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《Journal of Zhejiang University(Engineering Science)》 2007-10
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Model-based actuator fault diagnosis

SHANG Qun-li,SUN Li,WU Hai-yan(School of Automation,Hangzhou Dianzi University,Hangzhou 310018,China)  
Online actuator fault diagnosis and separation were realized based on dynamic characteristics analysis and complete nonlinear dynamic models for actuators were constructed based on mechanical analysis.The online fault diagnosis was realized by using the fault residuals obtained from the measured actuator signals and the model calculation values,then the fault separation was performed through analyzing the varieties of the residuals and its combination.The experimental results show that through analyzing the residuals of valve stem displacement and pressure value main faults can be accurately and timely diagnosed and separated,such as valve blockage,friction enlarge,diaphragm leakage,supply pressure drop and spring aging.
【Fund】: 国家自然科学基金资助项目(60774031)
【CateGory Index】: TP277
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