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At the same time, combining with the actual condition of delivery pipeline of our country and some prevalent leak detection and location methods, this paper raised a method, which is based on wavelet analysis and negative- pressure-wave to detect and locate the leakage. Jobs in the paper are as follows:As affected by gas density, pressure, specific heat and pipe material, the velocity of negative-pressure-wave improved depending on the energy conservation. At one time, taking the affection of velocity of gas flow, the location formula was modified in some degree.When locating the leaks with location formula, the iterative approach algorithm was adopted as a new method to increase the location accuracy level of system.Multi-scale decomposition and reconstruction of wavelet transform is utilized to filter the noise of negative-pressure-wave, which was brought by leakage. With the capacity to detect the signal singularity fast and accurately, wavelet transform was used to catch the break point of pressure signal. The work improved the accuracy of At in location formula, accordingly improved the location accuracy.Wavelet is a suitable tool for signal analysis. The distinct character is that the mother-wavelet is of optional. That means choosing different mother-wavelet will get different analysis result. So we studied how to choose mother-wavelet and its scale for signal singularity detection. The method is to choose a wavelet by regularities of the wavelet and the signal.Finally, a plan, which bases on SCADA system for inspection and detection of natural gas leakage, is proposed in the article.
其中,主要进行了以下几方面的工作:针对泄漏产生的负压波在管道中的传播速度受媒介的密度、压力、比热及材质等因素的影响,而非声波在空气中传播的速度,本文利用能量守恒原理,对其进行了修正;考虑到管内气体流速对压力波速的影响,对原始的负压波定位公式进行了一定程度的改进,并在利用定位公式进行泄漏点定位时采用逐步迭代逼近算法,提高了系统的定位精度;利用小波变换的多分辨率分解和重构技术,对采集到的管道发生泄漏时产生的负压波信号进行了降噪处理;并利用小波变换技术对信号奇异点的快速、准确的识别能力,对经上述消噪后的负压波信号进行了奇异点捕捉,精确捕捉的结果提高了定位公式中上下游站点采集到的负压波奇异点的时间差△t的精度,从而进一步提高了定位的精度;考虑到小波变换是一种基波可变的信号分析工具,也就是说,不同的小波基波对信号分析的结果将有很大差别,这势必影响最终的处理结果,因此,我们又对比分析了本课题中小波基及尺度的选择问题,依据规则性系数相似性原理对母小波的选择进行了探索性研究;最后,还提出了基于SCADA的泄漏检测与定位系统的软件开发构想及系统的嵌入方案。
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The process of magmatic generation (namely migmatization and granitization)is the first step of undergoing formation of all granitoids.However only,some granites formed in the early period of geological history or the specified tectonic environment can preserve characte-ristics of migmatization and granitization in some degree.
岩浆的发生过程是所有壳型花岗岩类形成所必经的第一步,但往往只是一些在地质历史早期或特定的构造环境下形成的花岗岩才不同程度保留混合岩化、花岗岩化的特征。
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Therefore, in some sense, homogenesis and globalization are two purposes in the development of consumption culture. They can bring some negative effect in some degree with their entanglement.
因而,从某种意义上说,同质性与全球化是消费文化发展的两个未来向度,并且这两者又同时纠结在一起的,而且还会产生出一定程度上的负效应来。
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Especially, just direct mechanical intermix can in some degree induce fragmentation of clay particles to form some nanodimension dispersed particles.
直接混炼也会造成粘土晶层一定程度的剥离,从而在基质中产生一些纳米尺度的分散质。
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In some treatments the content of nicotinamide was decreased in some degree.
这可间接说明,经菌株及其代谢产物处理的烟叶,挥发性物质种类与含量显著增加,其作用强度与酶活性增强存在着相关性。
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Although it can not solve the security problem fundamentally, it can overawe criminal in some degree,and it may provide some important clue after things happened.
虽然说不能根本上去解决安全问题,但是对犯罪份子有一定的威慑作用,更重要的是能够借助录像资料多提供了线索。
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Though Quine's view of compromising can avoid in some degree the difficulties the realists and the conventionalists have,but there are also some problems to solve.
奎因的调和论在一定程度上可以避免实在论与约定论观点的困难,但仍然存在一定问题和尚需进一步说明的地方。
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DSA displayed stricture or obliteration of ICA in hemi or bilateral,some cases incorporated vertebrae basilar artery pathology also,all cases displayed abnormity vasoganglion in some degree.
DSA造影显示一侧或双侧颈内动脉系统的狭窄或闭塞,部分病例尚合并椎-基底动脉病变,所有病例均有不同程度的异常血管网形成。
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With the greater demand of sulfureted antimony slag for market, the slag was become more and more after the process of selecting and smelting mine, whereas, the most slag freely placed wasn't disposed and treated in some degree. Meanwhile, there were some sulphur and valuable metals in the slag.
随着市场对硫化锑矿石的需求量越来越大,选矿之后和冶炼后产生的矿渣也越来越多,大多数矿渣随处堆放未作处理和治理,另外矿渣中含有一定的硫磺和贵重金属资源。
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Charlotte Bronte"s novel jane Eyre come up to exceed novel"s tradition on the aspect of contene and form. The novel seems apparent and uniform, but it can display a multiplex world , it also turn into a classical in West literature. In every era, reachers discuss it from different view and different way. Generally, reachers focus on the heroine Jane Eyre, the novel becomes the model of monologue novel in the viewpoint , of Mikhail Bakhtin. Meanwhile, another character Bartha Mason turn into a recessive existence , in the grow up of feminism, Bartha Mason be concerned in some degree, but she is a foil in some views.
夏洛蒂·勃朗特的小说《简·爱》在内容和形式层面,都达到了对小说传统的超越与反叛,小说在一个看似统一的表层之下张扬着一个多元的世界,成为西方文学中的经典文本,历代对它的研究从不同的视角以不同的方式展开,不论做什么层面的解读,常将关注点聚焦于主人公简·爱,小说也成为巴赫金意义上的&独白型&小说的典范,而另一人物伯莎,成为隐性的存在,在女权主义的兴起中,伯莎得到一定关注,但依旧被作为简·爱的陪衬。
- 推荐网络例句
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Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".
歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车,和一双合并为一移交&整个lotta爱&。
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This is Kate, and that's Erin.
这是凯特,那个是爱朗。
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Articulate the aims, objectives and key aspects of a strategic business plan.
明确的宗旨,目标和重点战略业务计划。