一种过程系统信号的频域分析方法  

A Frequency Domain Analysis Method for Process System Signals

作　　者：任娟娟[1] 王越超 Ren Juanjuan;Wang Yuechao(Electric Power Research Institute of Guangdong Power Grid Co., Guangzhou Guangdong 510080;China Resources Power Technology Research Institute Co., Ltd, Shenzheng Guangdong 518001)

机构地区：[1]广东电网公司电力科学研究院,广东广州510080 [2]华润电力技术研究院有限公司,广东深圳518001

出　　处：《数字技术与应用》2017年第11期43-44,共2页Digital Technology & Application

摘　　要：本文提出了一种过程信号频域预处理方法,通过采样、零阶保持、零阶保持补偿、矩形脉冲分解和阶跃信号结尾等5个步骤,将一个非周期且终值稳定值不为零的原信号转化为有限数量的矩形脉冲信号和1个结尾阶跃信号。解决了非周期过程信号频域处理的预处理问题。然后提出了一种非周期信号的拉氏变换方法,通过原始信号频域拉氏变换、复频域表达和频域恢复的方法,实现了将非周期信号转换为拉氏变换后的线性叠加。理论推导、仿真实验和实际应用结果表明了该方法能够为过程系统频域分析提供了一种较为准确和有效的手段。This paper proposes a frequency domain signal preprocessing method.By introducing5steps as sampling,zero order hold,zero compensation,rectangular pulse decomposition and step signal at the end,a non periodic with final stable value is transformed into some finite number of rectangular pulse signals and an ended step signal.The problem of preprocessing the aperiodic process signal in frequency domain is solved.And the Laplace transform method is proposed for non periodic signal.By Laplace transforming,complex-frequency domain expression and frequency domain expression recovery of original signal,the non periodic signal is transformed into a linear superposition of the Laplace transform.Theoretical deduction,simulation experiments and practical application results show that this method is accurate and effective for frequency domain analysis of process systems.

关 键 词：频域特性分析 傅里叶变换 拉普拉斯变换 矩形脉冲分解 非周期过程信号 

分 类 号：TN791[电子电信—电路与系统]