Rotational Speed Measurement Using Single and Dual Electrostatic Sensors
Rotational Speed Measurement Using Single and Dual Electrostatic Sensors
复制标题
使用单静电传感器和双静电传感器测量转速
DOI：
10.1109/jsen.2014.2368091
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发表时间：
2015-03-01
影响因子：
4.3
通讯作者：
Qian, Xiangchen
中科院分区：
文献类型：
--
作者：
Wang, Lijuan;Yan, Yong;Qian, Xiangchen
转速是许多工业过程中旋转设备状态监测和控制的关键参数。本文提出了一种利用单或双静电传感器与相关信号处理算法相结合的转速测量技术。在单个传感器的情况下，应用自相关算法来处理信号并测量旋转运动的周期。在双传感器的情况下，应用互相关算法来获得两个信号之间的时间延迟，从而获得转速的测量。通过有限元建模，研究了不同尺寸转子的单传感器和双传感器传感技术的基本特性。在一个专门建造的试验台上进行了实验测试，以评估这两种技术在100-3000 r/min的速度范围内的性能。实验测试中使用的转子是由聚氯乙烯制成的，直径分别为60和120 mm。实验结果表明，单传感器测量系统在600-3000 r/min的转速范围内可重复测量，最大误差为±1.2%，而双静电传感器测量系统在更宽的转速范围内可实现有效测量（100-2000 r/min），虽然测量误差大于单传感器系统。这两种技术在更高的旋转速度下使用更大的转子表现更好。
Rotational speed is a key parameter for condition monitoring and control of rotating devices in many industrial processes. This paper presents a technique for the rotational speed measurement using a single or dual electrostatic sensors coupled with correlation signal processing algorithms. In the case of a single sensor, autocorrelation algorithm is applied to process the signal and measure the period of the rotational motion. In the case of dual sensors, cross correlation algorithm is applied to obtain the time delay between the two signals and hence the measurement of rotational speed. The fundamental characteristics of the sensing techniques with single or dual sensors for different sized rotors are studied through finite-element modeling. Experimental tests were conducted on a purpose-built test rig to assess the performance of both techniques over the speed range of 100-3000 r/min. The rotors used in the experimental tests are made of polyvinyl chloride with a diameter of 60 and 120 mm, respectively. Experimental results suggest that the measurement system using a single sensor is capable of producing repeatable rotational speed measurement with a maximum error of ±1.2% over the speed range of 600-3000 r/min. However, the measurement system with dual electrostatic sensors is capable of achieving valid measurements over a wider range of speeds (100-2000 r/min), although the measurement error is larger than that of the single-sensor system. Both techniques perform better with a larger rotor under a higher rotational speed.