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).
Technical discussion on the effects of a balancer on shaft vibration and frequency.
| Identifier | ExFiles\Box 25\3\ Scan228 | |
| Date | 15th January 1927 guessed | |
| contd :- -3- You asked whether the balancer might not split, the period forcing one disturbance higher and another lower than the normal period of the shaft. I observed this effect on some of the earlier experimental types when a rather heavy type of balancer was used. At certain speeds the shaft vibrated within the balancer, the springs giving the shaft rigidity to the shaft, imparted to it a higher frequency. At another speed the balancer mass acting with the shaft resulted in lower frequency. This does not occur however in the commercial device as it is relatively light so the tail cannot wag the dog. It does lower the fundamental period as mentioned before. I shall be glad to discuss this matter further with you at any time. While we have a working knowledge of some of the practical aspects of the device there are many things about it which we do not know. It is more than possible that in an exchange of information I may receive more than I impart. Yours very truly, Sgd. C.E. Summers. c. to Mr. H.M. Crane. Mr. J.{Mr Johnson W.M.} McEvoy. | ||