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Rotational speed is a key parameter in the condition monitoring of rotating machineries such as generators, electromotors, centrifugal and machine tool spindles. The fundamental principles and preliminary results of rotational speed measurement using electrostatic sensors have been reported previously. However, it is not known how the material type, size and surface roughness of the rotor affect the...
Condition monitoring is a key step to identify the health status of working machinery and establish a necessary maintenance strategy. This paper proposes a novel intelligent system for the online monitoring of the operating conditions of rotating machinery using electrostatic sensors and signal processing techniques. This system is capable of providing simultaneous measurements of rotational speed,...
Rotational speed is a key parameter for the condition monitoring and control of rotating equipment such as generators, electromotors, centrifugal and machine tool spindles. This paper presents the principle and application of electrostatic sensors and correlation signal processing techniques to real-time measurement of rotational speed. Experimental tests were conducted on a test rig under a range...
The pneumatic conveyance of granular or pulverised materials is widely seen in many industries. The size distribution of pneumatically conveyed particles should be monitored to ensure product quality, improve process efficiency and reduce atmospheric emissions. For instance, particle size distribution of pulverised fuel in the power generation industry is an important parameter in relation to combustion...
Accurate strip speed measurement is desirable in certain manufacturing industries. This paper presents the recent development in the non-contact measurement of strip speed using electrostatic sensors in conjunction with correlation signal processing techniques. A pair of narrow strip electrodes is used to derive signals from a moving solid surface. The speed of the solid surface is then determined...
This paper presents the latest development in the velocity measurement of pulverized coal and biomass fuels in pneumatic pipelines using electrostatic sensors in combination with correlation signal processing techniques. A comparative study of electrostatic sensors with circular and rod electrodes was conducted on a 94mm bore horizontal pipeline feeding a 4 MW industrial scale furnace. Experimental...
This paper reports recent advances in the optimisation of intrusive electrostatic sensors for the continuous velocity measurement of particles in pneumatic conveying pipelines. The effects of electrode dimensions and intrusion depth on sensor signals and correlation based velocity measurement have been investigated. Different cross sectional shapes of the electrodes have been compared. The optimum...
It is important to study the interface fluctuations between the two phases in a gas/liquid flow to achieve an in-depth understanding of the mixture flow and subsequent optimization of industrial processes. This paper presents a study of the interface fluctuations between the gas and liquid phases in a pipeline. Experimental data are obtained from a gas/liquid two-phase flow rig through electrical...
Cross-correlation methods in combination with electrostatic sensing technology offer a promising solution to the on-line continuous measurement of velocity of particulate solids in pneumatic pipelines. The sampling frequency and integral time are two fundamental parameters in cross-correlation calculation. This paper describes the principles and steps of the selection of these two parameters. The...
Presented in this paper is a new flame monitor that uses three photovoltaic cells covering UV, visible and IR spectral bands respectively. A gain adjustable amplifier is incorporated into the monitor so that it is applicable to coal, oil or gas fired flames. Self-checking of the monitor is implemented through cross-correlation of the signals from the three cells and hence no additional self-checking...
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