设计计算书(全英文)

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General
The design of the crane complies with the following rules:
API-2C Specification For Offshore Pedestal Mounted Cranes (2004)”
ABS Guide for Certification of Lifting Appliance (2007)”
API-9A Specification for Wire Ropes”
AWS D1.1 Structural Welding Code-Steel”
AISC Manual of Steel Construction-Allowable Stress Design， 9th Edition”
Main Technical Parameters
Main Hook Whip hook
SWL/Working radius Please see load capacity curve of general drawing
Hoisting Speed Full load 18m/min 67m/min
Hoisting Height 95m 100m
Slewing speed 00.85r/min
Slewing angle >360º
Luffing angle 15º～82º
Luffing time 180s
Stowing angle for boom -5º15º
Working sea state Grade 45
Electric motor
Type Y400M1-4-H Y355M-4-H
Power 400kW 250kW
Speed 1790r/min 1790r/min
Source AC440V， 60Hz， 3Ph
Working duty S1
Vertical dynamic coefficient calculation
Calculation of dynamic coefficient for onboard lifts of main hook by General method”:
Dynamic coefficient for onboard lifts:
CV01.330.0012HsigHsig1.330.0012×6.8921.39<1.40
There: Hsig-Sea significant wave height， for sea state of grade 45，
Hsig2.1m6.89ft
So take CV01.40
Calculation of dynamic coefficient for offboard lifts of main hook by General method”:
Vertical velocity of the supply boat deck supporting the load:
Vd0.6Hsig0.6×6.894.13ft/s
Vertical velocity of the crane boom tip due to crane base motion:
Vc0.05HsigHsig0.05×6.8922.37ft/s
Actual steady hoisting velocity for the SWL to be lifted: Vh18m/min0.98ft/s
Relative velocity: VrVh(Vd2Vc2)0.50.98(4.1322.372)0.55.74ft/s
Dynamic coefficient for offboard lifts:
CV1Vr(K2/gSWL2)0.515.74×[155814.2/(32.2×154322)]0.52.02
There: K2-Vertical spring rate of the crane at main hook，
pre-take K22274N/mm155814.2Lb/ft
g-Acceleration due to gravity， g32.2ft/s2
SWL2-Safe working load， SWL270000kg154322Lb
Calculation of dynamic coefficient for offboard lifts of whip hook by General method”:
Actual steady hoisting velocity for the SWL to be lifted: Vh67m/min3.66ft/s
Relative velocity: VrVh(Vd2Vc2)0.53.66(4.1322.372)0.58.42ft/s
Dynamic coefficient for offboard lifts:
CV1Vr(KW/gSWLW)0.518.42×[44537.9/(32.2×44092)]0.52.49
There: KW-Vertical spring rate of the crane at whip hook，
pre-take K3650N/mm44537.9Lb/ft
g-Acceleration due to gravity， g32.2ft/s2
SWLW-Safe working load， SWLW20000kg44092Lb