In this research, a time-proven concept from the aircraft industry supports development and application of an electrohydraulic actuator (EHA) in stationary application. EHA allows to achieve high power density and high performance in a compact package as well as flexibility in system architecture for stationary applications. The electrohydraulic actuator can eliminate hoses, fittings, valves and fixtures and is easy to integrate into larger systems. Due to good energy efficiency, cooling usually is not required. However, a thermo-dynamic analysis clearly indicates that the electric machine is acting as a high temperature heat source, while the hydraulics of the actuator maintain relatively lower temperature. Therefore, this paper targets the simulation of the thermal behavior of a pump-controlled actuator by means of lumped parameter model in order to predict the operational temperature. The developed model is validated against measurements utilizing thermocouples under various operative conditions. Conclusions are drawn concerning thermal behavior and energy dissipation of the proposed pump-controlled actuator.
Thermal modelling, losses, efficiency, pump-controlled actuator, stationary application
[1] Skinner J., Smith A., Frischemeoer S., Holland M., Advancements in Hydraulic systems for more electric aircraft, proceedings of MEA 2015 conference, Toulouse, France, February 2015
[2] Youzhe Ji, Song Peng, Li Geng, Zhanlin Wang, Lihua Qiu, Pressure Loop Control of Pump and Valve Combined EHA Based on FFIM, The Ninth International Conference on Electronic Measurement & Instruments, 2009 ;
[3] Qian Zhang, Bingqiang Li, Feedback Linearization PID Control for Electro-hydrostatic Actuatora, 2011
[4] Liang, B. & Li, Y. & Zhang, Z. Research on Simulation of Aircraft Electro-Hydrostatic Actuator Anti-Skid Braking System (ICMTMA), 2011;
[5] Altare G., Vacca A., Richter, C. A novel pump design for an efficient and compact Electro-Hydraulic Actuator, IEEE aerospace Conference, 2014 IEEE, 2014 , Page(s): 1 – 12
[6] Kyoung Kwan Ahn, Doan Ngoc Chi Nam, Maolin Jin, Adaptive Backstepping Control of an Electrohydraulic Actuator, IEEE/ASME Transactions on Mechatronics, Vol. 19, No. 3, June 2014.
[7] Busquets E., Ivantysynova M., The World’s First Displacement Controlled Excavator Prototype with Pump Switching - A Study of the Architecture and Control 9th JFPS International Symposium on Fluid Power, 324 – 331
[8] Daher N., Ivantysynova, M., Electro-hydraulic energysaving power steering systems of the future. Teoksessa: Proceedings of the 7th FPNI PhD Symposium on Fluid Power, 2012.
[9] Hänninen H., Minav T., Pietola M., Replacing a constant pressure valve controlled system with a pump controlled system, Proceedings of the 2016 Bath/ASME Symposium on Fluid Power and Motion Control, FPMC2016, Sept 7-9, 2016, Bath, UK
[10] Michel, S. Weber, J., Electrohydraulic compact-drives for low power applications considering energyefficiency and high inertial loads. 2012
[11] Michel S., et.al. Energy-efficiency and thermo energetic behavior of electrohydraulic compact drives, 9th IFK conf. 2014
[12] Busquets E., An investigation of the cooling power requirements for displacement-controlled multi-actuator machines, 2013
[13] Michel, S. and Weber, J. Prediction of the thermosenergetic behavior of an electrohydraulic compact drive. Proc. of the 10th International Fluid Power Conference. Dresden, Germany, 8-10 March 2016.
[14] Minav, T., Papini L., Pietola, M. Thermal analysis of Direct Driven Hydraulics, 8-10 March 2016, Proceedings of the IFK-2016, Dresden, Germany.
[15] Karlen N., Minav T., Pietola M., Investigation of thermal effects in direct-driven hydraulic system for off-road machinery, Proceedings of the ASME 2016 9th FPNI Ph.D. Symposium on Fluid Power, FPNI2016, October 26-28, 2016, Florianópolis, SC, Brazil
[16] Vivoil motor, Data Sheet: reversible motor - series XV, [Online]. Available: http://www.vivoil.com/files/xm_en/xm201.pdf
[17]Pikapaja OY. MIRO Hydraulisylinterit hydraulcylindrar, 2009. URL http://www.pikapaja.fi/MIRO_cylinders_FIN+SWE.pdf
[18] Järf A., Minav T., Pietola M., (2016) “Nonsymmetrical flow compensation using hydraulic accumulator in direct driven differential cylinder”, Proceedings of the ASME 2016 9th FPNI Ph.D. Symposium on Fluid Power, FPNI2016, October 26-28, 2016, Florianópolis, SC, Brazil
[19] Emerson Control Techniques Unimotor 115U 2C, http://www.emersonindustrial.com/en/en/documentcenter/ControlTechniques/Brochures/unimotor_fm_product_data.pdf.
[20] Emerson Control Techniques Unidrive SP1406 drive, http://www.emersonindustrial.com.
[21] Gemssensors 3100R0400S pressure transducers, http://www.gemssensors.com/Products/Pressure/Pressure-Tranducers, visited on September, 2013
[22] SIKO SGI (IV58M-0039), http://www.sikoglobal. com/en-de , visited on October, 2013.
[23] Kracht GmbH. Gear Type Flow Meter VC, 2012. URL http://kracht.eu/uploads/tx_ttproducts/datasheet/VC_GB_01-12_neu.pdf.
[24] Thermocouple Data Logger, [online], https://www.picotech.com/datalogger/tc-08/thermocouple-data-logger
[25] Minav T., Papini L., Järf A., Tammi K., Pietola M., Direct Driven hydraulics: What possible can go wrong? -Thermal analysis, Proceedings of the ICEM 2016, Lausanne, Switzerland September 4-7, 2016.
[26]Graessner. Power gear, 2014. URL http://www.graessner.de/en/PowerGear_GB6379.pdf.
