Title:Linear Motion Control with a Low Power Hydraulic Switching Converter - Part I: Concept, Test Rig, SimulationsAuthor(s):Helmut Kogler,  Rudolf ScheidlAbstract:Switching control can also be employed for hydraulic motion control. Among the many hydraulic switching methods investigated so far, the so called hydraulic buck converter convinces by its simplicity. It consists of two switching valves, an inertance pipe, and a hydraulic accumulator to flatten the pulsation resulting from switching. This accumulator entails significant softness and nonlinearity which, in combination with sealing friction of the hydraulic cylinder, may lead to inferior performance with simple control concepts. In this paper a sub kilowatts hydraulic buck converter, its components, design, dimensioning, and steady state performance characteristics are presented first. Measurements on a test rig for linear motion employing a simple P-controller show the necessity of a model based control to achieve the desired control performance. Therefore, a dynamic model of the converter and the linear drive is derived and studied by simulations. It is shown, that the model incorporates the relevant physical effects and that it is qualified for a flatness based control, which is derived in Part II of the publication.Journal:Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Eng.ISSN:0959-6518Page Reference:page 667-684, 24 page(s)Publishing:3/2015Volume:229Number:8

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