Here, input data for Torsional Vibration Applications are described. Data supplier is indicated in the ‘SUPPLIER’ column.
Torsional Vibration Calculation Input Data List
| NAME | SUPPLIER |
| Engine | |
| Engine type | Engine Manufacturer |
| MCR, kW | |
| Engine speed at MCR, rpm | |
| MIP (or MEP efficiency coefficient), Мpа/bar | |
| Cylinder number | |
| Firing order or firing angles | |
| Cylinder diameter, mm | |
| Stroke, mm | |
| Angle between banks for V-engine, degree | |
| Connection rod length, mm or Crank/Conrod ratio | |
| Crank pin and journal diameter, mm | |
| The tensile strength of crankshaft material, Mpa | |
| Reciprocating mass, kg | |
| Harmonic coefficients and phases table for normal mode | |
| Mass-elastic system characteristics | |
| Absolute and Relative damping data | |
| The phase angle between Master and Slave engines for two engine installations | |
Misfiring Mode data:
– harmonic coefficients and phases table |
|
| NAME | SUPPLIER |
| Damper | |
| Type, manufacturer | Damper Manufacturer |
| Casing part inertia, kgm2 | |
| Inner part inertia, kgm2 | |
| Actual stiffness, Nm/rad | |
| Actual relative damping | |
| Flexible coupling | |
| Type, manufacturer | Flexible coupling Manufacturer |
| Inertia, kgm2 | |
| Stiffness, Nm/rad | |
| Relative damping data | |
| Gearbox | |
| Type, manufacturer | Gearbox Manufacturer |
| Mass-Elastic system characteristics | |
| Gear ratio | |
| The tensile strength of gear shafts, Mpa | |
| Shafting | |
| Shafting drawings | Shaft Designer |
| The tensile strength of propeller and intermediate shafts, Mpa | |
| Propeller | |
| Diameter, mm | Propeller Designer |
| Pitch, mm | |
| Expanded area ratio | |
| Polar Inertia of dry propeller, kgm2 | |
| NAME | SUPPLIER |
| Impeller | |
| Blade number | Impeller Manufacturer |
| Vane number | |
| Disk diameter outer and inner, mm | |
| Disk length, mm | |
| Radial clearance, mm | |
| Polar Inertia, kgm2 | |
| Entrained liquid polar Inertia, kgm2 | |
| Damping data | |
| Dynamic viscosity of liquid, Pa·s | |
| Excitation moment as a percent of mean torque or defined by orders | |
| VFD Electromotor | |
| Power, kW | Electromotor Manufacturer |
| Rated speed, rpm | |
| Operation speed min and max, rpm | |
| Poles Number | |
| Pulses number | |
| Damping data | |
| Rotor stiffness, kNm/rad | |
| Excitation moment as a percent of mean torque or defined by orders | |
| Short circuit duration, s | |
| Peculiar unit | |