Crank Rumble
- This is an amplitude modulation of engine noise perceived inside a car with a modulation frequency of 0.5 order. Some of the factors affecting crank rumble are:
- Bearing clearances
- Powertrain mount bracket stiffness
- Ancillary bracket stiffness
- Crankshaft counter balance weight
- Flywheel-end bearing housing stiffness
- Bed-plate stiffness
- Crankshaft pin diameter
- Crankshaft web stiffness
- Flywheel bending stiffness
- Flywheel mass and inertia
- Oil pressure and viscosity
- Some additions that improve crank rumble are:
- Some additions that improve crank rumble are:
- Bending damper on crankshaft nose
- Structural sump
- Ladder frame
See also: Engine Excitation Mechanisms, Engine Orders.
Subjects: Engines Noise & Vibration