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).
Theoretical analysis of the dynamics of a connecting rod using an equi-momental system.
| Identifier | WestWitteringFiles\M\2October1924-December1924\ Scan14 | |
| Date | 25th October 1924 guessed | |
| -4- Contd. with the subject, however, is considered to be more confusing than the one to which we proceed below. (5) It is considered that the dynamics of the con. rod can be more readily appreciated by replacing the con. rod by an "equi-momental system" of three massive particles, rigidly connected, one at the crosshead, one at the crankpin, and one at the centre of mass of the con. rod. Such an equi-momental system is such that it has (a) The same mass (b) The same centre of mass (c) The same moment of inertia about an axis through the centre of mass parallel to the engine axis. It is then readily provable that such a system has the same moment of inertia about any other parallel axis and is therefore, as regards the transverse couple effects with which we are concerned, a complete dynamical equivalent. There are, of course, numerous other equi-momental systems, but in the present case the required one is as mentioned above. If the mass of the con. rod and its moment of inertia about an axis through its centre of mass parallel to the engine axis are respectively M and Mk2, k being the radius of gyration about that axis, the respective values of the three component massive particles are:- Contd. | ||