Rolls-Royce Archives
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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).
Diagram and mathematical analysis of a Delco testing rig.

Identifier  ExFiles\Box 152\1\  scan0097
Date  25th January 1933 guessed
  
Delco Testing Rig
XP32
K=ratio of arms
Movement of slide resisted by oil pressure
slide
Balancing Springs
Vel.
ω
r
Variable speed motor
Adjustable crank disc
Displacement of crank from mid point = r cos ωt
Velocity of end of arm = rω sin ωt
" " piston = Krω sin ωt
∴ x²/r² + y²/(K²r²ω²) = 1
Curve is an ellipse
= x on diagram
= y on diagram if pressure varies as piston velocity
Piston velocity curves at various frequencies
90° 60° 30° mid 30° 60° 90°
  
  


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