System design as a decisive step in engineering naval capability

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Environment-friendly inland shipping

Environment-friendly inland shipping-2

Uncertainties and Margins in the Ship Propulsion System Design Process

An important aspect for a new-built vessel is the contract speed. Not reaching the contract speed can lead to penalties for the shipbuilder and dissatisfaction for the customer, while an under-predicted contract speed can lead to non-competitive design and a lower income for the shipbuilder. The performance of a new-built vessel is uncertain due...

System design as a decisive step in engineering naval capability

Both costs and capability of naval ships are mainly determined in the early phases of design. The increasing power of computers and sophistication of simulation packages offers the challenge to create more different system designs in an early stage of ship design with a higher level of engineering detail, as well as the challenge to develop...

Control of hybrid ship drive systems

Stricter regulations on emissions force ship owners and designers to come up with new solutions for ship propulsion systems. Hybrid drive systems consisting of prime movers and batteries, like in the Toyota Prius, show great potential, especially in special ships like harbour tugs. Economic and environmental performance of such systems strongly...

Application of Dynamic Models During Design of a Hybrid Diesel-Fuelled PEMFC^ System With Fuel Reformer

The use of simulation models in education: the affordable engineer

Application of dynamic models during design of a hybrid diesel-fuelled PEMFC system with fuel reformer

Design of a hybrid diesel-fuelled PEMFC system for application onboard naval ships is challenging for mul-tiple reasons. The fact that new technologies are used is only one of them. Less obvious, but also very challeng-ing is for instance choosing the ratio between installed battery capacity and fuel cell power. This ratio is a typi-cal design...

Environment-Friendly Inland Shipping Dynamic modeling of propulsion systems for inland ships using different fuels and fuel cells

Environment-friendly inland shipping: Dynamic modeling of propulsion systems for inland ships using different fuels and fuel cells

To meet possible future emission regulations for inland ships alternative propulsion systems with fuel cell technology and batteries are researched. A rather simple, yet efficient dynamic model is being developed to simulate four different propulsion system configurations with different fuel cells and different fuels. The system configurations...

Time-Dependent Polynomial Chaos

A mean value first principle approach for dynamically modelling reactors and heat exchangers within a dieselfuelled PEMFC system

Time-Dependent Polynomial Chaos

Generalized polynomial chaos is known to fail for long-term integration, loosing its optimal convergence behavior and developing unacceptable error-levels. In this work, we present a time-dependent alternative of polynomial chaos in order to overcome these issues. This technique exists out of an on-the-fly reinitialization of the polynomial...

Aerobic Denitrification in Various Heterotrophic Nitrifiers

Micro-elektronica voor onze toekomst: Een kritische beschouwing

Uitgave van de Stichting Toekomstbeeld der Techniek.

Pneumatic barriers to reduce salt intrusion through locks

Extensive areas in the low-lying parts of the Netherlands are below average sea level. They are divided up into polders in which the water levels are controlled by pumping. The water that seeps upwards in the soil together with surplus rain water is pumped into canals encirc1ing the polders; the canals are linked and serve as collectors, the...