Abstract
A very large vessel must be brought into contact with the jetty with a speed low enough to ensure that no damage is caused to the vessel or the jetty structure. Generally speaking, the maximum allowable speed is 15 cm/s, and the approach angle is six degrees from parallel. A measuring instrument, using underwater echo ranging technique, has been developed as an aid for use by ship's master and berthing pilot. Its function is to assist them to secure safety in the berthing operation of large vessels by accurate measurement of bow and stern approach velocities and distance-off. The transducer, fixed on the dolphine pile, has two 100 kHz PZT disks so as to gain ±15° horizontal directivity, and its position is about 3 m deep. The measure range of the instrument is over 200 m and the speed resolution is ±1 cm/s. Docking records show that the range of the contact speed is 3–5 cm/s, and the angle is 5°–6° with the bow touching the dolphine earlier than the stern.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
