Volume 3 – Conference

We are pleased to present the conference proceedings for the 12th edition of the International Fluid Power Conference (IFK). The IFK is one of the world’s most significant scientific conferences on fluid power control technology and systems. It offers a common platform for the presentation and discussion of trends and innovations to manufacturers, users and scientists. The Chair of Fluid-Mechatronic Systems at the TU Dresden is organizing and hosting the IFK for the sixth time. Supporting hosts are the Fluid Power Association of the German Engineering Federation (VDMA), Dresdner Verein zur Förderung der Fluidtechnik e. V. (DVF) and GWT-TUD GmbH. The organization and the conference location alternates every two years between the Chair of Fluid-Mechatronic Systems in Dresden and the Institute for Fluid Power Drives and Systems in Aachen. The symposium on the first day is dedicated to presentations focused on methodology and fundamental research. The two following conference days offer a wide variety of application and technology orientated papers about the latest state of the art in fluid power. It is this combination that makes the IFK a unique and excellent forum for the exchange of academic research and industrial application experience. A simultaneously ongoing exhibition offers the possibility to get product information and to have individual talks with manufacturers. The theme of the 12th IFK is “Fluid Power – Future Technology”, covering topics that enable the development of 5G-ready, cost-efficient and demand-driven structures, as well as individual decentralized drives. Another topic is the real-time data exchange that allows the application of numerous predictive maintenance strategies, which will significantly increase the availability of fluid power systems and their elements and ensure their improved lifetime performance. We create an atmosphere for casual exchange by offering a vast frame and cultural program. This includes a get-together, a conference banquet, laboratory festivities and some physical activities such as jogging in Dresden’s old town.:Group 8: Pneumatics Group 9 | 11: Mobile applications Group 10: Special domains Group 12: Novel system architectures Group 13 | 15: Actuators & sensors Group 14: Safety & reliabilit

Design and development of a gas management subsystem for a Brayton space power system

Gas management subsystem using xenon-helium working fluid designed for Brayton space power syste

Pienikokoisen esiohjatun digitaaliventtiilin kehittäminen

This thesis describes the design, manufacturing and testing of a miniature hydraulic on/off valve. The valve has a solenoid actuated hydraulic pilot stage. The on/off valve is designed to be used as a part of a digital flow control unit (DFCU). In this thesis is first designed a miniature solenoid actuator by using analytical equations and finite element simulations. A prototype of the actuator is built and tested. The designed actuator is used for actuating the pilot stage of the designed hydraulic valve. The design process of the hydraulic valve and simulations of the valve are presented. A DFCU prototype consisting of fourdesigned on/off valves is built and tested. The main parts of the DFCU prototype are four separate layers mounted together to form the necessary features for the magnetic circuits and the flow channels of the four valves. The physical size of a single on/off valve in the prototype is about 4,5 cm3. The maximum operating pressure of the designed valve exceeds 25 MPa. The opening response time of the valve is 1,3 to 1,6 ms and the closing response time between 1,4 and 2,7 ms depending on the operating pressure. The maximum flow rate of the valve is about 9 l/min with a pressure difference of25 MPa. The designed valve meets most of the requirements placed for it. It proves that pilot operation can enable further miniaturization of hydraulic on/off valves used in digital hydraulic applications.Tämä diplomityö kuvaa pienikokoisen hydraulisen on/off venttiilin suunnittelun, rakentamisen ja testaamisen. Venttiilissä on solenoidikäyttöinen esiohjausventtiili ja se on suunniteltu käytettäväksi digitaalisen venttiilipaketin (Digital Flow Control Unit, DFCU) osana. Työssä esitellään ensin pienikokoisen solenoiditoimilaitteen suunnittelu käyttäen analyyttisia kaavoja sekä elementtimenetelmää. Toimilaitteesta rakennetaan prototyyppi ja se testataan. Suunniteltua solenoidia käytetään hydrauliventtiilin esiohjausventtiilin toimilaitteena. Hydrauliventtiilin suunnitteluprosessi ja venttiilin simuloinnit esitellään työssä. Työssä myös rakennetaan ja testataan neljä venttiiliä sisältävä venttiilipaketti. Venttiilipaketti koostuu neljästä levymäisestä osasta, jotka yhdessä muodostavat toimilaitteiden magneettipiirit sekä venttiilien virtauskanavien osat. Yksittäisen suunnitellun miniatyyriventtiilin tilavuus venttiilipaketissa on noin 4,5 cm3. Suunniteltu venttiili toimii vielä yli 25 MPa paine-erolla. Sen avautumisvasteaika on 1,3 - 1,6 ms ja sulkeutumisvasteaika 1,4 - 2,7 ms. Venttiilin maksimivirtaukseksi mitattiin noin 9 l/min 25 MPa paine-erolla. Suunniteltu venttiili täytti suurimman osan sille asetetuista suunnittelukriteereistä. Voidaan todeta, että esiohjaus mahdollistaa digitaaliventtiilien pienentämisen entisestään virtauskapasiteetin säilyessä hyvänä