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Abstract
In industrial production processes, rotational speed is a key parameter for equipment condition monitoring and fault diagnosis. To achieve rotational speed measurement of rotational equipment under a condition of high temperature and heavy dust, this article proposes a digital approach using an electrostatic sensor. The proposed method utilizes a strip of a predetermined material stuck on the rotational shaft which will accumulate a charge because of the relative motion with the air. Then an electrostatic sensor mounted near the strip is employed to obtain the fluctuating signal related to the rotation of the charged strip. Via a signal conversion circuit, a square wave, the frequency of which equals that of the rotation shaft can be obtained. Having the square wave, the M/T method and T method are adopted to work out the rotational speed. Experiments were conducted on a laboratory-scale test rig to compare the proposed method with the auto-correlation method. The largest relative errors of the auto-correlation method with the sampling rate of 2 ksps, 5 ksps are 3.2% and 1.3%, respectively. The relative errors using digital approaches are both within ±4‰. The linearity of the digital approach combined with the M/T method or T method is also superior to that of the auto-correlation method. The performance of the standard deviations and response speed was also compared and analyzed to show the priority of the digital approach.
Highlights
Rotational speed measurement is a crucial part for condition monitoring, speed control, and protective supervision of rotation equipment, such as generators, steam turbines, and gas turbines
For the of sake ofwaveform improving the performance of rotational speedaffected measurement via the electrostatic computational accuracy of the correlation method is obviously affected by the sampling rate and signal noise method, this paper proposes an approach to generate a square wave from an electrostatic sensor signal noise
Method, this paper proposes an approach to generate a square wave from an electrostatic sensor in order to obtain the to rotational speed via digital eliminating thegenerates influencea pulse of the refers the output waveform from methods, the comparison circuit which order to obtain thesignal rotational viasimplifying digital methods, thuscomplexity
Summary
Rotational speed measurement is a crucial part for condition monitoring, speed control, and protective supervision of rotation equipment, such as generators, steam turbines, and gas turbines. The electrostatic quantitytime of the generated due to the triboelectric friction are mainly decided by the material method to measure rotational speed utilizes the electrode to induce the electric field generated by type and surface roughness, and are affected by its surrounding environment, like temperature carried charges on the shaft. The principle rotational contains speed measurement using an electrostatic sensorthus is shown in Figure collected from theof electrode a wealth of rotational information, processing and According to electrostatic induction theory, when the surface of the shaft carries some charge due to analyzing the output signals from the sensor will result in obtaining further information.
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