2023 Fiscal Year Final Research Report
Novel Principle Sound Device based on High-Speed Response Method of SMA Wire for Random Frequency Input
| Project/Area Number |
20K04340
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 20010:Mechanics and mechatronics-related
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
田島 悠介 北海道科学大学, 工学部, 助教 (00849375)
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| Project Period (FY) |
2020-04-01 – 2024-03-31
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| Keywords | 形状記憶合金 / Shape memory alloy / SMA / アクチュエータ / 音響計測 / 強化学習 |
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| Outline of Final Research Achievements |
An experimental investigation was conducted to examine sound generation by driving a shape memory alloy (SMA) wire, which has conventionally been considered difficult to drive at high speeds in the audio frequency range by maintaining the wire under the most responsive conditions. It was demonstrated that stable driving was possible at frequencies up to 7 kHz by applying a constant power bias to the AC signal at the desired frequency through power control. Furthermore, the characteristics of the volume generated at each frequency were clarified. Additionally, the structure of the voice device was investigated, a method for adjusting the output for inputs containing random frequencies was explored, and the optimization of input waveforms using deep learning was examined.
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| Free Research Field |
ロボティクス・メカトロニクス
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| Academic Significance and Societal Importance of the Research Achievements |
急速なAIの発展により，スマートフォンなどの通信デバイスとのコミュケーション手段として，音声の重要性が増している．そのような背景の中，本研究は新しい形式の音源の提案を行った．従来，高速に駆動させるのが難しいとされ，音源としては用いられてこなかったSMAアクチュエータを音声周波数帯域で高速駆動させる方法を開発し，音の生成が可能であることを示した． SMAアクチュエータは柔軟で細いワイヤであることから，装置の小型化や軽量化など，デバイス設計により大きな自由度を与える可能性がある．本研究をさらに発展させることで，ウェアラブル機器や医療・福祉機器への応用が期待できる．
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