SC4312-401-08JS螺旋桨无键联接计算书.doc

CALCULATION FOR PROPELLER KEYLESS FITTING SC4312-401-08JS螺旋桨无键联接计算书/ 55PAGEAREA : 0.0625m2 1. Specification 1.1 Technical data of main engine: Type: 6S50MC-C Maximum continuous rating (MCR): P = 9480 kW Rated revolution at MCR: R = 127 r/min Mean torque (MCR): MT = 7.129 x 105 Nm 1.2 Technical data of shafting: Material: forged steel Modulus of elasticity: EP = 206000 N/mm2 Poissons ratio: nP = 0.30 Coefficient of linear expansion: P = 0.000012 mm/mm/C Diameter of the screwshaft cone at the midlength of the boss: dPM = 482.37 mm Bore diameter of the propeller shaft: di = 0 mm Half of Taper of the propeller shaft cone: = 1/40 Contact area fitting at screwshaft:A = 1.64 x 106mm2 1.3 Technical data of propeller: Material Cu3 (Ni-Al-Bronze) Modulus of elasticity: EM = 118000 N/mm2 Poissons ratio: nM = 0.33 Coefficient of linear expansion: M = 0.0000175 mm/mm/C Specified minimum yield stress: RS.MIN = 245 N/mm2 Propeller thrust: S = 1031893 N (MCR) Outside diameter of the boss at its midlength: dH = 985.87 mm 1.4 Other technical data: Constant for diesel engine with flange coupling: C = 1.2Temperature at time of fitting propeller on the shaft: TCoefficient of friction for fitting of boss assembly on shaft: = 0.13Safety factor against friction slip at 35C SF = 2.8Area of the piston in the hydraulic nut A1 = 1.05558 x 105mm22. Calculation 2.1 Calculation for axial push-up by the oil shrink method:l Minimum required surface pressure at 35C:P35 = Where: B = ; F = ;l Corresponding minimum push-up length at 35C:d35 = Where:K = ;l Minimum push-up length at temperature T (T d0 = 11.16 mmIn the state of any other temperature, the axial push-up can be determined by linear interpolation. All components must be placed in same ambient condition for sufficient time for their temperature to stabilize. It is recommended that the push-up length is to be in the range from Min. axial push-up d35 to Max. axial push-up d0 , shown in the fig. 3-2.2.2 Thrust force for fitting propeller on shaft: The thrust force for fitting propeller on shaft can be calculated by following formula: H = PT A sin + 1 PT A cos PP = H / A1 Where H - the theoretical axial thrust force for fitting propeller, in N PP - the pressure of oil pump when axial push-up to be dT 1 - Coefficient of friction for fitting of boss assembly on shaft cos=0.9997 sin= =0.025When 1 = 0.01H =2.97x105 x dT (N)When 1 = 0.02H =3.82x105 x dT (N)When 1 = 0.03H =4.67x105 x dT (N)When 1 = 0.04H =5.52x105 x dT (N)So 1 = 0.01 PP=H/A1=2.814 dT (MPa) 1 = 0.02 PP=H/A1=3.619 dT (MPa) 1 = 0.03 PP=H/A1=4.424 dT (MPa) 1 = 0.04 PP=H/A1=5.229 dT (MPa)In the condition that the coefficient of friction 1, to be 0.01, 0.02, 0.03 or 0.04, the thrust force, PP, can be found out according to above formulas, when fitting propeller on shaft and Coeff