[1]Achten, P., 2010. Convicted to innovation in fluid power. Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering, 224(6):619-621.

[2]Alleyne, A., Liu, R., 2000. A simplified approach to force control for electro-hydraulic systems. Control Engineering Practice, 8(12):1347-1356.

[3]Backé, W., 1993. The present and future of fluid power. Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering, 207(48):193-212.

[4]Bobrow, J.E., Lum, K., 1996. Adaptive, high bandwidth control of a hydraulic actuator. Journal of Dynamic Systems, Measurement, and Control, 118(4):714-720.

[5]Brown, F.T., 1987. Switched reactance hydraulics: a new way to control fluid power. Proceedings of National Conference on Fluid Power, Chicago, USA, p.25-34.

[6]Brown, F.T., Tentarelli, S.C., Ramachandran, S., 1988. A hydraulic rotary switched inertance servo-transformer. Journal of Dynamic Systems, Measurement, and Control, 110(2):144-150.

[7]Burrows, C.R., 1996. Fluid power systems design—Bramah’s Legacy. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 210(2):105-120.

[8]Burrows, C.R., 2000. Fluid power systems—some research issues. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 214(1):203-220.

[9]Burrows, C.R., 2004. Fluid power—some reflections. The 6th International Conference on Hydraulic Machinery and Hydrodynamics, Timisoara, Romania, p.51-56.

[10]Cao, J., Gu, L., Wang, F., et al., 2005. Switch mode hydraulic power supply theory. Proceedings of ASME International Mechanical Engineering Congress and Exposition, Orlando, Florida, USA.

[11]Chen, X.B., Gao, F., Qi, C.K., et al., 2013. Energy storing mechanism for a new hydraulic motor actuated robot. Proceedings of the ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, Portland, Oregon, USA.

[12]Devendran, R.S., Vacca, A., 2013. Optimal design of gear pumps for exhaust gas after treatment applications. Simulation Modelling Practice and Theory, 38:1-19.

[13]Eaton, M., Keogh, P.S., Edge, K.A., 2006. The modelling, prediction, and experimental evaluation of gear pump meshing pressures with particular reference to aero-engine fuel pumps. Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering, 220(5):365-379.

[14]Edge, K.A., 1997. The control of fluid power systems—responding to the challenges. Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering, 211(2):91-110.

[15]Ehsan, M., Rampen, W.H.S., Salter, S.H., 2000. Modelling of digital-displacement pump-motors and their application as hydraulic drives for nonuniform loads. ASME Journal of Dynamic Systems, Measurement, and Control, 122(1):210-215.

[16]Fales, R., 2005. Stability and performance analysis of a metering poppet valve. International Mechanical Engineering Congress and Exposition, Orlando, Florida, USA.

[17]Fales, R., 2006. Stability and performance analysis of a metering poppet valve. International Journal of Fluid Power, 7(2):11-17.

[18]Habibi, S., Goldenberg, A., 2000. Design of a new high performance electrohydraulic actuator. IEEE/ASME Transactions on Mechatronics, 5(2):158-164.

[19]Ivantysyn, J., Ivantysynova, M., 2003. Hydrostatic Pumps and Motors: Principles, Design, Performance, Modelling, Analysis, Control and Testing. Tech Books International.

[20]Ivantysynova, M., 2008. Innovations in pump design—what are future directions? Proceeding of the 7th JFPS International Symposium on Fluid Power, Toyama.

[21]Ivantysynova, M., Lasaar, R., 2004. An investigation into micro- and macrogeometric design of piston/cylinder assembly of swash plate machines. International Journal of Fluid Power, 5(1):23-36.

[22]Johnston, D.N., 2009. A switched inertance device for efficient control of pressure and flow. ASME/Bath Fluid Power Symposium: Valve Design and Analysis, Hollywood, USA, p.589-596.

[23]Johnston, D.N., Edge, K.A., Vaughan, N.D., 1991. Experimental investigation of flow and force characteristics of hydraulic poppet and disc valves. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 205(3):161-171.

[24]Khoshzaban Zavarehi, M., 1999. Nonlinear modeling and validation of solenoid-controlled pilot-operated servovalves. IEEE/ASME Transactions on Mechatronics, 4(3):324-334.

[25]Kim, H.K., Won, D., Kwon, O., et al., 2008. Foot trajectory generation of hydraulic quadruped robots on uneven terrain. Proceedings of the 17th International Federation of Automation Control, Seoul, Korea, p.3021-3026.

[26]Kim, T.J., So, B., Kwon, O., et al., 2010. The energy minimization algorithm using foot rotation for hydraulic actuated quadruped walking robot with redundancy. Proceedings of the 41st International Symposium on Robotics and 6th German Conference on Robotics, Munich, Germany, p.786-791.

[27]Kogler, H., Scheidl, R., 2008. Two basic concepts of hydraulic switching converters. The 1st Workshop on Digital Fluid Power, Tampere, Finland.

[28]Koski, R.E., 1995. Fluid power education—what went wrong? Proceedings of 4th Scandinavian International Conference on Fluid Power, Tampere, Finland, p.71-92.

[29]Krus, P., Jansson, A., Palmberg, J.O., 1991. Optimization for component selection in hydraulic systems. The 4th Bath International Fluid Power Workshop, Bath, UK.

[30]Krus, P., Weddfelt, K., Palmberg, J.O., 1994. Fast pipeline models for simulation of hydraulic systems. Journal of Dynamic Systems, Measurement, and Control, 116(1):132-136.

[31]Kudzma, S., Johnston, D.N., Plummer, A., et al., 2012. A high flow fast switching valve for digital hydraulic systems. The 5th Workshop on Digital Fluid Power, Tampere, Finland.

[32]Lasaar, R., Ivantysynova, M., 2002. Advanced gap design— basis for innovative displacement machines. 3rd International Fluid Power Conference, Aachen, Germany, p.215-229.

[33]Li, Y.B., Li, B., Rong, X.W., et al., 2011. Mechanical design and gait planning of a hydraulically actuated quadruped bionic robot. Journal of Shandong University (Engineering Science), 41(5):32-36 (in Chinese).

[34]Lin, Y., Shi, Y., Burton, R., 2013. Modeling and robust discrete time sliding mode control design for a fluid power electrohydraulic actuator system. IEEE/ASME Transactions on Mechatronics, 18(1):1-10.

[35]Ling, T.G., Rahmat, M.F., Husain, A.R., et al., 2011. System identification of electro-hydraulic actuator servo system. 4th International Conference on Mechatronics, p.1-7.

[36]Linjama, M., 2011. Digital fluid power—state of the art. The 12th Scandinavian International Conference on Fluid Power, Tampere, Finland.

[37]Linjama, M., Huhtala, K., 2009. Digital pump-motor with independent outlets. Proceedings of the 11th Scandinavian International Conference on Fluid Power, Linköping, Sweden.

[38]Liu, R., Alleyne, A., 2000. Nonlinear force/pressure tracking of an electro-hydraulic actuator. Journal of Dynamic Systems, Measurement, and Control, 122(1):232-236.

[39]Manring, N.D., 2003. Valve-plate design for an axial piston pump operating at low displacements. Journal of Mechanical Design, 125(1):200-205.

[40]Manring, N.D., Zhang, Y., 2001. The improved volumetric-efficiency of an axial-piston pump utilizing a trapped-volume design. Journal of Dynamic Systems, Measurement, and Control, 123(3):479-487.

[41]Mauck, L.D., Menchaca, J., Lynch, C.S., 2000. Piezoelectric hydraulic pump development. Wereley, N.M. (Ed.), Smart Structures and Materials: Smart Structures and Integrated Systems, Newport Beach, USA, p.729-739.

[42]Merrill, K.J., Lumkes, J., 2010. Operating strategies and valve requirements for digital pump/motors. Proceedings of the 6th FPNI-PhD Symposium, West Lafayette, p.249-258.

[43]Merrill, K.J., Breidi, F.Y., Lumkes, J.Jr., 2013. Simulation based design and optimization of digital pump/motors. Proceedings of the ASME/BATH Symposium on Fluid Power & Motion Control, Sarasota, Florida, USA.

[44]Muller, M.T., Fales, R.C., 2008. Design and analysis of a two-stage poppet valve for flow control. International Journal of Fluid Power, 9(1):17-26.

[45]Murrenhoff, H., 2007. Trends and some recent developments in mobile hydraulics. Institute for Fluid Power Drives and Controls, RWTH Aachen University, Germany.

[46]Murrenhoff, H., Sgro, S., Vukovic, M., 2014. An overview of energy saving architectures for mobile applications. Proceedings of the 9th International Fluid Power Conference, Aachen, Germany.

[47]NSF (National Science Foundation), 2006. Strategic Implementation Plan, Engineering Research Center for Compact and Efficient Fluid Power. NSF, USA.

[48]Niksefat, N., Sepehri, N., 2000. Design and experimental evaluation of a robust force controller for an electro-hydraulic actuator via quantitative feedback theory. Control Engineering Practice, 8(12):1335-1345.

[49]Opdenbosch, P., Sadegh, N., Book, W.J., 2004. Modeling and control of an electro-hydraulic poppet valve. Proceeding of IMECE, Anaheim, USA, p.103-110.

[50]Opdenbosch, P., Sadegh, N., Book, W.J., 2008. Learning control applied to electro-hydraulic poppet valves. American Control Conference, Seattle, USA, p.1525-1532.

[51]Opdenbosch, P., Sadegh, N., Book, W., et al., 2009. Modeling an electro-hydraulic poppet valve. International Journal of Fluid Power, 10(1):7-15.

[52]Pan, M., Johnston, D.N., Plummer, A., et al., 2014a. Theoretical and experimental studies of a switched inertance hydraulic system. Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering, 228(1):12-25.

[53]Pan, M., Johnston, D.N., Plummer, A., et al., 2014b. Theoretical and experimental studies of a switched inertance hydraulic system including switching transition dynamics, non-linearity and leakage. Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering, 228(10):802-815.

[54]Plummer, A., Vaughan, N., 1996. Robust adaptive control for hydraulic servosystems. ASME Journal of Dynamic Systems, Measurement, and Control, 118(2):237-244.

[55]Pohl, J., Sethson, M., Krus, P., et al., 2001. Modelling and simulation of a fast 2/2 switching valve. 5th International Conference on Fluid Power Transmissions and Control, Hangzhou, China, p.2-22.

[56]Pratt, G.A., 2000. Legged robots at MIT: what’s new since Raibert? IEEE Robotics and Automation Magazine, p.15-19.

[57]Raibert, M., Blankespoor, K., Nelson, G., et al., 2008. BigDog, the rough-terrain quadruped robot. Proceedings of the 17th World Congress, The International Federation of Automatic Control, Seoul, Korea.

[58]Rampen, W.H.S., Salter, S.H., 1990. The digital displacement hydraulic piston pump. Proceedings of the 9th International Symposium on Fluid Power, BHR Group, Cambridge, STI, UK, p.33-46.

[59]Rampen, W.H.S., Almond, J.P., Salter, S.H., 1994. The digital displacement pump/motor operating cycle: experimental results demonstrating the fundamental characteristics. 7th International Fluid Power Workshop, Bath, p.321-331.

[60]Reuter, J., Maerkl, S., Jaekle, M., 2010. Optimized control strategies for fast switching solenoid valves. International Journal of Fluid Power, 11(3):23-33.

[61]Scheidl, R., Manhartsgruber, B., Kogler, H., et al., 2008a. The hydraulic buck converter—concept and experimental results. Proceedings of the 6th International Conference on Fluid Power, Dresden, Germany.

[62]Scheidl, R., Manhartsgruber, B., Winkler, B., 2008b. Hydraulic switching control—principles and state of the art. The 1st Workshop on Digital Fluid Power, Tampere, Finland.

[63]Scheidl, R., Linjama, M., Schmidt, S., 2011. Is the future of fluid power digital? Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering, 226(6):721-723.

[64]Scheidl, R., Kogler, H., Windler, B., 2013. Hydraulic switching control-objectives, concepts, challenges and potential applications. Magazine of Hydraulics, Pneumatics, Tribology, Ecology, Sensorics, Mechatronics, p.7-18.

[65]Schoenau, G.J., Burton, R.T., Kavanagh, G.P., 1990. Dynamic analysis of a variable displacement pump. Journal of Dynamic Systems, Measurement, and Control, 112(1):122-132.

[66]Semini, C., Tsagarakis, N.G., Guglielmino, E., et al., 2011. Design of HyQ-hydraulically and electrically actuated quadruped robot. Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering, 225(6):831-849.

[67]Sha, S., Pan, S.P., Wang, J.Z., et al., 2013. Coupled drive leg of quadrupedal robot mechanism design and analysis of energy consumption. International Conference on Mechatronic Sciences, Electric Engineering and Computer, Shenyang, China.

[68]Sirohi, J., Chopra, I., 2003. Design and development of a high pumping frequency piezoelectric hydraulic hybrid actuator. Journal of Intelligent Materials Systems and Structures, 14(3):135-147.

[69]Sohl, G.A., Bobrow, J.E., 1999. Experiments and simulations on the nonlinear control of a hydraulic servosystem. IEEE Transactions on Control Systems Technology, 7(2):238-247.

[70]Tao, G., Chen, H.Y., He, Z.B., 2002. Optimal design of the magnetic field of a high-speed response solenoid valve. Journal of Materials Processing Technology, 129(1-3):555-558.

[71]Tsao, T., Tomizuka, M., 1994. Robust adaptive and repetitive digital tracking control and application to a hydraulic servo for noncircular machining. ASME Journal of Dynamic Systems, Measurement, and Control, 116(1):24-32.

[72]Tu, H.C., Rannow, M., Van de Ven, J., et al., 2007. High speed rotary pulse width modulated on/off valve. Proceedings of the ASME International Mechanical Engineering Congress, Seattle, Washington, USA, p.1-14.

[73]Tu, H.C., Rannow, M.B., Wang, M., et al., 2012. Design, modelling, and validation of a high-speed rotary pulse-width-modulation on/off hydraulic valve. ASME Journal of Dynamic Systems, Measurement, and Control, 134(6):061002.

[74]Van den Bossche, D., 2006. The A380 flight control electro hydrostatic actuators, achievements and lessons learnt. 25th International Congress of the Aeronautical Sciences, p.1-8.

[75]Vaseena, A., Vacca, A., 2010. Design optimization of the sliding elements of external gear machines. 6th FPNI-PhD Symposium, West Lafayette, USA.

[76]Vaughan, N.D., Gamble, J.B., 1996. The modeling and simulation of a proportional solenoid valve. Journal of Dynamic Systems Measurement and Control, 118:120-125.

[77]Vaughan, N.D., Johnston, D.N., Edge, K.A., 1992. Numerical simulation of fluid flow in poppet valves. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 206(2):119-127.

[78]Wadsley, L., 2011. Optimal system solutions enabled by digital pumps. The 52nd National Conference on Fluid Power.

[79]Wang, Q., Yang, F., Yang, Q., et al., 2011. Experimental analysis of new high-speed powerful digital solenoid valves. Energy Conversion and Management, 52(5):2309-2313.

[80]Watton, J., 2009. Fundamentals of Fluid Power Control. Cambridge University Press, p.11-15.

[81]Wieczorek, U., Ivantysynova, M., 2002. Computer aided optimization of bearing and sealing gaps in hydrostatic machines—the simulation tool CASPAR. International Journal of Fluid Power, 3(1):7-20.

[82]Winkler, B., 2004. Development of a fast low-cost switching valve for big flow rates. 3rd PFNI-PhD Symposium on Fluid Power, Terrassa, Spain.

[83]Winkler, B., Scheidl, R., 2007. Development of a fast seat type switching valve for big flow rates. The 10th Scandinavian International Conference on Fluid Power, Tampere, Finland.

[84]Xiong, Y., Wei, J.H., Feng, R.L., 2015. Adaptive robust control of a high-response dual proportional solenoid valve with flow force compensation. Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering, 229(1):3-26.

[85]Yamaguchi, A., 1966. Studies on the characteristics of axial plunger pumps and motors: 1st Report, Effects of trapping phenomena on the characteristics. Bulletin of Japan Society of Mechanical Engineers, 9(34):305-313.

[86]Yang, H.Y., 2014. Recent fluid power research activities in China. 9th International Fluid Power Conference, Aachen, Germany.

[87]Zeiger, G., Akers, A., 1985. Torque on the swash plate of an axial piston pump. Journal of Dynamic Systems, Measurement, and Control, 107(3):220-226.