Teilinstitut Dynamik/Mechatronik - Mitarbeiter
Institut für Technische Mechanik

Olga Drozdetskaya, M. Sc.

  • Postanschrift:
    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

Research Topic: Self-balancing of the planetary moving rotor

Bild
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 rigid 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.

The stationary solutions of the system and the passage through the resonanceare are investigated analytically using averaging technique for the strongly damped systems. Analytic results match very well with numeric simulations when the velocity of the planetary motion is sufficiently small.

Contact: Prof. A. Fidlin, O.Drozdetskaya

Publikationen


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

Lehre