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智能阀门定位器论文:基于PROFIBUS-DP智能阀门定位器研究

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智能阀门定位器论文: 基于 PROFIBUS-DP 智能阀门定位器研 PROFIBUS智能阀门定位器论文: 究

【中文摘要】随着社会的不断进步,对工业过程控制设备的控制 效果和日常维护提出了更高的要求。 气动调节阀以其独特的特点在过 程控制领域中得到了广泛的应用,而阀门定位器作为气动调节阀的主 控部件,能够在很大程度上提高阀门的控制精度、 响应速度,并显著的 改善阀门的动态特性。PROFIBUS-DP 总线以其独有的优势在过程控制 领域中广泛使用,并于 2001 年成为我国的机械行业标准,目前国内研 究的多是基于 HART 协议的智能阀门定位器,而我国过程控制领域大 多采用 PROFIBUS-DP 总线协议,基于此,研究基于 PROFIBUS-DP 的智能 阀门定位器具有较大的意义。 本文所研究的智能阀门定位器采用二线 制电源供电,通过嵌入式设计技术,对定位器的整体进行了分析研究, 侧重于硬件系统的构建,所做的工作主要如下 1、通过查阅相关文献 资料,对国内外的智能阀门定位器进行分析研究。从定位器的结构、 工作原理和所能实现的功能着手,分析了不同类型、结构阀门定位器 的优缺点;同时对 PROFIBUS-DP 现场总线的协议结构、通讯模型和功 能特性等进行了分析研究,并给出了 PROFIBUS-DP 智能节点的设计方 法;2、对气动调节阀控制系统的内在机理进行分析研究,给出了调节 阀流量特性数学模型、 压电阀 PWM 控制信号与阀位关系数学模型以及 阀位反馈信号换算数学模型。3、采用模块化分析研究方法,对智能阀 门定位器系统各个组成部分进行深入分析研究,比较了各种设计方法

的不同,并在此基础上构建了基于微处理器 S3C44B0 的智能阀门定位 器系统整体方案,并给出了预期的设计目标。4、对智能阀门定位器硬 件系统进行分析研究,采用嵌入式设计技术,以二线制供电设计为基 本点,对定位器的主要核心部分电路,如电源电路、取样电路、I/P 转 换单元、反馈电路和通信电路分别进行分析设计研究,并给出了相应 的设计方案。5、针对智能阀门定位器软件部分进行了整体规划设计, 先给出了软件系统整体设计方案,再根据模块化程序设计方法,着重 对信号采样处理程序、主控程序、通讯程序和人机界面程序进行了软 件分析设计。 【英文摘要】With the continuous advancing of society, highly requirements were proposed about control effect and routine maintenance in industrial process control equipments. Pneumatic valve was extensively used in process control region for its special characteristics. Valve locator, the master control unit of pneumatic valve, could improve the control accuracy and response speed of the valve to a large degree, and meliorate dynamic characteristics of the valve significantly.PROFIBUS-DP bus was widely used in process control region for its unique advantage and was evolved as the machinery industry standard in our country in 2001. The smart valve positioner being researched internal are mostly based on HART protocol, while the PROFIBUS-DP bus was adopted more in

process control region in our country. According to this, there is greater significance in researching smart valve positioner based on PROFIBUS-DP bus.The smart valve positioner being studied in this paper adopted two-wire power supply. The overall locator was analyzed and researched in this paper by embedded design techniques, which focus on the structure of hardware system. The mainly work are as follows:1. The smart valve positioner in and abroad was analyzed and researched in this paper, referring to relevant documents and literatures. Advantages and disadvantages of valve positioners with different type and structure were analyzed in the basis of structure, working principle and function. At the same time, the protocol architecture, communication model and functional characteristic of PROFIBUS-DP field-bus were analyzed and studied. Also the design method of PROFIBUS-DP intelligent node was proposed.2. The inner mechanism of pneumatic valve control system was studied. The flow characteristics mathematical model of valve, piezoelectric valve PWM control signal and valve position mathematical model and valve position feedback signal conversion mathematical model were all proposed in this paper. 3. Various components of the smart valve positioner system were analyzed and studied deeply with the modular

analyzing and study method. The overall program of smart valve positioner system was structured based on MPU S3C44B0, in the basis of comparing the differences of various design methods. And the desired design goals were proposed.4. The hardware system of smart valve positioner was analyzed and researched in this paper. The main core circuits of the positioner such as power circuits, sampling circuits, I/P converting unit, feedback circuits and communication circuits were analyzed and studied in the basis of two-wire power supply design by embedded design techniques. Also the design projects were proposed.5. Overall planning was designed for software components of the smart valve positioner. The overall design of software system was proposed at first. And then the signal sampling process, master control program, communicate program and man-machine interface program were analyzed and designed in the basis of software with the modular programming method. 【关键词】智能阀门定位器 二线制供电 Profibus-DP S3C44B0 数学模型 【英文关键词】Smart valve positioner supply model 【目录】基于 PROFIBUS-DP 智能阀门定位器研究 摘要 Profibus-DP S3C44B0 Two-wire power Mathematical

3-4 9

Abstract 4-5

第 1 章 绪论 9-17

1.1 引言

1.2 阀门定位器概述 9-14

1.2.1 阀门定位器的结构

与工作原理 9-10 10-12

1.2.2 阀门定位器的发展 1.2.4 智

1.2.3 传统阀门定位器的缺点 12-13 1.3 课题的提出

能阀门定位器的结构与特点 13-14 14-16

1.3.1 课题的研究背景 14-15

1.3.2 课题的来

源与主要任务 15 15-16 16-17

1.3.3 课题的研究工作及意义 1.5 本文的内容安排 2.1

1.4 本文的主要工作 16

第 2 章 PROFIBUS-DP 现场总线 17-27

PROFIBUS 现场总线概述 17-23 18-19

2.1.1 PROFIBUS 协议结构 2.2

2.1.2 PROFIBUS 通讯模型 19-23 23-24

PROFIBUS-DP 功能特性 24-26

2.3 PROFIBUS-DP 智能节点设计 第 3 章 PROFIBUS-DP 智能

2.4 本章小结 26-27 27-37

阀门定位器模型研究 27-28

3.1 调节阀工作方式 3.2.1

3.2 气动调节阀流量特性数学模型 28-33

气动调节阀流量输出模型 28-30 与阀门开度数学模型 模型 31-33 33-34 30-31

3.2.2 气动调节阀输入信号 3.2.3 气动调节阀流量特性数学

3.3 压电阀 PWM 控制信号与阀位数学模型 3.4 阀位反馈信号处理数学模型 34-36 3.5 本

章小结 36-37 37-51

第 4 章 PROFIBUS-DP 智能阀门定位器整体设计 4.2 智能阀门定位器 4.2.2

4.1 系统结构设计 37-38

硬件方案研究 38-48

4.2.1 控制单元设计 38-40

前向通道及后向通道设计 40-47 47 48-50 50-51 51-72 52-56 59-61 63-67 67-68 68-71 4.2.4 通讯单元 47-48

4.2.3 人机界面 4.3 控制策略研究 4.5 本章小结

4.4 系统设计的性能指标目标 50

第 5 章 PROFIBUS-DP 智能阀门定位器硬件设计 5.1 电源单元 51-59 5.1.2 方案的选择 56-59 5.3 I/P 驱动单元 61-63 5.5 人机界面 67-68 5.5.2 按键电路 68 5.7 本章小结 71-72 72-83 73-76 5.1.1 DC-DC 转换器 5.2 电流取样单元 5.4 阀位反馈单元 5.5.1 显示单元 5.6 通讯单元 第 6 章 PROFIBUS-DP 智能 6.2 6.2.2

阀门定位器软件设计 信号采样处理程序 浮点数处理 75 76 76-77 78-80 82-83 83 85-88

6.1 总体设计 72-73 6.2.1 数字滤波 73-75 75-76

6.2.3 标度变换

6.2.4 越限判断

6.3 主控程序设计 76-78

6.3.1 控制策略分析 6.4 通讯程序设计 6.6 本章小结 7.1 工作总结 参考文献

6.3.2 控制程序设计 77-78 6.5 人机界面程序设计 80-82

第 7 章 总结与展望 83-84 7.2 展望 83-84 致谢 84-85 88

攻读学位期间的研究成果




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