A Research on The Stiction and Detection in The Control Valves

摘要：

Stiction is a common problem in spring-diaphragm type valves, which are widely used in the process industry. A non-invasive method for detecting and quantifying stiction in control valve has been presented in this paper. Although there have been many attempts to understand and detect stiction in control valves, none of the current methods can simultaneously detect and quantify stiction. The method first detects nonlinearity in a control loop by the use of the sensitivity of the normalized bispectrum or bicoherence to the nonlinear interactions that may be present in the control error signal.If nonlinearity is detected, then controlled variable(pv) and controller output(op) signals are filtered using frequency domain wiener filter to obtain filtered pv and op signals.This work describes a model free method that can detect and quantify stiction that may be present in control valves using routine operating data obtained from the process. No additional excitation or experimentation of the plant is required.

关键词： Stiction Control valve Detection of loop pv-op plot

作者: Sen Li Chunliang ZHANG Jian Li Jia Liu

作者单位: School of Mechanical and Electrical Engineering, Guangzhou University, Guangzhou,Guangdong 510006, C School of Mechanical Sci.&Engin.,Huazhong Univ.of Sci.and Technology,Wuhan 430074,China University of South China, School of Mechanical Engineering, Hengyang, China, 421001

会议类型: 国际会议

会议名称: 2011 International Conference on Mechatronics and Materials Processing(2011年机电一体化与材料加工国际会议 ICMMP)

会议地点: 广州

会议语种:英文

页码: 2156-2162

在线出版日期: 2011-11-18（万方平台首次上网日期，不代表论文的发表时间）