What is Centrifugal Pendulum Absorber and its Functions?

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Centrifugal Pendulum Absorber:

A centrifugal pendulum absorber is a form of a Tuned mass damper. It reduces the amplitude of a Torsional vibration in drive trains that use a combustion engine.

 

History:

The centrifugal pendulum absorber was first patented in 1937 by R. Sarazin and a special version by R. Chilton in 1938. Generally, both Sarazin and Chilton are credited with the invention. Sarazin’s work was used during war II by Pratt & Whitney for aircraft engines with increased power output. The ability increase caused a rise in torsional vibrations which threatened the sturdiness. This resulted in the Pratt & Whitney R-2800 engine that used pendulum weights attached to the crankshaft.

The use of centrifugal pendulum absorbers in land vehicles didn’t start until later. Although burning engines had always caused torsional vibrations within the drive train, the vibration amplitude was generally not high enough to affect durability or driver comfort. One application existed in tuned racing engines where torsional crankshaft vibrations could cause damage to the camshaft or valves. During this application, a centrifugal pendulum absorber, the Rattler absorber, is directly attached to the crankshaft. Although the planning differs from that of Sarazin or Chilton, the Rattler still follows the identical physical principle.

 

Function:

The function of a centrifugal pendulum absorber is like any tuned mass absorbers supported an absorption principle instead of a damping principle. Excellence is critical since dampers reduce the vibration amplitude by converting the vibration energy into heat. Absorbers store the energy and return it to the vibration system at an acceptable time. Centrifugal pendulum absorbers like tuned mass absorbers don’t seem to be a part of the force/torque flow.

The centrifugal pendulum absorber differs from the tuned mass absorber within the absorption range. It’s effective for a whole order rather than a narrow frequency range.

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