PROPELLER EXCITATION AND RESPONSE 

 OF 230 000 TDW TANKERS 



C.A. Johnsson 



The Swedish State Shipbuilding Experimental Tank 3 

 Goteborg t Sweden 



T. Sjzmtvedt 



Bet norske Veritas ., 

 0slo } Norway 



ABSTRACT 



In cooperation between Uddevallavarvet AB(UV), the 

 Swedish State Shipbuilding Experimental Tank (SSPA) 

 and Det nor ske Veritas (DnV) a comprehensive inves- 

 tigation concerning propulsion, cavitation and vibra- 

 tion has been carried out on two 230 000 TDW tanker 

 ships. The results with reference to propulsion, pro- 

 peller cavitation and erosion have been reported at 

 the 1972 Spring Meeting of the Royal Institution of 

 Naval Architects [4] . 



In the present report the results concerning vibra- 

 tion are reported. Full scale measurements of pro- 

 peller induced pressure fluctuations at different po- 

 sitions on the stern, static and dynamic thrust and 

 torque in the shaft, as well as vibratory response in 

 different parts of the structure have been carried 

 out. 



In model scale the experiments of primary interest 

 in this connection are the measurements of propeller 

 induced pressure fluctuations in the stern, carried 

 out under cavitating and non-cavitating conditions, 

 the transducers being placed in the same positions 

 as in full scale. These tests were carried out in the 

 new cavitation tunnel at SSPA, allowing the use of 

 the same ship model for the cavitation tests as for 



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