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Institute Portfolio Innovation in Fluid Power Mobile & Stationary Systems

Digitalization & Automation

Fluid Power Components

Tribology & Fluids

Simulation Development & Validation

English Brochure also available online! Deutsche Broschüre online verfügbar! www.ifas.rwth-.de/brochure_en www.ifas.rwth-aachen.de/brochure_de

Contents

·· Welcome

·· Our Aims

·· History of the Institute

·· About Us

·· Research Facilities

·· Mobile & Stationary Systems

·· Digitalization & Automation

·· Fluid Power Components

·· Tribology & Fluids

·· Simulation Development & Validation

·· Former Academic Staff

·· Recent Literature

·· Contact

Contents | 03 Welcome

Research, Development and Education – these are the pillars upon which our innovative institution is built. We invite all companies, partners, associations, and students to challenge us with current issues to further develop and advance our specialization: the field of Fluid Power Systems.

We believe that only excellent education and continuous training enable the enhancement and development of fluid power systems and technology. This path will also empower a professionally satisfying career. As an academic institution, we encourage and build upon the active participation of interested domestic and international students. Exciting research projects and challenging scientific activities offer many possibilities for personal and academic growth. The resulting synergy of promoting the institute’s goals and offering outstanding qualifications for aspiring high potentials continuously leads to new impulses and innovations.

This brochure gives an insight into the organisational structure of IFAS and its fields of research. Moreover, its aim is to inspire ideas for new cooperations and projects. We are always keen to find new partners to further widen our horizon and to expand the original field of fluid power systems.e W offer tailored solutions to short and long term in- dustrial projects and public research opportunities to accommodate cutting edge industrial and academic demands. We are looking forward to discuss any possibilities for national, international and/or interdisciplinary cooperations with you.

Prof. Hubertus Murrenhoff took over the management of IFAS in October 1994. At the 11th IFK in March 2018 the directorship was handed over to his successor, Prof. Katharina Schmitz.

Prof. Katharina Schmitz graduated in mechanical engineering at RWTH Aachen University in 2010. During her studies she gained valuable technical and intercultural competencies while studying at Carnegie Mellon University in Pittsburgh (USA) and subsequently working in Le Havre (France). After graduation, she started working as a scientific staff member at IFAS and, due to her expertise and leadership skills, was appointed to Deputy Chief Engineer of IFAS in 2012. In 2015, Prof. Schmitz gradu- ated as Dr.-Ing. and moved to Southern to begin working in the industrial sector for a family-owned company, which focuses on special purpose hydraulic solutions. There, after gaining an extensive insight and experience in the design and manufacturing of large special purpose hydraulic cylinders and systems as project engineer, she was promoted to Technical Director in 2016. Her role included respon- sibility for the design, development and manufacturing of special purpose hydraulic components. Prof. Hubertus Murrenhoff graduated in mechanical engineering at RWTH Aachen University in 1978 and subsequently started working as a scientific staff member at IFAS which was then called IHP. Having obtained his doctorate, he was appointed to a leading position as Chief Engineer of IHP in 1983. During his subsequent employ- ment in the industrial sector, beginning 1986, he gathered a wide range of experience in the field of servo-hydraulics and electromechanical components and systems. A well founded fluid power expertise was achieved in his position as Vice President Engineering and Marketing of an aviation technology company in western NY, USA, during his four year stay, and subsequently in the position of Managing Director Tech- nology of a world leading company for electro-mechanical devices in Bavaria.

04 | Welcome Our Aims

... are to initiate continuous advances in the field of fluid power through innovative research and development, scientific progress and excellent (engineering) education. Therefore, the essential scientific expertise is continuously improved through our highly motivated PhD candidates by conducting theoretical, experimental and simulative projects. Thus, their professional qualification is enabled and excellent opportunities to complete their degrees result.

Our Aims | 05 History of the Institute

1968 1994 ·· Establishment of the Institute for ·· Retirement of Prof. Backé Hydraulic and Pneumatic Drives as Director of IHP and Controls (IHP) in the rooms ·· Name change into Institute for of the Institute for Agricultura Fluid Power Drives and Controls Technology in Eilfschornsteistr. (IFAS) ·· Appointment of Prof. Backé ·· Appointment of Prof. Murrenhoff as Director of IHP as Director of IFAS

1974 2005 Establishment of the Aachen Fluid Successful completion of the Power Conference (AFK) Collaborative Research Center 368 “Autonomous Production Cells” (1994 – 2005)

1972 1998 Relocation to 1977 Establishment of the International Kopernikusstr. Relocation of the institute and Fluid Power Conference (IFK) with opening of laboratory 1 in the the two-year alternating venue development area Seffent-Melaten, Aachen – Steinbachstraße

1978 2009 ·· Colloquium to honor the 80th birthday of Prof. Backé ·· Successful completion of the Collaborative Research Center 442: “Environmentally Friendly Tribosystems” (1997 – 2009)

2011 2018 Establishment of 1 MW wind ·· 50 years of fluid power at RWTH energy transmission test rig Aachen University ·· Retirement of Prof. Murrenhoff as Director of IFAS ·· Name change into Institute for Fluid Power Drives and Systems (IFAS) and implementation of new corporate design ·· Appointment of Prof. Schmitz as Director of IFAS

2014 2016 Establishment of 1.2 MW (peak ·· Damage of lab 1 due to fire at power) wave energy test rig neighboring institute – lab 1 remains unusable until major maintenance work is completed ·· Prof. Wolfgang Backé passes away at age 86

2013 2017 Raising of DFG-Koselleck grant on Relocation of the institute’s office instationary friction and leakage spaces into the Production Cluster behavior of translatory hydraulic on Campus-Boulevard seals together with the Peter Grünberg Institute (PGI), FZ Jülich 2010 2015 Start of operation of the new cen- Successful completion of STEAM tral pressure supply for laboratory 1 system implementation and (450 kW installed power) validation on 18 t excavator About Us

The Institute for Fluid Power Drives and Systems (IFAS) of RWTH Aachen University is one of the world’s largest and best known scientific institutions 11% conducting research in all aspects of fluid power. This includes hydraulics Industrial and pneumatics, as well as all of its fields of application. To be equipped for Service the future, current research includes areas such as information technology, servo-control engineering, electrical engineering, tribology and chemistry on top of mechanical engineering. 12% Public R&D Environmental, safety and health regulations as well as increasing industrial consumer requirements necessitate a continuous development of sustain- 14% able and efficient fluid power technology. Greater environmental awareness Industrial R&D and new technologies, e.g., mechatronic systems, preventative mainte- nance, additive manufacturing, biomedical applications, surface coating techniques and modern information technologies, offer new perspectives 28% and fields of application for fluid power systems. Public R&D w. industry

The highly motivated team of aspiring young scientists takes on the challenges presented by this extensive and diversified field of study. The institute’s multiple and profound national and international connections with 34% manufacturers and users of fluid power components and systems, as well Government funds as other research facilities, ensure that its activities are leading the way into the future of research, development and education of fluid power systems. Turnover 2017: 3.1 Mio. Euro

IFK Industrial Colloquium Knowledge Transfer

The International Fluid Power The industrial colloquium takes IFAS academic staff members pub- Conference (IFK) addresses users, place several times throughout the lish in technical journals and attend manufacturers and scientists in the year and provides companies in the conferences all over the world, field of fluid power engineering. The field of fluid power with an oppor- thereby presenting current research IFK is one of the largest conferences tunity to report on interesting new activities and findings in fluid power of its kind and is organised by the developments and trends inside the and related subjects. They also Society of Advancement for Fluid market. It is open to the public and introduce the latest developments Power Technology Inc. in cooper- offers fluid power manufacturers as into practical industrial applications ation with the Fluid Power Asso- well as users a platform for network- by means of cooperative projects. ciation of the German Engineering ing and technical discussions. Federation (VDMA) and IFAS.

08 | About Us Research Facilities

Experimental Laboratories

·· Over 1250 m² of laboratory space for testing ·· Anechoic room on isolated foundation, 6.5 × 8 m ·· 6 machine beds with isolated foundations ·· Sound pressure, power and intensity ·· 5 isolated test chambers with machine beds and ·· Dynamic pressure pulsation hydraulic power supplies ·· Vibration ·· 3x 1 MW electrical power supply ·· Pass-through climatic test chamber, 4 × 4.8 × 3 m,

·· Compressed air systems at 6 and 16 barrel up to -70 °C to +70 °C, 15% to 95% rel. humidity 2800 Nm³/h ·· Oil laboratory for fluid property measurements ·· Over 50 tailored scientific, component, prototype and ·· Surface measurement laboratory, including system test rigs ·· 3D-confocal microscope ·· Friction force test stands for rotational and trans- ·· 3D-contact stylus instrument latory motion ·· Cylindricity and Microhardness measuring ·· Valve test rig (up to NS25 / 840 l/min) instruments ·· Accelerated ageing test rig for hydraulic valves ·· Mechanical and electronic workshop ·· 1 MW wind energy transmission test rig ·· 1.2 MW wave energy test rig

Lectures & Courses Office Wing

·· Fundamentals of fluid power (D & E) ·· Modern office space for up to 30 researchers ·· Servo-hydraulics (D) ·· 5 rooms for meetings, seminars and students ·· Simulation of fluid power systems (D) ·· High-performance servers for simulation ·· Lubricants and pressure media (D) ·· Academic library containing fluid power journals, ·· Design of fluid power components (D) reports, conference proceedings and reference ·· Fluid power for mobile applications (D) books (approx. 5000 references)

Experimental laboratory 1

Research Facilities | 09 Mobile & Stationary Systems

Group Presentation

The application areas for hydraulic systems are replaced by electronic controls. The availability of smart extensive and range from industrial, stationary use to the components results in new alternative, robust and implementation in mobile machinery. Within this broad energy-efficient system concepts, which are already spectrum, the research group “Mobile & Stationary apparent today through the increased use of electro- Systems” focuses on the systematic, tailored redesign hydraulic direct drives. or new development of hydraulic systems and architec- tures in an increasingly mechatronic environment. Innovative drives have to be developed in order to meet the ever-increasing demands in terms of availability, The extension of these fluid-mechatronic drive productivity and energy efficiency. The holistic view of structures by modern information technology as part the system from the primary energy source to the output of the IIoT is continuously increasing the scope for creates fundamentally new drive concepts. However, research and development projects. In this context the need for research is not limited to the novel inter- the research for stationary systems concentrates on connection of hydraulic and electrical components but enhancing the systems’ durability, efficiency and service also includes the development of higher-level system intervals as well as enabling preventative maintenance. controls. In order for condition monitoring and preventative maintenance to be usefully implemented, new system Publications & Link requirements in terms of digital modeling, simplification and standardized structures arise, presenting new challenges to the group.

The wider use of real-time control hardware results in hydraulic-mechanical controllers being progressively www.ifas.rwth-aachen.de/group/sys

10 | Mobile & Stationary Systems Research Scope & Current Projects

Hybridization of Mobile Machinery Drivetrains for Renewable Energy The aim of this research approach is to optimize the Drive train are being developed for various forms of load on the diesel engine, which will remain a central renewable energies, including solutions for wind, wave component of construction machinery today and in the and flying wind turbines. The design goals for drivetrains near future. By recovering energy from the machine’s are high degrees of energy generation ranging from drives, the power requirement on the diesel engine can partial to full load, compact design, low life cycle costs be optimized. All in all, fuel consumption and emissions and successful competition against electro-mechanical (noise and particles) can be reduced in this way. drive solutions.

Carbon Footprint of Actuators for Industrial Machine and Process Controls Automation Systems Due to the increasing digitalization and the high avail- The reduction of greenhouse gas (GHG) emissions ability of cross-machine and cross-process data, new necessitates the knowledge of the significant influence system concepts are developed in close cooperation factors in automation systems. In cooperation with FIR with the group Digitalization & Automation. These in turn of RWTH Aachen University, an online based user tool lead to great potential for shortening production and for the estimation of GHG-emissions throughout the life cycle times, improving human-machine interaction and cycle of pneumatic, hydraulic and electromechanical process stability. drives in accordance to technical guidelines is developed.

Mobile & Stationary Systems | 11 Digitalization & Automation

Group Presentation

The research group “Digitalization & Automation” linked in a global network. These distributed systems attempts to close the gap between existing high-tech create new functionalities, enabling the development of fluid power components as well as systems and modern new business areas that are tailored to the customers’ information technology. The greatest challenge lies in individual needs. This requirement presupposes that the implementation of digital concepts that increase the basic functional patterns and design guidelines are added value and efficiency of the overall system whilst reconsidered. Fluid power systems must not only be maintaining the well-established fluid power robustness. adaptable but also self-describing and functionally reli- able using the concepts of feature definitions and asset The fourth industrial revolution is actually a continuing administration shells. Finally, by utilizing dynamic and evolution, whose main feature is the global connection theoretically infinite amounts of computing power, e.g., of intelligent components and systems. This endeavor cloud or high performance computing, advanced control holds tremendous potential and provides new research algorithms and data analysis techniques can lead to questions that need to be answered in order to be unforeseen functionalities. consistently implemented. The development is not only to be seen in individual sectors, but spreads across the entire industry and crosslinks various components, systems and technologies. Publications & Link

While in the past the focus was set on solutions for condition monitoring and predictive maintenance, the principle of holistic digitalization in fluid power technol- ogy and research needs to be expanded. This includes the development of cyber-physical systems that are www.ifas.rwth-aachen.de/group/dig

12 | Digitalization & Automation Research Scope & Current Projects

Comparison of Edge- and Cloud-based Systems Investigation of the Digitalization Potential for Control Designs of Fluid Power Actuators towards Fluid Power Systems Digitalization offers the opportunity to shift the process- The digitalization potential is examined in a study by ing power towards decentralized computing servers, analyzing the use case of a system’s initial operation. such as cloud services. When referring to fluid pow- Here, the process is routed along the examples of a er devices, it is still a vague assumption that cloud hydraulic compact drive and a pneumatic automation computing increases the functional scope or efficiency. system in order to outline research and development Current research approaches try to clarify the benefit of guidelines for the fluid power industry. The study is cloud services in comparison to the edge-computation funded by a consortium of industrial companies at with special focus on functional enhancements, latency a pre-competitive stage under administration of the and data security. VDMA.

Lifetime Estimation by Holistic Data Evaluation Self-Learning Algorithms for Model Identification Even though hydraulics are formally known as robust Parameter identification is a state of the art process in technology, complex machine architectures tend to have case of an existent system model. Unfortunately, a severe failures during their life time. Since there are huge sufficiently precise model is not available for most fluid machineries whose malfunctions have intense economic power applications. Therefore, in order to derive a impact, the early estimation of such events is system model autonomously advanced algorithms are mandatory. Thus, within this research project the used to map existent sensor and actor signals. The remaining lifetime of a construction vehicle is analyzed algorithms are tested on a pneumatic automation test by statistical evaluation of several sensors. bench within this research project.

Digitalization & Automation | 13 Fluid Power Components

Group Presentation

The research and development of diverse fluid power specific use cases, as well as the development of cor- components is focus of the research group rective measures in case of damage. The methodology “Fluid Power Components”. From concept to prototype includes the application of analytical, experimental and and functional testing, customized holistic approaches numerical methods. By the use of these approaches, are offered to successfully conduct or accompany optimized and novel components can be developed. different kinds of component related studies. Besides cost-effectiveness, modern fluid power drives In addition to the further development of existing are required to offer high efficiency and functionality, low conventional components, the implementation of smart noise, long service life and high robustness. Further- units with embedded sensors is driven forward. The more, environmental issues such as biodegradable range of research projects reaches from specialized supplies and the use of recyclable and non-toxic components for aerospace and automotive applications, materials are increasingly gaining importance. Basing on through construction, agricultural and forestry these requirements, further development of machinery, to stationary equipment, such as manu- components is advanced, constituting an important facturing machinery or renewable energy plants. step in future-proofing fluid power drives and systems. Investigations are undertaken in the framework of basic research, pre-competitive research, joint research and Publications & Link industrial projects.

The group considers upcoming challenges in component research and development from all relevant perspectives. This includes the analysis of customary components and the adaptation or optimization for www.ifas.rwth-aachen.de/group/com

14 | Fluid Power Components Research Scope & Current Projects

Ceramic Flat Spool Valve Acoustic Emission of Pneumatic Components Cylindrical spool valves made of steel have two ma- The excitation of pneumatic systems causes structure- jor disadvantages. The non-adjustable annular gap borne noise and airborne noise, which is perceived between spool and bushing leads to dissipation through by people as unpleasant and affects the hearing. By leakage and the wear of the control edges leads to a means of a specially developed measuring method and change of the operating behavior. In cooperation with a holistic simulation model, the primary sound sources the IWM of RWTH Aachen University, a flat slide valve are identified. This enables the incorporation of acous- made of ceramic is being developed which avoids the tical optimization into the early development process of mentioned weak points. products.

Decentralized Hydraulic Axis with High-Speed Investigation of Cylinder Block – Valve Plate Components Contact in Axial Piston Machines An electro hydraulic actuator (EHA) with a high speed A combination of experimental and theoretical power unit for demanding requirements of mobile approaches is used on the basis of a self-developed applications for compactness and power density is simulation program to obtain information on the being developed in cooperation with the MSE of RWTH tribological contact. Gap heights in the range of a few Aachen University. Therefore a new high speed internal micrometers and contact friction are measured gear pump is designed in order to achieve a speed level realistically on a fully functional 160 kW pump and increase and thus an increase in power density of the modeled numerically. hydraulic system.

Fluid Power Components | 15 Tribology & Fluids

Group Presentation

The “Tribology & Fluids” research group focuses on the (up to 8000 bar), friction forces in sealing systems at research of pressure fluids and the holistic understand- relative speeds of up to 10 m/s, leakage and entrain- ing of tribological systems in hydraulic and pneumatic ment rate of sealing systems have been designed applications. and are in operation. Furthermore, a variety of tribo- meters for the investigation of abstracted contacts Investigations of the various tribological and pressure under the influence of various lubrication conditions fluid issues are carried out on different levels of abstrac- and material pairings are in operation. Additionally, an tion ranging from tribometer investigations to complex oil laboratory enabling standardized tests, e.g., capillary multi-body systems. The aim is to be able to ensure the viscosimetry, HFRR and SLBOCLE, is available. transferability of the findings to real systems, enabling an application-oriented optimization of existing tribo- The research results intend to improve the physical logical systems. In parallel to experimental investiga- and / or empirical understanding of the tribological tions, analytical and simulative models and methods for contacts and systems, thus enabling modelling for an describing the observed effects are created, extended efficient and durable component and fluid design, as and validated whenever possible. By use of these well as for lifetime prediction. methods local critical states in tribological systems can already be evaluated and optimized during the design Publications & Link process.

IFAS has extensive experience and expertise in the development and operation of highly specialized tailor made test benches. Amongst others, unique test rigs for the determination of pressure-dependent fluid properties www.ifas.rwth-aachen.de/group/tri

16 | Tribology & Fluids Research Scope & Current Projects

BioHydra Electrostatic Charging of Fluids and Components Novel and sustainable water/polymer based hydraulic Ash- and zinc-free hydraulic fluids with a very low fluids are developed within the BioHydra project, which conductivity are increasingly employed in hydraulic is conducted with industrial partners and the Fraunhofer applications. As a result, electrostatic charges are no research organization. At IFAS, extensive wear tests are longer conductively dissipated in the liquid and spon- carried out to gain insight into the operational capability taneous discharges occur, especially in the filter. At IFAS of the fluid in real hydraulic systems. the influences on the charges are examined.

Metallic Sealing Tailor Made Fuels from Biomass (TMFB) The leakage free sealing using poppet valves has a As part of the cluster of excellence “Tailor Made Fuels significant importance in hydraulics, especially in regard from Biomass” diesel fuels based on biomass are to fail safe and counter-balance valves. Nevertheless, developed. A central research question in this context is the sealing mechanism has not been fully explored and the injectability of these fuels in the combustion is thus investigated within this public research project. chamber. The currently unknown fluid properties under For this purpose, coupled structure-fluid simulations the pressure conditions in the rail represent a crucial including complex contact models over a very broad aspect for this issue. To gain further insight, high-pres- scale range are carried out and validated by means of sure test rigs are developed and operated at IFAS. experiments in cooperation with the Peter-Grünberg- Institute of FZ Jülich.

Tribology & Fluids | 17 Simulation Development & Validation

Group Presentation

In the context of the industrial internet of things and pre- well-equipped test field allow us to efficiently set-up ventative maintenance the need for accurate and novel and validate simulations for complex systems as well as simulation models is constantly increasing. Therefore, specific detached physical phenomena. advancing simulation methods and their experimental validation are the focus of the “Simulation Development Although fluid power machines and phenomena have & Validation” research group. been developed and researched for many decades, the holistic simulation including every detail or physical Independent of the component or system, it is crucial property is not yet possible. The current research scope to begin with the underlying physics before starting to includes, e.g., gap heights in displacement machines, build or develop a model in a computational environ- cavitation, sealing mechanisms, rubber sealing fatigue ment. Nevertheless, in some instances empirical data or gas injection systems. The accurate research and for model abstraction is inevitable. In either case, the simulation of fluid power phenomena, components and numerical model necessitates validation using experi- systems will be essential to reach the goals of IIoT in mental set-ups. The choice of the experimental set-up hydraulics and pneumatics. plays a fundamental role in terms of a time and resource efficient model development process. When- ever possible, simulation results at IFAS are validated Publications & Link with experimental data.

Wherever state of the art tools reach their limits, new or enhanced simulation tools and methods can be researched and developed. Our experience with multi- fold projects, various simulation environments and a www.ifas.rwth-aachen.de/group/sim

18 | Simulation Development & Validation Research Scope & Current Projects

CNG Injection System Water Radial Piston Pump Compressed natural gas (CNG) is a promising alter- Sufficient lubrication of tribological contacts within native for conventional liquid fuels due to several pumps and motors is always a crucial aspect and advantages. The improvement of a CNG driven engine especially demanding when substituting hydraulic oil requires a direct injection system. A time efficient by water as pressure fluid. A prototype and simulation simulation of the system is imperative for a successful model of a high pressure radial piston pump for water engine design. In cooperation with an industrial partner applications is developed within a governmentally such a simulation model is being developed. founded project.

Dissolved Air in Hydraulic Systems Dynamic Sealing Simulation Gas cavitation has always been a major problem in The description of friction between two rough surfaces hydraulic systems leading to cavitation erosion which is difficult to calculate especially if the material is ultimately results in component failure. Its prediction deformable rubber. Although rubber seals appear in requires accurate physical knowledge of the mech- every technical application, their physical treatment anisms behind the air dissolution process as well as is not fully understood yet. In conjunction with the fluid specific characteristics, e.g., diffusion coefficient development of a new physical model at the FZ Jülich and solubility. These issues are the research focus of a a dynamic sealing simulation model is built up within a DFG-funded project in conjunction with a model devel- governmentally founded project. opment to predict air bubble growth.

Simulation Development & Validation | 19 Former Academic Staff

Directors Backé W., em. Univ.-Prof. Dr.-Ing. Dr. h.c. mult., Aachen (†) Murrenhoff H., Univ.-Prof. Dr.-Ing. i. R., Aachen Chief Engineers Lück J., Dr.-Ing. i.R., Wetter 1977 Klinger F., Prof. Dr.-Ing., Innowind Forschungs- Heinen R., Dr.-Ing. i.R., Drolshagen gesellschaft, Saarbrücken * Riedel H., Prof. Dr.-Ing. i.R., Köln 1978 Lee K. L., Prof. Dr.-Ing. i.R., Seoul, Korea Helduser S., Prof. Dr.-Ing. i.R., Wobben D., Dr.-Ing. i.R., F., Dr.-Ing. (†) 1979 Christiani P., Dr.-Ing. i.R., Neuffen Murrenhoff H., Univ.-Prof. Dr.-Ing. i.R., Aachen Eich O., Dr.-Ing. i.R., Saffe P., Dr.-Ing., Aventics, Laatzen Mihalcea R., Prof. Dr.-Ing. i.R., Illinois, USA Haas H.-J., Dr.-Ing., Parker Hannifin, Schulz R., Prof. Dr.-Ing., Thomas Magnete, Jacobs G., Univ.-Prof. Dr.-Ing., RWTH Aachen Herdorf University, Aachen Sprockhoff V., Dr.-Ing. i.R., Lehner S., Dr.-Ing., Linde Hydraulics, 1980 Goedecke W.-D., Prof. Dr.-Ing. i.R., St. Aschaffenburg Georgen Fischer M., Dr.-Ing., ARGO-HYTOS, Klie J., Dr.-Ing. i.R., Sprockhövel * Kraichtal-Menzingen Kleinbreuer W., Dr.-Ing. i.R., St. Augustin Bauer F., Dr.-Ing., Hydac System, Renvert P., Prof. Dr.-Ing. i.R., Neuenrade Sulzbach/Saar Trudzinski R. M., Dr.-Ing., TU / Meuser M., Dr.-Ing., MAN Diesel & Turbo, Harburg, Hamburg Willebrand H., Dr.-Ing., BSI, Königswinter Prust D., Dr.-Ing., XCMG European Research 1981 Hoffmann W., Dr.-Ing. i.R., Center, Krefeld Luhmer H., Dr.-Ing., i.R., Kaarst Reinertz O., Dr.-Ing., IFAS der RWTH Aachen Neuhaus R., Dr.-Ing., i.R., Marktheidenfeld University, Aachen Lu Y. H., Prof. Dr.-Ing., i.R., Beijing, 1982 Tumbrink M., Dr.-Ing. i.R., /Baden Weiler W., Prof. Dr.-Ing., i.R., Landshut 1973 Brodowski W., Dr.-Ing. (†) 1983 Berger J., Dr.-Ing., FillDesign, Jülich Hamburger N., Dr.-Ing. i.R., Paris Denker K., Dr.-Ing., Festo, Esslingen Hömberg K., Dr.-Ing. i.R., Niederstadt J., Dr.-Ing., Bosch Rexroth, 1974 Bialas V., Dr.-Ing. i.R., Hilden Gronau Hahmann W., Dr.-Ing. i.R., Kempen Overdiek G., Dr.-Ing., ixetic Bad Homburg, Bad 1975 Böckmann R.-D., Prof. Dr.-Ing. i.R.,Wettenberg Homburg v. d. H. Causemann P., Dr.-Ing., ZF Sachs, Roth J., Dr.-Ing., i.R., Gifhorn Schwenzer R., Dr.-Ing., i.R., Esslingen Lipphardt P., Dr.-Ing. i.R., Holzwickede Theissen H., Dr.-Ing., i.R., Mönchengladbach Tatar H., Dr.-Ing. i.R., Wernecke P. W., Dr.-Ing. (†) 1976 Dreymüller J., Dr.-Ing., Workflow Consult 1984 Haarhaus M., Dr.-Ing., i.R., Tönisvorst Dr.-Ing. Jürgen Dreymüller, Shih M.-Ch., Prof. Dr.-Ing., i.R., Tainan, Taiwan

20 | Former Academic Staff Zimmermann H. L., Dr.-Ing. i.R., Krefeld Gimkiewicz K., Dr.-Ing., Volkswagen, 1985 Sänger J., Dr.-Ing., Ingenieur-Büro, * 1986 Hong Y.-S., Prof. Dr.-Ing., Hankuk Aerospace Leufgen M., Dr.-Ing., Königswinter University, Seoul, Korea Tao J., Dr.-Ing., Merkel Freudenberg Fluid- Langen H. J., Dr.-Ing. i.R., Frechen technic, Hamburg Langen A., Dr.-Ing., Linde Hydraulics, Tsung T. T., Dr.-Ing., National Taipei University, Aschaffenburg Taipei, Taiwan Pachnicke E., Dr.-Ing. (†) 1992 Lue Y., Dr.-Ing., Liebherr, Shanghai, China Trost J., Dr.-Ing., Büttner Gesellschaft für Rinck S., Dr.-Ing., Singulus Technologies, Trocknungs und Umwelttechnik, Krefeld- Kahl a. M. Uerdingen Rotthäuser S., Dr.-Ing., Ingenieurgemeinschaft 1987 Forster I., Prof. Dr.-Ing., TH Südwestfalen, IgH, Ulrich H., Prof. Dr.-Ing., Hochschule Ioannidis I., Dr.-Ing., Oskar Frech, Schorndorf West, Mühlheim a. d. Ruhr Kolvenbach H., Dr.-Ing., Linator, Aachen Welschof B., Dr.-Ing., Tadano Faun, Nguyen Tri, Prof. Dr.-Ing., Jade Hochschule, Lauf a. d. Pegnitz Wilhelmshaven 1993 Klein A., Dr.-Ing., Akebono Europe, Winner D., Dr.-Ing., TAW Cert, Fürth Gonesse, Frankreich Zehner F., Prof. Dr.-Ing., FH , Lodewyks J., Prof. Dr.-Ing., Hochschule Gelsenkirchen Luzern, Horw, Schweiz 1988 Berbuer J., Dr.-Ing., Entwicklungsbüro für fluid- Nied-Menninger T. T., Prof. Dr.-Ing., technische Systeme und Komponenten, FH Bochum, Bochum Aachen Renn J. C., Prof. Dr., National Yunlin University Dluzik K., Dr.-Ing., Geräte und Pumpenbau, of Science, Douliu, Taiwan Merbelsrod Schillings K., Dr.-Ing., Linde Material Handling, Hellmann K.-H., Dr.-Ing., Unternehmens- Aschaffenburg beratung, Schriesheim Zähe B., Dr.-Ing., SUN-Hydraulics, Rupprecht K.-R., Dr.-Ing., Frankfurt University of Applied Sciences, Frankfurt 1994 Busch C., Prof. Dr.-Ing., FH Zwickau, 1989 Lawrence M. D., Dr.-Ing., Portugal Weilerbach 1990 Anders P., Prof. Dr.-Ing., FH Furtwangen, Dahmann P., Prof. Dr.-Ing., FH Aachen, Emmingen Aachen Mauer J., Dr.-Ing., Blum-Novotest, Willich Faßbender A., Prof. Dr.-Ing., FH Köln, Köln Ohligschläger O., Dr.-Ing., Thomas Magnete, Geimer M., Prof. Dr.-Ing., KIT, Herdorf Piechnick M., Dr.-Ing., marpitec, Ortwig H., Prof. Dr.-Ing., FH Trier, Trier Aschaffenburg * Scholz D., Prof. Dr.-Ing., FH Münster, Schneider E., Dr.-Ing., Robert Bosch, Schwarz T., Dr.-Ing., Allianz Global Corporate & Echterdingen, Leinfelden Speciality, München Wennmacher G., Prof. Dr.-Ing., DHBW Duale Zumbrägel J., Dr.-Ing., Robert Bosch, Hochschule Baden-Württemberg, Lörrach 1991 Bergemann M., Dr.-Ing., Siemens Landis 1995 Boes Ch., Dr.-Ing., Moog, Böblingen & Staefa Production, Rastatt Chen M.-F., Prof. Dr.-Ing., National Changhua Besgen J., Dr.-Ing., Metallbau Pfeuffer, University of Education,Taiwan Werneck Eschmann R., Dr.-Ing., Festo, Esslingen Feigel H.-J., Dr.-Ing., Mando Halla Company, Esser J., Dr.-Ing., Porsche, Weissach Seoul, Korea Kögl Ch., Dr.-Ing., Siemens,

Former Academic Staff | 21 Mostert E., Dr.-Ing., Schumag, Aachen Völker B., Dr.-Ing., MSA, Karlstadt a. M. Weishaupt E., Dr.-Ing., Hydac System, 2000 Czinki A., Prof. Dr.-Ing., Hochschule Sulzbach/Saar Aschaffenburg, Aschaffenburg Breuer-Stercken A., Prof. Dr.-Ing., Hochschule Linden D., Dr.-Ing., Weber-Hydraulik Valve OstwestfalenLippe, Tech, 1996 Herakovic N., Dr.-Ing., University of Ljubljana, Werner M., Dr.-Ing., BWG Bergwerk- u. Ljubljana, Slowenien Walzwerkmaschinenbau, Jarchow M., Dr.-Ing., Dyna-Mess Prüfsysteme, Zhang Y., Dr.-Ing., Bosch Rexroth, Lohr a. M. /Rhld. 2001 Fees G., Dr.-Ing., Wessel-Hydraulik, Kett R., Dipl.-Ing., Fluidon, Aachen Wilhelmshaven Kraft W., Dr.-Ing., Linde Hydraulics, Müller B., Dr.-Ing., Weber Hydraulik, Aschaffenburg * Güglingen Latour C., Prof. Dr.-Ing., Hochschule für Mundry S., Dr.-Ing., Caterpillar Global Mining angewandte Wissenschaften Würzburg- Europe, Lünen Schweinfurt, Schweinfurt Oberem R., Dr.-Ing. (†) Pott H. N., Dr.-Ing., Voss Fluidtechnik, Baum H., Dr.-Ing., Fluidon, Aachen Wipperfürth 2002 Günther G., Dr.-Ing. (†) Wolff-Jesse C., Dr.-Ing., Deutsche Bahn, van Bebber D., Dr.-Ing., Ford Forschungs- Frankfurt a. M. zentrum, Aachen 1997 Donders S., Dr.-Ing., Ingeniös, Haigerloch 2003 Breuer D., Dr.-Ing., Bosch Rexroth, Horb Jang D. S., Dr.-Ing., Doosan Infracore, Bublitz R., Dr.-Ing., Parker Hannifin, Kaarst Gyeonngi-Do, Korea Hantke P., Dr.-Ing., Bosch Rexroth, Lohr a. M. Kleist A., Dr.-Ing., Linde Hydraulics, Schmidt M., Dr.-Ing., Liebherr-Components, Aschaffenburg Baldy M., Dr.-Ing., Polysius, Beckum 2004 Boldt T., Dr.-Ing., Weber Hydraulik, Güglingen 1998 Chiang M.-H., Prof. Dr.-Ing., National Taiwan Breit H., Dr.-Ing., Dr. Breit GmbH, Heiligenhaus University of Science & Technology, Taipei Jansen R., Dr.-Ing., Aker Solutions, Erkelenz Hagemeister W., Dr.-Ing., Ingenieur- Meindorf T., Dr.-Ing., Fluitronics, Krefeld gemeinschaft IgH, Essen Zhang X., Dr.-Ing., Quaker Chemical, Jongebloed H., Dr.-Ing., Wessel-Hydraulik, Shanghai, China Wilhelmshaven 2005 Schuster G., Dr.-Ing., Robert Bosch, Kempermann Ch., Dr.-Ing., Fluitronics, Krefeld Deeken M., Dipl.-Ing., Liebherr-MCCtec, Mager M., Dr.-Ing., Parker Hannifin, Kaarst Roosen K., Dr.-Ing., Parker Hannifin, Kaarst Hoppermann A., Prof. Dr.-Ing., Hochschule Tappe P., Dr.-Ing., Magnet-Schultz, Niederrhein, Krefeld Goerres M., Dipl.-Ing., Merkel Freudenberg Gessat J., Prof. Dr.-Ing., HTW Saarland, Fluidtechnic, Schwalmstadt 1999 Saarbrücken Schütz B., Dr.-Ing., Robert Bosch, Stuttgart * Nevoigt A., Prof. Dr.-Ing., FH Südwestfalen, 2006 Gauchel W., Dr.-Ing., Festo, Esslingen Iserlohn Schultz A., Dr.-Ing., Magnet-Schultz, Remmelmann A., Dr.-Ing., John Deere, Memmingen Zaun M., Dr.-Ing., gwk Gesellschaft Wärme Ristic M., Dr.-Ing., Bosch Rexroth, Lohr a. M. Kältetechnik, Kierspe Sanchen G., Dr.-Ing., Hilti, Schaan, Goenechea E., Dr.-Ing., Bucher Hydraulics, Liechtenstein Neuheim, Schweiz

22 | Former Academic Staff Scharf S., Dr.-Ing., Jungheinrich, Norderstedt Research Center, Krefeld 2007 Göhler C., Dr.-Ing., XCMG European Research Elvers J., Dr.-Ing., Jülich Center, Krefeld Lorenz B., Dr.-Ing., Continental, Frankfurt * 2008 Stammen C., Prof. Dr.-Ing., XCMG European 2013 Kühnlein M., Dr.-Ing., WILO, Research Center, Krefeld Schuhmacher J., Dr.-Ing., TÜV Rheinland Palmen A., Dr.-Ing., Luk, Bühl Energie und Umwelt, Köln Kohmäscher T., Dr.-Ing., Danfoss Power Heipl O., Dr.-Ing. Solutions, Neumünster 2014 Robens N., Dr.-Ing. Dipl.-Wirt.Ing., ABB, Dittmer H.-J., Dr.-Ing., Ingenieur-Büro, Hanau Sindelfingen * Gels S., Dr.-Ing. Dipl.-Kfm., Hydraulische 2009 Liermann M., Dr.-Ing., Danfoss Power Antriebstechnik P&G, Altena Solutions, Neumünster Schmitz J., Dr.-Ing. Dipl.-Wirt.Ing., Linde Schmidt M., Dr.-Ing., ABB, Hanau-Großauheim Hydraulics, Aschaffenburg 2010 Reichert M., Dr.-Ing., Hydac Engineering, Sgro S. Dr.-Ing., Montanhydraulik, Steinhausen Holzwickede Verkoyen T., Dr.-Ing., XCMG European 2015 Vatheuer N., Dr.-Ing., Hydac, Sulzbach Research Center, Krefeld Siebert C., Dipl.-Ing., XCMG European Schlemmer K., Dr.-Ing., Moog Industrial Group, Research Center, Krefeld Luxemburg von Grabe C., Dr.-Ing. Fritz S., Dr.-Ing., Varian Medical Systems Schmitz (geb. Schrank) K., Univ.-Prof. Dr.-Ing., Particle Therapy, RWTH Aachen University, Aachen Torikka T., Dr.-Ing., Bosch Rexroth, Lohr * 2016 Heitzig S., Dr.-Ing. Dipl.-Wirt.Ing., Integral Wohlers A., Dr.-Ing., Hydac Filtertechnik, Hydraulik, Willich Sulzbach/Saar Vukovic M., Dr.-Ing., Linde Hydraulics, 2011 Enekes C., Dr.-Ing., Klüber Lubrication Aschaffenburg München, München Schulze Schencking D., Dr.-Ing., Hauhinco, Leonhard L., Dipl.-Ing., Danfoss Power Sprockhövel Solutions, Neumünster 2017 Schleihs C., Dr.-Ing., IFAS der RWTH Aachen von Dombrowski R., Dr.-Ing., Siempelkamp, University, Aachen Krefeld Weinebeck A., Dipl.-Ing., GETRAG, Riedel C., Dr.-Ing. Dipl.-Wirt. Ing., GHH Untergruppenbach Santiago, Chile Longhitano M., M.Sc., OMT Torino, Turin, Piepenstock U., Dipl.-Ing., Hydraulische Italien Antriebstechnik P&G, Altena 2018 Sugimura K., M.Sc., Japan Fatemi A., Dr.-Ing., Robert Bosch, Tiffin (geb. Dießel) D., M.Sc., Bucher Stuttgart Hydraulics, Neuheim, Schweiz Kamizuru Y., Dr.-Ing., Bosch Rexroth, Wegner S., Dipl.-Ing., Stackpole International, Hamburg Aachen Ibrahim M., Dr.-Ing., Benha University, Kairo, Ägypten González R. G., Dr.-Ing., Festo, Esslingen * Nafz T., Dr.-Ing., Bosch Rexroth, Horb * 2012 Drumm S., Dr.-Ing., Wirtgen Group, Windhagen Ewald J., Dr.-Ing., Bosch Rexroth, Lohr a. M. Inderelst M., Dr.-Ing., XCMG European * external promotion

Former Academic Staff | 23 Recent Literature

Boldt, Torsten Göhler, Oliver-Carlos Kamizuru, Yukio Entwicklung mechatronischer Alterungsuntersuchungen und Me- Development of Hydrostatic Drive Systeme am Beispiel hydraulischer thoden zur Alterungsvorhersage für Trains for Wave Energy Converters, Spanntechnik, 2004 umweltverträgliche Schmierstoffe in 2014 Breuer, David neu gestalteten Tribosystemen,2008 Kim, Sunghun Reibung am Arbeitskolben von Goenechea, Eneko Measurement of effective bulk Schrägscheibenmaschinen im Mechatronische Systeme zur modulus and its use in CFD Langsamlauf, 2007 Pulsationsminderung hydrosta- simulation, 2012 Drumm, Sebastian M. tischer Verdrängereinheiten, 2007 Kohmäscher, Torsten Entwicklung von Messmethoden Gutiérrez González, Roberto Modellbildung, Analyse und Aus- hydraulischer Kraftstoffeigen- Development of a diagnostic legung hydrostatischer Antriebs- schaften unter Hochdruck, 2012 concept for pneumatic systems and strangkonzepte, 2008 Elvers, Jan components, 2012 Kühnlein, Michael Eindimensionale Modellierung Hantke, Patrick Selbstverstärkende Elektro- pneumatischer Netzwerkkom- Entwicklung eines piezobetätigten Hydraulische Bremse mit hoher ponenten, 2016 Schaltventils mit Busanbindung Systemdynamik, 2013 Enekes, Claus für den untertägigen Einsatz in der Liermann, Matthias Ausgewählte Maßnahmen zur Wasserhydraulik, 2005 Self-energizing Electro-Hydraulic Effizienzsteigerung von Axialkolben- Heipl, Oliver P. Brake, 2008 maschinen, 2012 Experimentelle und numerische Meindorf, Thomas Ewald, Julian Modellbildung zur Bestimmung der Sensoren für die Online-Zustands- Selbstverstärkende Elektro-Hydrau- Reibkraft translatorischer Dicht- überwachung von Druckmedien lische Bremse (SEHB) für Schienen- ungen, 2013 und Strategien zur Signalaus- fahrzeuge, 2011 Heitzig, Stefan wertung, 2005 Fatemimoughari, Arshia Analyse und Optimierung biokraft- Meuser, Marcell Analysis of tribological properties stoffgeschmierter Tribosysteme in Nichtlineare Regelung pneu- for the design of synthetic biofuels, Common-Rail-Pumpen, 2017 matischer Antriebe, 2011 2012 Hoppermann, Andreas Palmen, André Fritz, Stephan Einfluss von Oberflächengestaltung Untersuchungen zur Leistungs- Verfahren zur Erkennung sowie und Werkstoffwahl auf das tribo- steigerung und Bewertung der Diagnose von Fehlern in pneuma- logische Verhalten von Gleit- und Effizienz von hydrostatischen tischen Systemen und Kompo- Dichtungskontakten hydraulischer Verdrängereinheiten, 2008 nenten, 2011 Komponenten, 2006 Prust, David Gauchel, Wolfgang Ibrahim, Mohamed Entwicklung einer auf trockener Entwicklung und Regelung eines Investigation of Hydraulic Trans- Adhäsion basierenden Greifvor- integrierten und flexiblen servopneu- missions for Passenger Cars, 2011 richtung, 2011 matischen 2-Backengreifers, 2006 Inderelst, Martin Reichert, Maxim Gels, Stefan Efficiency improvements in mobile Development of high-response Einsatz konturierter und bes- hydraulic systems, 2013 piezo-servovalves for improved chichteter Kolben-Buchse-Paare Jansen, Roman J. performance of electrohydraulic in Axialkolbenmaschinen in Verschleiß und Lebensdauerab- cylinder drives, 2010 Schrägscheibenbauweise, 2011 schätzung von Dichtungen in pneu- matischen Sitzventilen, 2008

24 | Recent Literature Reinertz, Olivier Schrank, Katharina von Grabe, Christian Miniaturisierung servopneumatischer Eindimensionale Hydrauliksimulation Effizienzsteigerung durch Abluft- Rotationsantriebe, 2014 mehrphasiger Fluide, 2015 nutzung bei pneumatischen Riedel, Christian Schütz, Björn Antrieben, 2015 Massenstrombasierte hydraulische Hochdynamischer endlagenge- von Dombrowski, René Systemsimulation im Ein- und Zwei- dämpfter Hydraulikaktor, 2005 Modellierung der Partikelverteilung in phasenmodell, 2014 Schultz, Albert W. hydraulischen Systemen, 2015 Robens, Niko Simulationsgestützter Entwurf Vukovic, Milos Entwicklung und Auslegung von elektromagnetischer Linearaktoren Hydraulic Hybrid Systems for Endlagendämpfungen für hoch- für fluidtechnische Ventile, 2006 Excavators, 2017 dynamische Zylinderantriebe, 2016 Schumacher, Jan Wohlers, Alexander Roosen, Klaus Alterungs- und Verschleißverhalten Tribologische Simulationsmodell- Hydraulische Stellantriebe mit von Druckübertragungsmedien und bildung dynamischer Dichtungen, Nebenstromregelung, 2002 hydraulischen Ventilen, 2013 2012 Scharf, Stephan Schulze Schencking, Dirk B. Zaun, Michael Auslegung ZrCg-beschichteter Neuartige Radialkolbeneinheit mit Elektrorheologische Ventile als Stell- Kolben mit harter Buchse für axialen Steuerplatten, 2016 elemente in Zylinderantrieben, 2007 Axialkolbenmachinen mit umwelt- Schuster, Gerhard Zhang, Xingang verträglichen Druckübertragungs- CFD-gestützte Maßnahmen zur Alterungsmechanismen ökologisch medien, 2014 Reduktion von Strömungskraft verträglicher Druckflüssigkeiten, Schleihs, Christian und Kavitation am Beispiel eines 2004 Acoustic Design of Axial Piston hydraulischen Schaltventils, 2005 Swashplate Machines, 2017 Sgro, Sebastian Schlemmer, Kristof Concepts of Hydraulic Circuit Lecture Notes Entwicklung eines wissensbasierten Design Integrating the Combustion Unterstützungssystems zur Ausle- Engine, 2014 Fundamentals of Fluid Power gung servohydraulischer Linearan- Stammen, Christian Part 1: Hydraulics triebe, 2012 Condition Monitoring für intelligente Part 2: Pneumatics Schmidt, Martin hydraulische Linearantriebe, 2005 Grundlagen der Fluidtechnik Untersuchung und Ansätze zur Torikka, Tapio Teil 1: Hydraulik modellhaften Beschreibung der Bewertung von Analyseverfahren zur Teil 2: Pneumatik Alterung auf Estern basierender Zustandsüberwachung Servohydraulik Zwischenstoffe für den Einsatz in einer Axialkolbenpumpe, 2011 Fluidtechnik für mobile umweltverträglichen Tribo- Vatheuer, Nils Anwendungen systemen, 2003 Untersuchung des Bewegungsver- Schmidt, Matthias haltens schräggestellter Kolben in Dichtheit als Entwicklungsschwer- Schwenkscheibenmaschinen, 2016 punkt für Sitzventile hochdynamisch Verkoyen, Torsten schaltender Zylinderantriebe, 2010 Aktive Sekundärmaßnahmen zur A complete list of publications, Schmitz, Johannes B. Vermeidung von fahrzustands- lecture notes and older dissertations Konzipierung und Vermessung abhängigen Geräuschen in can be found and ordered on our hydrostatischer Windkraftgetriebe, hydraulischen Lenksystemen, 2009 hompage: 2015 www.ifas.rwth-aachen.de

Recent Literature | 25 Notes

26 | Notes Contact

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Society for the Advancement of Fluid Power Technology Inc. The aim of this society is to promote scientific research and development in the field of fluid power technology. Main tasks are technology transfer by organising conferences and exhibition stands, publication of research results and distribution of technical literature. Further tasks concern the support of aspiring academics and research, e.g., by announcing the hp-award and providing financial support for research work. Contact may be established via IFAS.

Imprint Institute Portfolio, 2018, v1.1 online, 2018-03-15

Publisher: Institute for Fluid Power Drives and Systems (IFAS) of RWTH Aachen University

Responsible: C. Schleihs, M. Rückert Editors: K. Schmitz, C. Schleihs, O. Reinertz, M. Gärtner, F. Kratschun, R. Leifeld, T. Mielke, M. Waerder Layout: C. Schleihs, N. Pavlicenko, P. Schleihs, M. Rückert Photography: M. Petry (Cover), K. Schmitz (p. 4), H. Murrenhoff (p. 4), IHP (p. 6), Volvo (p. 10), IFAS (all others) Illustration : Carabin Creatives (p. 8), C. Schleihs (p. 28), IFAS (all others)

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