Keyword: Optimal Speed


The speed limit debate: Optimal speed concepts revisited under a multi-fuel regime

Roy Tan, Harilaos N. Psaraftis*, David Z.W. Wang

The purpose of this paper is to revisit speed optimization and speed reduction models for liner shipping in a multi/flexible fuel context with regards to the current ongoing speed limit debate at the International Maritime Organization (IMO). The focus is mainly on analyzing the influence of a maximum average speed limit on the optimal speeds, carbon intensity and emissions in conjunction with fleet deployment for dual fuel (DF) Neopanamax container vessels utilizing liquefied natural gas (LNG).

Transportation Research Part D: Transport and Environment / 2022
Go to paper

Green maritime transportation: Speed and route optimization

Psaraftis , Harilaos N.; Kontovas, Christos A.

Among the spectrum of logistics-based measures for green maritime transportation, this chapter focuses on speed optimization. This involves the selection of an appropriate speed by the vessel, so as to optimize a certain objective. As ship speed is not fixed, depressed shipping markets and/or high fuel prices induce slow steaming which is being practised in many sectors of the shipping industry. In recent years the environmental dimension of slow steaming has also become important, as ship emissions are directly proportional to fuel burned. Win-win solutions are sought, but they will not necessarily be possible. The chapter presents some basics, discusses the main trade-offs and also examines combined speed and route optimization problems. Some examples are finally presented so as to highlight the main issues that are at play.

Book chapter in Green Transportation Logistics: The Quest for Win-Win Solutions / 2015
Go to book