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Название Upon drive dynamics of vibratory machines with inertia excitation
DOI 10.17580/or.2017.04.09
Автор Blekhman I. I., Blekhman L. I., Yaroshevich N. P.
Информация об авторе

Institute of Problems of Mechanical Engineering of the Russian Academy of Sciences (St. Petersburg, Russia):

Blekhman I. I., Head of Laboratory, Doctor of Physical and Mathematical Sciences, Professor, iliya.i.blekhman@gmail.com


REC «Mekhanobr-Tekhnika» (St. Petersburg, Russia):
Blekhman L. I., Leading Researcher, Candidate of Engineering Sciences, liblekhman@yandex.ru


Lutsk National Technical University (Lutsk, Ukraine):
Yaroshevich N. P., Head of Chair, Doctor of Engineering Sciences, Professor, yaroshevichmp@gmail.com


Drive oscillations of vibratory machines with inertial unbalance vibration exciter are considered in this paper. In this type of machines electric motor shaft is connected with exciter shaft through an element that allows relative shafts offset (elastic coupling, V-belt transmission, cardan shaft). This connection of shafts is specific for vibratory screens, conveyors, feeders and other machines with electric motor installed on immovable foundation and exciter shaft — upon machine vibrating body. It is shown that presence of the shafts connection in question introduces significant specifics into machine drive dynamics. Body of vibratory machine with inertia excitation is usually supported by cushioned antivibration mounts. With that, natural frequencies of machine body on supports are several times lower, than operating frequency of body vibrations. As a result, during start-up and running-out system attains a condition of resonance, followed by violent vibrations, and, sometimes, with insufficient motor power, rotational frequency crawling in the vicinity of relevant natural frequency (Sommerfeld’s effect). These special aspects must be taken into consideration in machines design, in order to avoid a condition of hazardous vibrations both in start-up and steady state operation.
The study was performed on the basis of vibrational mechanics approach and direct motion separation method. The theoretical results are compared with the computerized simulation results. The studies were performed with the aid of the Russian Science Foundation Grant (Project No. 17-79-30056).

Ключевые слова Vibratory machines, inertial vibration exciters, drive dynamics, critical frequencies, Sommerfeld’s effect
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