Ship Dynamics

The following text reduces the meaning of "dynamic behaviour" to the vertical movements of the ship (squat and trim) with the effects in terms of vessel size, ship speed and bed structures.

Squat refers to the way the moving ship is lowered in the primary wave system generated by the ship itself. Trim is the way the ship turns around the pitch axis and is influenced among others by certain ship parameters and the ship speed. The purpose of the studies is to provide the WSV with the squat and trim parameters related to speed, water level and draught for determining the fairway depths for pending upgrading projects. The model studies are divided into three sub-projects:

1. Determining squat and trim together with ship-induced pressure and wave systems when travelling over a firm, level bed in laterally unrestricted shallow water
2. Determining squat and trim together with ship-induced pressure and wave systems when travelling over a firm bed with dunes in laterally unrestricted shallow water
3. Systematic studies for determining squat and trim together with ship-induced pressure and wave systems when passing through channels in laterally restricted shallow water.

Selected results of the extensive test series are presented under the above numbers. Picture 1 gives and impression of the test facility and the size of the model ships.

The results of the studies under 1 and 2 were published in March 2001 (Uliczka/Flügge, 2001) and in September and December 2001 (Flügge/Uliczka, 2001). Results of the studies under 3 were published in January 2004 (Uliczka/Kondziella/Flügge, 2004) and in 2006 (Uliczka/ Kondziella, 2006).