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This paper is concerned with the application of switching technology to hydraulic actuation. Over the last 50 years with advances in power electronics, faster and faster static switches have been developed and applied to the control of motors. Hydraulic technology evolved in the opposite direction: switching control was not considered, and more and more accurate proportional flow/pressure control...
This paper presents analysis of a proposed mechanical design solution for improving the downcoiler operations on a hot strip steel rolling mill. The design solution incorporates a novel pneumatic/hydraulic hybrid cylinder, used to hold the downcoiler wrappers in position to guide the steel strip whilst coiling. A full size testing rig was constructed to fully test the new prototype cylinder. The data...
A bilateral hydraulic servo control system is build for teleportation force feedback. The bilateral servo system is a master-slave system in which the hydraulic force feedback joysticks works as the master part. The system control scheme is based on the control character, and a position-velocity force feedback scheme which shows good transparency on the condition of soft and unloaded is proposed by...
Damping changeability design and evaluation is the most fundamental issue at the beginning of any new semi active hydraulic damper or its control system development. In this study, the changeable damping strategy for the sky-hook control of a rail vehicle semi-active hydraulic damper, which has three parallel orifices, is designed. Fluid formulae for the changeable damping calculation under different...
The erecting process of a hydraulic erecting system was studied based on electro-hydraulic similarity principle, with the numerical simulation of the rapid-erection system of a multi-function missile launching vehicle as an example. The system modeling was based on ??knot point balance method??. The pressure-flow rate characteristics of hydraulic elements and cubage cavity were analyzed based on mathematic...
Vehicle suspension systems have been extensively explored in the past decades, contributing to ride comfort, handling and safety improvements. The new generation of power-train and propulsion systems, as a new trend in modern vehicles, poses significant challenges to suspension system design. Consequently, novel suspension concepts are required, not only to improve the vehicle's dynamic performance,...
In this paper, a mathematical model of a quarter-car suspension system equipped with a hydraulic strut mount is investigated. It is assumed that only suspension deflection is measured. In contrast to the conventional suspension model, in which the effect of a strut mount is not included, damping-spring characteristics of the hydraulic strut mount have been added. Then a modified skyhook control for...
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