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A semi‐active isolator for torsional vibrations
Author(s) -
Ineichen L.
Publication year - 2008
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.200810889
Subject(s) - isolator , torque , control theory (sociology) , actuator , vibration isolation , spring (device) , filter (signal processing) , vibration , damping torque , engineering , rest (music) , computer science , control engineering , direct torque control , mechanical engineering , control (management) , physics , acoustics , electrical engineering , voltage , artificial intelligence , induction motor , thermodynamics
Modern combustion engines produce strong rotational vibrations which could damage elements of the drive train such as the gearbox. A solution to this problem is to mount an isolating device on the output side of the motor. Its function is to filter the torque oscillations to deliver a clean averaged torque to the rest of the drive train. Passive systems have limitations, so that the design of such systems is always a compromise between the effectiveness of the isolation and maximal transmittable average torque. We propose a semi–active system that includes a degressive spring and a hydraulic actuator which can filter effectively the vibrations even if the average torque is high. This isolator is adaptive and doesn't need any command. The stability of this system of the third order is analysed with an averaging method. This leads to some considerations about the design of the control valve of the hydraulic actuator. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)