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信号奇异性检测在输气管线泄漏检测中的应用 总被引:7,自引:0,他引:7
对小波变换的基本理论进行了简要的阐述,特别是信号奇异性检测。并以天然气管道泄漏后获得的相关信号为对象。利用小波分析方法来分析信号的奇异性及奇异性位置,从而应用到天然气管线泄漏检测中,仿真实验证明了该方法对管道泄漏诊断的精度,同时也显示出小波在滤波、定位等方面的优越性。 相似文献
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基于输气管线的物理模型,结合负压波幅值沿管线近似指数衰减的机理提出了一种用于评估输气管线泄漏监测与定位系统性能的指标--最小可检测泄漏量的方法,同时也推导出了输气管线敏感点的数学表达式.通过实际数据仿真分析了管线的负压波衰减因数、泄漏点、仪器精度与噪声等对最小可检测泄漏量与敏感点的影响,其结果为泄漏检测与定位系统的性能指标,如灵敏度、评估能力等给出了理论指导,使得以前只能定性分析的问题,可以定量进行研究. 相似文献
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本文分析了一种用于油田管线参数综合检测的仪表的设计方法。该仪表突破了以往方法中对参数分别检测与显示的弱点,使系统成本大大降低。系统主体由Inte19808单片机与PSD311可编程外围接口器件构成,设计新颖,结构简单,从而具有高的可靠性. 相似文献
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2000公里输气线的物联网之道。5月11日凌晨2时,陕京输气管道的榆林压气站巡检员赵永辉(化名)拿着PDA移动终端,到场站里溜达了一圈,所有压缩机的运行参数旋即通过PDA系统传到了局域网系统里,而他要做的是每隔两小时准时巡检场站一次,而巡检一次仅需不到5分钟。 相似文献
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本文基于分布参数系统的控制理论,清晰地表达了声场有源控制所涉及的控制对象、控制系统和性能指标间的关系,导出了控制系统设计所要满足的稳定性条件和消声条件,给出了目标消声处局部区域声场的干涉结果,为研究有源消声的实际效果提出了依据。 相似文献
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通过地理信息系统技术的运用,实现对电信管线高效的管理与维护。本文详细阐述了系统开发技术及主要功能并给出关键问题的解决方法。 相似文献
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在天然气输气管道工程中,紧急切断阀通常选用气液联动执行机构,但其结构复杂、价格昂贵;紧急放空阀常采用电动执行机构,但其在安全性方面存在不足。因此,有必要为安全仪表系统(SIS)阀寻找满足功能安全、结构简单并节省投资的其他类型执行机构。通过与气液联动执行机构、电液联动执行机构、气动执行机构及电动执行机构的性能和经济性比较,介绍了管道气直驱执行机构和其他类型执行机构的适用场合,并阐述了管道气直驱执行机构的概念、分类和应用情况。通过分析,得出了对于天然气管道工程中口径16英寸(1英寸=25.4 mm)或16英寸以下的紧急切断阀,管道气直驱执行机构更为适用的结论。这为以后的天然气长输管道工程中执行机构类型选择提供了参考和指导。 相似文献
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A model–based engineering diagnostic method is typically based on the evaluation of the residuals generated from a comparison of important variable values from a simulated system and the corresponding measured values from the system's performance. Consequently, a model should describe the dynamic behaviour of the system as accurately as possible using suitably selected parameter values. This implies the need for validation of the performance of the model by comparison with the measurements of the actual system. This process is especially important when the detection of faults is performed in real–time conditions. In this paper, the modelling process for hydraulic systems as well as a new parameter validation method that has been developed using the DASYLab data acquisition and control software for the estimation of the uncertain parameter values of the model is presented. This model validation process led to the establishment of a model–based expert system that is able to diagnose real–time faults working in parallel with actual dynamic industrial automated processes. 相似文献
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Sava Krsti Robert B. Jones John O'Leary 《Electronic Notes in Theoretical Computer Science》2007,174(8):7
We present a method for pipeline verification using SMT solvers. It is based on a non-deterministic “mother pipeline” machine (MOP) that abstracts the instruction set architecture (ISA). The MOP vs. ISA correctness theorem splits naturally into a large number of simple subgoals. This theorem reduces proving the correctness of a given pipelined implementation of the ISA to verifying that each of its transitions can be modeled as a sequence of MOP state transitions. 相似文献
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Automatic View Selection Using Viewpoint Entropy and its Application to Image-Based Modelling 总被引:3,自引:0,他引:3
Pere-PauVázquez MiquelFeixas MateuSbert WolfgangHeidrich 《Computer Graphics Forum》2003,22(4):689-700
In the last decade a new family of methods, namely Image‐Based Rendering, has appeared. These techniques rely on the use of precomputed images to totally or partially substitute the geometric representation of the scene. This allows to obtain realistic renderings even with modest resources. The main problem is the amount of data needed, mainly due to the high redundancy and the high computational cost of capture. In this paper we present a new method to automatically determine the correct camera placement positions in order to obtain a minimal set of views for Image‐Based Rendering. The input is a 3D polyhedral model including textures and the output is a set of views that sample all visible polygons at an appropriate rate. The viewpoints should cover all visible polygons with an adequate quality, so that we sample the polygons at sufficient rate. This permits to avoid the excessive redundancy of the data existing in several other approaches. We also reduce the cost of the capturing process, as the number of actually computed reference views decreases. The localization of interesting viewpoints is performed with the aid of an information theory‐based measure, dubbed viewpoint entropy. This measure is used to determine the amount of information seen from a viewpoint. Next we develop a greedy algorithm to minimize the number of images needed to represent a scene. In contrast to other approaches, our system uses a special preprocess for textures to avoid artifacts appearing in partially occluded textured polygons. Therefore no visible detail of these images is lost. ACM CSS: I.3.7 Computer Graphics—Three‐Dimensional Graphics and Realism 相似文献
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肖蕾 《自动化与信息工程》2013,(4):25-30,39
基于浏览器/服务器架构,结合GIS、WEB、定位和数据库等技术,针对地下管线巡检、维修和抢险工作的特点,设计一套地下管线巡检维护管理系统。该系统改变了地下管线巡检工作的传统方式,大大提高管理质量和效率,为地下管网安全运营提供有力的技术保障,适用于市政工程行业对地下管网及其附属设施的日常维护和管理,具有广阔的应用前景。 相似文献