Development of high-response piezo servovalves for improved performance of electrohydraulic cylinder drives
type: CreativeWork
description: This book deals with the development and testing of high-response piezo-servovalves for improved performance of electrohydraulic cylinder drives. Performance improvement means in the context of this work an enhancement of reference and disturbance response of the drive in a closed-loop pressure and position control. Reference and disturbance responses determine the precision of the drive which influences product quality and motion accuracy in stationary and mobile applications. This thesis shows by means of linearised mathematical models that the drive performance can be significantly improved by high dynamics of the control valve. The increase in valve dynamics can be achieved by the use of piezoelectric actuators, which outmatch the response of common electromechanical valve actuators. Within the scope of this work two different novel high-response piezo-servovalves are prototyped. These are four-way directional flow control valves with linear spools. The book presents different steps of the design and development process of the valves such as conceptual design, calculation, dimensioning, manufacturing, design of internal valve control, testing according to the internationally standardized procedures and comparison to the performance of common servovalves. The achieved dynamics of the piezo-servovalves surpasses the response of the conventional valves. Exemplary investigations of an electrohydraulic cylinder drive show an improved reference response of pressure control by 50% and an enhanced disturbance response of position control by 40% due to the use of the piezo-servovalve at the drive. This work demonstrates that the commercially available piezo-actuators can be successfully implemented in industrial hydraulic valves, bringing advantages for the overall drive performance. The high reliability and endurance of the piezo-actuators have already been proven by the use in common rail fuel injectors in the automobile industry since 2002. Taking into account falling…
abstract: This book deals with the development and testing of high-response piezo-servovalves for improved performance of electrohydraulic cylinder drives. Performance improvement means in the context of this work an enhancement of reference and disturbance response of the drive in a closed-loop pressure and position control. Reference and disturbance responses determine the precision of the drive which influences product quality and motion accuracy in stationary and mobile applications. This thesis shows by means of linearised mathematical models that the drive performance can be significantly improved by high dynamics of the control valve. The increase in valve dynamics can be achieved by the use of piezoelectric actuators, which outmatch the response of common electromechanical valve actuators. Within the scope of this work two different novel high-response piezo-servovalves are prototyped. These are four-way directional flow control valves with linear spools. The book presents different steps of the design and development process of the valves such as conceptual design, calculation, dimensioning, manufacturing, design of internal valve control, testing according to the internationally standardized procedures and comparison to the performance of common servovalves. The achieved dynamics of the piezo-servovalves surpasses the response of the conventional valves. Exemplary investigations of an electrohydraulic cylinder drive show an improved reference response of pressure control by 50% and an enhanced disturbance response of position control by 40% due to the use of the piezo-servovalve at the drive. This work demonstrates that the commercially available piezo-actuators can be successfully implemented in industrial hydraulic valves, bringing advantages for the overall drive performance. The high reliability and endurance of the piezo-actuators have already been proven by the use in common rail fuel injectors in the automobile industry since 2002. Taking into account falling…
author: Reichert, Maxim
language: eng
keywords: info:eu-repo/classification/ddc/620, Elektrohydraulisches Servoventil, Servoventil, Druckregelung, Lageregelung, Aktorik, Hydraulikzylinder, Dynamik, Ventil, Wegeventil, Hydroventil, Elektrohydraulik, Numerische Strömungssimulation, Ingenieurwissenschaften, Piezo, Laststeifigkeit, Folgeverhalten, Störverhalten, Strömungskraft, servovalve, control, electrohydraulic cylinder, load stiffness
date published: 2010
date modified: 2026-07-30T19:43:35Z
provider: RWTH Aachen University
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Shaker