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Theory and Design of Pendulum Dampers

  • J. J. Williams
Chapter

Abstract

There is sometimes a need to damp the camshaft torques described in  Chap. 9. The reactive pendulum damper described below has been described in the literature. In the past it was used to damp the torsional vibrations of crankshafts used in both automotive and aero engines, which had long crankshafts that lacked torsional stiffness. The theory on which it is based is also widely available in the literature. However, both the basic vibration theory and a description of the damper are given as it is relevant to the subject considered in this book. The advantage of this damper is that it is almost purely reactive and therefore dissipates very little energy. An incorrectly designed or significantly worn damper can exacerbate the problem rather than alleviating it. The maximum damping torques generated by the damper while retaining linear motion must be equal to the torques causing the vibration. It is therefore necessary to ensure the damper has sufficient capacity. An oversize damper will add additional inertia to the engine which will cause slower transient response and will reduce the effective power available when engine speed is increasing.

Keywords

Engine Speed Angular Displacement Gear Tooth Polar Moment Valve Timing 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. 1.
    Den Hartog JP (1956) Mechanical vibrations. Chapters 2, 3 and 5, 4th edn. McGraw-Hill, New YorkGoogle Scholar
  2. 2.
    Sarazin GF (1937) U.S. Patent 2079226, May 1937Google Scholar
  3. 3.
    Chilton R (1939) U.S. Patent 2184734, December 1939Google Scholar
  4. 4.
    Ker Wilson W (1956) Practical solutions of vibration problems, devices for controlling vibrations, 3rd Edn, Vol. 4. Chapman Hall, LondonGoogle Scholar

Copyright information

© Springer-Verlag London 2013

Authors and Affiliations

  1. 1.Oxendon SoftwareMarket HarboroughUK

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