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Koichi Hirata

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Featured researches published by Koichi Hirata.

Marine engineering | 2005

Basic Study of Advanced Sail-assisted Ships

Michio Ueno; Toshifumi Fujiwara; Masaru Tsujimoto; Fumitoshi Kitamura; Yoshimasa Minami; Tadashi Nimura; Koichi Hirata; Hideki Miyazaki

Investigation in wind tunnel tests of the aerodynamic characteristics of a hybrid sail, consisting of a slat, a hard sail, and a soft sail was combined with experimental clarification of the interactive effects of plural hybrid sails on deck. We measured the hydrodynamic characteristics of underwater fins for advanced sail-assisted ships in tank tests, and analyzed their effectiveness on steady sailing performance, as well as investigating through wind tests the aerodynamic characteristics of a new hybrid sail that utilizes a deck crane as its boom. The weather routing system we developed for advanced sail-assisted ships showed in calculations for a North Pacific Ocean route that an advanced sail-assisted bulk carrier can cut emission of carbon dioxide by a total of 17.4 percent on the average, compared with a conventional bulk carrier.

Marine engineering | 2006

Development of Turtle-like Submersible Vehicle

Akihisa Konno; Takuro Furuya; Akisato Mizuno; Kazuhisa Hishinuma; Koichi Hirata; Masakuni Kawada

The Thirteenth International Offshore and Polar Engineering Conference | 2003

On Aerodynamic Characteristics of a Hybrid-Sail with Square Soft Sail

Toshifumi Fujiwara; Koichi Hirata; Michio Ueno; Tadashi Nimura

Journal of The Japan Institute of Marine Engineering | 2012

COMPARISON OF THE NOx REDUCTION PERFORMANCE OF SCR INSTALLED ON DIESEL ENGINE AND THE ESTIMATED PERFORMANCE FROM CATALYST TEST USING MICRO-REACTORS

Yoichi Niki; Koichi Hirata; Takeyuki Kishi; Yasuhisa Ichikawa; Shota Ohashi

Journal of The Japan Institute of Marine Engineering | 2018

Multi-zone Diesel Combustion Model for Prediction of Combustion in Lean Mixture of Gaseous Fuel

Yoichi Niki; Yoshifuru Nitta; Sumito Nishio; Koichi Hirata

Journal of The Japan Institute of Marine Engineering | 2018

Effects of the Combustion Characteristics of Diesel Engine by the Intake of Exhaust Gas from Gas Engine

Yoshifuru Nitta; Yoichi Niki; Koichi Hirata; Yudai Yamasaki

Journal of The Japan Institute of Marine Engineering | 2017

Development of Ship Energy-saving System through Simultaneous Control of Shaft Speed and CP Propellers’ Blade Angles

Masaki Fukazawa; Takashi Odagiri; Junichi Suzuki; Hironori Susaki; Naoya Umeda; Hidenori Makino; Yuichiro Hirano; Katsuji Tanizawa; Koichi Hirata; Hidenori Sekiguchi; Bondarenko Oleksiy; Yasushi Kitagawa; Koichiro Shiraishi

Journal of Engineering for Gas Turbines and Power-transactions of The Asme | 2017

Evaluation of Emissions Characteristics of Marine Diesel Engine Intake of Exhaust Gas of Lean Burn Gas Engine

Yoshifuru Nitta; Dong-Hoon Yoo; Sumito Nishio; Yasuhisa Ichikawa; Koichi Hirata; Yudai Yamasaki

Marine engineering | 2013

Research on Certification of SCR System for Marine Diesel Engines

Koichi Hirata; Takeyuki Kishi; Yoichi Niki

The Proceedings of the Symposium on Stirlling Cycle | 2012

A06 Concept Design of Cold Energy Used Stirling Engine for LNG Fueled Ship

Koichi Hirata; Dong-Hoon Yoo

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Tadashi Nimura

Ontario Ministry of Transportation

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Dong-Hoon Yoo

Kobe University

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Yudai Yamasaki

University of Tokyo

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Chiori Takahashi

Ontario Ministry of Transportation

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Katsuji Tanizawa

Ontario Ministry of Transportation

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Michio Ueno

Ontario Ministry of Transportation

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Akihisa Konno

Kogakuin University

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Akisato Mizuno

Kogakuin University

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Bondarenko Oleksiy

Osaka University

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Kazuhisa Hishinuma

Kogakuin University

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