Title:A Combined Variable Displacement - Digital Cylinder Hydraulic Drive for Large Presses with High Operating FrequenciesAuthor(s):Florian Meßner, Rudolf Scheidl, Rainer Haas, Hubert Gattringer, Klemens SpringerAbstract:This paper deals with a novel hydraulic drive for large presses, combining the benefits of well developed but spacedemanding displacement control with the simplicity and reliability of digital hydraulics. In order to achieve these objectives, a single cylinder actuated by a variable displacement pump is synchronized with a set of cylinders driven by ordinary on/off valves. This setup is investigated using numerical simulation, an adequate control strategy as well as an experimental setup. All in all, very satisfying results regarding positioning accuracy and operating frequency are achieved using a quite simple control strategy.Journal:Journal of Dynamic Systems, Measurement and ControlPublisher:ASMEISSN:0022-0434Page Reference:page 074502-1 to 5, 5 page(s)Publishing:7/2016Volume:138Number:7