Technical summary

The solution is based on open tanks to sea, stretching above water baseline, utilizing over and under pressure to work counter phased towards waves.

The innovative solution provides significantly increased speed during water level adjustment inside tanks.

Due to its design, the system is energy efficient.

Patent

The solution is patented in USA, Russia. Brazil, China, India, Korea and Norway.

The patent is pending in other areas and countries.

Patent overview:

USA: 8,479,674 – Accepted

Norway: 20076308 – Accepted

Russia: 2010122729 – Accepted

Brazil: 0821169-8 – Accepted

China: 200880123976.0 – Accepted

India: 2035/KOLNP2010 – Accepted

Korea: 10-2010-7014925 – Accepted

EPO: 08858077.4. – Accepted

Products and functions

The solution is available in four products:

  • Variable vessel buoyancy
  • Anti–heeling system
  • Passive stabilization
  • Active stabilization

Verification of passive and active stabilization mode

Simulation models at Ålesund University College have verified the solution. Calculations concluded a theoretical damping potential of 96%.

Further, a ship model trial, with weight displacement at 15.150 t, was performed at Stadt Towing Tank. The trial included testing of roll and pitch, both active and controlled passive.

The damping effect results are stated below.

Active Roll: 79.8%

Active Pitch: 44.4%

Controlled passive damping has shown effect up to 36.9%

Roll response

Controlled passive damping has shown effect up to 36.9%

Technical description

The solution is based on open ballast tanks to sea in vertical direction, stretching over the sea water level, utilizing negative and positive pressure to work counter- phased towards waves.

High volume air compressors, working with low pressure and vacuum, manage volume in designated tanks. The active stabilization controller provides optimal filling in these tanks based on input from the ship´s movements.

Functional description

The center level and volume in the tanks are at the variation sea water level. This is to enable the system to “catch” the waves and work with nature´s forces.

“Catching” the waves makes the filling process of the tanks possible without any power consumption. If more filling or load in the tanks is needed, this is added through the suction side of the compressors.

The compressors, working at high volume of air, but with low pressure and vacuum, require low power consumption.

Application

All vessels and floating units focusing on keeping movement to a minimum will benefit from our stabilization system and solutions. They will increase operation time and reduce down time caused by weather/environmental conditions.

The solution can be implemented in all new constructions, and in most cases in existing ships.

Model verification

During a model test at Stadt Towing Tank, using a Ramform model vessel as a test bed for the system, all simulation models were verified. The model was fitted with transparent ballast tanks, valves and sensors necessary to implement the control system. Marine Innovation did the implementation of the control system.

The model test conclusion stated that the stabilization principle reduces roll and pitch values significantly.

The reduction depends on available volume in ballast tanks. Highest reduction is obtained with the active system by using positive and negative pressure to control ballast tank filling.

The passive system has also been proved to reduce the movements of the vessel significantly.