Shipbuilding trends in response to environmental issues

This paper offers an overview about how societal issues and environmental challenges will influence shipbuilding in the near future. It begins with an evaluation of societal developments and refers to globalization and climate change. The paper then continues to assess the impact of these developments on ship design and operation, and considers how the adverse effects of shipping in this context can be reduced. In this respect, topics like emission control and scrapping of ships are considered.     

Nonlinearity-induced time-varying harmonic dynamic axle load and its impact on dynamic stability of car–trailer combinations

A nonlinearity-induced time-varying harmonic dynamic axle load is found in the road test of a car–trailer combination. To understand its influence on system dynamic stability, a corresponding linear single-track model (STM) is proposed. System dynamic stability is described and sensitivity analysis for the system parameters is achieved. The contribution of the harmonic force is quantified by a derived effective axle load. Because the harmonic effect might be time varying in practice, a time–frequency analysis-based parameter identification method is introduced. Experimental study shows that a time-varying harmonic effect really exists. A yaw-rate-based simulation method is designed to simulate this behaviour. The sensitivity analysis of the influence of the harmonic amplitude or phase on dynamic stability is performed with a simulation study. With appropriate modification of the harmonic amplitude and phase shift applied in selected time windows, the time-varying system characteristics in the road test can be simulated very well.     

德国劳氏:船舶效率决定船舶的竞争力

汉堡/上海,2009年12月2日-德国劳氏(GL)认为,船舶效率是提高船舶竞争力、降低营运成本和减少排放的关键.德国劳氏一直是船舶效率的倡导者.     

Quality shipping — incentives,disincentives

Shipping is the indispensable means of distributing goods between places of production and areas of consumption on our globe and is often claimed to be the most environmentally friendly mode of transport. However, there is a distinguished backwardness of shipping technology in environmental terms due to the hard competition within the globalised shipping business.