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).
Progress report on measuring and reducing low-frequency suspension noise and vibration in Bentley cars.
| Identifier | ExFiles\Box 154a\4\ scan0101 | |
| Date | 15th March 1939 | |
| W/ted Ex/found Caswell KENNINGTON CLAPHAM TONETE R.R. 306. ST. {Capt. P. R. Strong} 74907/4/11/38. C.E. EXPERIMENTAL DEPARTMENT REPORT. noted CLM {D. D. Clapham} REFERENCE:— Lr {Mr Ellor} /HWS/SGL.15/WJ.15.3.39. Subject of Report:— SUSPENSION NOISE ON BENTLEY CARS. W/ted HWR PROGRESS REPORT. General Conclusion:— 1306 Measurements have been made on the low frequency noise and vibration present in cars with independent front wheel suspension, when they travel over uneven roads. The effect of road bumps was reproduced by a swinging weight. The oscillograph used for measuring the effect required a 250 volt A.C. supply, rendering road work impossible. The results showed that the effect was reduced when the fore and aft flexibility of the front suspension was increased. The use of rubber in the torque arm mounting, for example, produced a reduction of noise of 30% and of vibration of 33%. Sound measurements on the road would be possible if a 250 volts A.C. supply to a moving car were arranged and a more reliable microphone procured. ---------- Lr {Mr Ellor} /HWS/SGL. LR {Mr Ellor} Copies of Report Circulated to:— Rm. {William Robotham - Chief Engineer} Da. {Bernard Day - Chassis Design} By. {R.W. Bailey - Chief Engineer} Rm {William Robotham - Chief Engineer} /AFM. {Anthony F. Martindale} Report to be noted for further action by:— Test carried out on:— Bentley 1 B.50. By:— Lr {Mr Ellor} /HWS/SGL. Test No. Date:— | ||