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).
Experiments on crankshaft torsional vibrations and vibration dampers for the 20 HP engine.
| Identifier | ExFiles\Box 22\4\ Scan127 | |
| Date | 22th April 1927 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/ACL. c. to BJ. Wor.{Arthur Wormald - General Works Manager} c. to RC.{R. Childs} E.{Mr Elliott - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} c. to OY. X3588 Y634 X5010 Hs{Lord Ernest Hives - Chair}/ACLI/LG22.4.27. 20 HP. TORSIONAL VIBRATIONS AND VIBRATION DAMPERS. At various times we have conducted experiments and investigated the question of crankshaft torsional vibrations on our own and other engines and from the results obtained arrived at, and agreed upon, certain definite conclusions with regard to the cause and factors influencing this trouble. Therefore with this experience and collection of data at hand we have reviewed the question from a general aspect in regard to the methods at our disposal which we have reason to believe offer a means of alleviating the troubles experienced on the 20 HP. engine. The question seems of particular interest at the moment as there appears the possibility of being able to improve the power output of the 20 HP. which to be fully appreciated would probably necessitate a lower gear ratio and consequently higher engine speeds with the risk of encountering the resonant speed of the crankshaft within the working range. In the following summary we have considered only such methods of damping the vibrations as are readily applicable to the 20 HP. RR. engine and such types of dampers which have already been proved in practice. These are :- contd :- | ||