Analysis of Electro-Pneumatic Positioner Valve System Considering Non-Linear Characteristics of Pilot Valve

A simple method for detecting stick-slip fault of industrial digital positioners (control valves) in control systems is presented. Only the valve travel setting signal and the actual valve travel signal are required. These two signals are available in most industrial processes, such as DCS. Therefore, the proposed method can be applicable to a large number of digital positioners with digital positioner. Meanwhile, the knowledge of the plant and the digital positioners are not necessary. Real world data sets sampled from a power plant were used to test its efficiency.

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“…Its seriousness is determined by the friction characteristics. Detailed analysis of this phenomenon can be seen in the past studies [13,14].…”

Section: Description Of Stick-slip Faultmentioning

confidence: 99%

A simple method for fault detection of industrial digitial positioners

Huang

Feng²

2008

2008 7th World Congress on Intelligent Control and Automation

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“…Its seriousness is determined by the friction characteristics. Detailed analysis of this phenomenon can be seen in the past studies (Li C.B., 1982;Kagawa et al 1993). Fig.…”

Section: Ty"ical Malfuncti"ns "F Digital ""Siti"nersmentioning

confidence: 99%

Fault Detection of Actuator with Digital Positioner Based on Trend Analysis Method

Huang¹,

Liu²,

Yuguang³

2010

Fault Detection

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“…The structure of the pilot valve is complex. Literature [1] has presented the dynamic characteristics of the pneumatic diaphragm motor with a conventional positioner. Experimental fi ndings demonstrated that when the speed of the process fl uid becomes large the actuator tend to oscillatem, and it is necessary to make efforts to improve the stiffness of the diaphragm motor in order to satisfy the needs of the development of the process plant131.…”

mentioning

confidence: 99%

Experimental Study on Solenoid Valves Controlled Pneumatic Diaphragm Motor

Yang

Kawai

Kawakami

et al. 1996

Proceedings of the JFPS International Symposium on Fluid Power

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A pneumatic diaphragm motor controlled by two PWM solenoid valves are studied . First, the characteristics of the PWM solenoid valve is investigated and a simplified mathematical model of the valve is presented . Second, a PWM control law is synthesized by considering the effects of the valve characteristics and the asymmetrical flow characteristics between the charging process and the discharging process of the system. The main parameters that influences the performance of the system are analyzed and their values are optimized experimentally . At last, the frequency response and the stiffness characteristics of the proposed system are obtained and the results show that the performance of the proposed system is better than the traditional one. These experiments verify the theoretical design work, and indicate that the PWM controlled pneumatic diaphragm motor is feasible for practical use .

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Analysis of Electro-Pneumatic Positioner Valve System Considering Non-Linear Characteristics of Pilot Valve

Abstract: Control valves play very important role as final control elements in process control system and most of them are driven by the pneumatic pilot valve.

Cited by 5 publications

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A simple method for fault detection of industrial digitial positioners

A simple method for fault detection of industrial digitial positioners

Fault Detection of Actuator with Digital Positioner Based on Trend Analysis Method

Experimental Study on Solenoid Valves Controlled Pneumatic Diaphragm Motor

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