Misalignment Fault Simulation Method and Experimental Verification Based on Multi-body Dynamics with Transient Contact

doi:10.3901/JME.2023.13.133

Abstract

Abstract: An equivalent simulation and analysis method of rotor system misalignment fault based on multi-body dynamics with contact transient is proposed. By offsetting(deflecting) driving speed, the nonlinear contact motion of each component is simulated to generate misalignment excitation. The mechanical equivalence analysis of the simulation method is carried out. Taking the typical motor-pump system as the object, the corresponding multi-body dynamic model is established. Higher harmonics and corresponding phase characteristics are obtained. The transient contact forces of bolts, the half coupling, all rollers, the bearing inner and outer rings, and the vibration response of the box are studied. The generation mechanism of higher harmonics and the phase on both sides of the coupling are obtained. The correctness of the simulation analysis method is verified through experimental tests. The results show that the misalignment fault characteristics are from the transient contact force between a single bolt and the half coupling. In the vibration response spectrum of the box, in addition to the 1, 2 frequency, there are also 3, 4 frequency and higher harmonics. In case of parallel (angular) misalignment, the phase difference of radial 2 frequency (1 frequency) on both sides of the coupling is about 180° (0°), and it decreases (increases) with the increase of misalignment amount. The fault characteristic frequencies of the box vibration simulation and test results are consistent, and the relative magnitude of each its characteristic frequency amplitude and the variation law with the misalignment amount have a good consistency.

Key words: coupling misalignment, motor-pump rotor system, spectrum analysis, vibration phase, multi-body dynamics

CLC Number:

TH113

ZUO Yanfei, LI Ning, MA Bo, SHI Shouzhou, FENG Kun. Misalignment Fault Simulation Method and Experimental Verification Based on Multi-body Dynamics with Transient Contact[J]. Journal of Mechanical Engineering, 2023, 59(13): 133-147.

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