Downsizing and downspeeding are currently the major development approaches of the automobile industry to improve fuel efficiency and to reduce emissions. Decreased operational speeds and higher combustion pressures lead to an increase of the excitation of torsional vibrations by the combustion engine. Torsional vibrations in powertrains can cause strength and NVH problems and lower the driving comfort and reliability of the vehicle. Simultaneously, increasing customer demands for operating smoothness and driving performance additionally exacerbate the requirements. Currently the conventional systems for reduction of torsional vibrations, e.g. dual mass fly-wheels, are increasingly reaching their limits. Centrifugal pendulum vibration absorbers are an excellent choice for improving the reduction of torsional vibrations. The operating principle enables tuning to a defined engine order within the whole operating range of the combustion engine. However, conventional centrifugal pendulum absorbers have strong efficiency limitations due to their typical design. Manufacturing deviations can heavily reduce efficiency. Furthermore, problems relating to strength and NVH can arise by the pendulum bodies striking on their deflection limits. In cooperation with the Gear Research Centre - FZG and the Institute of Applied Mechanics of the Technische Universitat Munchen, a centrifugal pendulum absorber has been developed and realized as a vehicle-related prototype assembly. The prototype assembly has been proven successfully through test rig trials. Among other points, the Synchronous Centrifugal Pendulum Absorber (SCPA) is characterized by kinematic coupling of all pendula and improves the above mentioned disadvantages of conventional centrifugal pendulum absorbers.
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