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Chair for Dynamics/Mechatronics
ITM Logo

Prof. Wolfgang Seemann
Prof. Carsten Proppe
Prof. Alexander Fidlin


Karlsruher Institut für Technologie (KIT)
Kaiserstraße 10
Gebäude: 10.23, 2. OG
76131 Karlsruhe

Tel:  +49 721 608-42397
Tel:  +49 721 608-42659
Fax: +49 721 608-46070
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Quick guide Dynamics/Mechatronics

Olga Drozdetskaya, M. Sc.

Wissenschaftliche Mitarbeiterin
Room: CS
Phone: +49 721 608-41899
Fax: +49 721 608-46070
olga drozdetskayaIkn6∂kit edu

Karlsruher Institut für Technologie
Institut für Technische Mechanik
Teilinstitut Dynamik/Mechatronik
Postfach 6980
76049 Karlsruhe

Haus- und Lieferanschrift:
KIT-Campus Süd
Institut für Technische Mechanik
Teilinstitut Dynamik/Mechatronik
Geb. 10.23, 2.OG
Kaiserstraße 10
76131 Karlsruhe

Self-balancing of the planetary moving rotor

Unbalanced rotor on the rigid carrier

The phenomenon of self-balancing of rigid rotors is well known and investigated for rotors with fixed bearings. However, in some technical devices the rotor performs complex motions. An example of such system is a computed tomography scanner. Its anode rotates very fast in the housing of the X-ray tube. At the same time the X-ray tube itself rotates rather slowly around the patient’s body. It is very important for CT scanner to keep the minimal possible level of vibrations in order to obtain good image quality. The objective is to investigate how and to which extent the self-balancing devices can be used for reducing vibrations in a planetary moving rotor.

The model to consieder consists of the rotor of mass M, which is fixed on the end of the regid carrier. The other end of the carrier is elastically suspended with radial spring-dampers of a certain stiffness c and damping b. The carrier rotates around it’s point of suspension with a constant velocity . At the same time the rotor rotates around its symmetry axis with a given velocity ω. Its centre of mass has an offset relative to the rotation axis. Two pendulum balancers of mass m, moment of inertia J and length r are placed on the rotation axis of the rotor.

Contact: Prof. A. Fidlin, O. Drozdetskaya


Nonlinear Dynamics of Gearboxes with flexible friction clutch.
Jehle, G.; Drozdetskaya, O.; Fidlin, A.
2017. Contributions to the foundations of multidisciplinary research in mechanics : papers presented during the 24th International Congress of Theoretical and Applied Mechanics (ITCAM2016), Montreal, Canada, 22-26 August, 2016. Ed.: J.M. Floryan, 210–211, National Research Council Canada, Ottawa
On the Strongly Nonlinear Resonance of a Rotor with a Self-balancing Device.
Drozdetskaya, O.; Fidlin, A.
2017. 24th International Congress of Theoretical and Applied Mechanics (ICTAM) - Contributions to the Foundations of Multidisciplinary Research in Mechanics, Montreal, Canada, 21-26 August, 2016. Vol.: 1. Ed.: J. M. Floryan, 126–127, National Research Council Canada, Ottawa
On the passing through resonance of a centrifugal exciter with two coaxial unbalances.
Drozdetskaya, O.; Fidlin, A.
2018. European journal of mechanics / A, 72, 516–520. doi:10.1016/j.euromechsol.2018.05.018
On the wobbling of friction discs.
Drozdetskaya, O.; Fidlin, A.; Waltersberger, B.
2011. Proceedings of the 7th European Nonlinear Dynamics Conference (ENOC 2011), Rome, Italy, July 24-29, 2011. Ed.: D. Bernardini, 6 S., Sapienza Università di Roma, Roma
Instabilität der gleitenden Fahrzeugkupplungen: Vom analytischen Grundmodell zur Simulation des Gesamtgetriebes.
Fidlin, A.; Drozdetskaya, O.
2011. Schwingungen in Antrieben 2011: 7. Fachtagung, Leonberg, 19. und 20. Oktober 2011, 183–194, VDI-Verl., Düsseldorf
On the minimal model for the low frequency wobbling instability of friction discs.
Fidlin, A.; Drozdetskaya, O.; Waltersberger, B.
2011. European journal of mechanics / A, 30 (5), 665–672. doi:10.1016/j.euromechsol.2011.03.009