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 for inertia and natural frequency of vibration for engine components using the Bifilar suspension method.
| Identifier | WestWitteringFiles\P\2July1926-September1926\ Scan139 | |
| Date | 4th September 1926 guessed | |
| contd :- -12- The Bifilar suspension method was employed. The following are the results :- [Image of a Bifilar Suspension blueprint with labels d, l, and W] BIFILAR SUSPENSION SPRING DRIVE PARTS :- l = 4' d = .404' W = 6.875 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 1.22 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 modal point. contd :- | ||