Study on the Overcritical Dynamic Characteristics of Flexible Rotor-auxiliary Support System

doi:10.3901/JME.2025.07.349

Abstract

Abstract: The helicopter supercritical taildrive horizontal shaft system facing overcritical resonance problems, and the existing amplitude-limit device fails to effectively avoid the violent rubbing, which may lead to the vibration of the tail drive shaft exceeding the limit, and there is an urgent need to carry out the design of a new limiting device for the tail drive shaft system and the analysis of the overcritical dynamic characteristics. To this end, a flexible shaft auxiliary support is designed, and the Jeffcott rotor-auxiliary support is taken as the research object, and the system dynamics model and the shaft-snubber ring rubbing force model are established according to the finite element method and contact theory respectively. A numerical simulation of the amplitude-frequency response of the rotor run-up under different parameters is carried out, and the contact-induced nonlinear dynamics are analyzed through the shaft orbits, bifurcation diagram, and three-dimensional spectrogram. The principle prototype design of the auxiliary support is developed, and the effectiveness of the protection bearing in suppressing the rotor over-critical resonance is verified through experiments, and the maximum amplitude could be reduced by more than 70%. The results show that the designed auxiliary support has a good vibration suppression effect, and its performance is affected by parameters such as clearance, leaf spring stiffness, and contact stiffness, and the rotor over-critical amplitude can be significantly reduced through the stiffness switching mechanism, and the study can provide theoretical guidance for the design of helicopter tail drive shaft system vibration reduction.

Key words: rotordynamics, auxiliary support, vibration suppression, rubbing, nonlinear

CLC Number:

TB535
V231

MA Xinxing, ZHANG Zhenguo, LI Jian, CAO Peng, HUA Hongxing. Study on the Overcritical Dynamic Characteristics of Flexible Rotor-auxiliary Support System[J]. Journal of Mechanical Engineering, 2025, 61(7): 349-360.

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