基于EMD的水电机组甩负荷主轴摆度

发布时间：2018-06-12 17:05

本文选题：水电机组 + 主轴摆度　；参考：《排灌机械工程学报》2017年10期

【摘要】：为解决甩负荷工况下主轴摆度峰峰值计算方法问题,对甩负荷工况与稳态工况下主轴摆度峰峰值计算差异进行对比研究,从时域波形上指出了2种工况下截然不同的特征,据此引入经验模态分解方法对甩负荷工况下的主轴摆度信号进行分解,并建立了趋势项的提取准则.研究结果表明:采用经验模态分解方法可以将主轴摆度信号分解为具有明确物理意义的2个分量,即表征甩负荷工况下轴系从一个稳定状态到另一稳定状态下的轴系偏移分量和表征随机扰动成分的轴系高频脉动分量;根据轴系偏移分量与转速的关系,可以将轴系偏移分量划分为4个阶段;甩负荷情况下主轴摆度峰峰值计算可以分成2个部分,即高频脉动分量峰峰值与轴系偏移量的和.采用具体案例验证了这一过程的有效性.
[Abstract]:In order to solve the problem of calculating the peak value of spindle pendulum peak under load rejection condition, the difference between the peak value calculation of spindle pendulum peak under load rejection condition and that under steady condition is compared. The different characteristics of the peak value under two conditions are pointed out from the time domain waveform. Based on this, empirical mode decomposition method is introduced to decompose the signal of spindle pendulum under load rejection condition, and the extraction criterion of trend term is established. The results show that the principal axis pendulum signal can be decomposed into two components with definite physical meaning by using empirical mode decomposition method. That is, the shift component of shafting from one stable state to another and the high-frequency pulsation component of shafting under load rejection condition, according to the relationship between the shift component and rotational speed of shafting, The shift component of shafting can be divided into four stages, and the peak value of spindle pendulum peak can be divided into two parts under load rejection, that is, the sum of peak of high-frequency pulsating component and offset of shafting. The effectiveness of this process is verified by a case study.
【作者单位】：国网新源控股有限公司技术中心;中国水利水电科学研究院信息中心;
【基金】：国家自然科学基金资助项目(51309258) 国家电网公司科技项目(52573016001G,52573015000R)
【分类号】：TV734

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