ABSTRACT This paper presents the new active absorption wave basin, named Hydrodynamic Calibrator ... more ABSTRACT This paper presents the new active absorption wave basin, named Hydrodynamic Calibrator (HC), constructed at the University of São Paulo (USP), in the Laboratory facilities of the Numerical Offshore Tank (TPN). The square (14 m × 14 m) tank is able to generate and absorb waves from 0.5 Hz to 2.0 Hz, by means of 148 active hinged flap wave makers. An independent mechanical system drives each flap by means of a 1HP servo-motor and a ball-screw based transmission system. A customized ultrasonic wave probe is installed in each flap, and is responsible for measuring wave elevation in the flap. A complex automation architecture was implemented, with three Programmable Logic Computers (PLCs), and a low-level software is responsible for all the interlocks and maintenance functions of the tank. Furthermore, all the control algorithms for the generation and absorption are implemented using higher level software (MATLAB®/Simulink block diagrams). These algorithms calculate the motions of the wave makers both to generate and absorb the required wave field by taking into account the layout of the flaps and the limits of wave generation. The experimental transfer function that relates the flap amplitude to the wave elevation amplitude is used for the calculation of the motion of each flap. This paper describes the main features of the tank, followed by a detailed presentation of the whole automation system. It includes the measuring devices, signal conditioning, PLC and network architecture, real-time and synchronizing software and motor control loop. Finally, a validation of the whole automation system is presented, by means of the experimental analysis of the transfer function of the waves generated and the calculation of all the delays introduced by the automation system.
J. Japan. Soc. Hort. Sci. 59 (2) : 271-274. 1990. Annual Changes in Responsiveness of Shoot Tip C... more J. Japan. Soc. Hort. Sci. 59 (2) : 271-274. 1990. Annual Changes in Responsiveness of Shoot Tip Cultures to Cytokinin in Japanese Persimmon Hirokazu Fukui, Kazuo Nishimoto, Itsuo Murase and Mitsuo Nakamura Faculty of Agriculture, Gifu University, Gifu 501-11 Summary To ...
29th International Conference on Ocean, Offshore and Arctic Engineering: Volume 4, 2010
ABSTRACT A parametric analysis which investigates the effects of the hull main dimensions on the ... more ABSTRACT A parametric analysis which investigates the effects of the hull main dimensions on the seakeeping comfort was proposed to improve a standard SWATH vessel. This study was numerically carried out involving some comfort parameters and worldwide sea conditions. Some types of SWATH and their non-dimensional ratios were considered. The main dimensions of a standard SWATH vessel are: length (L), beam (B), pontoons radius (R), draft (T) and strut thickness (t). Some secondary dimensions were assumed so that a parametric model of wet surface could be designed using MULTISURF, which later was used on WAMIT to evaluate the hydrodynamics coefficients. The TPN receives these coefficients as a basic tool to provide the dynamic response of each SWATH case. The parametric comfort analysis was performed using three usual methodologies applied to evaluate the ship behavior: The ISO2631/3 Severe Discomfort, the MSI (Motion Sickness Incidence) and the VI (Vomiting Incidence).
J. Japan. Soc. Hort. Sci. 60 (4) : 821 - 825. 1992. Varietal Differences in Rooting Ability of In... more J. Japan. Soc. Hort. Sci. 60 (4) : 821 - 825. 1992. Varietal Differences in Rooting Ability of In Vitro Subcultured Japanese Persimmon Shoots Hirokazu Fukui, Kazuo Nishimoto and Mitsuo Nakamura Faculty of Agriculture, Gifu University, Gifu 501-11 Summary In vitro rooting ability was ...
ABSTRACT This paper presents the new active absorption wave basin, named Hydrodynamic Calibrator ... more ABSTRACT This paper presents the new active absorption wave basin, named Hydrodynamic Calibrator (HC), constructed at the University of São Paulo (USP), in the Laboratory facilities of the Numerical Offshore Tank (TPN). The square (14 m × 14 m) tank is able to generate and absorb waves from 0.5 Hz to 2.0 Hz, by means of 148 active hinged flap wave makers. An independent mechanical system drives each flap by means of a 1HP servo-motor and a ball-screw based transmission system. A customized ultrasonic wave probe is installed in each flap, and is responsible for measuring wave elevation in the flap. A complex automation architecture was implemented, with three Programmable Logic Computers (PLCs), and a low-level software is responsible for all the interlocks and maintenance functions of the tank. Furthermore, all the control algorithms for the generation and absorption are implemented using higher level software (MATLAB®/Simulink block diagrams). These algorithms calculate the motions of the wave makers both to generate and absorb the required wave field by taking into account the layout of the flaps and the limits of wave generation. The experimental transfer function that relates the flap amplitude to the wave elevation amplitude is used for the calculation of the motion of each flap. This paper describes the main features of the tank, followed by a detailed presentation of the whole automation system. It includes the measuring devices, signal conditioning, PLC and network architecture, real-time and synchronizing software and motor control loop. Finally, a validation of the whole automation system is presented, by means of the experimental analysis of the transfer function of the waves generated and the calculation of all the delays introduced by the automation system.
J. Japan. Soc. Hort. Sci. 59 (2) : 271-274. 1990. Annual Changes in Responsiveness of Shoot Tip C... more J. Japan. Soc. Hort. Sci. 59 (2) : 271-274. 1990. Annual Changes in Responsiveness of Shoot Tip Cultures to Cytokinin in Japanese Persimmon Hirokazu Fukui, Kazuo Nishimoto, Itsuo Murase and Mitsuo Nakamura Faculty of Agriculture, Gifu University, Gifu 501-11 Summary To ...
29th International Conference on Ocean, Offshore and Arctic Engineering: Volume 4, 2010
ABSTRACT A parametric analysis which investigates the effects of the hull main dimensions on the ... more ABSTRACT A parametric analysis which investigates the effects of the hull main dimensions on the seakeeping comfort was proposed to improve a standard SWATH vessel. This study was numerically carried out involving some comfort parameters and worldwide sea conditions. Some types of SWATH and their non-dimensional ratios were considered. The main dimensions of a standard SWATH vessel are: length (L), beam (B), pontoons radius (R), draft (T) and strut thickness (t). Some secondary dimensions were assumed so that a parametric model of wet surface could be designed using MULTISURF, which later was used on WAMIT to evaluate the hydrodynamics coefficients. The TPN receives these coefficients as a basic tool to provide the dynamic response of each SWATH case. The parametric comfort analysis was performed using three usual methodologies applied to evaluate the ship behavior: The ISO2631/3 Severe Discomfort, the MSI (Motion Sickness Incidence) and the VI (Vomiting Incidence).
J. Japan. Soc. Hort. Sci. 60 (4) : 821 - 825. 1992. Varietal Differences in Rooting Ability of In... more J. Japan. Soc. Hort. Sci. 60 (4) : 821 - 825. 1992. Varietal Differences in Rooting Ability of In Vitro Subcultured Japanese Persimmon Shoots Hirokazu Fukui, Kazuo Nishimoto and Mitsuo Nakamura Faculty of Agriculture, Gifu University, Gifu 501-11 Summary In vitro rooting ability was ...
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