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Four different fault signals are simulated and collected which are oil whip fault signal, rub-impact fault signal, rub-oil whip coupling fault signal and rub - oil whip - loose coupling fault signal In the experimental stage. Using fractal theory, fractal dimension of vibration signal of X direction and the Y direction are separately calculated and resultant dimension of these two directions is obtained...
In connection with the nonlinear dynamic characteristics shown from the performance of fault rotating mechanical system, based on the research and analysis, correlation dimension and complexity can be used to characterize the system state of motion. The authors propose the analysis method of correlation dimension and complexity to the signal feature of mechanical fault. Using theory of phase space...
In connection with the nonlinear dynamic characteristics shown from the performance of fault rotating mechanical system, based on the research and analysis, complexity and approximate entropy can be used to characterize the system state of motion and non-degree rule. The authors propose to apply complexity and approximate entropy to the feature extraction of fault signal. From the analysis and calculation...
The time series of rotor system are tested under 3 different working conditions in this paper, which respectively calculates the largest Lyapunov exponent and general dimension, and analyzes and studies these two characteristic quantities. The study results show that: the Lyapunov exponent and general dimension of the time series for rotor system under different working conditions are different. Therefore,...
Aiming at oil-film instability fault often occurring in the project, fault simulation experiment was simulated by using a rotor test rig, and vibration signals of two groups were collected by adjusting thickness of disc and shaft length. Fault features were extracted by using spectrum cascades, reassigned wavelet scalograms and rotor trajectories. Some new interesting features are obtained by feature...
In practical rotor systems, rotor-stator rub-impact may occur because crack fault causes the increase of vibration amplitude, which is called coupling fault with crack and rub-impact. The vibration signal is non-stationary due to the strong nonlinear characteristics of the coupling fault. In this paper, a rotor test rig was designed to research on nonlinear vibration characteristics of rotor systems...
A nonlinear dynamic model of rub-impact rotor-bearing system with slowly varying mass was set up. The periodic solution of system was analyzed by continuation-shooting algorithm for periodic solution of nonlinear non-autonomous system, and the stability of system periodic motion and unsteady law are discussed by Floquet theory. There exist periodic, quasi-periodic and chaotic motions in the response...
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