In heavy seas, especially in conjunction with high ship speeds, due to the heave and pitch motions of the ship, the bow can come out of the water. When re-immersing and exceeding a critical relative vertical velocity at the hull surface, enormous pressures and forces can occur which can cause damage to the ship due to these impacts.
To investigate this problem experimentally, a hydraulic slamming system was developed in the SVA. With this system, pitching, heaving and coupled movements can be introduced with a frequency of up to 2.0 Hz and an amplitude of up to 10 cm on model ships. It can test models with a length of 5.5 m and a moving mass of 500 kg. By measuring pressure variations in the kHz range on up to 30 measurement points, local peak pressures can be identified.
Technical Specifications |
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| Max. Frequency | 2 Hz |
| Max. Amplitude | 0.1 m |
| Max. Model Length | 5.5 m |
| Max. Mass | 500 kg |
| Max. # Measurement Points | 30 |
Context Related References / Research Projects
[1] Fröhlich, M.: Einsatz eines Schwingungsoszillators auf hydraulischer Basis zur Untersuchung der Slammingbelastung von Schiffen, STG-Sprechtag „Schiffe im Seegang“, Hamburg, Oktober 1998