A semi-physical model for pneumatic control valves

Fang, Lian-Hua; Tang, Lin; Wang, Jiandong; Qun-li, Shang

doi:10.1007/s11071-016-2790-5

Cited by 10 publications

(5 citation statements)

References 18 publications

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“…According to the principle of partial pressure, the constant air resistance partial pressure ∆P 1 (formula ( 13)) in the gas path increases, and the variable air resistance partial pressure ∆P 2 (formula ( 14)) decreases, and finally ∆P 2 approaches zero, that is, P b approaches zero. The mechanism analysis result of the nozzle baffle mechanism is consistent with the numerical analysis result of formula (16). Based on the above analysis, the derivation of formula ( 16) is correct.…”

Section: Nozzle-flapper Structure Modelsupporting

confidence: 76%

“…Developed on the physical model and datadriven model, the semi-physical model is proposed. The semi-physical model refers to the establishment of the physical model for part of the system, and the remaining part is described by a mathematical model [16,17]. In article [18], He established a semi-physical model of pneumatic control valve system firstly based on conventional operating data and limited process knowledge, and the non-linear characteristic parameters of the control valve system could be estimated according to the semi-physical model.…”

Section: Of 15mentioning

confidence: 99%

“…Both F g generated by the fluid movement in the valve body and F i required to obtain the valve stem plug into the seat are assumed to be zero because of their negligible contribution in the model according to the article [32]. F f is the friction between the valve stem and packing, the classical friction model is given in article [16]. v =…”

Section: Pneumatic Diaphragm Actuator Modelmentioning

confidence: 99%

“…Substituting (31) into (16), the function relationship between the input air pressure of the pneumatic diaphragm actuator P b and input current i can be obtained:…”

Section: Model Integrationmentioning

confidence: 99%

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A New Control Method for Backlash Error Elimination of Pneumatic Control Valve

Zhang

2021

Processes

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Backlash is a commonly non-linear phenomenon, which can directly degrade the control accuracy of a pneumatic control valve. To explain the cause and law of backlash error, and to propose an effective method, many research works on the modeling of a pneumatic control valve system have been carried out. The currently model of a control valve system can be classified as a physical model, data-driven model, and semi-physical model. However, most models only consider the force-displacement conversion process of a pneumatic diagram actuator in a pneumatic control valve system. A physical model based on the whole workflow of the pneumatic control valve system is established and a control method to eliminate the backlash error is proposed in this paper. Firstly, the physical model of the pneumatic control valve system is established, which is composed of three parts: pneumatic diaphragm actuator model, nozzle-flapper structure model and electromagnetic model. After that, the input–output relationship of the pneumatic control valve system can be calculated according to the established physical model, and the calculation results are consistent with the experimental result. Lastly, a self-calibration PID (SC-PID) control method is proposed for backlash error elimination. The proposed method can solve valve stem oscillation caused by backlash during valve control.

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Section: Nozzle-flapper Structure Modelsupporting

confidence: 76%

Section: Of 15mentioning

confidence: 99%

Section: Pneumatic Diaphragm Actuator Modelmentioning

confidence: 99%

“…Substituting (31) into (16), the function relationship between the input air pressure of the pneumatic diaphragm actuator P b and input current i can be obtained:…”

Section: Model Integrationmentioning

confidence: 99%

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A New Control Method for Backlash Error Elimination of Pneumatic Control Valve

Zhang

2021

Processes

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“…Experiments show that this method is difficult to apply in practice due to the large amount of calculation [2]. Fang proposed a novel pneumatic control valve physical model, which does not ignore the backlash characteristics during the control process, but this article does not propose the solution to the valve backlash problem [3]. By designing and adjusting fuzzy rules, Zhang realized the self-tuning of controller parameters, which effectively improved the response speed of the regulating valve, overcome the delay effect, and improved the performance of the control system [4].…”

Section: Introductionmentioning

confidence: 99%

A software and hardware design scheme of intelligent valve positioner

Zhang

2021

E3S Web Conf.

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Valve positioner is the core component of the pneumatic control valve. A new software and hardware design scheme of intelligent valve positioner is presented in this paper. The circuit composition of each part of the intelligent valve positioner is introduced in hardware part. Based on it, a hardware solution to realize HART ‘multi-point’ communication is proposed in this research. In the software design, a novel combined PID control algorithm is proposed to solve the nonlinear problem caused by the friction between the valve stem and the packing during the control process. Simulation results show that the method proposed in this paper is better than traditional PID method and fuzzy PID method. The software and hardware design scheme of the valve positioner proposed in this paper has certain guiding significance for the development of related products.

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