Abstract
Electrical Capacitance Tomography (ECT) is a non-destructive visual measurement technology, which is mainly used in the detection of two-phase flow and multi-phase flow. In this paper, according to the characteristics of the non-uniform sensitive field and the low sensitivity of the central area of the capacitance sensor, the finite element simulation analysis in COMSOL and the orthogonal test design method are introduced to optimize the structural parameters of the capacitance sensor, including the geometric size of the electrode plate, the height of the shield, the thickness of the pipe wall and its relative permittivity. In view of the analytical relationship between the structural parameters and the performance optimization indexes of the capacitance sensor, and there are many parameters need to be optimized, this paper proposes a fuzzy comprehensive satisfaction index (FCSI) as the evaluation standard, and on this basis carries out the optimization design of the structural parameters of the capacitance sensor. The simulation results show that the fuzzy optimization design based on multi index orthogonal experiment makes the capacitance sensor meet the requirements of uniform sensitive field distribution and high reconstruction image quality at the same time.
Highlights
Multi-phase flow is widely used in petrochemical, metallurgy, electric power, energy and other industrial production fields, and its related process parameters detection is very important for the accurate control of the production process and ensure the production safety and efficiency [1], [2]
This paper introduces the method of combining finite element analysis and orthogonal experimental design to optimize the design of the structural parameters that affect the performance of the capacitance sensor, so that the order of the primary and secondary effects of each factor can be determined without passing all the experiments
Based on the related concepts of fuzzy mathematics, this paper proposes a fuzzy analysis method of multi-index orthogonal experiment to comprehensively evaluate the performance of capacitive sensors, using COMSOL finite element simulation software to simulate, make the sensitive field distribution more uniform, and reduce the medium distribution Influence, the media distribution reconstructed from the capacitance measurement value can reflect the original image more accurately
Summary
Multi-phase flow is widely used in petrochemical, metallurgy, electric power, energy and other industrial production fields, and its related process parameters detection is very important for the accurate control of the production process and ensure the production safety and efficiency [1], [2]. Z. Ji et al.: ECT Sensor Simulation and Fuzzy Optimization Design Based on Multi Index Orthogonal Experiment the sensitive field distribution and improving the quality of the reconstructed image. Based on the related concepts of fuzzy mathematics, this paper proposes a fuzzy analysis method of multi-index orthogonal experiment to comprehensively evaluate the performance of capacitive sensors, using COMSOL finite element simulation software to simulate, make the sensitive field distribution more uniform, and reduce the medium distribution Influence, the media distribution reconstructed from the capacitance measurement value can reflect the original image more accurately. The electrode plate i of ECT sensor is the excitation plate, and the electrode Plate j is the capacitance value when the electrode plate is detected, In the case of known potential distribution φ (x, y), it can be calculated from equation (6): Cij. where Uij is the potential difference between the plates. In order to make the sensitive field of ECT sensor more uniform, it is usually necessary to optimize the sensor parameters
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