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).
Reducing engine noise and addressing crankshaft torsional vibrations across a range of speeds.
| Identifier | ExFiles\Box 14\5\ Scan197 | |
| Date | 22th May 1931 guessed | |
| (2) stiffening the support. To these 2 items we add the silencer to the intake of the carburetter, and you have the complete combination which we hope will completely reduce the fuss, roar, and boom, complaint. In conclusion it will be seen that the difference between the WW. way of getting over this trouble, and the Derby way, is that we wish to eliminate everything that can contribute towards the complaint instead of working only to cure booms, and retaining the sources of vibration that affect roughness only. The only thingthat this memo. does not touch upon is the remaining experiment of centrifugally loaded dry friction with a view to keeping the flywheel-crankshaft steadier torsionally, but to find out whether this experiment is really necessary we ought to take a diagram as we have done in the past of the crankshaft torsional vibrations at the complete range of speeds, from 500 to 3300 RPM., as I am still of the opinion that although the damper is doing much good at the harmonics we shall find that the half speed and harmonic periods still shew the deflection to be greater than that set up by the impulses or the inertia of the pistons. R.{Sir Henry Royce} | ||