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).
Results and methodology of tests on hydraulic shock dampers.
| Identifier | WestWitteringFiles\O\2April1926-June1926\ Scan193 | |
| Date | 16th June 1926 | |
| To R.{Sir Henry Royce} From Hs{Lord Ernest Hives - Chair}/Rp. c. to RJ. RG.{Mr Rowledge} c. to E.{Mr Elliott - Chief Engineer} Da.{Bernard Day - Chassis Design} c. to By.{R.W. Bailey - Chief Engineer} Wor.{Arthur Wormald - General Works Manager} c. to OV ORIGINAL. Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}2/LG16.6.26. HYDRAULIC SHOCK DAMPERS X235 X8410 We have carried out some tests to determine how the load on these shock dampers is likely to increase with increase in velocity of the axle. Unfortunately our apparatus was such that it was impossible to keep the temperature of the oil constant throughout any series of tests and therefore in the attached graph, compensation has been made for the varying oil temperature from a set of figures obtained specially for this purpose. However, we are making arrange- ments to improve our testing tackle with a view to obtaining some reliable figures with regard to the flow of viscous liquids through orifices. We believe these tests will be worth making, because hydraulic damping seems to have so many advantages over friction damping. The curve on the attached blue print was obtained by fitting a very light spring above the high pressure valve and forcing oil by means of a pump through a hole in the casting into the high pressure end of the cylinder, the piston being fixed. After passing into the cylinder, the oil flowed out through the high pressure valve and the passage to the low pressure end, which was open to the atmosphere. The pressure of the oil in the high pressure chamber was taken for each alteration in flow. It will be observed that the light spring above the high pressure valve gave a fixed loading equivalent to 25 lbs./sq. in. pressure. Contd | ||