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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).
Notes and calculations on riding quality, showing various cases of oscillation and spring dynamics.

Identifier  ExFiles\Box 43\2\  Scan220
Date  29th August 1927
  
RIDING QUALITY
DRAWING NO. A10949
SEE ALSO THE FOLLOWING OPERATION DRAWINGS

Case I
DEFLECTION d
SPRING STIFFNESS S
M
TIME OF SWING = 2π√(M/S)

Case II
DEFLECTION d
2M
x
SPRING STIFFNESS S
TIME OF SWING (NEGLECTING ANGULARITY EFFECTS)
= 2π√(DISPLACEMENT/ACCELERATION)
= 2π√(x / (2xS/2M)) = 2π√(M/2S)
I.E. SECOND FREQUENCY IS √2 TIMES AS FAST (1.414 TIMES) AS FIRST FREQUENCY, THOUGH SPRING STIFFNESS IS THE SAME, AND SPRING DEFLECTION IS THE SAME.

Case III
C.G.
a
b
w₁
W
w₂
w₁ = W x b / (a+b)
w₂ = W x a / (a+b)
IF K² = a x b, THIS IS EQUIVALENT TO:
Mass W₁/g
Mass W₂/g

Case IV
TYPES OF OSCILLATION
CENTRE OF OSCILLATION
"BOUNCING" OR REAR SPRING OSCILLATION
CENTRE OF OSCILLATION
"PITCHING" OR FRONT SPRING OSCILLATION

DRAWN BY: AF
DATE: 8-29-27
TITLE: NOTES ON RIDING QUALITY
DRAWING NO. A10949
ROLLS-ROYCE OF AMERICA, INC.
  
  


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