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O+P Fluidtechnik 9/2016

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O+P Fluidtechnik 09/2016

STEUERUNGEN UND

STEUERUNGEN UND REGELUNGEN 02 Ideal STEAM circuit layout Simulation and Design Test Bench Experiments FORSCHUNG UND ENTWICKLUNG 03 Steps towards system validation Prototype Testing Building of Prototype 76 O+PFluidtechnik 9/2016

STEUERUNGEN UND REGELUNGEN load pressure, thereby reducing throttling. The swing drive is controlled using a variable displacement motor connected directly to the HP rail, so-called secondary control. The circuit allows flow leaving both linear and rotary actuators to be redirected into one of the accumulators, thus enabling the recovery of both potential and kinetic energy from the actuators. In essence, the machine is a hydraulic hybrid. In contrast to other hybrids, STEAM does not use any electrical storage devices or actuators. The already installed hydraulic system only needs to be modified, which keeps costs low and avoids unnecessary energy transformations. The robust and easy to maintain hydraulic hybrid technology increases profitability for operators, as they can expect an agile machine with considerably lower fuel consumption. Within the scope of a three-year government funded project and with the help of partners from industry the STEAM system has undergone thorough testing and been successfully validated. The VIP program funded by the German Ministry for Education and Research provided the Institute for Fluid Power Drive and Controls in Aachen the unique opportunity to experimentally validate the concepts and ideas underlying the STEAM system. As shown in Fig. 3, during the course of a three-year period from December 2012 till the end of 2015, the STEAM architecture has been tested step by step. To begin with, detailed simulation and design studies were carried out. These were critical for the subsequent component 04 Members of advisory board 06 STEAM prototype machine 05 Circuit layout of prototype machine with LS and STEAM O+PFluidtechnik 9/2016 77

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