两相流论文ECT系统图像重构算法研究.docVIP

两相流论文：ECT系统图像重构算法研究 【中文摘要】ECT (Electrical Capaciantce Tomography)技术是过程层析成像PT (Proce ss Tomography)技术的一种。该技术具有非侵入式的测量方式、价格低廉、响应快等优点。近一个时期以来,ECT技术表现出了很大的发展潜力和很好的工业应用前景。图像重构算法是ECT系统能否成功应用的关键环节,同时也是改善图像重构质量的重要途径。重构图像的过程就是借助若干个测量数据(电容测量值)去重构被检测区域内部介质的分布图像,从而得到整个成像区域内不同介质的分布情况。本论文以图像重构算法为研究重点,以12电极ECT系统为研究对象,通过使用有限元方法获得原始数据对系统进行建模与仿真。本文的主要工作有：1.在阅读相关文献的基础上,对两相流的概念、两相流分类和两相流要检测的主要参数进行分析和归纳,为两相流的检测提供依据。2.分析了电容成像系统的组成及工作原理,在介绍ECT图像重构算法的数学原理和意义的基础上,对常用的几种图像重构算法作了分析和比较,得到了一些有关算法选择的结论。3.在研究图像重构遗传算法的基础上,给出了一种改进的图像重构遗传算法,运用ANSYS仿真软件提取电容值,将改进遗传算法重构图像与其他算法的重构效果进行了比较,结果表明了改进算法的有效性。 【英文摘要】Electrical Capaciantce Tomography (ECT) technique is a kind of process Tomography (PT) technique based on electrical capacitance sensors.ECT technique has the advantage of being non-intrusive, simple in structure, fast in response, low in cost, wide in application and good in secutity (non-radiation).ECT has gained considerable progress in recent years.As a new technology of two-phase flow parameters detection, ECT has great development potential in the in dustrial application.Image reconstruction algoirthm is an important factor to improve the image reconstruction quality in ECT system research.It reconstructions the medium distribution image of the measured area by limited observation data (measured capacitance data), same as finding the distribution of medium constant of substance in every unit.This dissertation is based on the study of 12-electrode electrical capacitance tomography system.The main work and researching result of this article is as follows:Firstly, By reading a lot of references, the concept, sorts and major detection parameters of two-phase flow is analyzed and concluded.Also the significance for scientific research and industry production is pointed out.Secondly, the principle of the capacitance tomography is analysed and mathematics principle of image reconstruction algorithm is also introduced.Thirdly, introduce several ECT image reconstruction algorithms,analyse and compare t