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).
Test report detailing pressure and temperature performance of a damper and governor system.
| Identifier | ExFiles\Box 151\2\ scan0031 | |
| Date | 14th March 1933 guessed | |
| -2- the minimum pressures at both the "damper" and "governor" gauges when the bellows was suddenly released were recorded, also the time taken for the damper to regain its normal pressure - 5 lbs/sq.in. - measured from the instant of release. These tests were repeated at 10 lbs/sq.in. and also at 5 and 10 lbs/sq.in. at pipe line temperatures of 40 and 60°C. [TABLE] Pipe Line Temp. | Normal Bellows Pressure. lbs/sq.in | Max. Press. lbs/sq.in | Min. Press. lbs/sq.in | Time to Regain Normal Pressure. Secs. | | Damper. | Governor. | Damper. | Governor. | 20°C | 5 | 22 | 6 | 0 | 4 1/2 | 15 to 20 | 10 | 40 | 11 1/2 | 3 | 9 | + 13 to 15 40°C | 5 | 19 | 6 | 1 1/2 | 4 1/2 | 10 | 10 | 30 | 12 | 5 | 9 | 5 60°C | 5 | 14 | 6 1/2 | 2 | 3 1/2 | 3 | 10 | 24 | 12 1/2 | 5 | 8 | 3 + Reached 5 lbs/sq.in. in 3 secs. The relatively large increase (and decrease) in pressure at the damper compared with that obtained at the governor may be due either to air in the system, or to the viscosity of the fluid. The former possibility was eliminated as far as possible by first running the oil through the pipe line back into the governor, and then, after closing the return pipe, bleeding the bellows via the screw provided for that purpose in the damper end cover. Therefore in order to maintain a constant pressure in the system during rapid change of axle movement, it would appear necessary to increase the diameter of the pipe lines to reduce the viscosity resistance (or use fluid of lower viscosity, in which case trouble may arise due to governor fluctuation) and increase the capacity of the governor pump. Ixxxthe | ||