Entwicklung eines Entwurfsverfahrens für Schiffsruder auf der Basis statistischer Betriebsprofile
Development of a rudder design procedure on the basis of statistical operation profiles
Title Granting Institution
Technische Universität Hamburg
Place of Title Granting Institution
A new design procedure for ship rudders based on operational profiles will be presented. Main objective of the procedure is the reduction of rudder cavitation. The procedure mainly consists of the parts evaluation and optimization. The evaluation is carried out by calculating a frequency distribution of possible cavitation on the rudder blade surface. This leads to a quantification of the cavitation hazard and a localization of critical zones based on the complete operational profile. The subsequent rudder shape optimisation is carried out by calculating the distribution of mean pressure values on the rudder surface. Based on the pressure distribution alongside horizontal sections the optimization of the profile sections is shown by use of the Profile Theory. Input parameters for the optimization are determined by a new method of equivalent flow in order to consider the inhomogeneity of the slipstream. The capability of the rudder design procedure is shown on the basis of full scale observations.