STUDIO WTB
ENGINEERING AND CLEANING MACHINERY

Een roeier bezig met afmeren van een schip aan de kade in de haven. Vuistdikke trossen.

File, CO2 uitstoot, uitlaatgassen. Wel het verkeer verminderen maar niet de mobiliteit. Met slimme oplossingen. Een veerboot die afmeert met draaiende motoren. De schroeven duwen de boot tegen de kade. Scheepsdiesel, in dit geval bio-diesel, wordt per tankwagen aagevoerd. permanent magnetisme voor toepassing in de industrie. Mogelijk ook voor veerboten.

een veerboot meert af, de pont mederwerker gooit een kabel om een bolder

Dutch

Patent on
"Magnetic mooring"

Illustrations

 

engineering

Magnetic mooring is an example of engineering. Although specialized in machinery for industrial cleaning Studio WTB has takes also initiatives on other terrains like nautical equipment.

 

mooring

Many saw a ship moored to thick mooring ropes, without realizing that mooring with mooring ropes can be time-consuming and dangerous. However, this method is applied from way back: quays stand full with bollards. But, there are so many inventors among us people? That's  correct: there are installations and machines for mooring invented. But a really useful and economic opening has not yet been reached. In some cases, as an escape, during mooring no fixed connection between ship and quay is made anymore. Ferry boats, which frequently lie a short period, do this. The captain positions the ship carefully against the quay and keeps thrust on the propellers. But, a failure in the propeller drive system can never be 100% excluded. In such situation the ship can float to lower rampart. As a result, the reliability of the method of trusted mooring is stipulated by the reliability of the engine and control systems.

 

backwash

Propulsion becomes visible by backwash: bubbles on top of the water. Under the ship water circulates, influencing the port basin floor. Where this material falls down a threshold is formed. Where material is taken away quay structures may become undermined. This results in additional port structure inspection and maintenance.
Another aspect: making backwash and therefore loose mooring requires much energy. Imagine: a simple, automatic and safe way of mooring comes also available for these situations. Backwash during mooring becomes superfluous. The ship�s engines may remain stationary. 

Savings indication: 908,000 liters diesel per year at 1 ship only. Fiction? Certainly not, the subject of calculation is an existing Dutch ferry boat. Any ferry boat forms a part of the infrastructure and is an economic factor. Mobility is fine but has nasty impact as well : emission, smog , noise. Banish movements from where we live and recreate, wishes occupants. If redirection of traffic succeeds on the place of this ferry the solution seems only half: This boat uses during loose mooring certainly as much fuel as all its transit traffic.


Backwash during mooring synonyms: poor atmosphere. expense. maintenance.  Yet a good mainspring for new developments
.

 

concept

Taking in mind the huge amount of energy required for making serious backwash (this basically generated the idea) loose mooring has been reflected. We examined and reviewed the existing installations and crawled through patent documents. With as result that an original, durable, safe and new concept can be added. Based on permanent magnets. This type of magnets is not yet used for mooring although these magnets are common practice in industrial lifting equipment. These compact units contain several very strong magnets. The magnet poles inside the unit are movable. This makes on/off changing of the magnetic attraction of the module possible. A single unit is capable to attract 7000 kg . This is 56 times its own weight.

 

Klik hier voor een voorbeeld van een afmeersysteem

 

in practice

An example for calculating. Wind strength 12Bft. Stormy weather, the wind hits to boat with maximum perpendicular force. The ship has taken position in the bow net or with the bow connected to a dedicated �bow magnetic mooring installation�. The most important magnet installation has been positioned halfway starboard. This mooring installation can move in all axles. It follows tidal movements and movements of the ship. The 18 magnet units generate a holding force of 126 tons. In our consideration this proves to offer enough security for wind strength 12. As a matter of fact, in such rough conditions an additional mooring scenario will be run anyway, just for safety. For visualization we made a 3D model of a ferry boat and a part of an magnetic mooring installation on the next page.

 

future

The ferry boat arrives at the quay. Passengers see how the ship manoeuvres itself towards the bow net structure. The magnet beam with it's heads remains safely within the structure of the bow net, but as soon as the ship reaches the right position the beam with magnets gets transferred to the ship and will attach automatically. The ship is then pulled against the structure of the bow net. The connection remains elastic by the large hydraulic element.  The whole procedure goes automatically.

The ships propulsion may now run stationary. Note: permanent magnetism needs no electric energy for maintaining the magnetic strength field. This in contrast to electromagnetism. The ship lies because of this intrinsically or redundant safely moored.  Disconnecting goes simply: a drive unit on top of each unit changes the poles of the magnets. The outgoing magnetic field from the heads is relieved. Time for the next departure!

 

summary

# Mooring with backwash (with running propulsion) causes port erosion
# It raises the costs of quay- and port maintenance
# Loose mooring leads to extended maintenance to the ship
# Permanent lifting magnets are proved technology
# Lifting magnets work without electric power and are intrinsically safe
# Magnetic mooring offers direct savings:
# In our calculation an existing ferry saves annually:
   908,000 litres diesel
   2,400,000 kilogram�s CO2 expel

 
 

 

 

example installation (3d model)


 
 

relevant internet links

magnetism


octrooidatabase


klimaatconferentie kopenhagen, slottekst

maritime injuiries

tragic mooring accident

 
 

 

disclaimer
#Calculations which underpin this concept have been based on an existing situation and on supplied data by the shipping company. The shown images serve for the illustration of the concept and reflect a random ferry boat which is representative for other ferry boats.
# The shown elaboration is for the illustration of an application with the connection principle of permanent magnets. Another elaboration, such as integration in embankments is possible. These are added soon to this site.
# Copyright studio WTB. These images cannot be copied without our written authorisation or to be used elsewhere. Take contact with Studio WTB for use of technology or detail information: engineering@studiowtb.com.

 

 
 

TAGS

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