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213092 results in Engineering

Page 2007 of 10655

  • John Edmund Hodgson Honorary Fellow 1875–1952

  • Journal:
    The Aeronautical Journal / Volume 56 / Issue 497 / May 1952
    Published online by Cambridge University Press:
    28 July 2016, pp. 319-321
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  • Oscillatory Occurrences in Ball Bearings: Premature Fatigue and its Elimination

  • M. S. Frenkel
  • Journal:
    The Aeronautical Journal / Volume 56 / Issue 504 / December 1952
    Published online by Cambridge University Press:
    28 July 2016, pp. 885-908

  • In this paper it is shown how, in an angular contact ball bearing, the motion of a ball depends on the dimensions, loading and speed of the bearing. In general, ball motion in an angular contact bearing differs from the simple motion usually visualised by including oscillatory occurrences, shown here analytically, graphically and visually. These oscillatory occurrences are shown to lead to premature fatigue of the bearing metal, as a function of the speed of rotation, thereby imposing the present limitations on maximum speed and “ life.”

    It is further shown that only when the dimensions of an angular contact ball bearing are related in a certain way, a motion is produced in which the oscillatory phenomena are eliminated. These relations are given as functions of loading and speed in a system of equations and limiting conditions (hereafter referred to as “ Relations of the Dimensions ”).

  • On The Balance and Inertia Torque of Multi–Cylinder Engines

  • E. J. Fearn
  • Journal:
    The Aeronautical Journal / Volume 32 / Issue 213 / September 1928
    Published online by Cambridge University Press:
    28 July 2016, pp. 799-806

  • In a previous issue the equations of motion were obtained of a piston operated by an auxiliary connecting rod. together with the stresses in such a rod and its effect on the master rod stresses. In the following article the problem of the balance and the torque due to inertia forces has been examined and equations derived which may be applied to any multi–cylinder engine.

    The following equations show that all balance and inertia torque equations for a single cylinder may be reduced to the form of Σ[f1 (sin θ) +f2 (cos θ)]. These functions are combined vectorially for the multi–cylinder engine as shown in Appendix II. of the previous article.

Page 2007 of 10655