20 Nov 2014 Berry van Drie receives an award for his work on: “Smart Combinator designs”.
The award was given by the Royal Netherlands Society of Naval Architects (KNVTS) event in Rotterdam.

Photo (L-R):
Arie de Groot (De Ruyter Academy), Willem Laros (Ceremony Chairman KNVTS / Damen Shipyards), Berry van Drie (Student De Ruyter), Leo de Vries (Ketelbink / Wärtsilä)

Berry has received the degree of Maritime Officer at De Ruyter Academy in Vlissingen in July 2014.
For his final thesis he did his research work at Wärtsilä related to propulsion systems related to controllable pitch propellers and 4-stroke diesel engines.

In order to operate the propulsion train of a ship, the engine lever setting and propeller pitch are to be adjusted for each type of operating condition.
The combination of lever setting and propeller pitch over the speed range are called combinator curves.
In order to design a combinator mode, the ships’ resistance, environmental conditions and operator demands are to be taken into account, securing sufficient safety margins to protect the engine from overload and to avoid wear and tear due to oscillations.
The constraints that are to be taken into account are related to the speed engine torque limit, waste gate, propeller cavitation, avoidance of wind-milling and several more.
Besides the combinator mode, a good dimensioning and sizing of the engine, transmission and propeller are of equal importance.

Due to the multi-disciplinary expertises involved (engines, propellers, ship operating conditions and controls), Wärtsilä was interested in an integrated approach in order to be able to effectively design combinators for lowest fuel consumption.

Berry has collected all relevant criteria and made a structured design approach for defining the most efficient combinator lies for a drive-train design.
In order to get a better understanding of the sea-margin added resistance and a simplified wave oscillation model have been applied.
He exploited a ship performance prediction model with route simulation to compare a reference design of a general cargo ship with his integrated approach.
Here he introduced 12 different combinator lines to accommodate all operating conditions, including ice loads.
Significant improvements in terms of fuel saving were shown, while maintaining good safety margins to protect the equipment.

Berry has shown to be able to collect and structure all information, as well as acquire the knowledge in order to deliver a working solution within the given time.

We wish Berry all the best with his future challenges and career.

Berry van Drie receives Maritime Student of the Year Award at the KNVTS Ceremony 2014