Nonlinear dynamics of a supercritical tail rotor drive shaft equipped with a hybrid damper

被引：0
|
作者：
Wang D. [1 ]
Song L.-Y. [1 ]
Chen B. [1 ]
Li B. [1 ]
Zhu R.-P. [1 ]
Wu H.-T. [1 ]
机构：
[1] National Key Laboratory of Science and Technology on Helicopter Transmission, Nanjing University of Aeronautics and Astronautics, Nanjing
来源：
Zhendong Gongcheng Xuebao/Journal of Vibration Engineering | 2023年 / 36卷 / 03期
关键词：
double clearance; dry friction; hard-stopping protection; hybrid damper; supercritical tail rotor drive shafts;
D O I：
10.16385/j.cnki.issn.1004-4523.2023.03.001
中图分类号：
学科分类号：
摘要：
The supercritical tail rotor drive shaft of a helicopter vibrates violently when driven through its critical speed. The hybrid damper is a specially-designed damper for the transcritical vibration reduction problem. The tail rotor drive shafts equipped with hybrid dampers are typical nonlinear system with friction and collision，and the dynamic characteristic is extremely complex. In order to uncover the underlying working mechanism and guide the design of the hybrid damper，a spring-mass-dashpot equivalent model with double-clearance structure has been established，the governing equations have been deduced and a systematic numerical simulation has been carried out. The results demonstrate that the working modes of the hybrid damper can be divided into 4 categories according to the unbalance quantity：no-effect mode，normal-damping mode，abnormal-damping mode，and hard-stopping mode. Among them，the hard-stopping mode can provide a temporary protection for a wounded tail rotor drive shaft. In addition，the influence of the initial gap，collision stiffness and the critical friction force on the working performance of the damper has been illustrated. There is an optimal critical friction force associated with each unbalance quantity. Besides，in the hard-stopping mode，the vibration amplitude can be reduced by increasing the collision stiffness between the rubbing ring and the base，which could also induce a greater impact. Moreover，prototypes of the hybrid damper are designed，manufactured and tested on a shaft test rig. The simulation results are well verified by the experiments. © 2023 Nanjing University of Aeronautics an Astronautics. All rights reserved.
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页码：593 / 605
页数：12
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