Logistic Time Requirements in Fast Sea Transportation Systems
Doctoral thesis, 1998
The dissertation deals with logistic time requirements in fast sea transportation systems and the benefit of the application of the total time definition.
The transportation engineering approach, to create new transport systems with high effectiveness, high service levels and also with high resource utilisation, has to some extent gained acceptance in the transportation industry, but it has not been fully realised that the transport system and the traffic system are not identical and that by focusing on high performance of the traffic system no guarantee is given that the transport system will become effective. This may be the explanation why, in the present rush for introducing high speed passenger services, the support systems have not been designed to match the performance at sea and the high energy and capital costs associated herewith.
The main objective for moving passengers is normally to obtain the shortest possible time in the transport system. This goes for all transportation modes; air, land and sea and it has for waterborne transportation led to a shifting of interest from conventional ferries to fast ferries. In recent years speed at sea has been doubled at some ferry services, and as a consequence, sailing time has been reduced accordingly. Logistic time requirements in a ferry operation are related to the performance of the main system, the movement system and the supporting subsystems, like access systems, and if these work in sequence or to some extent in parallel. Time requirements in ferry operation can be divided into two categories; one operational category which includes cycle, sailing, and terminal time, and one category referring to the user of the provided service perspective, the total time. The total time is the time definition which is the most relevant to the passenger, as this is the time the passenger has to spend in the actual transportation system. An example (paper No IV) shows that an increase of the speed with 100% in the vessel movement system only gives a reduction of the total time in the transport system with 15%. The thesis includes six papers reporting data collected from fast and conventional sea transport systems.
logistic time requirement