【作者】 邓立为；

【导师】 高俊山；

【作者基本信息】 哈尔滨理工大学 ， 控制理论与控制工程， 2010， 硕士

【摘要】 伴随着科学技术的发展,数据采集技术也得到了飞速的发展,利用采集得到的数据进行控制的方式也越来越多,在工程项目中也得到了越来越多的应用。传统的数据采集技术主要集中在利用单片机以及工控机PLC进行的数据采集,这样的数据采集技术由于采集精度不够,采集速度不够高的缺点,随着电子工业的发展已经不能满足人们的需要。把嵌入式技术引用到数据采集技术中能够解决上述存在的问题。嵌入式系统是当今最流行的前沿技术之一,将嵌入式技术引入数据采集与控制系统之中,可大大提高系统的实时性和灵活性,能够满足日益提高的测量需求。进而在电子工业方面,基于嵌入式硬件平台和嵌入式软件平台的数据采集技术,已经成为当代社会数据采集的主流。考虑到嵌入式数据采集技术的优势以及良好的发展前景,本课题便是基于嵌入式数据采集技术做出的研究。本课题在研究嵌入式实时操作系统、ARM处理器和数据采集技术的基本原理的基础上,完成了基于ARM处理器和嵌入式实时操作系统的压力数据采集与控制系统的设计。该系统与工程中的传感器配合使用可以实现对温度、液位、压力、流量等各种常用数据的采集。本文主要研究内容如下:汽轮机运行过程中,由于摩擦和高温蒸汽热传导作用,会使汽轮机局部过热和润滑油失效,造成输出转矩不能达到要求和爆瓦,甚至发生爆炸,为了保障汽轮机能安全稳定运行,对汽轮机系统中冷却水循环提出了较高的要求。为确保冷凝水回路的正常运转,对冷凝水回路的电动球阀准确控制、采集水回路中的压力数值极其重要。本文以ARM为控制核心,对冷凝水回路的压力数据进行采集,并采用数字滤波器进行了处理,使数据更加精确可靠。利用采集处理之后的数据对控制水阀采用PID控制,达到冷凝水回路压力准确控制的目的,进而能够保证汽轮机的安全稳定运行。更多还原

【Abstract】 With the rapid development of science and technology, data acquisition technology has developed rapidly, there is more and more control manners using the data collected and it has also been used more and more in the project. Traditional data acquisition technology focused on the use of SCM as well as PLC, because the precision and speed of collection are not high enough, it can not meet people’s needs for the development of the electronics industry. The introduction of embedded technology can solve the above problem. Embedded system is one of the most popular preface technologies today. The use of embedded technology into data acquisition and control system can greatly improve real-time and flexibility of the system to meet the increasing demand for measurement. Thereby data acquisition technology based on embedded hardware platform and software platform has become the mainstream of contemporary society data acquisition technology in the electronics industry. Taking into account the advantages of embedded data acquisition technology and its good development prospects, the research of this subject is based on the embedded data acquisition.This subject on the basis of the research of the basic principle of embedded real-time operating system, ARM processor and data acquisition technology have completed the design of pressure data acquisition and control system based on ARM processor and embedded real-time operating system. The system used in conjunction with sensors in engineering can achieve the acquisition of a variety of commonly used data such as temperature, liquid level, pressure and flow. The main research content of this paper is that the turbine is running, because of the friction and high temperature steam heat conduction in the operation, steam turbine will be local overheating, and lubricants will be failure which make the output torque do not meet the requirements and explosion-watt, or even an explosion. In order to protect the safe and stable operation of turbine, there is a higher demand for the turbine cooling water circulation system. Ensure the normal operation of condensate loop, the accurate control of condensate loop electric ball valve and the pressure data acquisition of the water loop are extremely important. In this paper, ARM is the control core to collect pressure data of the condensed water cycle and use digital filters to deal with the data which make the data more accurate and reliable.By using the data obtained and PID control to control valve, the aim to control the pressure of condensate loop exactly is achieved, thus the safe and stable operation of steam turbine is ensured.更多还原