Pressure Control of the Proportional Directional Control Valve Test Rig Based on the Fuzzy Proportional-Integral-Double-Integral Controller

2017 ◽  
Author(s):  
Wenzhuo Shi ◽  
Jianhua Wei ◽  
Jinhui Fang ◽  
Mingjie Li ◽  
Qiang Zhang ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Performance Test ◽  
Control Valve ◽  
Pressure Control ◽  
Flow Control Valve ◽  
Test Rig ◽  
Double Integral ◽  
Relief Valve ◽  
Proportional Integral ◽  
Directional Control

The pressure drop needs to be kept constant in the flow rate/input signal performance test of proportional directional control (PDC) valve. In general, the control of valve pressure drop is implemented by regulating the relief valve or flow control valve that located between port A and port B of the PDC valve. But in this study, the load of the test valve is fixed and the stable pressure drop is obtained by changing the proportional relief valve which is placed in the inlet of the PDC valve. Then the mathematical model of the test rig and several controllers are established based on this idea. To be specific, proportional-integral (P-I) controller, proportional-integral-double-integral (P-I-II) controller, and fuzzy proportional-integral-double-integral (FP-I-II) controller are all applied to stabilize the pressure drop in this study. And the FP-I-II controller with compensation (FP-I-II-WC) is proved to be the best for this work both in the simulation and the actual experiment.

Boom Motion Control Using Pressure Control Valve

2014 ◽  
Author(s):  
Jesper K. Sørensen ◽  
Michael R. Hansen ◽  
Morten K. Ebbensen
Keyword(s):  
Motion Control ◽  
Control Valve ◽  
Pressure Control ◽  
Flow Control Valve ◽  
Directional Control ◽  
Experimental Implementation ◽  
In Series ◽  
Pressure Control Valve ◽  
Valve Control ◽  
Loop Motion

This paper focuses on the reduction in oscillations created by counterbalance valves by using a proportional pressure control valve. The motion control of a cylinder boom is presented using this valve, which is a 4/3-way directional control valve with the main spool in series with an upstream compensator. The input to the valve control is a main spool position reference and, indirectly, the compensator downstream pressure. This gives a different flow gain and, therefore, a different feedforward scheme as compared to applications with the more common pressure compensated flow control valve. The theory behind the pressure control valve is presented and applied to both a theoretical and experimental implementation of closed loop motion control of the jib boom of a commercial vehicle loader crane.

L1 Adaptive Control for Aircraft Air Management System Pressure-Regulating Bleed Valve

2017 ◽  
Vol 139 (12) ◽  
Author(s):  
John Cooper ◽  
Chengyu Cao ◽  
Jiong Tang
Keyword(s):  
Management System ◽  
Control Valve ◽  
Pressure Control ◽  
Adaptive Controller ◽  
System Model ◽  
Flow Control Valve ◽  
L1 Adaptive Control ◽  
System Pressure ◽  
L1 Adaptive Controller ◽  
Linear Controllers

This paper presents an L1 adaptive controller for pressure control using an engine bleed valve in an aircraft air management system (AMS). The air management system is composed of two pressure-regulating bleed valves, a temperature control valve, a flow control valve, and a heat exchanger/precooler. Valve hysteresis due to backlash and dry friction is included in the system model. The nonlinearities involved in the system cause oscillations under linear controllers, which decrease component life. This paper is the unique in the consideration of these uncertainties for control design. This paper presents simulation results using the adaptive controller and compares them to those using a proportional–integral (PI) controller.

Design and Analysis of a Flow-Control Valve With Controllable Pressure Compensation Capability for Mobile Machinery

2021 ◽  
Author(s):  
Bo Wang ◽  
Yunwei Li ◽  
Long Quan ◽  
Lianpeng Xia
Keyword(s):  
Pressure Drop ◽  
Flow Control ◽  
Pressure Difference ◽  
Control Valve ◽  
Flow Control Valve ◽  
Continuous Control ◽  
Small Flow ◽  
Pressure Compensation ◽  
Force Compensation ◽  
Control Accuracy

Abstract There are the problems in the traditional pressure-compensation flow-control valve, such as low flow control accuracy, small flow control difficulty, and limited flow range. For this, a method of continuous control pressure drop Δprated (i.e. the pressure drop across the main throttling orifice) to control flow-control valve flow is proposed. The precise control of small flow is realized by reducing the pressure drop Δprated and the flow range is amplified by increasing pressure drop Δprated. At the same time, it can also compensate the flow force to improve the flow control accuracy by regulating the pressure drop Δprated. In the research, the flow-control valve with controllable pressure compensation capability (FVCP) was designed firstly and theoretically analyzed. Then the sub-model model of PPRV and the joint simulation model of the FVCP were established and verified through experiments. Finally, the continuous control characteristics of pressure drop Δprated, the flow characteristics, and flow force compensation were studied. The research results demonstrate that, compared with the traditional flow-control valve, the designed FVCP can adjust the compensation pressure difference in the range of 0∼3.4 MPa in real-time. And the flow rate can be altered within the range of 44%∼136% of the rated flow. By adjusting the compensation pressure difference to compensate the flow force, the flow control accuracy of the multi-way valve is improved, and the flow force compensation effect is obvious.

New results on an electropneumatic active seat suspension system

2000 ◽  
Vol 214 (5) ◽  
pp. 533-544 ◽  
Author(s):  
G. J. Stein
Keyword(s):  
Vibration Control ◽  
Control Valve ◽  
Pressure Control ◽  
Random Excitation ◽  
Vertical Vibration ◽  
Flow Control Valve ◽  
Heavy Vehicles ◽  
Seat Suspension ◽  
Pressure Control Valve ◽  
Vibration Compensation

A vibration control system with an air spring as the actuator and proportional electropneumatic control has been developed at the Institute of Materials and Machine Mechanics, Bratislava. As the electropneumatic transducer, a proportional pressure control valve is used in contrast to the previously used proportional flow control valve. The vibration control is facilitated by a combination of a ‘sky hook’ feedback loop and a feedforward loop working on the so-called ‘sky cloud’ principle, compensating base vertical vibration. Good agreement between simulation results and measurement on a laboratory dummy system was observed. The dummy system was also subjected to narrow-band random excitation, prescribed for standardized laboratory tests of driver's seats. The improvement in driver's seat vibration control properties owing to the feedforward vibration compensation is 2.5-fold, i.e. by 8 dB in comparison with ‘sky hook’ feedback damping only. The system could be used for vibration control in automotive applications, especially for vehicles with an unsprung chassis (earth-moving machines, wheeled tractors) and in the heavy vehicles sector.

scholarly journals Optimal Design of Safety Instrumented Systems for Pressure Control of Methanol Separation Columns in the Bisphenol A Manufacturing Process

2016 ◽  
Author(s):  
In-Bok Lee ◽  
Insung Woo
Keyword(s):  
Bisphenol A ◽  
Control Valve ◽  
Pressure Control ◽  
Production Plant ◽  
Relief Valve ◽  
Safety Integrity Level ◽  
Separation Column ◽  
Potential Risks ◽  
Separation Columns ◽  
Accident Scenarios

Bisphenol A production plant possesses considerable potential risks in the top of the methanol separation column, as pressurized acetone, methanol and water are processed at an elevated temperature, especially in the event of an abnormal pressure increase due to sudden power outage. This study assesses the potential risks in the methanol separation column through hazard and operability assessment and evaluates the damages in the case of fire and explosion accident scenarios. The study chooses three leakage scenarios: a 5-mm puncture on the methanol separation column, a 50-mm diameter fracture of a discharge pipe and a catastrophic rupture, and simulates using Phast (Ver. 6.531) the concentration distribution of scattered methanol, thermal radiation distribution of fires and overpressure distribution of vapor cloud explosions. Implementation of safety instrumented system equipped with two-out-of-three voting as a safety measure can detect overpressure at the top of the column and shut down the main control valve and the emergency shutoff valve simultaneously, all at the same time. By applying safety integrity level of three, the maximal release volume of the safety relief valve can be reduced and therefore, the design capacity of the flare stack can also be reduced. Such integration will lead to improved safety at a reduced cost.

Exponential Tracking Control of a Hydraulic Proportional Directional Valve and Cylinder via Integrator Backstepping

2002 ◽  
Author(s):  
J. Chen ◽  
W. E. Dixon ◽  
J. R. Wagner ◽  
D. M. Dawson
Keyword(s):  
Pressure Drop ◽  
Tracking Control ◽  
Mechanical Load ◽  
Control Valve ◽  
Transient Behavior ◽  
Transportation Systems ◽  
System Response ◽  
Hydraulic Systems ◽  
Control Valves ◽  
Directional Control

Hydraulic systems are widely used in manufacturing processes and transportation systems where energy intensive operations are performed and “machine” control is vital. A variety of flow control products exist including manual directional control valves, proportional directional control valves, and servo-valves. The selection of a control valve actuation strategy is dependent on the system response requirements, permissible pressure drop, and hardware cost. Although high bandwidth servo-valves offer fast response times, the higher expense, susceptibility to debris, and pressure drop may be prohibitive. Thus, the question exists whether the economical proportional directional control valve’s performance can be sufficiently enhanced using nonlinear control strategies to begin approaching that of servo-valves. In this paper, exponential tracking control of a hydraulic cylinder and proportional directional control valve, with spool position feedback, is achieved for precise positioning of a mechanical load. An analytical and empirical mathematical model is developed which describes the transient behavior of the integrated components. A nonlinear backstepping control algorithm is designed to accommodate inherent system nonlinearities.

A Fluidic Fuel Control Valve for Turbine Engines

1971 ◽  
Author(s):  
R. L. Wilcox ◽  
J. H. Shadowen
Keyword(s):  
Pressure Drop ◽  
Control Valve ◽  
Low Flow ◽  
Fuel System ◽  
Relief Valve ◽  
Flow Rates ◽  
Turbine Engine ◽  
Heat Effects ◽  
In Series ◽  
Large Flow

A fluidic valve, consisting of a swirl chamber with tangential and radial inlets and a single outlet, has been used to provide uniform fuel distribution to the nozzles in an annular combustor designed for a small turbine engine. The fuel nozzles were of the air atomizing type, with large flow passages for contamination tolerance. Pressure drop across the nozzles was too small at low fuel flows to overcome hydraulic heat effects and uniformly distribute the fuel to the nozzles. A fluidic valve installed in series with each nozzle provided sufficient pressure drop to distribute the fuel at low flow rates without requiring exceptionally high fuel pressures at large flow rates. The fluidic valves were fed by a dual man fold fuel system. Fuel flow was divided between the two manifolds, which were connected separately to the tangential and radial inlets of the fluidic valves, by a pressure relief valve. The flow schedule of the system was similar to that of a dual orifice pressure atomizing fuel system. Turn down requirements of the system were 40:1.

Modeling and Stability of a Hydraulic Load-Sensing Pump With Investigation of a Hard Nonlinearity in the Pump Displacement Control System

2014 ◽  
Author(s):  
Zachary D. Wagner ◽  
Roger Fales
Keyword(s):  
Control System ◽  
Stability Analysis ◽  
Flow Control ◽  
Control Valve ◽  
Pressure Control ◽  
Flow Control Valve ◽  
Pump System ◽  
Load Sensing ◽  
Pressure Control System ◽  
The Stability

Certain types of Load-sensing (LS) pumps utilize a hydro-mechanical control system designed to regulate the pressure difference, or margin pressure, between the inlet and outlet of a flow control valve. With a constant margin pressure, predictable flow control can be achieved by controlling the orifice area of the flow control valve. In this work, the stability of the pressure control system will be investigated. A combination of linear analysis and nonlinear analysis is employed to assess the stability of a particular LS pump system. Among many nonlinearities present in the hydro-mechanical system, of particular interest is the saturation inherent in the actuator that is used to displace the pump swash plate and the saturation within the 3-way spool valve that permits flow to reach the actuator. This saturation nonlinearity has been isolated from the rest of the system to enable stability analysis. Analysis of model characteristics is used to make conclusions about the stability of the system consisting of interconnected linear and nonlinear portions. The stability analysis is compared to results obtained through a simulation study using a nonlinear model based on first principles.

Multidisciplinary Design Optimization of a High-Flow Control Valve

2013 ◽  
Vol 300-301 ◽  
pp. 1454-1457 ◽  
Author(s):  
Fang Cao ◽  
Yong Wang
Keyword(s):  
Flow Control ◽  
Design Optimization ◽  
Multidisciplinary Design Optimization ◽  
Control Valve ◽  
Pressure Control ◽  
High Flow ◽  
Field Analysis ◽  
Multidisciplinary Design ◽  
Practical Significance ◽  
Flow Control Valve

According to the real structure and work condition of a high-flow gas pressure control valve used in recycling generating electricity project, a multidisciplinary design optimization (MDO) model is set up. Taking the structure and flow field analysis results as designing criterion, the MDO framework is put forward, which realizing the integration of multidisciplinary and two physical fields of control valve. To ensure that the gas transmission capacity which is the design prerequisite, the optimization takes reducing noise of control valve as system goal, while the valve wall thickness and flow velocity are decreased. And the Reynolds number, stress intensity and body total weight are also meet requirements. From the standpoint of fluid and structure, to realize MDO is of great practical significance for advancing research level of high-flow control valves.

Development and Analysis of Small Scale Water Accumulator by Using Piston Type

2015 ◽  
Vol 761 ◽  
pp. 191-195
Author(s):  
Mohd Noor Asril Saadun ◽  
Ahmad Anas Yusof ◽  
Muhammad Ismail Zakaria
Keyword(s):  
Hydraulic System ◽  
Environmental Concern ◽  
Control Valve ◽  
Pressure Control ◽  
Small Scale ◽  
Auxiliary Component ◽  
Hydraulic Hybrid ◽  
Directional Control ◽  
Weighing Method ◽  
Pressure Control Valve

An accumulator is an auxiliary component in a hydraulic system as it stores the energy and avoids the pump from running continuously through the system which can reduce the pumps life. The accumulator is also used as the power source in the hydraulic hybrid system to accelerate the vehicle. A common hydraulic system uses the hydraulic oil as their working medium, but there is an application using water due to the high accessibility and environmental concern. In this paper, an accumulator is developed by using weighing method to increase the pressure in the system. This system uses water as a medium to provide clean environment as well as safe for mobile purpose. The system includes electric motor, water pump, directional control valve, pressure control valve and motor hydraulic. The performance of the accumulator is obtained by measuring the ratio of output and input pressure. The source of electricity is varied by using an inverter to control the frequency and the power of the pump. From the experiment, the pressure output and flow rate decreased with the increasing of the loads on top of the accumulator, while the pressure loss increased with the number of load. The operational frequency is optimal at a low reading compared to a higher frequency.

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