| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce a depth change in an underwater acoustic sensor even in a rapid tidal current state.SOLUTION: An underwater damper 13 is used under an environment having a tidal current, and is constituted of a freely foldable sheet-like body 20, and the body 20 is divided into at least two sections, and the first section 28 is provided with a relief hole 21 for opening a part of the body 20, and the second section 29 is positioned around the first section 28, and the body 20 is folded up so that the second section 29 covers the relief hole 21 of the first section 28, and a folding-up state 27 is formed, and the folding-up state changes in response to a speed of the tidal current, and is put in a first arrangement mode, and when the speed of the tidal current is less than a pre-assumption state, the second section 29 intercepts the tidal current of flowing in the relief hole 21 of the first section 28, and is put in a second arrangement mode, and when the speed is the pre-assumption speed or more, the tidal current is released from the relief hole 21 of the first section 28.</p> |
