineering Application ◽  
Weight Ratio ◽  
System Component ◽  
Aero Engine ◽  
Blade System ◽  
Improved Model ◽  
Engine Rotor

As the power source of an aircraft, aero-engine tends to meet many rigorous requirements for high thrust-weight ratio and reliability with the continuous improvement of aero-engine performance. In this paper, based on the order statistics and stochastic process theory, an improved dynamic load-strength interference (LSI) model was proposed for the reliability analysis of aero-engine rotor blade system, with strength degradation and catastrophic failure involved. In presented model, the “unconventional active” characteristic of rotor blade system, changeable functioning relationships and system-component configurations, was fully considered, which is necessary for both theoretical analysis and engineering application. In addition, to reduce the computation cost, a simplified form of the improved LSI model was also built for convenience of engineering application. To verify the effectiveness of the improved model, reliability of turbojet 7 engine rotor blade system was calculated by the improved LSI model based on the results of static finite element analysis. Compared with the traditional LSI model, the result showed that there were significant differences between the calculation results of the two models, in which the improved model was more appropriate to the practical condition.

Response Analysis of van der Pol Vibro-Impact System with Coulomb Friction Under Gaussian White Noise

2018 ◽  
Vol 28 (13) ◽  
pp. 1830043 ◽  
Author(s):  
Meng Su ◽  
Wei Xu ◽  
Guidong Yang
Keyword(s):  
White Noise ◽  
Coulomb Friction ◽  
Gaussian White Noise ◽  
Original System ◽  
Stochastic Averaging ◽  
Response Analysis ◽  
State Variables ◽  
Van Der Pol ◽  
Impact System ◽  
The Impact

In this paper, the stationary response of a van der Pol vibro-impact system with Coulomb friction excited by Gaussian white noise is studied. The Zhuravlev nonsmooth transformation of the state variables is utilized to transform the original system to a new system without the impact term. Then, the stochastic averaging method is applied to the equivalent system to obtain the stationary probability density functions (pdfs). The accuracy of the analytical results obtained from the proposed procedure is verified by those from the Monte Carlo simulation based on the original system. Effects of different damping coefficients, restitution coefficients, amplitudes of friction and noise intensities on the response are discussed. Additionally, stochastic P-bifurcations are explored.

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