Influence of elasticity of unbalance drive in vibration machines on its oscillations

Authors

DOI:

https://doi.org/10.15587/1729-4061.2018.133922

Keywords:

vibration machine, unbalance vibration exciter, drive oscillations, elastic coupling, Sommerfeld effect

Abstract

The dynamics of the vibration machine with unbalance vibration exciter taking into account the elasticity of its connection with the asynchronous motor is studied.

The expression describing torsional oscillations of the elastic coupling in the steady (near-steady) operation of the vibration machine and the formula of the vibratory moment for the machine with plane oscillations of the working body are obtained. The amplitude-frequency characteristics of oscillations of the vibration machine drive using “soft” and “rigid” elastic couplings are constructed. It is shown that resonant oscillations can arise in the vibration machine drive. The nature of changes in the magnitude of the vibratory moment (additional dynamic load on the motor caused by oscillations of both the bearing body of the vibration machine and the elastic coupling), depending on the vibration exciter speed is determined. It is shown that the presence of the elastic coupling in the vibration machine drive in certain operation modes can lead to an increase in the motor load and promotes the appearance of the Sommerfeld effect during start-up. Critical frequencies of the vibration machine drive with unbalance vibration exciter are specified. Recommendations on the choice of natural frequencies of the drive in order to avoid resonant oscillations are formulated.

By means of computer simulation, the emergence of resonant torsional oscillations of the vibration machine drive during the passage of the natural frequency region and the associated manifestation of the Sommerfeld effect are demonstrated. The effectiveness of the proposed recommendations for reducing drive oscillations is confirmed.

The results obtained will allow avoiding resonant oscillations in the vibration machine drive, thereby reducing the dynamic loads in the elements of its design and increasing the reliability and durability of the drive parts

Author Biographies

Nikolay Yaroshevich, Lutsk National Technical University Lvіvska str., 75, Lutsk, Ukraine, 43018

Doctor of Technical Sciences, Professor

Department of Industrial Machinery Engineering

Ivan Zabrodets, Lutsk National Technical University Lvіvska str., 75, Lutsk, Ukraine, 43018

Postgraduate student

Department of Industrial Machinery Engineering

Sergii Shymchuk, Lutsk National Technical University Lvivska str., 75, Lutsk, Ukraine, 43018

PhD, Associate Professor

Department of Industrial Machinery Engineering

Tetiana Yaroshevich, Lutsk National Technical University Lvivska str., 75, Lutsk, Ukraine, 43018

PhD, Associate Professor

Department of Commodity Research and Examination in the Customs Field

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Published

2018-10-30

How to Cite

Yaroshevich, N., Zabrodets, I., Shymchuk, S., & Yaroshevich, T. (2018). Influence of elasticity of unbalance drive in vibration machines on its oscillations. Eastern-European Journal of Enterprise Technologies, 5(7 (95), 62–69. https://doi.org/10.15587/1729-4061.2018.133922

Issue

Vol. 5 No. 7 (95) (2018): Applied mechanics

Section

Applied mechanics

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Copyright (c) 2018 Микола Павлович Ярошевич

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