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The main causes of the vibration in pipeline system are in two respects : The first is the vibrant force of the medium acted on pipeline system,i.e.exciting signal,such as the vibrant force caused by the gas flow at the compressor ′ s inlet and outlet and at the ramified and nodel points as well as the action of pig passing through pipeline bridge,etc.;The second is the response to the exciting signal,which is relating to the characteristics of the pipeline system,i.e.the rigidity,support,quality and equipments of the system besides the waveform of the exciting signal.

管道系统振动的原因主要有两方面,一是介质对管道系统产生的振动力,即激发信号,如气流在压缩机进、出口,分支节点部位产生的振动力,清管器通过管桥时对它的作用等;另一方面是对激发信号的响应,其响应除了和激发信号的波形有关外,还和管道系统本身的特征,即系统的刚度及支撑,质量及其配置等情况有关。

There are some key technologies, such as knowledge library, ratiocinative mechanism, learning mechanism, expository mechanism, database and the inter-importing mechanism of neural network and expert system in this intelligent fault diagnosis system. The knowledge library, ratiocinative mechanism and learning mechanism all consist of neural network and expert system, and they should be treated separately.

本智能故障诊断系统有知识库、推理机制、学习机制、解释机制、数据库以及神经网络与专家系统的相互导入机制等关键技术,其中知识库、推理机制和学习机制都包括神经网络与专家系统两个部分,需分别对待。

In this paper,we define the oriented relevance information among attributes of information and decision systems,which measures the relevance among attributes of information and decision systems. And based on these definitions, we present a new discriminant theorem of knowledge reduction of information systems.

本文定义了信息系统以及目标信息系统属性之间的有向关联信息,用来度量信息系统以及目标信息系统属性之间的关联程度,基于此给出信息系统以及目标信息系统的知识约简一种新的判定定理。

Several experimental applications have been developed finally. In this paper, there areinnovations from the following four aspects:1. Definition and research methods of current distributed system and distributedinteractive simulation system follow those of traditional parallel computing system.While this paper points out it is one-sided to measure the scalability just from thenumber of processors and performance of a system, because the resources of distributed systems are heterogeneous and they can be used in diverse applications. Inthis paper, scalability of distributed interactive simulation platform is defined as theability of scaling (including scale-up and scale-down) in functionality and performanceof systems which is run on the platform when number of processors and otherhardware resources such as network change, i.e. when problem size is scaled up and system resources is increased, the performanceremains fixed and it is easy to expand the functions of simulationapplications.

本文的创新工作主要体现在下述4个方面:1、现有的分布式系统和分布式交互仿真系统可扩性的定义和研究方法都沿用了传统的并行计算系统可扩性的定义和研究方法,本文指出分布式系统的系统资源异构多样、应用种类丰富多样,只从传统方法采用的处理机资源和性能角度衡量一个系统是否可扩是有一定的片面性,提出了分布式交互仿真平台可扩性的定义是在处理机和网络等系统资源变化时,运行在平台上的分布式交互仿真系统在性能和功能方面发生扩缩的能力,即当问题规模扩大时,增加系统资源,系统能获得指定的性能及在功能方面能方便进行扩充。

The research work of this paper is divided into five parts: The first ,according to the work characteristics of ship's auxiliary boiler, this paper is to design applied project in the automatic control system of ship's auxiliary boiler; The second, according to the work request of the cargo winch of alternating three-speed change-pole speed-adjusting, this paper is to determine adopting the method of the PLC control; The third, this paper is to design PLC application in three -phase induction motor control, to give the ladder chart, program and input and output circuit diagram; The fourth, this paper is to research the method of the ship's combined starting screen automatic control with the PLC; The fifth, this paper is to inquire the possibility of apply the PLC in ship's engine room surveillance system; According to the comprehensive analysis of above actual example of ship's auxiliary machinery automatic system with the technique of PLC; not only can use the technique of PLC to replace traditional relay-contactor control technique in ship's auxiliary machinery automatic system, but also can get the conclusion of the former is more dependable and more clever than the latter, the maintenance is more convenient, thus develop a new path for ship automation.

本文研究的工作主要包括五个部分:第一,根据船舶辅锅炉的工作特点,设计PLC在船舶辅锅炉自动控制系统中的应用方案,主要有PLC选型及输入输出点的设计,画出系统控制梯形图并分析工作原理;第二,根据交流三速变极调速起货机的工作要求,确定采用PLC控制的方法,进行控制系统的硬件设计和软件设计,并分析工作原理:第三,设计了PLC在三相异步电动机控制中的应用,给出了控制梯形图、程序及输入、输出接线图;第四,研究了用PLC实现船舶组合起动屏自动控制的方法,进行了系统的电源设计和软件设计,给出系统工作流程图;第五,探讨了船舶机舱监视系统应用PLC的可行性,将继电器报警线路改为用PLC控制报警,给出系统硬件图和软件梯形图,并分析了PLC机的选型、抗干扰和应用PLC的经济效益和社会效益等问题。综合以上船舶辅助机械自动控制系统采用PLC技术的实例分析,可以得出船舶辅助机械自动控制系统不但可以使用PLC技术取代传统的继电器接触器控制技术,而且前者比后者更可靠、更小巧,维护保养更方便的结论,从而为船舶自动化开辟了一条新的路径。无忧毕业设计网 www.5ubs.cn

In addition to the installation of concrete pump truck on the electrical control system to complete control tasks, but also installed a manual control system manipulation, it is also part of the control system.

混凝土泵车上除了安装电气控制系统以完成控制任务之外,还安装有手动控制操纵系统,它也是控制系统的一部分。

For the models by MMFI is a nonlinear differential equation with variable coefficients and the 'nonlinearity' brings discommodiousness to analyse the nature and quantification of a control system, it applies brim linearization method to better MMFI. By transforming 'triangle wave' membership functions of the base elements into 'rectangle wave' membership functions, we get three models which represent different aspect respectively. By simulating second order system and analysing the errors of the results, a conclusion is drawn, that is, the model obtained by brim linearization method has a good precision in contrast with the real model.

由于模糊推理建模法得到的模型是变系数非线性微分方程,这种&非线性&对该控制系统的某些定性或定量分析带来不便,因此应用边缘线性化方法对模糊推理建模法进行改进,将基元的隶属函数由&三角波&改成&矩形波&,从而得到了三个模型,这三个模型各有侧重,通过对二阶系统进行仿真,分析仿真结果,从而给出了关于边缘线性化方法的结论,即由边缘线性化方法得到的系统模型对该系统的真实模型有较高的逼近精度。

As the first road and city traffic specialty for master degree, this specialty lie the advanced level among the similar specialties and began incept students from 2000. There are 5 research directions of intelligent road traffic control and management, intelligent traffic information system, traffic programming and management, traffic environment and security, traffic system modeling and stimulation. With the stability theoretic knowledge and abundant practice experience, all graduates with master degree have the opportunity to go to study for doctoral degree, or to do work in these aspects of intelligent traffic, traffic engineering design, transportation programming, traffic control development, traffic establishment construction and so on.

本专业自2000年开始招生,是华南地区最早的以公路交通和城市道路交通为研究对象的硕士专业,处于国内同类专业的先进水平,先后开设有智能道路交通控制与管理;智能交通信息系统;交通规划与管理;交通系统建模仿真;交通环境与交通安全等研究方向,培养的学生既有扎实的专业基础理论知识,又有丰富的工程实践经验,能在国家与省、市的交通其相关部门从事智能交通、交通工程设计、交通运输规划、交通监控系统开发、交通基础设施建设等领域工作或进入博士阶段学习,得到用人单位重用和社会的好评。

As the first road and city traffic specialty for master degree, this specialty lie the advanced level among the similar specialties and began incept students from 2000. There are 5 research directions of intelligent road traffic control and management, intelligent traffic information system, traffic programming and management, traffic environment and security, traffic system modeling and stimulation. With the stability theoretic knowledge and abundant practice experience, all graduates with master degree have the opportunity to go to study for doctoral degree, or to do work in these aspects of intelligent traffic, traffic engineering design, transportation programming, traffic control development, traffic establishment construction and so on.

本专业自2000年开始招生,是华南地区最早的以公路交通和城市道路交通为研究对象的硕士专业,处于国内同类专业的先进水平,先后开设有智能道路交通控制与管理;智能交通信息系统;交通规划与管理;交通系统建模仿真;交通环境与交通安全等研究方向,培养的学生既有扎实的专业基础理论知识,又有丰富的工程实践经验,能在国家与省、市的交通及其相关部门从事智能交通、交通工程设计、交通运输规划、交通监控系统开发、交通基础设施建设等领域工作或进入博士阶段学习,得到用人单位重用和社会的好评。

And human resources information's management is many factories and mines, the company, an individual Institution's major problem, if depends on the human, the work load will be very big, if the company population has tens of thousands are even more, the artificial statistics will become cannot imagine, but if depends on the computer, only some simple operations then may prompt, obtain the information which accurately needs, therefore develops a human resources information management system management system is also essential, the human resources information management system management system mainly includes to the human affairs information statistics, the inquiry, the renewal and so on, this paper has manifested the database application system's characteristic, enables the system to have the security, data sharing, the transposability.

其中人才信息的管理是很多厂矿、公司、个体事业单位的一个大问题,如果靠人,工作量将很大,若公司人数有几万甚至更多,人工统计将变得不可想象,但如果靠计算机,仅一些简单的操作便可及时、准确地获得需要的信息,因此开发一个人才信息管理系统也是必不可少的,人才信息管理系统主要包括对人事信息的统计、查询、更新等,该论文体现了数据库应用系统的特征,使系统更具有安全性、数据共享性、可移置性。

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推荐网络例句

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸,那乌黑、忧郁的眼睛,她便会相信,他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失

But because of its youthful corporate culture—most people are hustled out of the door in their mid-40s—it had no one to send.

但是因为该公司年轻的企业文化——大多数员工在40来岁的时候都被请出公司——一时间没有好的人选。