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 a damper's performance, detailing the resistance during its upward return stroke and rebound.
| Identifier | WestWitteringFiles\O\2April1926-June1926\ Scan146 | |
| Date | 20th May 1926 | |
| Contd. -5- Hs{Lord Ernest Hives - Chair}/ACL/T20.5.26. been confirmed by looking up the cylinder when in operation. The chief point noted is the rapid growth of pressure and the considerably greater resistance offered over this range, in this direction, compared with the other motions of the damper. (4) RESISTANCE DURING UPWARD RETURN TO ITS MEAN POSITION. The piston is still in the small bore but with the flap valve open the effect of clearance is negligible and gives very nearly the same resistances as shewn by Curve No.1. The differences are so small that Curve 1 represents the action of the damper in both this and the first case. The chief points of interest seem to be the following:- (1) For a given velocity the maximum possible resistance is only obtained when the spring passes through its mid-position in the rebound direction when it is effected by the plunger entering the small bore and the displaced oil having to pass through the spring loaded valve set to release at approx. 150 to 170 lbs/sq." (2) This "rebound" damping is approx. 170 lbs. more than obtained during the first part of the rebound. (3) The damping is very small for low spring velocities such as would result from small deflections except for the second part of the rebound. Contd. | ||