Abstract
This paper presents the results of research related to the transformation of electrical energy into potential and kinetic energy of waves generated on the water surface. The waves are generated to model the environmental conditions for the needs of the model tests. The model tests are performed on model-scale objects to predict the features of full-scale maritime objects. It is done to improve human safety and the survivability of constructions. Electrical energy is transformed into the energy of the water waves using a wave maker. The wave maker considered is a facility with an electrohydraulic drive and an actuator submerged into the water. The actuator movement results in the waves being mechanically-generated in accordance with the wave maker theory. The study aimed to investigate the advantage of the newly implemented fuzzy-logic controller over the hitherto cascading proportional-integral controllers of the wave maker actuator. The research was focused on experimental investigation of the transformation process outcomes harvested under the fuzzy-logic controller, versus the cascading proportional-integral controllers. The waves were generated and measured in the real towing tank, located in the Maritime Advanced Research Centre (CTO S.A.). The investigation confirmed the advantage of the fuzzy-logic controller. It provides more accurate transformation of energy into the desired form of the water waves of specified parameters—frequency and amplitude—and more flat amplitude-frequency characteristic of the transformation process.
Highlights
Physical model tests are of paramount importance for improving the safety of maritime structures.The model tests, carried out on the reduced-scale models (Figure 1), allow the prediction of the properties of full-scale objects, such as ships, oil rigs, wind turbines or wave energy converters, in their environment conditions [1]
The fuzzy-logic controller (FL) was expected to improve the performance of the energy transformation process and obtain a much more flat amplitude-frequency characteristic to provide more accurate control over the process of modeling the environmental conditions
In view of the above, the efficient control of the wave maker is essential for the process of energy transformation into the desired form of two-dimensional progressive sinusoidal waves and for proper realization of the model tests
Summary
Physical model tests are of paramount importance for improving the safety of maritime structures. Η p is a constant coefficient, specific for the facility considered, and is equal to 0.8 [34] It reflects the efficiency of the mechanical energy transformation into the form of the progressive sinusoidal waves due to the pressure loss in the water gap between the walls of the towing tank and the flap of the wave maker. The objectives and scope of the research aimed to investigate the flatness improvement of the amplitude-frequency characteristics for waves generation process with use of the one fuzzy-logic controller (FL), versus the cascading PIs. The FL was expected to improve the performance of the energy transformation process and obtain a much more flat amplitude-frequency characteristic to provide more accurate control over the process of modeling the environmental conditions
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