Harmonic Damper

Harmonic Damper

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A harmonic damper is a device fitted the free (accessory drive) end of the crankshaft of an internal combustion engine. It is essential in engines with long crankshafts (such as straight-8 engines) and is present on most engines as it reduces torsional vibrations that tend to peak at certain speeds. Without the presence of a damper a long crankshaft will tend to act as a torsional spring to some extent. Impulses applied to the crankshaft by the connecting rods will tend to "wind" this spring, which will respond (as a spring-mass system) by unwinding and re-winding in the opposite direction. This will usually be damped out naturally, but at certain crankshaft rotational speeds the impulses from the cylinder firing can be in synchronization with the natural resonant frequency. (Some aircraft engines are restricted from continuous operations at specific RPM to avoid the danger of metal fatigue causing a break in the crankshaft.)
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Product details

  • Paperback | 92 pages
  • 152 x 229 x 6mm | 145g
  • Commun
  • United States
  • English
  • 6136715155
  • 9786136715155