A First Principles Analysis of Alternative Marine Propulsion Mechanisms
Year: 2017 Language: english Author: Stephen Olis Genre: Technical book Format: PDF Quality: eBook Pages count: 88 Description: The marine propulsion industry is constantly looking for ways to improve propulsion efficiency. Since the industry is dominated by propellers, it begs the question of whether propellers are the best options for every task. Therefore first-principles analyses of three alternative mechanisms were conducted: feathered paddlewheels, caterpillar drives, and jellyfish actuators. Equations predicting the thrust and power generated by each mechanism were developed and used to compute efficiency. Efficiency comparisons were made to ideal propellers attempting similar tasks. The Kramer diagram was used to determine the efficiency of ideal propellers. From these results, recommendations were made to theorists and experimentalists hoping to build off the theory developed here. Results indicate that caterpillar drives (a) have potential due to their ability to maintain efficiency after significant internal friction losses and (b) may be more efficient than propellers in non-ideal speeds.
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A First Principles Analysis of Alternative Marine Propulsion Mechanisms
Language: english
Author: Stephen Olis
Genre: Technical book
Format: PDF
Quality: eBook
Pages count: 88
Description: The marine propulsion industry is constantly looking for ways to improve propulsion efficiency. Since the industry is dominated by propellers, it begs the question of whether propellers are the best options for every task. Therefore first-principles analyses of three alternative mechanisms were conducted: feathered paddlewheels, caterpillar drives, and jellyfish actuators. Equations predicting the thrust and power generated by each mechanism were developed and used to compute efficiency. Efficiency comparisons were made to ideal propellers attempting similar tasks. The Kramer diagram was used to determine the efficiency of ideal propellers. From these results, recommendations were made to theorists and experimentalists hoping to build off the theory developed here. Results indicate that caterpillar drives (a) have potential due to their ability to maintain efficiency after significant internal friction losses and (b) may be more efficient than propellers in non-ideal speeds.
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