Performance Analysis of Directional Control Valve: An Overview

2014 ◽  
Vol 592-594 ◽  
pp. 1983-1987
Author(s):  
Ramashankar Paswan ◽  
Jayanta Das ◽  
N. Kumar ◽  
Ajit Kumar ◽  
Santosh Kumar Mishra ◽  
...  
Keyword(s):  
Control Valve ◽  
Open Loop ◽  
Compressed Air ◽  
Hydraulic Control ◽  
Control Valves ◽  
Directional Control ◽  
Full State ◽  
Full State Feedback ◽  
High Bandwidth ◽  
Valve Control

Directional control valves start, stop or change the direction of flow in compressed air applications. To understand the different applications of compressed air and how valves are used, one must first have knowledge of the kinds and types of valves used by industries. This paper studies local valve control of the electro-hydraulic system. The slow response of hydraulic control valve usually becomes the hold-up of whole system performance. Although fast valves (e.g. high-bandwidth servo-valves) are available, they are far more expensive than slow valves (e.g. proportional directional control valves). To improve the performance of proportional directional control valves, three different types of controllers are synthesized. Firstly, based on the pole zero cancellation technique, an open loop compensator is designed which requires the accurate valve dynamic model information; Secondly, a full state feedback adaptive robust controller (ARC) is synthesized, which effectively takes into account the effect of parametric uncertainties and uncertain nonlinearities such as friction force and flow force. Finally, an output feedback ARC controller is synthesized to address the problem of un measurable states. Keywords: valve, hydraulic device, Simulink.

Performance Improvement of Proportional Directional Control Valves: Methods and Experiments

2000 ◽  
Author(s):  
Fanping Bu ◽  
Bin Yao
Keyword(s):  
Control Valve ◽  
Open Loop ◽  
Parametric Uncertainties ◽  
Hydraulic Control ◽  
Tracking Accuracy ◽  
Control Valves ◽  
Output Tracking ◽  
Directional Control ◽  
Full State Feedback ◽  
High Bandwidth

Abstract This paper studies local valve control of the electro-hydraulic system. The sluggish response of hydraulic control valve usually becomes the bottleneck of whole system performance. Although fast valves (e.g. high-bandwidth servo-valves) are available, they are far more expensive than slow valves (e.g. proportional directional control valves). To improve the performance of proportional directional control valves, three different types of controllers are synthesized. Firstly, based on the pole zero cancellation technique, an open loop compensator is designed which requires the accurate valve dynamic model information; Secondly, a full state feedback adaptive robust controller (ARC) is synthesized, which effectively takes into account the effect of parametric uncertainties and uncertain nonlinearities such as friction force and flow force. Finally, an output feedback ARC controller is synthesized to address the problem of unmeasurable states. Theoretically, the proposed ARC controllers guarantee a prescribed output tracking transient performance and final tracking accuracy while achieving asymptotic output tracking in the presence of parametric uncertainties. Comparative experimental results are obtained to show the advantages and limitations of each method.

scholarly journals Dynamic behaviour of pneumatic actuators in open-loop controlled by proportional valves

2020 ◽  
Vol 180 ◽  
pp. 04012
Author(s):  
Valentin Nicolae Cococi ◽  
Carmen-Anca Safta ◽  
Constantin Călinoiu
Keyword(s):  
Control Valve ◽  
Open Loop ◽  
Pneumatic Actuator ◽  
Control Technique ◽  
Hydraulic Control ◽  
Pneumatic Actuators ◽  
Pneumatic Control ◽  
Directional Control ◽  
New Generation ◽  
Directional Control Valve

The development of proportional and servo-mechanisms hydraulic control technique offered the premises of the development of pneumatic control, too. Despite the disadvantages of the nonlinearities appeared in the pneumatic systems (air compressibility being one of the causes), the new generation of proportional equipment made it possible to have a good quality pneumatic control system in our days. The goal of the paper is to demonstrate, by using numerical simulation technique, that the proportional valves used in pneumatic actuator drives occur at a good system dynamic at a reasonable cost as against to the directional control valve as it usually used in pneumatic actuator drives.

Paper 6: Hydraulic Control of Valves in Tankers

1965 ◽  
Vol 180 (12) ◽  
pp. 121-131
Author(s):  
Victor Pomper
Keyword(s):  
Control System ◽  
Remote Control ◽  
Hydraulic Cylinder ◽  
Free Flow ◽  
Centralized Control ◽  
Hydraulic Control ◽  
Level Indicator ◽  
Control Valves ◽  
Directional Control ◽  
Oil Tanker

The 47 800-ton vessel Altair of the Compagnie Navale des Pétroles (C.N.P.) was the first oil-tanker to be equipped with a hydraulic remote-control system of cargo valves. The vessel was delivered at the beginning of May 1959. The opening and closing operations of the valves were controlled from a central panel which was fitted with manually operated directional control valves. The panel was located in the cargo valves' remote-control room which also housed the indispensable remote-controlled level-indicator board. Since then the application of hydraulic remote-controlled valves has become widespread and has taken one of two forms : that of a centralized control system or that of directional control valves located on the deck. Remote-controlled valves are either gate valves operated by a hydraulic cylinder, or butterfly valves operated by a hydraulic rotary actuator. The application of remote-control also allowed the setting up of the ‘free-flow’ system which uses hydraulically operated bulkhead valves. The first ‘free-flow’ oil-tanker was the Sirius of the C.N.P.; it was delivered in 1961. At present it appears that there exists an ever-increasing trend towards automation in the loading and unloading of tanker cargoes. This is accomplished by electrically operated directional control valves, which are connected with electrically programmed systems or with electronic servo-controls.

Adaptive, High Bandwidth Control of a Hydraulic Actuator

1996 ◽  
Vol 118 (4) ◽  
pp. 714-720 ◽  
Author(s):  
J. E. Bobrow ◽  
K. Lum
Keyword(s):  
Adaptive Controller ◽  
Hydraulic Actuator ◽  
Controlled Systems ◽  
Full State ◽  
Parameter Variations ◽  
Full State Feedback ◽  
Bandwidth Control ◽  
High Bandwidth ◽  
On Line ◽  
Proportional Controller

Hydraulic servovalve controlled systems contain many time-varying dynamic characteristics that are difficult to model Controllers for such systems must either adapt to these changing parameters or be robust enough to handle the parameter variations. In order to achieve the highest possible bandwidth, an adaptive controller is developed for the system that uses full-state feedback for simultaneous parameter identification and tracking control This controller takes into account the hydraulic fluid compressibility with an on-line identification scheme Experimental results demonstrate a four fold improvement in bandwidth as compared to a conventional fixed gain proportional controller.

A Linear Time Varying Model for On-Off Valve Controlled Pneumatic Actuators

1990 ◽  
Vol 112 (4) ◽  
pp. 740-747 ◽  
Author(s):  
C. Kunt ◽  
R. Singh
Keyword(s):  
Linear Time ◽  
Digital Simulation ◽  
Control Valve ◽  
Open Loop ◽  
Rotary Valve ◽  
Pneumatic Actuators ◽  
Linear Time Invariant ◽  
Directional Control ◽  
Actuation Systems ◽  
Time Invariant

A new linear time varing (LTV) model has been developed for open loop, on-off valve controlled pneumatic actuation systems. This formulation is based on a periodic profile description for variable operating points and directional control valve flow variations. The dynamic behavior of the example case, a single acting cylinder controlled by a two way-two port rotary valve, under the cyclic pressure loading is obtained using the proposed LTV model. Experimental evidence and digital simulation predictions based on the nonlinear mathematical equations validate the analytical formulation. The proposed LTV model is found to be better and more applicable than linear time invariant (LTI) models used previously by many investigators.

Adaptive Tracking Control of an Air Powered Robot Actuator

1993 ◽  
Vol 115 (3) ◽  
pp. 427-433 ◽  
Author(s):  
B. W. McDonell ◽  
J. E. Bobrow
Keyword(s):  
Tracking Control ◽  
Position Control ◽  
Adaptive Controller ◽  
Pneumatic Actuator ◽  
Tracking Accuracy ◽  
Nonlinear Characteristics ◽  
Adaptive Tracking Control ◽  
Full State ◽  
Full State Feedback ◽  
High Bandwidth

An adaptive controller is presented for a one-degree-of-freedom pneumatic actuator. The control law uses full-state feedback for simultaneous parameter identification and tracking control. For position control, a pneumatic actuator with high bandwidth is difficult to obtain because of the compressibility of air and the nonlinear characteristics of air flowing through a variable area orifice. Most previous controllers for gas powered actuators were relatively limited fixed gain or on-off type controllers with low tracking accuracy. Experimental results demonstrate that tracking performance comparable to electric servomotors can be obtained using the algorithm presented despite the nonlinearities and compressibility of air.

scholarly journals The Characteristic Improvement of Electromagnetic Proportional Directional Control Valve

2018 ◽  
Vol 2018 ◽  
pp. 1-8
Author(s):  
Hua Zhang
Keyword(s):  
Temperature Rise ◽  
Electromagnetic Force ◽  
Optimization Design ◽  
Control Valve ◽  
Hydraulic Control ◽  
The Finite Element Method ◽  
Directional Control ◽  
Burn Out ◽  
High Temperature Rise ◽  
Directional Control Valve

The electromagnetic proportional directional control valve is widely used in hydraulic control system and its typical faults are not enough electromagnetic force and too high temperature rise to burn out the coil. The magnetic field and coil temperature field distribution of the control valve are modeled and analyzed by using the finite element method. The influence laws of the geometry and parameters on electromagnetic force are analyzed. Furthermore, the influence of coil control current and heat transfer coefficient on the temperature rise of coil is analyzed, which provides a theoretical basis for the reliability optimization design of electromagnetic proportional directional control valve.

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 novel multi-objective optimization algorithm for Pareto design of a fuzzy full state feedback linearization controller applied on a ball and wheel system

2021 ◽  
pp. 014233122110561
Author(s):  
Rahmat Abedzadeh Maafi ◽  
Shahram Etemadi Haghighi ◽  
Mohammad Javad Mahmoodabadi
Keyword(s):  
Optimization Algorithm ◽  
Feedback Linearization ◽  
State Feedback ◽  
Standard Test ◽  
Open Loop ◽  
Multi Objective Optimization ◽  
Pareto Solutions ◽  
Multi Objective ◽  
Full State ◽  
Full State Feedback

The control and stabilization of a ball and wheel system around the equilibrium point are challenging tasks because it is an underactuated, nonlinear, and open-loop unstable plant. In this paper, Pareto design of a Fuzzy Full State Feedback Linearization Controller (FFSFLC) for the ball and wheel system based upon a novel multi-objective optimization algorithm is introduced. To this end, at first, a full state feedback linearization approach is employed to stabilize the dynamics of the system. Next, appropriate fuzzy systems are determined to tune the control gains. Then, a new multi-objective optimization algorithm is utilized to promote the proposed control scheme. This optimization algorithm is a combination of Simulated Annealing (SA) and Artificial Bee Colony (ABC) approaches benefiting advantages of the non-dominated Pareto solutions. To evaluate the capabilities of the suggested algorithm, its optimal solutions of several standard test functions are compared with those of five renowned multi-objective optimization algorithms. The results confirm that the proposed hybrid algorithm yields closer non-dominated Pareto solutions to the true optimal Pareto front with shorter runtimes than other algorithms. After selecting proper objective functions, multi-objective optimization of FFSFLC for the ball and wheel system is performed, and the results are compared with previous works. Simulations illustrate that the proposed strategies can accurately converge the system states to the desired conditions and yield superior robustness against disturbance signals in comparison with former studies.

Design Modeling and Control of a Lab-Scale Compressed Air Energy Storage (CAES) Testbed for Wind Turbines With Simulated Input and Demand Power Variability

2014 ◽  
Author(s):  
Farzad A. Shirazi ◽  
Pieter Gagnon ◽  
Perry Y. Li ◽  
James D. Van de Ven
Keyword(s):  
Energy Storage ◽  
Wind Turbines ◽  
Control Valve ◽  
Compressed Air ◽  
Offshore Wind ◽  
Hydraulic Control ◽  
Compressed Air Energy Storage ◽  
Test Bed ◽  
Modeling And Control ◽  
Power Disturbances

A Compressed Air Energy Storage (CAES) test-bed has been developed to experimentally demonstrate the energy storage concept proposed in [1] for offshore wind turbines. The design of the testbed has been adapted to the available air compression/expansion technology. The main components of the system consist of an open accumulator, a hydraulic pumpmotor, air compressor/expander, an electrical generator and load, a differential gearbox and a hydraulic control valve. These components are first characterized and then a dynamic model of the system has been developed. The objective is to regulate the output current/voltage of the generator while maintaining a constant accumulator pressure in the presence of input and demand power variations in the system. This is achieved by Proportional-Integrator (PI) control of pumpmotor displacement and field current of the generator. The stability of these controllers has been proved using an energy-based Lyapunov function. Experimental results for storage and regeneration modes have been presented showing excellent performance of the system in response to power disturbances.

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