The dissertation describes the complete cycle of research and development process, realized to improve the existing product: the flap-type wave maker in a model basin; and, finally, to improve the existing service: the seakeeping model tests carried out in hydromechanics laboratory. The demand to be supplied – the high-performance hydromechanics experiments realization to improve the maritime safety – was identified. The problem to be solved – the accurate modelling of waves specific to the type of sea and to the state of sea in a model scale –
t
R=1.31 s
t
n=0.84 s 0.9
0.1
D=0.02
<0.02
t
N=1.41 s
31
was formulated. The available resources – the facilities and the techniques – were conceptualized. The right research to be accomplished – the experiments and simulations carried out on the facilities and models – were realized and analysed. The solution hypothesized to develop and implement – the BBAS approach to modelling of the maritime environment conditions in a model scale with required accuracy – was fulfilled. Finally, the solution was validated. The future development conception – the use of high-performance electric drive – was considered and modelled with a great results.
The greatest achievements of the doctoral dissertation are:
improvement of an existing product – the flap-type wave maker – through a development of a new complete control system with a wave spectrum-feedback (BBAS) for a real towing tank in the hydromechanics laboratory;
improvement of an existing service – significant facilitate the seakeeping model tests – provided to the maritime industry to improve the maritime safety;
development of the fuzzy-logic controller to control the velocity and the position of the wave maker flap, ready-made for broad distribution within BBAS to hydromechanics laboratories;
development of the non-invasive, contactless, and maintenance-free ultra-sound system for measurement of the wave profile, applied for a patent and ready-made to broad distribution for a wave profile measurements;
improvement of the Quality Management System of the Maritime Advanced Research Centre, CTO S.A.
The significant achievement of the doctoral dissertation is the supply of the complete control system that allow to model the environmental conditions with high accuracy in a time-efficient, low-cost, user-friendly and an automatic manner. It greatly contributes to perform the seakeeping model tests in the Maritime Advanced Research Centre, CTO S.A. It allows to determine accurately the properties of the naval and offshore objects to improve the human safety and survivability of the constructions. This unique solution has been already used in the research and commercial projects of different vessels for numerous clients – domestic and international.
The projects included navy vessels, special purposes vessels, passenger vessels, container vessels, gas carriers as well as fishing vessels.
Another significant achievement of the dissertation is that the control system developed, is a ready-made for broad distribution as a catalogue product of the Maritime Advanced Research Centre, CTO S.A to another hydromechanics laboratories. 61.1% of the wave makers in towing tanks worldwide are single unit and 43.2% are equipped with hydraulic driving mechanism [1], such as the one considered in the dissertation. The modernization of these research facilities can be low-costly carried out to make them the user-friendly, time-efficient and low employee-offload.
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Moreover, the implementation of the developed system to the control of the fully electric drive with a multi-segmented flap is easy to execute. This is of great importance due to the fact that 51.3%
of the wave makers in towing tanks worldwide are equipped with electric driving mechanism [1]
and the use of electric drives constantly increases.
The method and the ultra-sound device for a wave profile measurement on the surface of liquid, were developed and implemented within the works related to the dissertation. It is the subject of a Polish and an European patent application [44], [45]. The method and the device developed are the ready-made products for a wave profile measurements and can be also broadly distributed as a catalogue product of the Maritime Advanced Research Centre, CTO S.A.
The solution developed under the dissertation, enabled the Author to develop the procedures [46]-[48]. The procedures were incorporated as the internal documents included in the Quality Management System of the Maritime Advanced Research Centre, CTO S.A., certified under ISO 9001:2015. Hence, the works within the dissertation, also improved the Quality Management System of the research centre.
Besides, due to the resources available in the deepwater towing tank, the hydraulic drive was applied within the dissertation. From the point of view of the general trend, the PMSM is more worth considering as the wave maker drive. To date, the 51.3% of wave makers worldwide are equipped with the electric driving mechanism, versus the 43.2% equipped with the hydraulic one [1]. According to the trend the number of the electric drive applications is expected to increase.
Thus, within the future works it is recommended to apply the electric drive and insight into more advanced solutions for improvement of the model tests different than the typical seakeeping tests at a desired state of sea in a model scale.
Among the more advanced methods related to modelling of environmental conditions, the worthy of future consideration are:
the active absorption of the waves to further shorten the time interval between subsequent realizations, needed to calm the water [1];
multi-segmented flap for the active absorption of transverse waves instead of the straighteners to shorten the wave maker section and lengthen the test section of the towing tank;
method to suppress the nonlinear components, that would be unintended while the monochromatic waves generation [21];
sensorless drive to control the flap-velocity and flap-position at reduced costs and reduced maintenance [38].
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BIBLIOGRAPHY
[1] A. Iafrati et al., Report of the Specialist Committee on Modelling of Environmental Conditions, Proceedings of 28th ITTC, September 2017, Volume II, Appendix A:
QUESTIONNAIRE ON MODELLING OF ENVIRONMENTAL CONDITIONS.
[2] G. G. Cox et. Al., Report of the Seakeeping committee, Proceedings of the 17th ITTC, 1984, Volume I, p. 482.
[3] C. T. Stansberg et. Al., The Specialist Committee on Waves, Final Report and Recommendations to the 23rd ITTC, Proceedings of the 23rd ITTC, 2002, Volume II, APPENDIX A: SPECTRAL FORMULATIONS.
[4] P. Gualeni et. Al., ITTC Quality System Manual, Recommended Procedures and Guidelines, Procedure, Model Tests on Damage Stability in Waves, Specialist Committee on Stability in Waves of the 28th ITTC, September 2017, p. 8.
[5] T. H. Havelock, Forced surface-wave on water, Philosophical Magazine, 1929, Series 7, Volume 8, Issue 51, pp. 569-576.
[6] F. Biésel and F. Suquet, Les appareils en générateurs laboratoire, Laboratory wave generating apparatus, La Houille Blanche: No. 2, March-April 1951, pp. 147-165; No. 4 July-August 1951, pp. 475-496; No. 5, September-October 1951, pp. 723-737; No. 6, December 1952, pp. 779-801.
[7] O. S. Madsen, On the generation of long waves, Journal of Geophysical Research, 76, 1971, pp. 8672-8683.
[8] R. T. Hudspeth and W. Sulisz, Stokes drift in 2-D wave flumes, Journal of Fluid Mechanics, 230, 1991, pp. 209-229.
[9] W. Sulisz and R. T. Hudspeth, Complete second order solution for water waves generated in wave flumes, Journal of Fluids and Structures, 7(3), 1993, pp. 253-268.
[10] W. I. Moubayed and A. N. Williams, Second-order bichromatic waves produced by a generic planar wave maker in a two-dimensional wave flume, Journal of Fluids and Structures, 8, 1994, pp. 73-92.
[11] H. A. Schaffer, Second-order wave maker theory for irregular waves, Ocean Engineering, 23, 1996, pp. 47-88.
[12] R H. Multer, Exact nonlinear model of wave generator, Journal of Hydraulic Research, ASCE, 99, 1973, pp. 31-46.
[13] S. Grilli and J. Horrillo, Numerical Generation and Absorption of Fully Nonlinear Periodic Waves, Journal of Engineering Mechanics, 123(10), 1997, pp. 1060-1069.
[14] P. Troch and J. De Rouck, An active wave generating-absorbing boundary condition for VOF type numerical model, Coastal Engineering, 38, 1999, pp. 223-247.
[15] S-X. Liu, B. Teng and Y-X. Yu, Wave generation in a computation domain, Applied Mathematical Modelling, 29, 2005, pp. 1-17.
[16] F. Bonnefoy, D. Le Touzé and P. Ferrant, A fully-spectral time-domain model for second-order simulation of wavetank experiments, Part A: formulation, implementation and numerical properties, Applied Ocean Research, 28, 2006, pp. 33–43
[17] X. T. Zhang, B. C. Khoo and J. Lou., Wave propagation in a fully nonlinear numerical wave tank: A desingularized method, Ocean Engineering, 33, 2006, pp. 2310-2331 [18] J. Zheng, M. M. Soe, C. Zhang and T-W. Hsu, Numerical wave flume with improved
smoothed particle hydrodynamics, Journal of Hydrodynamics, 22(6) 2010, pp. 773-781 [19] G. Ducrozet, F. Bonnefoy, D. Le Touze and P. Ferrant, A modified High-Order Spectral method for wave maker modelling in a numerical wave tank, European Journal of Mechanics B/Fluids, 2012, 34, pp. 19-34.
34
[20] X. Liu, P. Lin and S. Shao, ISPH wave simulation by using an internal wave maker, Coastal Engineering, 95, 2015, pp. 160-170.
[21] M. Drzewiecki, W. Sulisz, Generation and Propagation of Nonlinear Waves in a Towing Tank, Polish Maritime Research, No 1, Vol. 26, Issue 101, 2019.
[22] M. Drzewiecki, Digital control system of the wave maker in the towing tank, Automatyka Elektryka Zakłócenia, No 7, Volume 7, Issue 26, 2016, pp. 138-146.
[23] P. Frigaard, T. L. Andersen, Technical Background Material for the Wave Generation Software AwaSys 5, DCE Technical Reports, No 64, Aalborg University Department of Civil Engineering, 2010, pp. 17-30.
[24] M. Drzewiecki, Control of the Waves in a Towing Tank with the Use of a Black-Box Model, Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej, No 59, Wydawnictwo Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej, 2018.
[25] K.J. Åström, Adaptive Feedback Control, Proceedings of the IEEE, Vol. 75, No 2, 1987.
[26] K.J. Åström, B. Wittenmark, Adaptive Control, Addison-Wesley Publishing Company, 1989.
[27] D. Driankov, H. Hellendoorn, M. Reinfrank, An Introduction to Fuzzy Control, Springer-Verlag Berlin Heidelberg, 1993.
[28] R. Śmierzchalski, Materiały pomocnicze do wykładu z MSI, Gdańsk University of Technology, Faculty of Electrical and Control Engineering, PhD course materials, Course: Metody Sztucznej Inteligencji, pp. 20-31.
[29] K. Michels, R. Kruse, Numerical Stability Analysis for Fuzzy Control, International Journal of Approximate Reasoning, 1997.
[30] M. Drzewiecki, CASCADE CONTROL SYSTEM OF THE WAVE GENERATOR FOR TOWING TANK, Master thesis, Faculty of Electrical and Control Engineering, Gdańsk University of Technology, 2015.
[31] C. Campos, F. Silveira and M. Mendes, WAVES INDUCED BY NON-PERMANENT PADDLE MOVEMENTS, Coastal Engineering Proceedings, vol. 13, 1972, pp. 707-722.
[32] A. Iafrati et al., Laboratory Modelling of Waves: regular, irregular and extreme events, Guideline of 28th ITTC, ITTC Quality System Manual, Recommended Procedures and Guidelines, September 2017.
[33] J. Spinneken and C. Swan, Second-order wave maker theory using force-feedback control. Part II. An experimental verification of regular wave generation, Ocean Engineering Volume 36, Issue 8, June 2009, Pages 539-548
[34] J. Spinneken and C. Swan, Second-order wave maker theory using force-feedback control. Part II. An experimental verification of regular wave generation, Ocean Engineering, Volume 36, Issue 8, June 2009, Pages 549-555.
[35] M. Drzewiecki, THE MODERNIZING OF CASCADE CONTROL SYSTEM OF THE WAVE GENERATOR FOR TOWING TANK, Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej, No 47, Wydawnictwo Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej, 2015.
[36] M. Drzewiecki, RAPORT TECHNICZNY RH-2018/T-055 WALIDACJA SPÓJNEGO SYSTEMU MODELOWANIA FAL Z REGULATOREM WYKORZYSTUJĄCYM LOGIKĘ ROZMYTĄ, ZAKŁAD BADAWCZO ROZWOJOWY OŚRODEK HYDROMECHANIKI OKRĘTU CTO S.A., Gdańsk 2018.
[37] MOOG ,Servo valve catalog, Direct Drive Proportional Valves Series D633 and D634, website: https://www.moog.com/products/servovalves-servo-proportional- valves/industrial/flow-control/analog-with-integrated-electronics/direct-operated-servo-valves-for-analog-signals-d633-and-d634-series.html
35
[38] H. Abu-Rub, A. Iqbal, J. Guziński, High Performance Control of AC Drives with MATLAB/Simulink Models, First Edition, 2012 John Wiley & Sons, Ltd. Published 2012 by John Wiley & Sons, Ltd.
[39] F. Lechevallier, 12 METRE WAVE GENERATOR OPERATOR’S MANUAL, ALSTHOM techniques des fluids, March 1974, Maritime Advanced Research Centre CTO S.A.
archives.
[40] Rumatowski, K., Podstawy automatyki Część 1 Układy liniowe o działaniu ciągłym, Wydawnictwo Politechniki Poznańskiej, Poznań 2004.
[41] K. Sinthipsomboon, I. Hunsacharoonroj, J. Khedari, W. Pongaen and P. Pratumsuwan, A Hybrid of Fuzzy and Fuzzy Self-Tuning PID Controller for Servo Electro-Hydraulic System, Volume: Fuzzy Controllers – Recent Advances in Theory and Applications, edited by: S. Iqbal, N. Boumella and J. C. F. Garcia, IntechOpen, September 2012.
[42] L. Jianxin, T. Ping, Fuzzy Logic Control of Integrated Hydraulic Actuator Unit Using High Speed Switch Valves, International Conference on Computational Intelligence and Natural Computing, 2009.
[43] D. M. Wonohadidjojo, G. Kothapalli, M. Y. Hassan, Position Control of Electro-Hydraulic Actuator using Fuzzy Logic Controller Optimized by Particle Swarm Optimization, International Journal of Automation and Computing, Volume 10, Issue 3, June 2013, pp. 181–193
[44] M. Drzewiecki (Inventor), Centrum Techniki Okrętowej S.A. (Applicant), Sposób pomiaru profilu fali w czasie rzeczywistym na powierzchni cieczy, zwłaszcza w basenie modelowym i urządzenie ultradźwiękowe do pomiaru profilu fali w czasie rzeczywistym na powierzchni cieczy, zwłaszcza w basenie modelowym, Polish patent application No.
P.427435, Polish Patent Office, Warsaw, October 2018.
[45] M. Drzewiecki (Inventor), Centrum Techniki Okrętowej S.A. (Applicant), A method and an ultra-sound device for a wave profile measurement in real time on the surface of liquid, particularly in a model basin, European patent application No. EP19460026.8, European Patent Office, Munich, May 2019.
[46] M. Drzewiecki, PROCEDURA WYKONAWCZA PRZYGOTOWANIA SYSTEMU FALOWEGO DO POMIARU I ANALIZY FAL BASENOWYCH, Internal procedure of Quality Management System of the CTO S.A. Maritime Advanced Research Centre, Gdańsk, November 2019.
[47] M. Drzewiecki, PROCEDURA WYKONAWCZA PROJEKTOWANIA FAL BASENOWYCH, Internal procedure of Quality Management System of the CTO S.A.
Maritime Advanced Research Centre, Gdańsk, November 2019.
[48] M. Drzewiecki, PROCEDURA WYKONAWCZA GENEROWANIA FAL BASENOWYCH, Internal procedure of Quality Management System of the CTO S.A.
Maritime Advanced Research Centre, Gdańsk, November 2019.