Dynamic Absorbers for Modern Powertrains 2011-01-1554
This paper describes the use of dynamic vibration absorbers in torque converters to reduce the torsional vibration levels of the vehicle drivetrain. The use of both tuned mass absorbers and centrifugal pendulum absorbers (CPA) are discussed. In the case of the tuned mass absorber, the absorber is tuned near the lugging limit of the torque converter clutch to provide maximum improvement in isolation at low speed where vibration levels generally are the highest. The CPA is tuned for the dominate firing order of the engine, thus tracking the engine excitation at all operating speeds. Vehicle measurements are presented for both absorber types compared to current state of the art torque converter isolator technology.