Marginal Column

Waves on demand

Content

November 2017

 

For centuries building new ships depended on experience only. The rise of hydrodynamic research delivers precise knowledge for reliable, safe and economical solutions. Bosch Rexroth supports this research since 27 years.

With decades of experience, Bosch Rexroth supplies wave ge­nerator systems to universities and research laboratories worldwide to serve scientific research on models of ships, offshore constructions, artificial isles, harbor designs, erosion on dunes and stability of dikes. Validation of designs are important for investments in offshore applications. Several types of wave generators are realized for deep- or shallow water applications with different principles of wave generation — as you can see in the following milestones of Rexroth projects.

1991

1991

Mannesmann Rexroth receives a special request from ThyssenKrupp: Whether it is possible to apply a wave generator for Indonesia? The development of the hydraulic servo drives gives the opportunity to generate waves with a position controlled system, first with analogue electronics. In total more than 200 drives working together in one system. After successful supply, the next request from the market follows automatically. The division “Hydrodynamic research” is founded.


 
1997

1997

Turn from hydraulic drive to an electrically driven wave generator. Today’s digital systems have high accuracy and repeatability, compared to the old analog systems that always required adjustments and calibrations.


2000

2000

The “active reflection compensation” (ARC) was developed. When waves hit the wall of the testing basin or a model, a part of the wave energy will reflect and disturb the succeeding waves. These reflecting waves can be compensated by ARC: an extension of the control system that measures on each waveflap the waterheight and compensate the position of the wave flap for the required waterheight.


 

Now and in the future

Several Customers from all over the world are working with wave generators made by Bosch Rexroth. With regularly new contacts, the division is still expanding. Until now, computers cannot simulate the behavior of a ship or offshore construction exactly and therefore models are still need to be tested in basins. With a growing market for efficient and alternative propulsion systems for ships, offshore exploration of oil and gas, but also minerals in very deep water, changing world climate and study on renewable energy sources, research is more important than ever. Accurate research in basins with a reproduction of the scaled environmental conditions, is the best way for making predictions on the behavior in real world.