【作者】 孙江丽；

【导师】 马昕；

【作者基本信息】 北京化工大学 ， 控制科学与工程， 2011， 硕士

【摘要】 自动化仪器仪表在现代化工业生产中占有非常重要的地位,仪器仪表选择的好坏是衡量自动化水平的重要指标之一。对于一个合格的自动化过程工程师而言,不仅需要具备有研究各类仪器仪表的输入输出特性和故障分析的能力,还需要掌握常用的仪器仪表选型技术。然而目前而言,国内自动化过程工程师的教学有些理论偏离实际,很多过程工程师不具备有将仪器仪表的理论研究和实际工作相结合的能力。为了较好的解决上述问题,本课题对常用的自动化仪器仪表进行了机理分析和动态仿真建模,同时收集了国内主要厂家自动化仪表的产品参数,建立了比较全面的自动化仪表产品数据库,编写了仪表自动选型软件。课题研究的自动化仪表包括调节阀、压力传感器、温度传感器、流量传感器和物位传感器。本课题具体研究内容及研究成果如下：1)常用自动化仪器仪表的机理分析和动态仿真建模工作,包括建模目的提出、建模及仿真思路的分析、建模机理的研究以及针对机理进行建模等四个方面内容；2)仪表仿真采用C++编程语言实现,程序响应速度快,可移植性好。本课题所采取的设计模式为建造者模式,依据所建立的数学模型进行UML设计,模型包括用例分析、时序图以及设计图三方面内容；3)搜集了国内主要厂家部分自动化仪表的产品数据,建立了产品数据库,并提供产品检索、添加和删除信息功能；4)借助虚拟仪器的思想对仪器仪表进行界面及曲线实现,包括正常参数传递、曲线输出、仪器自定义和调节阀故障分析等环节；5)编写了仪表自动选型软件,将仪表仿真模型和产品数据库进行链接。通过选择可配置参数,用户可以在相同工况下进行了对不同厂商同类型仪器的仿真曲线进行对比,极大的方便了仪器仪表选型工作,提高了自动化过程工程师的工作效率。更多还原

【Abstract】 Automatic instruments play a very important role in modern industry, and the performance of instrument selection is one of critical indicators to judge the level of automation. The basic requirement for a qualified engineer includes knowledge about connection between input and output and failure analysis, common instruments selection techniques. However, so far as we can see, the teaching method for domestic automation engineers deviate from practice, and performance to combine theoretical study to practical instrument selection does not meet requirements.To find the solution of these problems above, I spent a lot of time on mechanism analysis and dynamic simulation modeling for automatic instruments, collecting domestic instrument product information, established database for automatic instruments and program application for instrument automatic selection.Automatic instruments in the research includes regulate vales, pressure sensors, temperature sensors, flow sensors and level sensors.The specific research contents and research result as follows: 1) Mechanism analysis and dynamic simulation modeling for common automatic instruments, including the solution for modeling, mechanism analysis and model simulation and so on;2) Model simulation for instrument was implemented with C++, whose advantage includes fast response and better transplantation. Design pattern as construction mode created UML with mathematical models, and models was built on case analysis, sequence and design diagram;3) Collecting automatic instruments from major domestic manufacturers, building product database for user search, add or delete information function.4) With virtual instrument design method, I engaged model simulation on automatic instrument, including normal parameters analysis, curve output and control valve fault simulation analysis.5) Instrument automatic selection application was completed for link simulation models and product database. By parameters configuration, user will get simulation curve from different products. It will facilitate user to select the most appropriate instrument and be benefit to improve efficiency for automation engineers.更多还原