基于多元立体阵列的炉管泄漏声学监测及定位研究

发布时间：2018-01-18 04:22

本文关键词：基于多元立体阵列的炉管泄漏声学监测及定位研究　出处：《华北电力大学(北京)》2014年硕士论文　论文类型：学位论文

【摘要】：由于电站锅炉过热器和再热器等管道存在蠕变、过热、腐蚀疲劳、磨蚀以及焊接问题等因素影响,容易导致管道泄漏的发生,严重影响了电站锅炉的经济、安全运行,因此及时监测、定位泄漏位置将对电厂安全经济的运行起到了重要的作用。由于应用于炉管的声学定位技术研究较少,选取蜂窝网络定位技术、麦克风阵列技术等定位技术中几种运用广泛的定位算法,如Fang、Chan、 Taylor算法等,比较其优缺点,并对其在三维空间进行拓展。在基于多元立体阵列的情况下,通过计算机仿真比较了Chan算法与Chan协同Taylor算法,并且验证了Chan协同Taylor定位算法在三维空间泄漏定位的可行性。之后,介绍了几种时间延迟估计的方法,并针对锅炉的特点,选取自适应时延估计来进行深入研究,提出了一种结合变换域以及变步长的改进算法,利用Matlab对其参数选取进行研究,并且通过仿真锅炉低信噪比环境下比较研究分析了改进算法与其他LMS算法的性能。将Chan协同Taylor定位算法与改进LMS时延估计算法结合起来,利用Matlab编程语言中的GUI用户图形界面,开发了一套基于多元立体阵列的“电站锅炉炉管泄漏声学定位系统”,并且对该系统的硬件、软件作出详细的介绍,对系统界面的操作以及能够实现的功能做了详实的介绍。
[Abstract]:Due to the influence of such factors as creep, overheating, corrosion fatigue, abrasion and welding problems in the superheater and reheater of power plant boiler, it is easy to cause pipeline leakage, which seriously affects the economy of power plant boiler. Safe operation, so timely monitoring, location of leakage location will play an important role in the safe and economic operation of power plants. Because of the less research on acoustic positioning technology used in furnace tubes, the selection of cellular network location technology. Several widely used localization algorithms such as microphone array technology, such as Fang Chan, Taylor algorithm, etc., are compared with their advantages and disadvantages. In the case of multi-dimensional array, the Chan algorithm and Chan cooperative Taylor algorithm are compared by computer simulation. The feasibility of Chan collaborative Taylor location algorithm in 3D leak location is verified. Then, several methods of time delay estimation are introduced, and according to the characteristics of boiler. Adaptive time delay estimation is selected for further study, and an improved algorithm combining transform domain and variable step size is proposed, and the parameter selection is studied by using Matlab. The performance of the improved algorithm and other LMS algorithms are compared and analyzed through the simulation of boiler in low signal-to-noise ratio environment. The Chan cooperative Taylor location algorithm and the improved LMS time delay estimation algorithm are combined. Come on. By using the GUI user graphical interface in Matlab programming language, a set of "acoustic location system for boiler tube leakage in power station" based on multi-dimensional array is developed, and the hardware of the system is also discussed. The software is introduced in detail, the operation of the system interface and the functions can be realized are introduced in detail.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM621.2

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