Axial vibration calculation input data

Here, input data for Axial Vibration Applications are described. Data supplier is indicated in the ‘SUPPLIER’ column.

Axial Vibration Calculation Input Data List

NAME SUPPLIER
Directly Coupled Diesel Engine
Engine type Engine Manufacturer
MCR, kW
Engine speed at MCR, rpm
MIP (or MEP efficiency coefficient), Мpа/bar
Cylinder number
Firing order
Cylinder diameter, mm
Stroke, mm
Conrod length or Crank/Conrod ratio 
Diameter and length of the crankpin
Diameter and length of journal
The tensile strength of crankshaft material
The allowable bending stress of crankpin
Mass of the crank equivalent of radial inertia forces, kg
Radial harmonic coefficients and phases for normal operation
Mass-Elastic system characteristics (mass,kg; stiffness, kN/mm)
Absolute and Relative damping data, N s/mm
Misfiring Mode characteristics:
allowable power and speed, MIP(MEP)
Radial harmonic coefficients and phases for misfiring mode
The allowable axial offset of forward crankshaft end
NAME SUPPLIER
Tilting-Pad Thrust bearing
Mass, kg Engine Manufacturer, thrust bearing Manufacturer
External stiffness (kN/mm)
Internal stiffness (kN/mm)
Oil film stiffness (kN/mm)
Oil film damping, N s/mm
Axial clearance, mm
Allowable axial force
Thrust shaft drawing
Damper
Mass, kg Engine Manufacturer
Stiffness, N/m
Damping data, N s/mm
Grounding stiffness, N/m
NAME SUPPLIER
Propeller
Diameter Propeller Manufacturer
Number of blades
Pitch ( max, nominal)
Expanded area ratio
Mass of dry propeller, kg
Entrained water mass, kg (if there are customer’s value)
Damping, N s/mm (if there are customer’s value)
Thrust at MCR, kN
Thrust = function(rpm)
Excitation: 1-blade, 2-blade, 3-blade order (if there are customer’s value)
Gearbox
Output gear shaft drawing (with gear wheel) Gearbox designer
Shafting
Shafting drawings Shaft designer
Flexible coupling
Mass, kg Flexible coupling manufacturer
Stiffness, N/m
Damping data, N s/mm