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三容系统智能数字滤波器设计 电气工程学院电子信息科学与技术专业：何强 指导老师：张虹 摘要：多容器流程系统是过程控制中的一种典型的被控对象，生产实践中有着广阔的应用背景。在检测的过程中，由于工况复杂，很容易产生测量噪声，从而使基于系统状态常规控制策略的控制系统无法投入运行，或运行效果不好，严重地影响生产安全和经济效益。 本文以三容实验系统为例设计数字滤波器，首先建立三容系统的数学模型，再基于SIMULINK建立三容仿真实验系统，然后设计了防脉冲干扰平均值滤波器、中值滤波器、滑动算术平均值滤波器、滑动加权算术平均值滤波器、一阶低通滤波器5种数字滤波器进行滤波，比较各种滤波器滤波效果的优劣，以及各自的特性。 在应用的过程中，数字滤波器滤波的平滑性始终与其真实性是矛盾的。为了解决这个矛盾，本文设计了非线性一阶数字滤波器，当数据快速变化时使数据快速跟上，当数据变化缓慢时平滑性优先。然后运用这种滤波器进行滤波，达到了良好的滤波效果。 关键词： 数字滤波；噪声干扰；三容系统 Abstract：Multi-vessel process system is a typical process control in a controlled object and production practice has broad application background. As the complexity of working conditions,it is very susceptible to generate measurement noise in the process of testing.As a result, conventional control strategy of control system based on system status can not be put into operation or bad in the operational effect.Therefore,it is seriously affected the production of safe and cost-effective. I take the three-tank system for example to design digital filter in this thesis.Firstly,establish a mathematical model of three-tank system .Secondly, establish SIMULINK-based three-tank simulation system. Thirdly to design five filters to filter waves, anti-pulse and anti-interference average filter, median filter，slide-arithmetic-mean filter, sliding weighted arithmetic mean filter, first-order low-pass filter.At last, compare the filtering effect of the various filters and their characteristics. In the application process,the smoothness of digital filters filtering and its authenticity has always been contradictory. To resolve this conflict,I design a kind of nonlinear first-order digital filter in the thesis.That is to say, rapidly change when the data quickly to keep up with the data, change is slow when the data smoothness priority.Above all, this kind of filter can achieve a good filtering effect. Keywords：Digital filtering ; Interference of noise ; Three-tank system 1 引言 自本世纪30年代以来，自动化技术获得了惊人的成就，已在工业自动化生产和科学发展中起着关键的作用。目前，自动化装置已成为大型设备不可分割的重要组成部