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Experiences with Seakeeping Capabilities of SES Ships
| 题名： | Experiences with Seakeeping Capabilities of SES Ships |
| 作者： | Steen, Sverre; |
| 关键词： | SEAKEEPING, SURFACE EFFECT SHIPS, INJECTION, STABILITY, AIR PRESSURE, AIR RESISTANCE, CATAMARANS, WATER JETS, SYMPOSIA, NORWAY, DESIGN CRITERIA |
| 摘要： | SES ships are known to have more favourable motions in high sea states than for instance catamarans. On the other hand, pressure variations in the air cushion might induce high levels of high-frequency accelerations in lower sea states, where other ships have no problems at all. Leakage of air from the air cushion due to relative motions between the ship and the sea leads to loss of pressure, increased resistance and lower air gap between the large horizontal wet deck and the sea. The resistance increase due to waves is usually much larger for a SES than for other ships. This is a problem if the ship has to keep a tight schedule. Slamming against the unusually large wet deck is another potential problem that has to be taken seriously by the designers. Due to the low draught, and due to the presence of the air cushion, air injection to the waterjets is a problem that needs to be taken seriously. Air injection to the waterjets leads to loss of thrust, and often sudden, sharp drops in shaft torque, which might lead to breakdowns of gears and engines. This paper discusses the problems and benefits of the SES concept with respect to seakeeping. References are made to the model testing and full-scale tests of the FPB KNM Skjold, which is in service with the Norwegian Navy. References are also made to other SES development projects where MARINTEK has been involved. The paper emphasizes guidance with respect to design for good seakeeping capabilities. Other aspects of SES design are more briefly discussed. |
| 总页数： | 12 |
| 报告类型： | 科技报告 |
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