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In order to overcome the technological difficulties encountered in the course of insulation fault diagnosis on the base of dissolved gases analysis, several kinds of mathematic models and actualized methods are brought forward to improve the reliability and veracity of fault diagnosis of transformers. The research works are shown mainly as followings:1 A modified fuzzy multi-criteria method is brought forward for insulation fault diagnosis of transformer. Furthermore, a new method for insulation fault diagnosis is proposed on the base of fuzzy multi-criteria together with rule reasoning. With fuzzy diagnosis in the method, fault reasons are filtrated and then the reasons in low probability are prohibited, Moreover, the left reasons are testified by using rule reasoning and then final concludes are drawn in much less misjudge probability and better results.2 On the base of geometry characteristics of C- partition to sample set of DGA data of transformer, a method is put forward to compute effective radius of neighbor field of a sample, number of clusters and values of initial centers. Moreover, the fuzzy C- means cluster model with adaptive weight is brought forward in the first time and then the fault classifier is designed for insulation fault diagnosis of transformer.3 According to the weakness of the degree of gray of gray incidence, a new formula to compute DGI is put forward and then incidence order criterion is ascertained. Moreover, a new DGI model for fault diagnosis is proposed according to the further analysis to relationship between fault reason and content of oil dissolved gases of transformer.
为解决在应用油中溶解气体分析方法(Dissolved Gases Analysis,简称DGA)诊断变压器内部绝缘故障时所遇到的主要技术难题,论文提出了用于提高变压器故障诊断准确性和可靠性的数学模型及实现方法,主要研究工作如下:1)提出了一种改进的变压器绝缘故障诊断模糊综合评判方法;进一步提出了将模糊综合诊断与规则推理相结合进行绝缘故障诊断的方法,该方法采用模糊推理对故障原因进行"过滤",滤掉可能性极小的原因,然后进一步利用规则推理验证剩下的可能原因,得出最终结论,大大减少了误判比率,获得了较好的效果。2)根据以变压器DGA数据为特征量的样本空间的c-划分几何特性出发,提出了一种求取样本有效邻域半径和聚类数及聚类中心初值的方法,在此基础上,首次提出了一种自适应加权的变压器绝缘故障诊断的模糊c-均值聚类模型,并设计出故障分类器。3)针对常用灰色关联度的不足,提出了一新的灰色关联度计算公式及确定关联序的准则;并在此基础上,通过深入分析变压器发生绝缘故障时的原因与油中溶解特征气体含量的关系,建立了一种新的故障诊断灰色关联模型;通过实例分析证明,该方法能有效地诊断出变压器绝缘故障及故障部位,大大提高了诊断的准确性。
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The main results of the study are obtained as follows:1 In order to analyze and study the physical and mechanical characteristics of Lianyungang marine soft clay deeply, large numbers of basic mechanical characteristics tests and tri-axial shear tests are completed.2 In order to investigate the loaded and failure characteristics of the cement-soil, the cement-soils for the different ratio and different cure time are studied in the laboratory, and their unconfined compression tests and tri-axial shear tests are performed.3 Based on the solution of one-dimension consolidation, the one-dimension consolidation of the double-layered foundation is solved for two-grade loading in virtue of transcendental equation; Simultaneously, the one-dimension consolidation of the double-layered foundation is solved by means of Laplace transform for two-grade loading, and Stehfest numerical transform is applied in Laplace's inverse transformation; Furthermore, according to the practical foundation shapes, the consolidation models of the soil between piles and the substratum are built and solved respectively.4 The effect of each parameters on the consolidation of the double-layered foundation is discussed, and the solution of load transfer method for double-layered foundation is applied in A1-A4 section of Lian-Xu expressway. The results of calculating settlement of the double-layered consolidation theory are basic agreement with the measuring settlement results.
取得了以下几方面的研究成果:1针对连云港海相软土进行一维固结和三轴剪切试验,深入分析连云港海相软土的物理力学特性。2模拟水泥土搅拌桩施工,在室内制备不同配比、不同龄期的水泥土试样,并进行无侧限抗压试验和三轴剪切试验,揭示水泥土的受力特性及破坏特性。3运用超越方程,以双层地基一维固结解析解为基础,推导出二级加荷条件下双层地基的固结解析解;同时,通过荷载传递法并借助Laplace变换对双层地基的固结问题进行了数值求解;此外,根据实际的地基结构,建立了桩间土和下卧层的固结模型并分别进行求解分析。4分析探讨了双层地基中各参数对双层地基固结的影响程度,并运用荷载传递法的解答计算了连-徐高速公路A1-A4标水泥土搅拌桩处理段的六个断面,计算结果与实测数据有较好的一致性。
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On the net collect summed up the following respects, offer text to receive the main page on the site repeatedly, according to website size, more or less can webpage numerary receive all pages repeatedly even; For every join provides a brief introduction, in order to hints this one's duty allows the person that visit is about which on one hand; Exceed in website map and text the mainest crucial term alludes inside join, the help searchs theme of page of join of engine identifying place is about which on one hand; Help engine indexes a few dynamic pages, because a few pages will be of dynamic generation, if not be user behavior is called,will not show come, can put this join on website map, in order to help the dynamic page with engine main index; To make website map attracts the visit of network spider, the descriptive sex statement with go up certain must be written to use this connective keyword to have simple description at the back of join, but the use keyword that cannot transfer, can be just the opposite to what one wished otherwise; Because general spider catchs page of before 3 class only, so website map makes the same score better more, what point to here is logical way, is not physical method.
在网上搜集总结了以下几个方面,提供文本连接到站点上主要的页面,根据网站大小,网页数目的多少甚至可以连接到所有的页面;为每个连接提供一个简短的介绍,用以提示访问者这部分内容是关于哪一方面的;在网站地图和文本超连接里面提及最主要的要害词语,帮助搜索引擎识别所连接页面主题是关于哪一方面的;帮助引擎索引一些动态页面,由于一些页面将是动态产生的,假如不是用户行为调用将不会显示出来,可以将此连接放在网站地图上,以帮助引擎索引重要的动态页面;为了使网站地图吸引网络蜘蛛的访问,一定要在连接后面写上一定的描述性语句并使用此连接的要害词进行简单描述,但不能过渡的使用要害词,否则会适得其反;因为一般蜘蛛只抓前三级页面,所以网站地图越平越好,这里指的是逻辑路径,而不是物理路径。
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In recent years begun to emerge in the international community for the Third World oppressed by the powers of the national service to the motherland in order to avoid unnecessary troubles brought about by China, has the potential to change the names of gangs were mercenaries, but still within the past in order to lock-in The title of contact with each other.
近年来在国际上开始崭露头角,为第三世界受列强压迫的国家服务,为了避免给祖国中国带来不必要的麻烦,遂改帮派名字为潜伏者佣兵公司,但内部照样以过去在绺子的称谓互相联络。
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Many researchers have devoted their work to the development of modal analysis extraction techniques in order to obtain more reliable identification of the modal parameters. There are many damping identification methods, but each one has different merit and defect. In order to find which one is the most reliable method with respect to certain characteristics, this thesis focus on how to identify structure's damping in time domain. The following works have been done in this thesis: 1. Investigate four modal analysis methods——the LSCE Method, the Ibrahim Time Domain Method, the Time Domain Collectivity Modal Parameter Method, the Rational Fraction Polynomial Method and improve on the ITD Method in arithmetic.
本文主要做了如下工作: 1、集中研究了四种常用的模态识别方法,即最小二乘复指数法、Ibrahim时域法、时域总体模态参数辨识法及有理分式多项式法,并对ITD法在算法上进行了一定的改进; 2、建立结构动力模型,利用这四种方法在具体条件下识别结构的阻尼,并绘制相应的图; 3、讨论不同的情况下,不同的识别方法对阻尼识别精确性的影响; 4、基于业已明确的阻尼识别的精确性,根据研究的需要,指出在实际的识别过程中,如何选择最佳的识别方法以及识别过程中需要注意的问题; 5、选择最为精确的阻尼识别方法,以导师李书进教授在日本京都大学防灾研究所强震反应实验室所做的一足尺木制结构房屋的动力测试实验为实测模型,识别其阻尼; 6、在本文的最后,尽作者所知,提出了一些需要改进的地方,并对未来的研究方向给出了作者的建议。
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Hastings' government was one whole system of oppression,of robbery of individuals,of spoliation of the public,and of super session of the whole sys-tem of the English government,in order to vest in the worst of the natives all the power that could possibly exist in any government;in order to de-feat the ends which all governments ought,in common,to have in view.
议员们,我长话短说只是提醒爵爷们,哈斯丁先生的政府是对个人和公众强取豪夺、与整个英国政府体制相背的实行压迫的完整体系,其目的在于把政府所能拥有的一切权力授予土著中最坏的人,并使一切政府通常应考虑的目标落空。
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Since the CPU is in the manufacture of semiconductor wafers in the silicon on the need for wires between the components to connect, due to state requirements in the high-frequency finer wires as short as possible in order to reduce stray capacitance wire interference distribution in order to ensure computing the correct CPU.
在台式机中,我们所说的超频,都是超CPU的外频(当然一般情况下,CPU的倍频都是被锁住的)相信这点是很好理解的。
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And an on-line adaptative training algorithm of the weights of neuron is given, which enhances fusion precision of the model, fault tolerance and adaptive ability for subsystems 4 In order to diagnose the soft fault of integrated system, a new fault detection method is proposed based on federated filter, which can detect fault of system in short interval and greatly enhance the method sensitivity to fault A fault diagnosis method of Dynamically Tuned Gyro baesd on parameter estimation of kinetics model of rotor, and signal pretreatment, parameter estimation and strategy of fault identification are studied in detail The method can locate fault of DTG correctly and effectively, which provides a new approach and idea for gyro fault diagonsis 5 In order to diagnose the hard fault of integrated system, fault tree analysis is studied on fault disgnosis of integrated system circuits, and the hardware and software of disgnosis system are developed, with faults located to main module and circuit For futhur diagnosis, an optimal measurement technology in detection of circuits is discussed by improving an algorithm based on information theory, and a pratical method based on half-split method is proposed.
针对组合系统的软故障诊断问题,提出了基于联合滤波模型的一种新的故障检测算法,给出了算法的理论推导过程,该算法能在较短的时间内检测出系统故障,提高了算法对故障的敏感度;研究了基于动调陀螺转子动力学模型参数辨识的故障诊断方法,就其中的信号预处理、参数辨识及故障决策方法等关键技术进行了详细的研究,该方法可以正确、有效地检测与定位动调陀螺故障,为陀螺故障诊断提供了新的途径和思路。 5。针对组合系统的硬故障诊断问题,研究了基于系统浅知识推理的故障树法在组合系统电路子系统故障诊断中的应用,开发了相关诊断系统的软硬件,故障可定位到系统的主要功能模块和电路板级。为了进一步的故障定位,研究了电路板故障的最优检测问题,完善了基于信息理论的优化算法,并提出了基于&对分法&的一种实用的优化算法,故障可定位到电路板的主要功能元件级。在组建的SINS/GPS组合系统实验平台上,针对上述研究内容,进行了大量的实验研究。
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Was established in October 8, 2005 to Coix plantation-based, technology platform for industrial processing in order to export as the goal, the longitudinal development of Coix Product horizontal to farmers, in-depth expansion of sales channels, realize Without Borders three-dimensional chain operators, in order to ensure long-term development of the strategic objectives of the company, with three to five years, build the company as industry, academia, research synthesis, agriculture, industry, Branch, trade as one of the large modern, large-scale, international transnational groups.
沈阳天谷农业科技开发有限公司成立于2005年十月八日,以薏苡种植为基础,以工业加工为技术平台,以出口创汇为目标,纵向开发薏苡产品横向到农户,深度拓展销售渠道,实现无国界的立体经营链,为保证公司长期发展战略目标,用三到五年的时间,把公司建设成为产、学、研综合,农、工、科、贸为一体的大型现代化、规模化、国际化的跨国集团。
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In order to preserve the varieties of the swarm and avoid to be in premature convergence,a Particle Swarm Optimization algorithm based on the differential evolution mutation is proposed.The new algorithm uses the particle aggregation quality to judge that if the particles in the swarm are congregative so much,then apply the differential evolution to mutate the self prevenient best position of each particle,in order to realize the aim of preserving the varieties of the swarm.
为了保持粒子种群的多样性而避免发生&早熟&的问题,提出一种基于差异演化变异的粒子群优化算法,该方法通过粒子聚集性判断如果粒子群中的粒子过于聚集,则使用差异演化算法对PSO算法中各个粒子的自身历史最佳位置进行变异,以实现保持粒子群种群多样性的目的。
- 推荐网络例句
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The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.
采用不同浓度K2CrO4(0,0.4,0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗,测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。
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By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.
通过分析数学形态学在图像中的理论基础,研究二值图像的形态分析算法,探讨最小结构元素的两种基本形态:膨胀和腐蚀;分析了数学形态学复杂算法的基本原理,把数学形态学的部分并行处理理念引入到家实际应用中。
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Have a good policy environment, real estate, secondary and tertiary markets can develop more rapidly and improved.
有一个良好的政策环境,房地产,二级和三级市场的发展更加迅速改善。