Propeller Excitation and Response of 230000 TDW Tankers 



MODEL WITH FINS 6-BLADED PROPELLER 

 V 10 KNOTS 



OSCILLOORAPH NO FXTER 



/^^\vv^^V"V/Hv^ 



40 



JlOO kp/m? 



osollooraph huer 

 ^AAAAAAAAAAAa^AA/WWWV 1 T 10o 10 



|kp/m2 



oymnnmpw no filter 



VII KNOTS 



db 



40 



30- 

 20- 



^0^0^t^^m 



]100 kp/ m 2 



k !j' 



MODEL WITHOUT FINS 6-BLAOEO PROPELLER 

 „„ V»KNOTS 



a 



LLOGRAPH NO FILTER 



|lO0 kp/m2 )0 ■ 



OSCILLOGRAPH NO FILTER 



MW^ I,00kp/m2 



'<"Wil I (VkBlPM MA CllTC» W 



MODEL WITHOUT FINS 5-BLADED PROPELLER 

 db v.. 16 KNOTS 



to 



SO ■ 



'OSCILLOGRAPH NO FILTER 



S3 SO SO U0200 250 300 400 SCO 700800 1000 



Figure 21 Pressure fluctuations in cavitation tunnel. Different kinds 

 of signals. Oscillographic recorder and frequency analyser 



639 



