发电机碳刷多点全周摩擦引起的不稳定振动分析
发布时间：2018-11-04 09:30
【摘要】：以发电机碳刷与转轴之间发生的摩擦振动为对象,研究这类特殊周向多点全周摩擦振动机理。根据碳刷工作原理,建立多点全周摩擦力计算模型,采用热弹性力学方法建立摩擦截面温度场和转子热弯曲计算模型,将热弯曲模型与转子振动有限元模型耦合求解振动响应。以某发电机为例进行分析,仿真分析和试验研究了碳刷轴全周摩擦振动特征。研究表明,发电机碳刷与转轴之间的多点全周摩擦会引发振动周期性波动和爬升,不稳定现象与不平衡力、碳刷-转轴不同心度和碳刷摩擦因数有关,可以通过精细动平衡、适当增大碳刷-转轴不同心度和减小碳刷摩擦因数来消除。
[Abstract]:Taking the friction vibration between the carbon brush and the shaft of the generator as an object, the mechanism of this kind of special circumferential multi-point full-cycle friction vibration is studied. According to the working principle of carbon brush, a multi-point full-cycle friction calculation model is established. The thermoelastic method is used to establish the temperature field of friction cross section and the rotor thermal bending calculation model. The thermal bending model is coupled with the rotor vibration finite element model to solve the vibration response. Taking a generator as an example, the full-circumferential friction vibration characteristics of carbon brush shaft are studied by simulation and experiment. The results show that the multi-point full-cycle friction between the carbon brush and the rotating shaft of the generator will lead to periodic vibration fluctuation and climb, and the instability phenomenon is related to the unbalanced force, the discentricity of the carbon brush-shaft and the friction coefficient of the carbon brush, which can be balanced by fine dynamic balance. Properly increase the carbon brush-axis discentricity and reduce the friction coefficient of the carbon brush to eliminate.
【作者单位】： 南京工程学院能源与动力工程学院;
【基金】：江苏省自然科学基金青年基金(BK20130739)
【分类号】：TM31
[Abstract]:Taking the friction vibration between the carbon brush and the shaft of the generator as an object, the mechanism of this kind of special circumferential multi-point full-cycle friction vibration is studied. According to the working principle of carbon brush, a multi-point full-cycle friction calculation model is established. The thermoelastic method is used to establish the temperature field of friction cross section and the rotor thermal bending calculation model. The thermal bending model is coupled with the rotor vibration finite element model to solve the vibration response. Taking a generator as an example, the full-circumferential friction vibration characteristics of carbon brush shaft are studied by simulation and experiment. The results show that the multi-point full-cycle friction between the carbon brush and the rotating shaft of the generator will lead to periodic vibration fluctuation and climb, and the instability phenomenon is related to the unbalanced force, the discentricity of the carbon brush-shaft and the friction coefficient of the carbon brush, which can be balanced by fine dynamic balance. Properly increase the carbon brush-axis discentricity and reduce the friction coefficient of the carbon brush to eliminate.
【作者单位】： 南京工程学院能源与动力工程学院;
【基金】：江苏省自然科学基金青年基金(BK20130739)
【分类号】：TM31
【参考文献】
相关期刊论文 前2条
1 黄葆华,杨建刚,高N，
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