关键词: 粘滞特性, 控制阀, 频域分析, 傅里叶级数

Abstract: Stiction is the most common problem in control valves，which causes oscillations in control loops.This paper proposes a spectral method based on Discrete Fourier Transformation to detect valve stiction for diagnosis of oscillations.The spectral method can be used for both self-regulating processes and integrating processes.The effectiveness of the proposed method is demonstrated with the studies of simulation.

Key words: stiction, control valve, spectrum analysis, Fourier series