著者

羽田野 袈裟義 種浦 圭輔 渡邉 誠 中野 公彦 斉藤 俊 松浦 正己

出版者

公益社団法人 土木学会

雑誌

土木学会論文集B (ISSN:18806031)

巻号頁・発行日

vol.62, no.3, pp.270-283, 2006 (Released:2006-08-18)

参考文献数

27

被引用文献数

3 4

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プーリ・ワイヤ・フロート・カウンタウェイト・ラチェット機構を組み合わせたつるべ式構成の波力エネルギー変換システムの力学モデルを提示している.計算では,フロートの喫水状態を時々刻々調べ,フロートの一部没水,全没水及び宙吊りに応じて計算式を使い分けている.また,水槽実験により力学モデルの検証を行い,フロートがローリングを起こさない場合にはエネルギー利得の実験と計算が良好に一致することを確認した.次いで,実稼動を想定して諸量の計算を行い,フロートの喫水状態により発電量,ワイヤ張力などの力学量の時系列変化に違いが出ることを明らかにすると共に,種々の波高と周期の組合せに対してエネルギー利得の評価を試みている.

著者

尾崎 雅彦 南浦 純一 太田 真 佐々木 裕一 松浦 正己

出版者

公益社団法人日本船舶海洋工学会

雑誌

日本船舶海洋工学会論文集 (ISSN:18803717)

巻号頁・発行日

no.3, pp.87-95, 2006-06

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Ocean storage of the captured CO_2 from fossil-fuel burning is a possible option for mitigating the increase of CO_2 concentration in the atmosphere. Moving-ship type of CO_2 ocean storage is a concept whereby captured and liquefied CO_2 is delivered by ship to a site and injected into the deep ocean by means of a pipe suspended beneath a ship as it slowly moves through the water. In case of bad weather conditions, CO_2 marine transport and operation on the sea should be adjourned although CO_2 would be captured at the plant every day. It is, therefore, required that the system would have the buffer storage at the port and the extra shipping ability to recover the delay of schedule. Since the large scale of such spare capability might lead to the increase in cost, it is needed to investigate how to plan the system allowed for weather conditions reasonably. In this study, a time series model of sea state through one year is generated for a hypothetical ocean storage site, based on the wind data observed with satellite remote sensing, and simulations of CO_2 marine transport and operation on the sea are carried out considering the operational limit of sea state. In this approach, the continuing bad weather days or the frequent occurrences of rough sea condition during the specific season are counted automatically. In order to pursue higher efficiency of the operation, side-by-side type and tandem type of moorings are applied for the simulations and compared. Finally, cost assessments under the several assumptions are carried out to see the relative merits among that the number of ships would be increased, that the loading capacity of a ship would be increased, and that the storage capacity at the port would grow, which are generally in trade-off relationships.