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 design, discussing the relationship between frequency, stress, deflection, and material properties.
| Identifier | ExFiles\Box 56\2\ Scan097 | |
| Date | 28th August 1930 guessed | |
| -3- (again omitting the invariable portion namely shear modulus C and ) also varies as the same quantity d kD² There lies in the correspondence here pointed out, the difficulty of rearranging the design of a spring such as to increase the frequency number without at the same time increasing the stress for a given deflection. Any increase in the quantity d/kD² brought about by increasing d or decreasing k or D also has a similar increase on the stress set up in material by a given spring deflection. The problem therefore reduces to this, that to attain the desired end we can only increase the stress for a given deflection. This can be done in the set up position without actually increasing the stress if the set up deflection is reduced, but this will, of course, result in the stress in the fully compressed position being increased even though the deflection is less than previously. It can be argued with some reason however, that the effect of putting up the natural frequency in a certain proportion is to so much reduce the dynamic stress due to oscillations that an increase in the static stress even in the set up position is allowable, or at least that a | ||