The use of the magnetic-liquid effect to reduce static and dynamic imbalance from the moving masses of drive devices

Dynamics, strength of machines, instruments and equipment


Ermakov V. Y.

Moscow Automobile and Road Construction State Technical University (MADI), MADI, 64, Leningradsky Prospect, Moscow, 125319, Russia



While mechanical systems with rotating or moving masses operation, small amplitude vibrations, which cause negative effect on both control system (CS) operation and sensing elements, are being transferred to the spacecraft structure, which may lead to the CS orientation accuracy degradation. This problem can be solved provided that mounting locations of both precision instruments (PI) and moving masses are known. It is required to determine the moments of inertia of the spacecraft elastic structures provided that dynamic requirements depending on the spacecraft angular velocity are fulfilled, and minimize:

- micro vibrations while special spacecraft precision instruments operation;

- functions of static and dynamic imbalance.

A five-degree-of-freedom vibration isolator employing magneto-liquid effect was developed to reduce the effect of the above said factor on the relative movement of the optical path. The experimental results of its mathematical modelling are presented as well. The tests on studying the effect of the cavity height between the permanent magnet enveloped by the magnet liquid and the unit case, as well as the permanent magnet and case materials on the system characteristics; the permanent magnet base area on the system operation effectiveness were conducted. The results of experimental studies of the vibration system with vibration isolator employing magnet liquid effect revealed 5–10 times reduction of absolute linear traversing. The suggested system herewith was recommended for “Spectrum-UV” spacecraft adaptation as a tool for eliminating undesirable micro disturbances created by flywheel-motors.


magnetic fluid, magneto-liquid vibration isolator, electric flywheel, vibration isolator


  1. Ermakov V.Yu., Telepnev P.P. Proektirovanie ustroistv gasheniya kolebanii konstruktsii kosmicheskikh apparatov, Proektirovanie avtomaticheskikh kosmicheskikh apparatov dlya fundamental'nykh nauchnykh issledovanii, Moscow, Izd-vo MAI-PRINT, 2013, pp. 398 - 429.

  2. Ibragimov D.N. Trudy MAI, 2015, no. 87, available at:

  3. Uryupin I.V. Trudy MAI, 2018, no. 100, available at:

  4. Ermakov V.Yu., Savost'yanov A.M., Pronin M.A. Magnitnaya gidrodinamika, 1991, no. 1, pp. 107 - 113.

  5. Lamzin V.A. Trudy MAI, 2016, no. 86, available at:

  6. Malyshev V.V., Starkov A.V., Fedorov A.V. Trudy MAI, 2012, no. 57, available at:

  7. Krikunov M.M. Trudy MAI, 2010, no. 41, available at:

  8. Darnopykh V.V. Trudy MAI, 2011, no. 47, available at:

  9. Joshi S.M., Groom N.J. Modal Damping Enhancement in Large Space Structures Using AMCD's, Journal of Guidance and Control, 1980, vol. 3, no. 5, pp. 477 - 479.

  10. Nikitin S.A., Polezhaev V.I. Fediushkin A.I. Mathematical simulation of impurity distribution in space processing experiments with semiconductors, Advances in Space Research, 1981, vol. 1, pp. 37 – 40.

  11. Fedyushkin A., Borago N., Polezhayev V., Zharikov Ye. The influence of vibration on hydrodynamics and heat-mass transfer during crystal growth, Journal of Crystal Growth, 2005, vol. 275, pp. 1557 – 1563.

  12. Lin G.F., Lan C.E., Brandon J.A. Generalized Dynamic Aerodynamic Coefficient Model for Flight Dynamics Application, 22nd Atmospheric Flight Mechanics Conference and Exhibit, AIAA-1997-3643, New Orleans, 1997.

  13. Anton V. Doroshin. Analysis of attitude motion evolutions of variable mass gyrostats and coaxial rigid bodies system, Int. Journal of Non-Linear Mechanics, 2010, no. 45, pp. 193 – 205.

  14. Or A.C. Dynamics of an Asymmetric Gyrostat, Journal of Guidance, Control Dynamics, 1998, vol. 21, no. 3, pp. 416 – 420.

  15. Hyde T.T., Crawley E.F. H2 Synthesis for Active Vibration Isolation, In Proceedings of the American Controls Conference, June 1995, Seattle, Washington, pp. 3835 - 3839.

  16. Ermakov V.Yu., Efanov V.V., Kuznetsov D.A., Moskatin'ev I.V., Skuridina O.E., Telepnev P.P. Patent na poleznuyu model' RF 166328 F16F 6/00; F16F 9/56, 20.11.2016.

  17. Ermakov V.Yu., Savostianov A.M., Arinchev S.V., Gribkov V.A. Dynamical Characteristics of Magnetic Fluid Vibration Insulator with Defomable Shell Elements, Sixth International Conference on Magnetic Fluids, July 20-24, Paris, 1992, pp.538 - 539.

  18. Ageev R.V., Mogilevich L.I., Popov V.S., Popova A.A. Trudy MAI, 2014, no. 78, available at:

  19. Berezko M.E., Nikitchenko Yu.A., Tikhonovets A.V. Trudy MAI, 2017, no. 94, available at:

  20. Ermakov V.Yu., Savostianov A.M., Yemetz V.V. Investigation of fragments of a ferrofluid hermetic - vibration protection device for large-sized constructions, Journal Sciences of Space and Technology, 1996, no. 2 (1), pp. 99 - 107.

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