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).
Page detailing the formulas for an equi-momental system representing a connecting rod's mass distribution and dynamics.
| Identifier | WestWitteringFiles\M\2October1924-December1924\ Scan13 | |
| Date | 25th October 1924 guessed | |
| -5- Contd. Mx{John H Maddocks - Chief Proving Officer} = (k^2 / a(a + b)) M at the crosshead. Mp = (k^2 / b(a + b)) M at the crankpin. Mg = (a b - k^2 / a b) M at the centre of mass. where a and b are the respective distances XG and GP between the crosshead X and the centre of mass G, and between the centre of mass and the crankpin P (see diagram). It may be verified that :- (i) The sum of these three masses is M (ii) The centre of mass of these three masses is G.{Mr Griffiths - Chief Accountant / Mr Gnapp} (iii) The moment of inertia of these three masses about G is MK^2. Thus this system is an equi-momental system consisting of massive particles which dynamically completely represents the con. rod, not merely for linear forces only, but for couple actions in addition. (6) The first observation to be made is that the portions Mx{John H Maddocks - Chief Proving Officer} and Mp enter only into the ordinary linear balancing problem, being direct contributions to the pure reciprocating and pure revolving masses respectively. Contd. | ||