基于小波包趋势提取的化工过程稳态检验

doi:10.3969/j.issn.0438-1157.2013.12.022

化工学报 ›› 2013, Vol. 64 ›› Issue (12): 4416-4421.DOI: 10.3969/j.issn.0438-1157.2013.12.022

基于小波包趋势提取的化工过程稳态检验

姚书会, 楚纪正

北京化工大学信息科学与技术学院, 北京 100029

收稿日期:2013-07-30 修回日期:2013-08-10 出版日期:2013-12-05 发布日期:2013-12-05
通讯作者: 楚纪正
作者简介:姚书会（1989- ），男，硕士研究生。
基金资助:
国家高技术研究发展计划项目（2007AA04Z191）。

Steady-state detection of chemical processes based on trend extraction with wavelet packet

YAO Shuhui, CHU Jizheng

College of Information Science & Technology, Beijing University of Chemical Technology, Beijing 100029, China

Received:2013-07-30 Revised:2013-08-10 Online:2013-12-05 Published:2013-12-05
Supported by:
supported by the High-tech Research and Development Program of China (2007AA04Z191).

摘要/Abstract

摘要： 构建了一种基于小波包阈值降噪的化工过程稳态检验方法。方法包括3个步骤：粗差剔除，小波包变换降噪和稳态辨识，具有简单易行且精度良好的特点。在小波包降噪中，通过引入阈值补偿因子，使得降噪过程更加灵活，以便在去除随机噪声和信号真值保留之间取得均衡效果。两个仿真示例展示了本文方法在单变量和多变量系统稳态检验上的有效性。

关键词: 稳态检验, 小波包, 降噪, 阈值, 趋势提取

Abstract: Steady-state detection is to determine whether the chemical process is operating in a state of steadiness or not.It is an essential step in the field of process optimization and so on.Based on wavelet packet analysis for denoising,a steady state detection scheme is constructed in this study.The scheme includes three steps,removing coarse error,denoising and identifying steady state periods,and is featured with simple implementation and good accuracy.In the denoising step with wavelet packet transform,a compensating factor is introduced for the threshold,making it flexible and easy to achieve the right balance between removal of the noise and preservation of the true value of a signal.Two simulation tests are presented to demonstrate the effectiveness of the scheme of this study.

Key words: steady-state detection, wavelet packet, denoising, threshold, trend extraction

中图分类号:

TP27
TQ015.9

姚书会, 楚纪正. 基于小波包趋势提取的化工过程稳态检验[J]. 化工学报, 2013, 64(12): 4416-4421.

YAO Shuhui, CHU Jizheng. Steady-state detection of chemical processes based on trend extraction with wavelet packet[J]. CIESC Journal, 2013, 64(12): 4416-4421.

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基于小波包趋势提取的化工过程稳态检验

Steady-state detection of chemical processes based on trend extraction with wavelet packet

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