EXPERIMENTAL INVESTIGATION INTO SOME ASPECTS OF LARGE VESSEL NAVIGATION IN RESTRICTED WATERWAYS
In response to the increasing demand for more accurate design and operational criteria for large vessel navigation in inland waterways, a general study program was initiated at the Hydraulics Research Centre of the Canadian Coast Guard. The program emphasizes particularly the situation where the waterway is not confined in width but it is limited in depth. Three self propelled VLCC models, the largest of 227,000 DWT, were used in laboratory tests on mainly two aspects--the squat and the stopping distance as a function of speed, draft, water depth, etc. Successive overhead TV cameras were used in tracking and recording horizontal motions of the tested vessels. The vertical displacements were measured by means of a system consisting of a horizontally fanned laser beam as a fixed reference datum and two mini TV cameras mounted on the bow and stern of the vessel. With this system, the image of the laser beam on graduated scales is picked up by the mini TV cameras and transmitted to video tape recorders in a control room where the data synchronization, recording, and processing is done. From the experimental squat data, families of empirical curves are developed giving relationships between squat, speed, and draft. Crash stop astern tests showed that the time it takes for a vessel to come to full stop, the total stopping distance, as well as its advance and transfer depend primarily on the speed of the vessel just before astern order is given. Crash stop astern tests and squat tests with trim, and with and against currents have not been concluded but are part of the program. Order from BSRA as No. 54,237.
- Symposium Proceedings on Aspects of Navigability of Constraint Waterways, including Harbour Entrances, held Delft, Netherlands, April 24-27, 1978.
- Eryuzlu, N E
- Hausser, R
- Publication Date: 1978
- Features: References;
- Pagination: 15 p.
- Volume: 2
- Issue Number: 9
- TRT Terms: Braking; Maneuverability; Maneuvering; Ship motion; Stopping; Very large crude carriers
- Uncontrolled Terms: Squat
- Old TRIS Terms: Crash stop maneuver; Model testing; Restricted water operation; Shallow water maneuvering
- Subject Areas: Marine Transportation; Vehicles and Equipment;
- Accession Number: 00323282
- Record Type: Publication
- Source Agency: British Ship Research Association
- Files: TRIS
- Created Date: Mar 12 1981 12:00AM