Electro-hydraulic proportional control of twin-cylinder hydraulic elevators

Li, Ké; Mannan, MA; Xu, Min; Xiao, Ziyuan

doi:10.1016/s0967-0661(01)00003-x

Cited by 47 publications

(20 citation statements)

References 3 publications

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“…Many synchronisation control approaches have been proposed to achieve the motion synchronisation in different areas (see Sun and Mills (2002), Sun (2003), Zhou, Shen, and Tamura (2006), Liu, Shan, and Sun (2007), Sun, Shao, and Feng (2007) and references therein), especially in the engineering systems driven by electro-hydraulic servo systems, such as the lift system in Sun and Chiu (2002), Li, Chen, Xiao, and Xu (2003), Chen, Liao, and Cheng (2007) and Chen, Liu, Cheng, and Chiu (2008), the elevator system in Li and Mannan (2001), the pushing railway bridge machinery in Li, Li, and Yang (2006) and the pressing down position system for cold rolling mill in Zhao, Fang, Li, and Han (2007). However, existing synchronisation approaches in the HAGC systems of cold rolling mills still have challenges due to the inherent nonlinearities of the hydraulic servo system, the uncertainties of load variation and the delay existing in the measurement of thickness.…”

Section: Introductionmentioning

confidence: 99%

Reduced-order observer-based robust synchronisation control of cold rolling mills with measurement delay

Jiao

Mei

2010

International Journal of Control

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To improve the quality of strip thickness, synchronisation control is investigated for cold rolling mills driven by dual-cylinder electro-hydraulic servo systems. Realising synchronised control in hydraulic automatic gauge control (HAGC) systems of cold rolling mills has challenges with not only the inherent nonlinearities of hydraulic servo systems and uncertainties of load variation but also measurement delay of strip thickness. Since all states are not measurable in practice, output feedback robust synchronisation control problem should be addressed for uncertain nonlinear systems with output delay. Thus, a reduced-order observer-based robust synchronous controller is presented by employing Lyapunov functional stability theory. The controller designed by incorporating the integral of the position synchronisation error of two pistons into state variables successfully guarantees asymptotic convergence to zero of both tracking errors and synchronisation error simultaneously regardless of the nonlinearities and uncertainties as well as the measurement delay. Simulation results in a model obtained from a real cold strip rolling mill demonstrate the effectiveness of the approach.

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Section: Introductionmentioning

confidence: 99%

Reduced-order observer-based robust synchronisation control of cold rolling mills with measurement delay

Jiao

Mei

2010

International Journal of Control

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“…From Equations (2), (4) and (5), the flow continuity equation of the hydraulic cylinder can be expressed as [11]…”

Section: Of 23mentioning

confidence: 99%

“…Moreover, the electro-hydraulic proportional system (EHPS) reduces the level of required oil filtration and is more cost-effective than an electro-hydraulic servo system (EHSS) [2]. As a consequence, it is becoming a crucial component of robotic excavators [3], shield tunneling machines [4], and hydraulic elevators [5]. Parallel mechanisms can perform more complex operations in restrained space and implement more powerful output forces/torques [6].…”

Section: Introductionmentioning

confidence: 99%

“…The proportional-integral-derivative (PID) controller is widely used in industrial automation applications. A low non-synchronous error is guaranteed by applying a constrained step PD controller in a twin-cylinder hydraulic elevator [5]. Motion coupling is an essential obstacle in synchronous control, so the decoupling control method is proposed [7].…”

Section: Introductionmentioning

confidence: 99%

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Active Disturbance Rejection Position Synchronous Control of Dual-Hydraulic Actuators with Unknown Dead-Zones

Wang

Zhao

Liu

et al. 2020

Sensors

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In this paper, an integrated control strategy of position synchronization control for dual-electro-hydraulic actuators with unknown dead-zones is proposed. The unified control scheme consists of two parts: One is adaptive dead-zone inverse controllers of each hydraulic actuator to offset the unknown dead-zones. The other is the linear active disturbance rejection controller (LADRC) for position synchronization error. First, the model of the electro-hydraulic proportional position control system (EPPS) was identified by the forgetting factor recursive least square (FFRLS) algorithm. Next, the model reference dead-zone inverse adaptive controller (MRDIAC) was developed to compensate for the delay of actuator response caused by unknown proportional valve dead-zones. Meanwhile, the validity of the adaptive law was proven by the Lyapunov theory. Therefore, the position control accuracy of each hydraulic actuator is guaranteed. Besides, to improve the precision of position synchronization control of dual-hydraulic actuators, a simple and elegant synchronous error-based LADRC was adopted, which applies the total disturbances design concept to eliminate and compensate for motion coupling rather than cross-coupling technology. The performance of the proposed control solution was investigated through extensive comparative experiments based on a hydraulic test platform. The experimental results successfully demonstrate the effectiveness and practicality of the proposed method.

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“…The PDF controller scheme had shown to be an appropriate technique to achieve the desired velocity pattern. Furthermore, this system guarantees low non-synchronous error [10]. By bringing the proportional and derivative control actions to the feedback path, it is possible to choose larger values for Kp and Td than those possible by the PID control.…”

Section: Pdf Controller Overviewmentioning

confidence: 99%

PDF Versus Pid Controller for Active Vehicle Suspension

Elattar¹,

Metwalli²,

Rabie³

2016

The International Conference on Applied Mechanics and Mechanica

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The main objective of this work is to investigate the dynamic performance of vehicle active suspension systems. A design for quarter vehicle equipped with active suspension system is presented. The dynamic behavior of the system evaluated by developing a mathematical model for the controlled system and developing a computer simulation program. The system incorporates an electrohydraulic servo system controlled by a proportional, integral, derivative (PID) controller. Alternatively, a pseudo derivative feedback controller (PDF) is used. The parameters of both of the controllers were estimated and tuned to minimize the integrated of square error (ISE) and integral of time absolute error (ITAE) criterions. The proportional, derivative (PD) controller gave the shortest settling time. The PDF controller showed negligible maximum percentage overshoot. While the PID showed a maximum percentage overshoot within 5%. The proportional, integral (PI) and PD showed longer settling time.

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Electro-hydraulic proportional control of twin-cylinder hydraulic elevators

Cited by 47 publications

References 3 publications

Reduced-order observer-based robust synchronisation control of cold rolling mills with measurement delay

Reduced-order observer-based robust synchronisation control of cold rolling mills with measurement delay

Active Disturbance Rejection Position Synchronous Control of Dual-Hydraulic Actuators with Unknown Dead-Zones

PDF Versus Pid Controller for Active Vehicle Suspension

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