多事件激励的滚动轴承动力学建模

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (17) : 16-24.

论文

多事件激励的滚动轴承动力学建模

常斌全1，剡昌锋1，苑浩1,3，康建雄1,2，王凯1，吴黎晓1

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Dynamic modeling for rolling bearings under multi-event excitation

CHANG Binquan1,YAN Changfeng1,YUAN Hao1,3,KANG Jianxiong1,2,WANG Kai1,WU Lixiao1

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摘要

针对径向载荷作用下滚动轴承表面局部缺陷引起的振动问题，为了更加准确地揭示振动响应的机理，将滚动体经过缺陷的接触过程进一步细化为多事件，建立了内圈表面存在局部缺陷的滚动轴承2自由度动力学模型。将滚动体从进入缺陷到离开缺陷的过程细化为进入事件、冲击事件、离开事件和载荷补偿事件，根据相应事件构造合适的激励力函数；考虑缺陷和轴承变刚度振动引起的时变位移对动力学响应特性的影响，基于赫兹接触理论，建立局部缺陷轴承的动力学模型。利用四阶变步长的龙格库塔法对动力学方程进行求解，得到了振动响应信号；同时研究了缺陷尺寸和转速对轴承系统振动加速度幅值的影响规律。通过故障轴承实验，验证了模型的正确性和可靠性。

Abstract

A 2-DOF dynamic model for rolling bearings was built to reveal their vibration response mechanism more correctly due to their inner race surface existing localized defects under action of radial loads. The process of rolling elements entering defective area until leaving was described as four events including entry event,impact one,exit one and load compensation one. Appropriate excitation force functions were constructed according to the corresponding events. Considering the effects of time-varying displacements due to defects and bearing’s stiffness-varying vibrations on bearing’s dynamic characteristics,based on Hertz contact theory,the dynamic model for a bearing with local defects was established. The fourth-order Runge-Kutta method with varying steps was used to solve the dynamic equation and obtain the model’s vibration response signals. The effect laws of defect size and rotating speed on bearing system’s vibration acceleration amplitude were investigated. The validity and feasibility of the dynamic model were verified using faulty bearings’tests.

Key words

multi-event / local defect / time-varying displacements / rolling bearing / dynamic modeling

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常斌全1，剡昌锋1，苑浩1,3，康建雄1,2，王凯1，吴黎晓1. 多事件激励的滚动轴承动力学建模[J]. 振动与冲击, 2018, 37(17): 16-24

CHANG Binquan1,YAN Changfeng1,YUAN Hao1,3,KANG Jianxiong1,2,WANG Kai1,WU Lixiao1. Dynamic modeling for rolling bearings under multi-event excitation[J]. Journal of Vibration and Shock, 2018, 37(17): 16-24

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