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在滑油系统全流量磨粒在线静电监测中,针对缺乏与实际物理模型相一致的数学模型以及深入地分析,建立了较准确的数学模型。对信号采集电路的分析表明:带不同极性电荷的磨粒经过静电感应区域时输出的感应电压变化不同,从而确定带电磨粒的极性。同时,引入空间灵敏度概念,对带电磨粒的位置、传感器的轴向长度与径向半径3个影响因素分别进行了研究,所得空间灵敏度曲线彼此印证,进而说明了所建数学模型的准确性。为了证实所建立的数学模型与实际的滑油系统全流量磨粒在线监测数据的一致性,设计了仿真监测试验平台,试验结果表明,虽然监测到的静电感应信号夹杂着噪声,但与理论分析的理想电压输出相似,并且可以判断磨粒所带电荷的极性。
In the online electrostatic monitoring of full-flow abrasive particles in the oil system, a more accurate mathematical model is established for the lack of the mathematical model consistent with the actual physical model and the in-depth analysis. Analysis of the signal acquisition circuit shows that: with different polarity charge particles through the electrostatic induction area when the output voltage of the induced changes in order to determine the polarity of charged abrasive particles. At the same time, the concept of spatial sensitivity was introduced to study the influence of three factors, including the location of the charged abrasive particles, the axial length and the radial radius of the sensor, respectively. The obtained spatial sensitivity curves confirmed each other, and then the accuracy of the mathematical model was demonstrated. In order to verify the consistency between the established mathematical model and the actual on-line monitoring data of the full-flow abrasive particles in the oil system, the simulation monitoring platform was designed. The experimental results show that although the detected electrostatic induction signal is mixed with noises, Ideal voltage output is similar, and can determine the polarity of the abrasive charge.