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 steering wheel and chassis movement under different car configurations to reduce vibration.
| Identifier | ExFiles\Box 90\5\ scan0070 | |
| Date | 13th September 1935 | |
| -2- Hs{Lord Ernest Hives - Chair}/PJH.25/KW.13.9.35. Steering Wheel Movement Chassis Movement (1) Standard car with bumper bar 0.30 0.18 (2) Ditto with one piece wings 0.21 0.12 (3) One piece wings with rigid scuttle and dash 0.18 0.11 (4) As (3) but with bumper bar removed 0.16 0.10 No increase of resonant frequency can be detected from the curves, but this may be due to insufficient accuracy of measurement. The one piece wings considerably reduce the sideways vibration; the effect of the rigid dash is not so great. From theoretical consideration it would seem that one piece wings have a considerable sideways stiffening effect but not so much in torsion, while the rigid dash would be most beneficial in torsion. Measurements were not taken of front wing movement during the tests with one piece wings and rigid dash, so the effect of these modifications on torsional movement is not shown by the curves. However from visual observation it was noticed that the rigid dash reduced the torsional movement more than the one piece wings. Attempts were made to reduce the steering wheel movement by making the connection between the column and the dash flexible sideways. This was however unsuccessful as the wheel movement was far greater than before. We think the most that could be achieved by alteration to the steering mounting would be to make the wheel movement equal to that of the chassis by mounting the column rigidly to the dash at two points and making the connection between the steering box and the frame flexible sideways. This should present no difficulties. | ||