Abstract:

A prototype of the universal resonance vibratory machine of wide use has been designed. The base of the vibratory machine is a vibratory table. Elastic supports make it possible for the platform of a vibratory machine, which has three degrees of freedom, to execute three main vibrational motions corresponding to three resonant frequencies. The vibration exciter is shaped in the form of a ball auto-balancer. It is assumed that the balls in the auto-balancer would get stuck at the first resonance shaft rotation velocity. The first form of resonance oscillations would be induced in this case. The vibratory table can be used on its own. In addition, the platform can host attachments with sieves for sifting or separating a loose material, a tumbling container, molds for bricks, slabs, etc. The experimental study has established that the proper choice of the number of plates in the supports, the number and mass of the balls could ensure almost matching dynamic characteristics of the vibratory machine in the configurations including a vibratory table and vibratory separator. At the same time, when the shaft rotates at speeds exceeding the first resonance frequency, the platform executes (almost undisturbed) vertical progressive oscillations. As the shaft’s rotation speed increases, the platform’s oscillation amplitude increases while the frequency practically does not change. If the shaft rotation speed exceeds the first resonance frequency by 15–20 %, the accelerations of the platform become sufficient to form a boiling layer at the surface of the platform. As the shaft’s rotation speed increases, the growth of the amplitude of oscillations slows down, which is due to both the sliding of the balls along the track and the non-linearity of the supports at large deformations.The current study has confirmed the efficiency and versatility of the designed vibratory machine, thereby providing the basis for its further improvement Author Biography Volodymyr Yatsun, Central Ukrainian National Technical University Universytetskyi ave., 8, Kropyvnytskyi, Ukraine, 25006 PhD, Associate Professor Department of Road Cars and Building

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