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).
Blueprint analyzing suspension damper motion, phase relationships, and effectiveness under different conditions.
| Identifier | ExFiles\Box 56\1\ Scan078 | |
| Date | 25th February 1931 | |
| DAMPING CHANGES OVER AT PEAKS OF CURVE MAX. VELOCITY OF AXLE 2.0 FT SEC CHASSIS .70" ASSUMING S.H.M. THE AXLE MOTION PARTICULARLY WILL BE SOMEWHAT DIFFERENT FROM S.H.M. DAMPER MOTION AT TWO DIFFERENT PHASE RELATIONSHIPS CHASSIS MOTION AXLE MOTION 4.1 - 4.7 / .93 = No DAMPING UPPER DAMPING REFERS TO DOTTED CURVE 5.6 - 3.7 / 9.3 = 1.9 / 9.3 = 20% AT AN AXLE AMPLITUDE OF 1.0" AND A CHASSIS AMPLITUDE OF 3.5" THE DAMPING WHICH IS EFFECTIVE IN STOPPING THE CHASSIS MOVEMENT VARIES BETWEEN NOTHING AND 20% ACCORDING TO THE RELATIVE POSITIONS OF THE TWO VIBRATIONS WHICH OF COURSE KEEP ALTERING IN PHASE RELATIONSHIP. DAMPER MOTION CHASSIS MOTION RED EFFECTIVE BLUE DETRIMENTAL MAX. VEL. OF AXLE 2.0 FT. SEC. CHASSIS 1.420" PERIODICITY OF AXLE 460 PER MIN CHASSIS 65" RED AREAS ARE EFFECTIVE DAMPING BLUE " " DETRIMENTAL " 6.5 - 2.8 / 9.3 = 3.7 / 9.3 = 40% 5.35 - 3.95 / 9.3 = 1.40 / 9.3 = 15% AT AXLE 1.0" CHASSIS .50" THE CHASSIS DAMPING VARIES BETWEEN 15% AND 40% OF THE FULL AMOUNT CHASSIS DAMPING WHEN AXLE OSCILLATIONS ARE MAINTAINED AS AT HIGH SPEED ON BAD ROADS DAMPER OF UNIFORM LOAD TYPE I.E. UNAFFECTED BY VELOCITY. VIV 25-2-31 | ||