著者
棚橋 晃毅 安里 勝雄 宮坂 武志 渡辺 裕太
出版者
一般社団法人日本機械学会
雑誌
熱工学コンファレンス講演論文集
巻号頁・発行日
vol.2011, pp.321-322, 2011-10-28

The effects of blockage ratios (BR) of the Shchelkin spiral on characteristics of deflagration-to-detonation transition (DDT) in a vortex flow were examined in order to control the DDT distance without losing the simplicity inherent pulse detonation engines. The DDT distance decreases with increasing the BR of the Shchelkin spiral. However, the optimum value of BR exists. The DDT distance is deteriorated if the BR exceeds the optimum value. Optimizing the BR of the Shchelkin spiral is another way to shorten DDT distance in a vortex flow.
著者
渡辺 裕太 安里 勝雄 宮坂 武志 石川 聡真 棚橋 晃毅
出版者
一般社団法人日本機械学会
雑誌
熱工学コンファレンス講演論文集
巻号頁・発行日
vol.2010, pp.131-132, 2010-10-29

The effects of lengths and blockage ratios (BR) of Shchelkin spiral on characteristics of deflagration-to-detonation transition (DDT) in a vortex flow were examined in order to control the DDT distance without losing the simplicity inherent pulse detonation engines (PDEs). A vortex flow field was established in the ignition and transition domains of the detonation tube using a vortex flow type injection. The DDT process was observed by measuring the pressure and ionization current in the detonation tube. The DDT distance decreases with increasing the length of Shchelkin spiral. However, the optimum length of Shchelkin spiral exists. The DDT distance is reduced by about 12.0% when the BR is increased from 38.2% to 45.1%.
著者
渡辺 裕太 関口 芳廣 西崎 博光
出版者
一般社団法人情報処理学会
雑誌
情報処理学会論文誌 (ISSN:18827764)
巻号頁・発行日
vol.47, no.6, pp.1812-1821, 2006-06-15
参考文献数
11

この論文では,数人と対話ができる音声対話機能を備えた音色識別学習支援システムについて述べている.この論文では,特に,音色の例として人間の声を扱っている.まず,最初に音色識別学習支援システムに必要な機能を被験者実験により調査した.その結果,(1) 音声対話機能が必要である,(2) 1 人よりも2 人で学習すると学習効果が高い,(3) 聴覚情報だけでなく,視覚情報も有効である,という3 つのことが分かった.そこで,前述の機能を備え,複数人で使用できる音色識別学習支援システムを作成した.被験者実験により,学習支援システムを使って音色識別学習をした場合の方が,システムを使用しないで音色識別学習をした場合より音色識別精度が50%改善している.This paper describes a tone color identification learning support system with speech dialogue function that can have a conversation with a few person. In this paper, we especially deal with speech as an example of tone color. First of all, we have investigated functions which are required for the tone color identification learning support system by doing subject experiments. The results showed as follows: (1) a speech dialogue module are needed, (2) training in a twosome gets higher learning effect than training alone, (3) visual information such as spectrograph is useful for training as well as acoustic information. We constructed the support system, therefore, which can be used by a few person and has the functions described above. The experimental result of tone identification by subjects who used the support system showed that the performance of identification achived improvement of 50% accuracy comparing with the case in which the system was not used.