Abb. 1: Semiaktives Fliehkraftpendel im Antriebsstrang. Fig. 1: Semi-active centrifugal pendulum in power train.
Abb. 2: Campbell Diagramm bei konstanter Drehzahl – Regelung der ersten Ordnung mit einem aktiven System. Fig. 2: Campbell plot at a constant rotational speed – control of the first order with an active system.
In verschiedenen laufenden und abgeschlossenen Projekten werden und wurden Konzepte entwickelt, numerisch untersucht, prototypisch realisiert und messtechnisch validiert. Dabei ist ein großes Repertoire an möglichen Lösungsansätzen zur Reduktion von Torsionsschwingungen entstanden, die sich für verschiedenste Anwendungsfälle eignen. Customer Benefits Semi-active and active systems can significantly improve torsional vibration reduction in power trains of automobiles, ships or machines. Fraunhofer LBF develops systems from the concept to the prototype. A test facility with a combustion engine, electric motors,
adjustable. An adaptive centrifugal pendulum e. g. can adjust
eddy current brakes and excellent measurement equipment
to different excitation orders using a controlled electric
is available.
motor. Active systems in contrast, directly influence vibrations by a closed loop control. An example is a proof mass actuator.
Summary Trends in combustion engine building towards
Fraunhofer LBF has been developing different concepts
higher efficiency and lower emissions, lead to higher torsional
suitable for a vast field of applications.
vibration excitation of powertrains, bringing passive means of vibration reduction to their limits. Semi-active and active systems are being developed to fit future requirements. In semi-active systems the passive effect is made actively
Fraunhofer LBF Annual Report 2012 6 9