“Improving Energy Efficiency and Response Time of an Offshore Winch Drive with Digital Displacement Motors”
Authors: Thomas Farsakoglou, Henrik C. Pedersen, Morten K. Ebbesen and Torben Ole Andersen,Affiliation: Aalborg University and University of Agder
Reference: 2023, Vol 44, No 3, pp. 111-124.
Keywords: Offshore, Digital Hydraulics, Winch Drive, Energy Efficiency, Valves
Abstract: Offshore winch drives require high energy efficiency and control precision, making digital displacement motors an attractive solution due to their high efficiency and potential controllability. However, the response time and the realized energy efficiency of these motors are heavily dependent on the chosen displacement control strategy, especially at low-speed operation. This paper considers various displacement control strategies to investigate whether digital displacement motors are a viable solution for offshore winch drive applications. The motor specifications are derived based on the requirements of a commercial offshore winch drive system. The analysis reveals that various displacement control strategies should be used across the drive's operational speed range to ensure both satisfactory performance and high efficiency. Full-stroke and partial-stroke strategies are optimal for speeds above 28 rpm and 20 rpm, respectively, but unsuited for lower-speed operation. For speeds below 20 rpm, an improved sequential-stroke strategy is therefore presented. The proposed displacement control strategy provides instantaneous motor response and maintains high energy efficiency, although its robustness is slightly reduced at higher operating speeds above 20 rpm.
PDF (22808 Kb)
DOI: 10.4173/mic.2023.3.2References:
[1] Diinef. (2023). Digital Distributor Valve System (DDVS) | Diinef, com. 2023. https://www.diinef.com/digital-distributor-valve-system-ddvs.
[2] DNV. (2011). DNV-RP-H103: Modelling and Analysis of Marine Operations, 2011.
[3] Farsakoglou, T., Bhola, M., Ebbesen, M.K., Andersen, T.O., and Pedersen, H.C. (2022). Valve Specification Requirements For Digital Hydraulic Winch Drives, In Digital Fluid Power Workshop DFP22. Edinburgh, Scotland, pages 74--89.
[4] Heikkila, M., Tammisto, J., Huova, M., Huhtala, K., and Linjama, M. (2010). Experimental Evaluation of a Piston-Type Digital Pump-Motor-Transformer with Two Independent Outlets, In Fluid Power and Motion Control 2010. FPMC 2010, Bath, UK.
[5] Johansen, P., Roemer, D.B., Andersen, T.O., and Pedersen, H.C. (2015). Delta-Sigma Modulated Displacement of a Digital Fluid Power Pump, In Proc. 7th Workshop on Digital Fluid Power. LCM GmbH, pages 1--9.
[6] Larsen, H.B., Kjelland, M., Holland, A., and Lindholdt, P.N. (2018). Digital Hydraulic Winch Drives, In BATH/ASME 2018 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers Digital Collection. doi:10.1115/FPMC2018-8858
[7] Lindholdt, P.N., Larsen, H.B., and As, D. (2017). Digital Distributor Valves In Low Speed Motors - Practical Approach, In The Ninth Workshop on Digital Fluid Power. Aalborg, Denmark, page12.
[8] Merrill, K.J. (2012). Modeling and Analysis of Active Valve Control of a Digital Pump-Motor, Ph.D. thesis, Purdue University, United States -- Indiana.
[9] Moslaatt, G.-A., Padovani, D., and Hansen, M.R. (2019). A Control Algorithm for Active/Passive Hydraulic Winches Used in Active Heave Compensation, In ASME/BATH 2019 Symp. on Fluid Power and Motion Control. ASME Digital Collection. doi:10.1115/FPMC2019-1710
[10] Moslaatt, G.-A., Padovani, D., and Hansen, M.R. (2020). A Digital Twin for Lift Planning With Offshore Heave Compensated Cranes, Journal of Offshore Mechanics and Arctic Engineering. 143(3). doi:10.1115/1.4048881
[11] Nordaas, S. (2020). Using Digital Hydraulics in Secondary Control of Motor Drive, Ph.D. thesis, Faculty of Engineering and Science, University of Agder, Grimstad, Norway.
[12] Nordaas, S., Beck, M.M., Ebbesen, M.K., and Andersen, T.O. (2019). Dynamic Response of a Digital Displacement Motor Operating with Various Displacement Strategies, Energies. 12(9):1737. doi:10.3390/en12091737
[13] Norgaard, C. (2017). Design, Optimization and Testing of Valves for Digital Displacement Machines, Ph.D. thesis, Department of Energy Technology, Aalborg University, Aalborg, Denmark. doi:10.5278/vbn.phd.eng.00013
[14] NOV. (2022). NOV Website, 2022. https://www.nov.com/.
[15] Payne, G.S., Kiprakis, A.E., Ehsan, M., Rampen, W. H.S., Chick, J.P., and Wallace, A.R. (2007). Efficiency and dynamic performance of Digital Displacementtrademark hydraulic transmission in tidal current energy converters, Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy. 221(2):207--218. doi:10.1243/09576509JPE298
[16] Pedersen, N.H. (2018). Development of Control Strategies for Digital Displacement Units, Ph.D. thesis, Department of Energy Technology, Aalborg University, Aalborg, Denmark.
[17] Pedersen, N.H., Johansen, P., and Andersen, T. (2018). Challenges with Respect to Control of Digital Displacement Hydraulic Units, Modeling, Identification and Control: A Norwegian Research Bulletin, 2018. 39:91--105. doi:10.4173/mic.2018.2.4
[18] Pedersen, N.H., Johansen, P., and Andersen, T.O. (2016). LQR Feedback Control Development for Wind Turbines Featuring a Digital Fluid Power Transmission System, In 9th FPNI Ph.D. Symp. on Fluid Power. ASME Digital Collection. doi:10.1115/FPNI2016-1537
[19] Pedersen, N.H., Johansen, P., and Andersen, T.O. (2017). Event-Driven Control of a Speed Varying Digital Displacement Machine, In ASME/BATH 2017 Symp. on Fluid Power and Motion Control. ASME Digital Collection. doi:10.1115/FPMC2017-4260
[20] Pedersen, N.H., Johansen, P., and Andersen, T.O. (2018). Optimal control of a wind turbine with digital fluid power transmission, Nonlinear Dynamics, 2018. 91(1):591--607. doi:10.1007/s11071-017-3896-0
[21] Pedersen, N.H., Johansen, P., and Andersen, T.O. (2020). Feedback Control of Pulse-Density-Modulated Digital Displacement Transmission Using a Continuous Approximation, IEEE/ASME Transactions on Mechatronics. 25(5):2472--2482. doi:10.1109/TMECH.2020.2980122
[22] Roemer, D.B. (2014). Design and Optimization of Fast Switching Valves for Large Scale Digital Hydraulic Motors, Ph.D. thesis, Department of Energy Technology, Aalborg University, Aalborg, Denmark.
[23] Romer, D., Johansen, P., Pedersen, H.C., and Andersen, T.O. (2013). Analysis of Valve Requirements for High-Efficiency Digital Displacement Fluid Power Motors, In Proc. 8th Intl. Conf. Fluid Power Transmission and Control. World Publishing Cooperation, Hangzhou, China, pages 122--126, 2013.
[24] Williamson, C. and Manring, N. (2019). A More Accurate Definition of Mechanical and Volumetric Efficiencies for Digital Displacementregistered Pumps, In ASME/BATH 2019 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers Digital Collection. doi:10.1115/FPMC2019-1668
BibTeX:
@article{MIC-2023-3-2,
title={{Improving Energy Efficiency and Response Time of an Offshore Winch Drive with Digital Displacement Motors}},
author={Farsakoglou, Thomas and Pedersen, Henrik C. and Ebbesen, Morten K. and Andersen, Torben Ole},
journal={Modeling, Identification and Control},
volume={44},
number={3},
pages={111--124},
year={2023},
doi={10.4173/mic.2023.3.2},
publisher={Norwegian Society of Automatic Control}
};