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).
Analysis of torsional engine vibrations in the chassis frame at low and medium RPMs.
| Identifier | ExFiles\Box 3\1\ 01-page088 | |
| Date | 16th July 1913 guessed | |
| AV/2118/018313 From weekly Report File Engine Vibrations (X.181/A) Analysing vibrations on our engines is now a very difficult matter (except those at high speeds which we improved with light reciprocating parts), we have collected a lot of information but I want to go over it again before making any statements. From Mr Royce's suggestion that these might be a torsional vibration of the frame due to the reaction of the explosions we have obtained one definite result. If we run a chassis on the dynamometer (we have tried this on 3 different cars) at about 450 to 500 revs. we get a bad period, it is undoubtedly the reaction from the explosion because of its amplitude, it shakes the steering column and rocks the whole chassis. If when this period is on we put some heavy weights across the frame 500 or 600 lbs close up to the dashboard it disappears at that speed but comes on again at about 800 revs, not so violent but definite. The tie rods make no difference to it so we think it is as suggested by Mr Royce a torsional vibration of the whole frame when it is a bare chassis and of the front part of the frame when the weights are on. | ||