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1、Calculation of starting point load for propeller of 19000DWT MPC According to CCS rules, the actual pre-pull-up force of starting point is to be not less than: Ws=A(0.002+k/20)P s+(2-1)/(C1/E1+C2/E2) ( N ) Where: A=contact area of fitting at screw shaft=1599068.86 mm2 K=taper of the screw shaft cone
2、=0.05 2=boss expanding factor=18x10-6 1/ 1=shaft expanding factor=11x10-6 1/ C1=(1+k12)/(1-k12) 1 = 0.7 Where: k1=D0/D1(D0 =0 for solid shaft, D1=mean tape diameter=456.85mm) 1=shaft poissons ratio=0.29 C2=k22+1/k22 1+2 = 3.86 Where: k2=D2/D1= 0.7=951.05/456.85=2.08 (D2=mean boss outer diameter=951.
3、05mm) 2= shaft poissons ratio =0.33 E1=shaft youngs modulus=2.06x105 N/mm2 E2=boss youngs modulus=1.18x105 N/mm2 P s =KS s (C1/E1 +D1C2/E2)=43.32 where: S s=pull-up length of the temperature when installation=13mm (at 30) So: Ws=325682 N Pressure of the oil pump= Ws/ Ap=5.1 N/mm2=51 bar where：Ap=area of the piston in hydraulic nut=63711 mm2
