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 spring stresses, frequency, and deflection, including mathematical formulas.
| Identifier | ExFiles\Box 56\2\ Scan099 | |
| Date | 28th August 1930 guessed | |
| -5- d/kD^2 however, has been put up which means that 1/kD^5/3 has been put up. This can be done either by reducing k or reducing D.{John DeLooze - Company Secretary} Other circumstances could be brought into account to determine whether the change should be made by altering k on the one hand or D on the other. It will be clear that in any case the rate of the spring would have been increased because the set up load remaining the same the initial deflection is less. The stress on the material may suffer no change in the set up position or may be increased, but in the fully compressed position it will be increased in either case, still, as mentioned before, the reduction in dynamic stress due to increased frequency number of the spring may more than counteract this. Beyond the general lines of change indicated in the above, no definite rule for the change can be laid down because it is difficult to estimate the relative magnitude of the stresses due to the natural periods in the spring and those due to the statical conditions. From the fact that the frequency and the material static stress for a given deflection vary as the same quantity d/kD^2 it will readily be seen that there is no optimum set of quantities which can be arrived at to give the maximum frequency for a given stress per unit deflection. The whole problem/therefore somewhat indefinite and can | ||