The Experts below are selected from a list of 9 Experts worldwide ranked by ideXlab platform
Akihiko Fujii - One of the best experts on this subject based on the ideXlab platform.
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Study on the design of propeller blade sections using the optimization algorithm
Journal of Marine Science and Technology, 2005Co-Authors: Yoshihisa Takekoshi, Takafumi Kawamura, Hajime Yamaguchi, Masatsugu Maeda, Tadashi Taketani, Koyu Kimura, Norio Ishii, Akihiko FujiiAbstract:A new method for designing propeller blade sections is presented. A vortex lattice method is used to evaluate the performance and the time-dependent pressure distribution on the blade surFace in a non-uniform flow, while efficient optimization algorithms are used to modify the blade sections. Two different designs were carried out in this study. The first was a design to realize a target pressure distribution in a rotating three-dimensional flow. A two-dimensional wing theory was used to obtain the target pressure distribution. The predicted increase in efficiency and the reduction in the cavity volume were confirmed by model experiments. The second was a design to maximize the propeller efficiency. By this method, the propeller efficiency was improved by 1.2% under the constrains of constant thrust and a prescribed margin for Face Cavitation.
Yoshihisa Takekoshi - One of the best experts on this subject based on the ideXlab platform.
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Study on the design of propeller blade sections using the optimization algorithm
Journal of Marine Science and Technology, 2005Co-Authors: Yoshihisa Takekoshi, Takafumi Kawamura, Hajime Yamaguchi, Masatsugu Maeda, Tadashi Taketani, Koyu Kimura, Norio Ishii, Akihiko FujiiAbstract:A new method for designing propeller blade sections is presented. A vortex lattice method is used to evaluate the performance and the time-dependent pressure distribution on the blade surFace in a non-uniform flow, while efficient optimization algorithms are used to modify the blade sections. Two different designs were carried out in this study. The first was a design to realize a target pressure distribution in a rotating three-dimensional flow. A two-dimensional wing theory was used to obtain the target pressure distribution. The predicted increase in efficiency and the reduction in the cavity volume were confirmed by model experiments. The second was a design to maximize the propeller efficiency. By this method, the propeller efficiency was improved by 1.2% under the constrains of constant thrust and a prescribed margin for Face Cavitation.
Letizia Savio - One of the best experts on this subject based on the ideXlab platform.
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cpp propeller Cavitation and noise optimization at different pitches with panel code and validation by Cavitation tunnel measurements
Ocean Engineering, 2012Co-Authors: Daniele Bertetta, Stefano Brizzolara, Michele Viviani, Stefano Gaggero, Letizia SavioAbstract:Abstract The propeller design is an activity which nowadays presents ever increasing challenges to the designer, involving not only the usual mechanical characteristics fulfillment and Cavitation erosion avoidance, but also other Cavitation side effects, such as radiated noise and/or pressure pulses. Moreover, in some cases propeller characteristics have to be optimized in correspondence to very different functioning points, including considerably off-design conditions, hardly captured by conventional design methods. In the present paper, a recently presented method, based on the coupling between a multiobjective optimization algorithm and a panel code, is applied to the design of a CPP propeller at different pitch settings, with the aim of reducing the cavitating phenomena and, consequently, the resultant radiated noise. Particular attention has been devoted to the slow speed (low pitch) condition, obtained at constant RPM, and characterized by considerable radiated noise and vibrations related to Face Cavitation. Numerical results are validated by means of an experimental campaign, testing both the original and the optimized geometry in terms of Cavitation extent and radiated noise. Experimental results confirm the numerical predictions, attesting the capability of the method to assess propeller functioning characteristics, thus representing a very useful tool for the designer in correspondence of challenging problems.
Takafumi Kawamura - One of the best experts on this subject based on the ideXlab platform.
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Study on the design of propeller blade sections using the optimization algorithm
Journal of Marine Science and Technology, 2005Co-Authors: Yoshihisa Takekoshi, Takafumi Kawamura, Hajime Yamaguchi, Masatsugu Maeda, Tadashi Taketani, Koyu Kimura, Norio Ishii, Akihiko FujiiAbstract:A new method for designing propeller blade sections is presented. A vortex lattice method is used to evaluate the performance and the time-dependent pressure distribution on the blade surFace in a non-uniform flow, while efficient optimization algorithms are used to modify the blade sections. Two different designs were carried out in this study. The first was a design to realize a target pressure distribution in a rotating three-dimensional flow. A two-dimensional wing theory was used to obtain the target pressure distribution. The predicted increase in efficiency and the reduction in the cavity volume were confirmed by model experiments. The second was a design to maximize the propeller efficiency. By this method, the propeller efficiency was improved by 1.2% under the constrains of constant thrust and a prescribed margin for Face Cavitation.
Hajime Yamaguchi - One of the best experts on this subject based on the ideXlab platform.
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Study on the design of propeller blade sections using the optimization algorithm
Journal of Marine Science and Technology, 2005Co-Authors: Yoshihisa Takekoshi, Takafumi Kawamura, Hajime Yamaguchi, Masatsugu Maeda, Tadashi Taketani, Koyu Kimura, Norio Ishii, Akihiko FujiiAbstract:A new method for designing propeller blade sections is presented. A vortex lattice method is used to evaluate the performance and the time-dependent pressure distribution on the blade surFace in a non-uniform flow, while efficient optimization algorithms are used to modify the blade sections. Two different designs were carried out in this study. The first was a design to realize a target pressure distribution in a rotating three-dimensional flow. A two-dimensional wing theory was used to obtain the target pressure distribution. The predicted increase in efficiency and the reduction in the cavity volume were confirmed by model experiments. The second was a design to maximize the propeller efficiency. By this method, the propeller efficiency was improved by 1.2% under the constrains of constant thrust and a prescribed margin for Face Cavitation.
