Describing function of the pneumatic flapper-nozzle valve

Pršić, Dragan; Fragassa, Cristiano; Nedić, Novak; Pavlović, Ana

doi:10.1016/j.ymssp.2019.01.043

Cited by 5 publications

(5 citation statements)

References 16 publications

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“…As illustrated in Figure 1 , the flapper–nozzle mechanism is one of the most prevalent displacement-flow or displacement-pressure converters in pneumatic measurement and control [ 9 ]. Its role is to convert the minute displacement of the flapper into pressure changes within the pressure control chamber.…”

Section: System Design and Modelingmentioning

confidence: 99%

“…To enhance the performance of flapper–nozzle mechanisms, new solutions, and technical means need to be proposed. Numerous scholars have undertaken mathematical and nonlinear dynamic modeling and research, ranging from linearized algebraic equations to nonlinear dynamic model control systems [ 5 , 6 , 7 , 8 , 9 ]. Key structural parameters of nozzles significantly influence the flow characteristics of the internal energy transfer medium and are a focal point of fundamental theoretical research and design development.…”

Section: Introductionmentioning

confidence: 99%

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Simulation and Experimental Study of a Novel Negative-Pressure Flapper–Nozzle Mechanism

Ma,

Xiao,

Yan

et al. 2023

Micromachines

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As the manufacturing industry evolves, the significance of control valve positioners in chemical production escalates. The flapper–nozzle system, the heart of control valve positioners, directly influences the linearity of system control. Presently, studies on the flapper–nozzle system primarily focus on dynamic system modeling and computational fluid dynamics simulations. However, traditional flapper–nozzle mechanisms often fail to achieve linear control objectives. This paper proposes a novel negative-pressure nozzle structure to tackle this issue, combining computational fluid dynamics and experimental methods, and considering gas compressibility during high-speed flow. Both simulation and experimental results suggest that the new structure improves the supply air pressure and broadens the linear pressure output range of the system, showing significant potential for practical applications.

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Section: System Design and Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulation and Experimental Study of a Novel Negative-Pressure Flapper–Nozzle Mechanism

Ma,

Xiao,

Yan

et al. 2023

Micromachines

View full text Add to dashboard Cite

show abstract

“…(4) Flow in this valve is assumed to be turbulent because it has been certified that turbulent flow occurs at high Reynolds numbers in the poppet valve and spool valve [16]. (5) The effect of temperature on fluid properties is neglected and liquid properties are constant [15]. (6) The oil in this valve is incompressible and the leakage of this valve is omitted [14].…”

Section: System Modellingmentioning

confidence: 99%

“…Single stage proportional valves can only be used in the small flow conditions owing to the performance limitation of electromagnet, while two-stage proportional valves can be used in the large flow conditions [1,2]. In the two-stage proportional valves, the feedback types for proportional control include electric position feedback, force position feedback and hydraulic position feedback [3][4][5]. The twostage proportional valve with hydraulic position feedback was originally developed by Andersson.…”

Section: Introductionmentioning

confidence: 99%

Flow Control for a Two-Stage Proportional Valve with Hydraulic Position Feedback

Wang

Huang

et al. 2020

Chin. J. Mech. Eng.

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The current research mainly focuses on the flow control for the two-stage proportional valve with hydraulic position feedback which is named as Valvistor valve. Essentially, the Valvistor valve is a proportional throttle valve and the flow fluctuates with the change of load pressure. The flow fluctuation severely restricts the application of the Valvistor valve. In this paper, a novel flow control method the Valvistor valve is provided to suppress the flow fluctuation and develop a high performance proportional flow valve. The mathematical model of this valve is established and linearized. Fuzzy proportional-integral-derivative (PID) controller is adopted in the closed-loop flow control system. The feedback is obtained by the flow inference with back-propagation neural network (BPNN) based on the spool displacement in the pilot stage and the pressure differential across the main orifice. The results show that inference with BPNN can obtain the flow data fast and accurately. With the flow control method, the flow can keep at the set point when the pressure differential across the main orifice changes. The flow control method is effective and the Valvistor valve changes from proportional throttle valve to proportional flow valve. For the developed proportional flow valve, the settling time of the flow is very short when the load pressure changes abruptly. The performances of hysteresis, linearity and bandwidth are in a high range. The linear mathematical model can be verified and the assumptions in the system modeling is reasonable.

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“…It is based on the assumptions of one single nonlinear component and the nonlinear component is not dynamical and time invariant [19]. The Fourier transform is used to analyze the DF of the system [20] as in ( 4)…”

Section: Fig5the Behavior Of Nonlinear Relaymentioning

confidence: 99%

Design and Implement of Dual Axis Solar Tracker System Based Arduino

Gaeid

Uddin

Mohamed

et al. 2020

Tikrit j. eng. sci.

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The computer control plays important role in the solar cell design and development of dual axis solar tracker for the sun's position. The main goal of this paper is to maximize energy output to reduce panel temperature (cooling), to increase efficiency of the PV panel. Small-scale solar is developed through a complete hardware and software in order to function accurately. The main parts in this work are Arduino Uno R3, kit relay, LDR (Light Dependent Resistor), LM35 (temperature sensor), high-efficiency solar panel and satellite motor. The Protuse software is used with (Arduino Uno) as embedded computer control. The results show the effectiveness of the complete tracking system.

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Describing function of the pneumatic flapper-nozzle valve

Cited by 5 publications

References 16 publications

Simulation and Experimental Study of a Novel Negative-Pressure Flapper–Nozzle Mechanism

Simulation and Experimental Study of a Novel Negative-Pressure Flapper–Nozzle Mechanism

Flow Control for a Two-Stage Proportional Valve with Hydraulic Position Feedback

Design and Implement of Dual Axis Solar Tracker System Based Arduino

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