As well as the computer calculations and model trials, MARIN remains involved after a vessel or the structure has been built.
When clients want to know how a vessel or a structure behaves at sea, we measure on board its speed and engine power or the towing capacity of a tugboat. Inspections and measurements are also carried out at sea on speed, vibration or structure of a vessel. We analyse and validate the measurement data on various types of vessels and platforms. Such a trial on a new vessel takes 2 to 5 days and can be done anywhere worldwide.
Cavitation of a ship’s propeller can result in loss of speed, vibration of the ship’s hull, and erosion of the propeller blades. MARIN carries out cavitation inspections on broad with the aid of a boroscope. The ship’s hull is inspected by means of a hole bored in it for the boroscope, which has mirrors and lenses to enable detailed inspections. Special light intensification (it’s very dark under a ship) enables videos it be made.
We use automatic measurement systems to carry out continuous measurement on board ships. These measurements are done mainly for the motion and load/stress on a ship or its cargo. The effects of storm conditions are included in long-term measurements. For instance, we measure the lashing forces on containers in relation to ship motion.
Our clients for this type of measurement are very diverse. When clients have similar interests, joint studies can be done and the costs shared. Joint Industry Projects are set up. Several such projects are ongoing simultaneously. For example, we have joint research on underwater noise caused by cavitation, and the impact of waves on offshore structures. This is a great way to share knowledge.
Did you know
our measurement engineers are on board during sea trials of special ships, such as a submarine?