Abstract
The major purpose of this study is to research the local rub fault transfer mechanism in rotor system, that is, the influence of local faults on the whole rotor system. The proposed rotor model is based on Euler-Bernoulli beam finite elements. The dynamic model takes into account the gyroscopic moment of rotor as well as the elastic support. The local rub fault is equivalent to external excitation in the equations of motion. The local rub fault transfer mechanism derives from the harmonic balance theory by the relationship between the harmonic components of vibration response and the frequency domain response matrices. The response of any other nodes in the rotor system is obtained by the transfer mechanism. Effectiveness and robustness of the transfer mechanism are verified by numerical simulation and experiments. The transfer mechanism has a good applicability for the main vibration faults in rotor system such as rub, misalignment and crack.
Highlights
Rotating machines such as compressor are likely to develop one or more faults
The proposed method and the numerical simulations are verified from experimental investigations
The local fault transfer mechanism in the rotor system is presented in this paper
Summary
Rotating machines such as compressor are likely to develop one or more faults. The faults often occur in local, for example, rub often occurs between impeller and shell, and fatigue crack appears in a shaft section. The faults affect the whole rotor system they only occur locally. The eccentricity of the center of mass along the rotor axis is unavoidable. Excessive unbalance vibration is one of the reasons for the local rub fault. The fault can increase the vibration of the rotor system and create an unstable dynamic behavior
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