Exciters of Two Frequency Oscillations in Which the Rolling Elements are Accelerated by Rolling Resistance Forces
DOI:
https://doi.org/10.32515/2414-3820.2026.56.233-242Keywords:
vibrating machine, resonance, technological process, screen, vibrating screen, rolling resistance, inertial vibrator, rolling without slippingAbstract
Dual-frequency vibration exciters operating on the Sommerfeld effect are proposed, in which rolling bodies in the form of balls or rollers are accelerated by rolling resistance forces. The vibration exciters consist of a housing with an annular cavity with a raceway and a hole for mounting on the shaft, an unbalanced mass mounted on the housing, and rolling bodies mounted inside the annular cavity with the ability to roll on the raceway. The vibration exciter housing is mounted on the shaft of an electric motor. The electric motor with the vibration exciter is mounted on an elastically-viscous fixed platform, the vibrations of which are excited. The proposed devices operate as two independent inertial vibration exciters, one of which is resonant. Faster super-resonant vibrations are excited by the unbalanced mass on the vibration exciter housing, which rotates synchronously with the electric motor shaft. The mass is small, which ensures acceleration of the shaft to a given angular speed of rotation. Slower but intense near-resonant vibrations excite the rolling elements, which get stuck at a frequency slightly lower than the resonant frequency due to the Sommerfeld effect. Due to the acceleration of the rolling elements by the rolling resistance forces, stable near-resonant vibrations arise that do not depend on the speed of rotation of the vibration exciter housing. An increase in the rolling resistance forces brings the rolling element jamming frequency closer to the resonant frequency. Fast vibrations depend on the speed of rotation of the housing and therefore can be controlled by changing the speed of rotation of the vibration exciter housing using a frequency converter. Technical solutions are proposed to increase the rolling resistance forces. A practical method for determining the rolling resistance coefficient is proposed, which is implemented in conditions that are as close as possible to the operating conditions of the vibration exciter. This ensures the proper accuracy of determining the coefficient. The installation itself has a simple design, and conducting tests on it is not laborious. The proposed devices are applicable for use in vibrating machines of wide purpose - screens, vibrating screens, vibrating tables, vibrating drums, etc., which can be both single-mass and multi-mass.
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Copyright (c) 2026 Gennadiy Filimonikhin, Volodymyr Pirogov, Andrii Hrechka, Denys Gerasymovych
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