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).
Analysis of frame twisting under offset moments and loads, illustrated with diagrams.
| Identifier | ExFiles\Box 26\1\ Scan039 | |
| Date | 19th March 1964 | |
| - 2 - Tln/CJC. 3.FL. 19.3.64 The offset moments We₁ and We₂ obviously cause the frame to twist more than it would do if e₁ = e₂ = 0. This can be illustrated by considering firstly, the deflection of the frame under loads of W at each corner. FIGURE 1 LONGITUDINAL AXIS and secondly under pure couples about the transverse axis of a sign appropriate to negative We couples. FIGURE 2 TRANSVERSE AXIS If the frame were square i.e. a = b, the twist would be zero if m = W.b. - The location of the m couple(s) is only important if the bend stiffness of the longitudinal is small compared with the torsional stiffness of the crossmember - a condition not encountered in cars. Continued ............. | ||