分布式摩擦激励下轴系振动研究

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振动与冲击 ›› 2014, Vol. 33 ›› Issue (20) : 99-104.

论文

分布式摩擦激励下轴系振动研究

车凯凯1,2，张振果1,2，张志谊1,2，华宏星1,2

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Distributed-friction induced vibration in the shafting system

CHE Kai-kai1,2，ZHANG Zhen-guo1,2，ZHANG Zhi-yi1,2，HUA Hong-xing1,2

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摘要

针对含水润滑橡胶轴承轴系在摩擦激励与弯扭耦合作用下产生自激振动并诱发异常噪声、而常用的点支承模型无法用于分析轴承分布支承力及轴承倾斜等因素对轴系振动影响，采用分布式轴承支承模型及速度依赖型Stribeck摩擦模型，利用拉格朗日方程及模态展开法建立摩擦激励下轴系动力学模型。用数值仿真研究轴系非线性振动与系统物理参数间关系，探讨接触力、转速、轴承倾斜等因素对轴系响应特性影响。结果表明，在相同摩擦系数、接触力、转速条件下轴承倾斜会使轴系更易产生自激失稳。

Abstract

The coupling between nonlinear friction and bending-torsion vibration can induce self-excited vibration in shaft system with water-lubricated rubber bearing, which can result in abnormal noise. The present researches are mainly based on single-point bearing to establish the dynamic model, which cannot analyze the influence of distributed bearing force and bearing inclination on the vibration characteristics of shaft system. In order to solve this problem, the dynamic model of a shaft system is developed, which is based on distributed bearing model and velocity dependent friction represented by Stribeck curve. The equation of motion is derived using Lagrangian approach and Modal Synthesis Method. Using numerical method, the paper analyzes the relationship between the nonlinear dynamic response and the system’s physical parameters. What’s more, the effects of contact force, rotational speed and the inclination of bearing are also discussed. According to the simulation results, the self-excited vibration in shaft system can be easily obtained for the inclined bearing if other conditions, like contact force, rotational speed and friction parameters, are the same.

导出引用

车凯凯;张振果;张志谊;华宏星;. 分布式摩擦激励下轴系振动研究[J]. 振动与冲击, 2014, 33(20): 99-104

CHE Kai-kai;ZHANG Zhen-guo;ZHANG Zhi-yi;HUA Hong-xing;. Distributed-friction induced vibration in the shafting system[J]. Journal of Vibration and Shock, 2014, 33(20): 99-104