Propeller Excitation and Response of 230000 TDW Tankers 



O Fist ship JThorsharnnw" 6 N. without fins 



O- — .. » » •• with 



■ Ssoond ship;*Nors« King"6bl 



Meas. point D1 D2 D3 

 Direct, of vibr. V L Tr 



D1 D2 D3 Dd D5 06 

 V L Tr V V V 



Figure 3 Vibration levels in deck house. For positions of pickups, 

 see Figure 1. Numbers indicate approximate number of 

 revs per min. 



621 



