1、轴系计算书A.Introduction 介绍B .Engine and propeller parameter 柴油机和螺旋桨参数C. Definitions and assumptions 定义与假设D. Input data 输出数据E. Bearing reaction influence 轴支撑反力影响F. Jack correction factors千斤顶无轴承无距离修正负荷G. Propeller 50% immersed.螺旋桨50%浸没 G1 .Max. Shear forces, deflections, slope and bending at each shaft se
2、ction .轴每节最大剪切力，挠度，坡度和弯曲 G2. Optimum alignment results. G3. Diagram of moment&shear force at the end engine output end. G4. Shaft bending moment plot.G5. Shaft stress plot.A .IntroductionThe alignment calculation for shaft system has been carried out by using the NauticusMachinery Calculation Packag
3、e from Shaft Alignment tool DNV software.The alignment program uses the transfer matrix method for solving the equations. Allstate quantities are related to the X-axis that coincides with the shaft center line andpoints forward. The shaft line is modeled as elements with different characteristics. T
4、hedistribution of mass is continuous in shaft and flanges, and concentrated (discrete) inthe other element types. The system is considered to have fixed positions at the bearingsB. Engine and propeller parameterEngine type YMD B&W 6S35MCNominal power 4440KWNominal speed 173rpm Mass of turning wheel
5、1845kgPropeller parameterPropeller diameter 4180.0m mMass of Propeller (dry) 6339.4kgintermediate shaft 0315 X 4400Propeller shaft 0360 X 6660.C. Definitions and assumptionsReference line Aft sterntube bearing is taken as being supported at one fourth of bearing length from the aft end static condit
6、ion.For all other bearings at the mid point Bearing offsets Positive when above the reference lineBearing stiffness Bearing are considered to be infinitely stiff.Bearing load influence Show the change bearing reaction when one bearing is moved vertically relative to the others. Hull deflections Defl
7、ections due to different draught and load condition are not considered. Thermal expansion The thermal expansion of the engine structure一i.e. from the engine seating to center of the main bearing is 0.14mm, when the engine temperature is raised from cold (200C) to normal running temperature (550C) Bu
8、oyancy effect The buoyancy effect for the shaft parts in water and oil is considered.Warm condition Warm (550C) condition at MCR speed.Cold condition Static cold (200C) conditionG2 .Optimum alignment results Operating condition 1 (50%)Operating condition 2 (50%)G3 .Diagram of moment&shear force at t
9、he end engine output end On cold static end shear force f=4.34kn:At engine output end shear force F=4.34KNMoment M=一13 .70KNMTurning wheel weight G=18.09KNTherefore F+G=22.43KNOAMoment M=一6.11KNMTurning wheet weight G=18.09KNTherefore F+G=26.91KN warm static condition:engine output end shear force F
10、=8.82KNMoment M=一6.11KNMTurning wheel weight G=18.09KNTherefore F+G=26.91KN G4 .Shaft bending moment plotG5 .Shaft stress plotG6. Shaft deflection plotG7. Open shaft (gap and sag) and deflection plotH. Propeller 75% immersedH1. Max. Shear forces, deflections, slope and bending at each shaft sectionOperating condition 1 (75%(cold)The slope of Propeller shaft at stern tube supporting is 0.297E-03 rad.Operating condition 2 (75%(warm)The slope of Propeller shaft at stern tube supporting is 0.301E-03 rad.
