Three Dimensional Dynamic Tracing Study Of Loose Parts In Nuclear Power Plant

In order to guarantee the safe operation of nuclear power plant,nuclear power plant loose parts monitoring system is particularly important.But current nuclear power plant monitoring system are stay in 2 d according to monitoring results,people can't observed falling loose parts dynamically inside the plant in 3 d.According to the Major National Science and Technology Program " Research on the Prototype of Loose Part Ponitoring in Puclear Power Plant(No.KYZ193612003)" and " Public Tehnology and Social Development Project in Zhejiang Province(No.2012C23017)",the paper research the study of loose plant parts drop 3 d dynamic tracking,and propose "plant loose parts tracing research in 3 d dynamic" as master degree thesis research topic.In chapter one: this paper introduces the background and significance of the plant loose parts tracking in 3 d dynamic.Introduces the development and research status of LPMS and three dimensional dynamic display technology,and then introduces the necessity of three dimensional dynamic display for loose parts monitoring system in nuclear power plants,summarizes the research background and the content in this paper.In chapter two: explain the surface impact experiment and boiler background noise acquisition process.Complete platform building,the experiment data collection,analysis of the background noise signal of boiler,facilitate validation and comparison of surface localization algorithm provides data base.In chapter three: this chapter describes the existing localization algorithm,by theoretical comparison,put forward a kind of CWT(continuous wavelet transform)based the Hilbert Hilbert envelope arrived time localization algorithm.Upon arrived time localization algorithm simulation analysis,respectively compared localization of noiseless and add noise signal.The analysis shows that: the Hilbert envelope arrived time difference location algorithm based on CWT has high positioning accuracy,strong ability to resist noise and stable positioning,etc.In chapter four: use LabVIEW graphical programming language to write accumulation method based on wavelet transform,root mean square method based on wavelet transform and Hilbert envelope method based on wavelet transform method introduce the method process,write procedures look-up table method and implementation process.TDOA location method positioning method combined with the look-up table method building up loose parts positioning analysis systems of nuclear power plants Through simulation experiment results,Hilbert envelope arrived in time difference grid localization algorithm based on CWT is effective.In chapter five: the plant loose parts 3 d dynamic tracking shows that the software structure of simulation system.The selection of software development platform for the software and the overall design thought,three-dimensional model is established for Solidworks software,LabVIEW as the development platform,overall design contains functional design,database design and interface design.3 d modeling process and development platform combined with the production process,good 3 d model will be built into surface positioning platform and integrated plant loose parts 3 d dynamic display monitor system.That accurate positioning of the system at the same time,still can real-time image observed falling loose parts grid position display and record the process of falling,a loose parts falling trajectory,provide the basis for scientific diagnosis.In chapter six:for the paper,summarized the research and the results of that progress,as well as looking after the direction of research prospects,illustrate the insufficient of the research.