| Prediction and Verification of Water-entry Traces Size of Small Falling Objects into the Sea |
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Anki Min, Tae-Won Hwang |
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The 1st Research and Development Institute, Agency for Defense Development |
| 해상 소형 낙하물 입수흔적의 크기 예측 및 검증 |
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민안기, 황태원 |
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국방과학연구소 제1기술연구본부 |
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| Abstract |
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An unmanned aerial photography method by using an unmanned helicopter is useful method for measuring of the water-entry traces of small falling objects into the sea. Pixel sizes on the aerial photograph may be too large due to a limit of camcorder resolution and a wide shooting area. If the pixel size is too large, identification of water-entry trace is impossible. Thus an accurate prediction of water-entry trace size is required. The traces of water-entry could be classified into three types such as splash, water column, and bubble. Diameters of each trace are predicted by water-entry impact pressure theories, cavity theories, and trial test results. The results are verified by drop tests using an unmanned helicopter at two water-entry speeds. As a result, prediction and test results showed sufficient similarity to evaluate the identifiability of water-entry trace. |
| Key Words:
Traces of Water-entry, Unmanned Aerial Photography, Small Falling Object |
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