Anders H. Hansen
ABSTRACT
A discrete fluid power force system has been proposed as a possible technology for improvement of the energy production of wave energy converters. Discrete force changes may however increase the fatigue loading experienced in the wave energy converter. Various research projects have studied how force oscillations in discrete fluid power systems may be avoided however some system limits sets bounds for the effectiveness of the developed algorithms. In the current study the correlation between force shifting time and fatigue loading is investigated by simulating a discrete fluid power power take-off (PTO) system. The force applied by the PTO system is measured during 100 wave periods and transformed to an equivalent load force. This equivalent load force is compared for various valve shifting times and compared to the energy production. The study shows a request for a trade-off between energy production and the equivalent load.
- M. N. Sahinkaya B. Drew, A. R. Plummer. A review of wave energy converter technology. In Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy. 2016.Google Scholar
- R. H. Hansen, M. M. Kramer, and E. Vidal. Discrete displacement hydraulic power take-off system for the wavestar wave energy converter. Energies, Vol. 6, No. 8, pp. 4001--4044, 2013, 2013.Google ScholarCross Ref
- Anders Hedegaard Hansen and Henrik C. Pedersen. Optimal configuration of a discrete fluid power force system utilised in the pto for wecs. OceanOcean Engineering(2016) 88--89, 2016.Google Scholar
- Anders Hedegaard Hansen, Henrik C. Pedersen, and Torben O. Andersen. Model based feasibility study on bidirectional check valves in wave energy converters. International Journal of Marine Energy 5 (2014) 1--S23, 2014.Google ScholarCross Ref
- Anders Hedegaard Hansen, Magnus F. Asmussen, and Muicheal M. Bech. Model predictive control of a wave energy converter with discrete fluid power power take-off system. Energies 2018, 11, 635, 2018.Google Scholar
- M. Linjama, H-P Vihtanen, A Sipola, and M Vilenius. Secondary controlled multi-chamber hydraulic cylinder. In The 11th Scandinavian International Conference on Fluid Power SICFP'09, 2009.Google Scholar
- Mikko Huova, Arto Laamanen, and Matti Linjama. Energy efficiency of three-chamber cylinder with digital valve system. International Journal of Fluid Power, Volume 11, 2010 issue 3, 2010.Google ScholarCross Ref
- Viktor Donkov, Torben Ole Andersen, Morten Kjeld Ebbesen, and Henrik Clemmensen Pedersen. Applying digital hydraulic technology on a knuckle boom crane. In The Ninth Workshop on Digital Fluid Power, September 7-8, 2017, Aalborg, Denmark, 2017.Google Scholar
- A. H. Hansen and H. C. Pedersen:. Reducing pressure oscillations in discrete fluid power systems. Institution of Mechanical Engineers. Proceedings. Part I: Journal of Systems and Control Engineering, Vol. 230, No. 10, pp. 1093--1105, 2016; 2016.Google Scholar
- Anders Hedegaard Hansen and Henrik C. Pedersen. Avoidance of pressure oscillations in discrete fluid power systems with transmissin lines - an analytical approach. In Proceedings of the 9th JFPS International Symposium on Fluid Power, Matsue, 2014, Oct. 28-31, 2014, 2014.Google Scholar
- Anders Hedegaard Hansen and Henrik C. Pedersen. Energy cost of avoiding pressure oscillations in a discrete fluid power force system. In Proceedings of The 2015 Bath/ASME Symposium on Fluid Power & and Motion Control, FPMC 2015, October 12-14, 2015, Chicago, USA, 2015.Google ScholarCross Ref
- Anders Hedegaard Hansen and Henrik C. Pedersen. Reducing fatigue loading due to pressure shift in discrete fluid power force systems. In Proceedings of the 9th FPNI Ph.D. Symposium on Fluid Power, FPNI2016, October 26-28, 2016, Florianopolis-sc, Brazil, 2016.Google ScholarCross Ref
- Helmut Kogler, Bernd Hans Schmidt, and Rudolf Scheild. Analysis of wave propagation effects in transmission lines due to digital valve switching. In ASME/BATH 2015 Symposium on Fluid Power & Motion Control, 2015.Google ScholarCross Ref
- H. C. Pedersen, R. H. Hansen, A. H. Hansen, T. O. Andersen, and M. M. Bech. Design of full scale wave simulator for testing power take off systems for wave energy converters. International Journal of Marine Energy, Vol. 13, pp. 130--S156, 2016.Google ScholarCross Ref
- R. H. Hansen and M. M. Kramer. Modelling and control of the wavestar prototype. Proceedings of the 9th European Wave and Tidal Energy Conference (EWTEC), Southampton, United Kingdom, Sept. 2011, 2011.Google Scholar
- Hermert Merritt. Hydraulic Control System. John Wiley & Sons, 1967.Google Scholar
- Anders Hedegaard Hansen, Henrik C. Pedersen, and Rico Hjerm Hansen. Validation of simulation model for full scale wave simulator and discrete fuild power pto system. In Proceedings of the 9th JFPS International Symposium on Fluid Power, Matsue, 2014, 2014.Google Scholar
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