Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE credits
The Swedish Transport Administration ferry operator has in recent years begun renovation of ferries and ferry terminals to modernize, streamline and greening activities. One thing they do to accomplices this is to change the propeller drift ferries to cable ferries.
In 2010, the Vectura Consulting AB, designed a ferry berth at Hemsö for a cable ferry, commissioned by the Swedish Transport Administration. A CAD software used to design the ramp and ferry flap to pass the set-up requirements for buses clearance. Working methodology proved to be both time-consuming and difficult.
This thesis is about to check whether the place molded convex concrete ramp, which was designed are a good solution for ferry berths with extreme water level differences. In addition a program is developed for solving the geometric problem. The program analyzes the problem in two dimensions, x and y direction.
The program is developed in MatLab and a non-linear solution method has been used. Using the program, a locally optimal solution is found in about one day when the variables are given, compared with about a week of work with a CAD program. A comparison has been made between the projected solution to Hemsö and the solution offered by the program. The program's solution was better based on the conditions set out in this thesis. The prerequisites were however changed at the last moment for the design of Hemsö which may make the comparison a little misleading.
For buses (type vehicles) tested in the program, it was difficult to find a design solution with a convex situ concrete ramp when the difference in water levels is very large. It’s a very unstable solution that should be planned with caution. As each small change in clearance requirements or design prototype vehicle has great influence on the ramp geometry.
The final solution can be used when the water level difference is about 0.7 m from minimum to maximum water levels for the design vehicle
2013. , 48 p.