Force Control of Hydraulic Actuators using Additional Hydraulic Compliance

Pérez, Job Angel Ledezma; Pieri, Edson Roberto De; Negri, Victor Juliano De

doi:10.5545/sv-jme.2018.5339

Cited by 5 publications

(7 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The valve consists of a monolithic block inside of which flow paths have been hollowed out. Also, a differential valve (3) and two throttle check valves (1), (2) have been placed in the block. The valve is adapted for a direct connection to the electrically controlled WE6-type control valve.…”

Section: Working Principle Of Analysed Valvementioning

confidence: 99%

“…13. Test bench schematic: (1) pump, (2), (10) relief valve, (3) differential valve, (4), (9) throttle valve, (5) hydraulic actuator, (6), (8), (11) check valve, (7) control valve, (12) LVDT transducer, (13) pressure transducers, (14) flow meter, (15) DAQ card and PC…”

Section: Test Bench Experimentsmentioning

confidence: 99%

“…The supply unit includes a pump (1) and a relief valve (2). The UZFD6 prototype valve consists of a differential valve (3), two check valves (6), (8) and two adjustable throttle valves (4), (9).…”

Section: Test Bench Experimentsmentioning

confidence: 99%

“…Experimental results showed high energy efficiency and excellent control performance of the automatic switching system between the first idle speed, the second idle speed, and the normal operating speed of a hydraulic cylinder. Pérez et al [2] presented a robust controller for the hydraulic actuator force control, while Wang et al [3] proposed a novel position-pressure master-slave controller for the hydraulic servo system. Moreover, Wang and Wang [4] developed an energy-saving control strategy with a load-sensing structure including a load-sensing pump, a proportional relief valve, a throttle valve, and an adaptive control algorithm.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Numerical and Experimental Study of a Novel Valve Using the Return Stream Energy to Adjust the Speed of a Hydraulic Actuator

Filo¹,

Lisowski²,

Kwiatkowski³

et al. 2019

SV-JME

View full text Add to dashboard Cite

This article discusses the possibility of increasing the speed of movement of a single-sided hydraulic cylinder piston rod using a fluid stream from the return line. Directing the return stream back to the supply line instead of the fluid reservoir causes significant increase in the inflow rate to the actuator. This situation may arise when the piston rod of the cylinder is not fully loaded on part of the movement range. As part of this work, we proposed a solution in the form of a novel control valve, consisting of a throttle valve and a differential valve controlled by the pressure difference between the supply line and the return line. A geometric model was created using SolidWorks, then a simulation model was made in Matlab/Simulink. Next, simulations were carried out to prove that the use of the return fluid stream gives a possibility of a significant increase in the piston rod speed. The results of the numerical analyses were verified on a test bench where the valve prototype was tested. Speed characteristics of the piston rod against both payload force and throttle valve setting were determined. High convergence with the simulation results was obtained. It has also been confirmed that the proposed solution can be advantageous in practical applications.

show abstract

Section: Working Principle Of Analysed Valvementioning

confidence: 99%

Section: Test Bench Experimentsmentioning

confidence: 99%

Section: Test Bench Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical and Experimental Study of a Novel Valve Using the Return Stream Energy to Adjust the Speed of a Hydraulic Actuator

Filo¹,

Lisowski²,

Kwiatkowski³

et al. 2019

SV-JME

View full text Add to dashboard Cite

show abstract

“…[14,15]. Recently, Ledezma et al [16] presented a novel approach for improving the hydraulic force tracking performance by adding hydraulic compliance with special hoses, and this method was validated via simulation and experiments. In contrast to the above methods using linear control theories, the nonlinear control strategies with rigorous Lyapunov stability have aroused many researchers' attention [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Real-time nonlinear adaptive force tracking control strategy for electrohydraulic systems with suppression of external vibration disturbance

Zhu

Shen

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

View full text Add to dashboard Cite

Electrohydraulic system (EHS) is extensively utilized in experimental testing field for exerting forces on specimen, and in many occasions, force tracking of EHS is confronted with external motion disturbance, which seriously deteriorates the force tracking performance. To address this problem, a real-time nonlinear adaptive force control strategy is developed in this paper. On the basis of the established nonlinear model for EHS, the proposed nonlinear adaptive force controller is obtained by a recursive backstepping method, where both servo-valve nonlinearity and parametric uncertainties of general electrohydraulic systems are accounted for during the controller design procedure. The first advantage for the proposed controller lies in the fact that the actuator's vibration disturbance information is utilized to serve the purpose of accurate force tracking. Besides, parametric uncertainties are effectively handled by the developed online adaptive updating law to achieve a higher force replication performance. Moreover, rigorous Lyapunov stability of the proposed controller is guaranteed. Finally, comparative experiments are implemented on a uniaxial EHS through xPC/Target rapid prototyping technique, and the relevant results validate the feasibility of the developed controller.

show abstract

H∞ Loop Shaping Control Design of the Rotational Velocity of a Hydraulic Motor

2021

IJOMAM

View full text Add to dashboard Cite

In this work, a hydraulic system in which the hydraulic motor velocity is controlled using a variable speed pump. A comprehensive dynamic model was created and the performance and stability of the open loop system were assessed. Then, PID and loop shaping H-infinity controllers were designed with the aim of improving the system performance. The multiplicative uncertainty, that is associated with uncertain parameters in the speed controlled velocity control system, was studied. Two parameters were introduced in the uncertainty analysis; the leakage coefficient and the viscous friction coefficient. The requirements of the system performance were defined in the frequency domain that was used to determine the robustness of the closed-loop velocity control system. The results showed that the proposed open loop hydraulic system is stable. It was also shown that using feedback control greatly improves the system performance. The performance of the nominal system, based on the obtained results, with H∞ controller was found to be better than that of the system with PID controller. It was found that the H∞ controller has the advantages of having robust performance by considering the uncertainty in addition to not having an integral control as in the PID control system. In addition, it was found that the system with the PID controller did not achieve robust performance.

show abstract

Force Control of Hydraulic Actuators using Additional Hydraulic Compliance

Cited by 5 publications

References 17 publications

Numerical and Experimental Study of a Novel Valve Using the Return Stream Energy to Adjust the Speed of a Hydraulic Actuator

Numerical and Experimental Study of a Novel Valve Using the Return Stream Energy to Adjust the Speed of a Hydraulic Actuator

Real-time nonlinear adaptive force tracking control strategy for electrohydraulic systems with suppression of external vibration disturbance

H∞ Loop Shaping Control Design of the Rotational Velocity of a Hydraulic Motor

Contact Info

Product

Resources

About