From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Calculations of inertia and the natural frequency of vibration for a crankshaft and associated parts.
| Identifier | ExFiles\Box 6\1\ 01-page015 | |
| Date | 1st September 1926 guessed | |
| contd :- -12- SPRING DRIVE PARTS :- l = 4' d = .404' W = 6.865 lbs. Time for complete oscillation = 1.81 secs. I = .005819 Units. CRANKSHAFT :- I = .016823 Units. FLYWHEEL :- I = .6911 Units. BIG END BEARINGS - LOOSE SHELL TYPE. Rotory mass equivalent to 1.28 lbs. I = .008 Units for the six big ends. This increases the total inertia of the crankshaft alone to .016823 + .008 = .024823 Units. ESTIMATION OF NATURAL FREQUENCY OF VIBRATION OF CRANKSHAFT FROM INERTIA & TORSIONAL RIGIDITY. For the purpose of simplicity we assume the crankshaft to consist of a shaft with a flywheel at each end. It differs from a simple torsional pendulum inasmuch as the fixed end is replaced by a nodal point and when oscillating the forward end will rotate in the opposite direction to the rear end relative to the nodal point. contd :- [Text from diagram] BIFILAR SUSPENSION | ||