Vibrations in engineering and technology

Aliiev Elchyn – Doctor of Technical Sciences, Senior Researcher, Senior Lecturer Department of Engineering of Technical Systems of Dnipro State Agrarian and Economic University (St. S. Efremova, 25, Dnipro, Ukraine, 49000, e-mail: aliev@meta.ua, https://orcid.org/0000-0003- 4006-8803). 

Chernii Olexandr – PhD student in 133 Industrial mechanical engineering, Senior Lecturer Department of Engineering of Technical Systems of Dnipro State Agrarian and Economic University (St. S. Efremova, 25, Dnipro, Ukraine, 49000, e-mail: sanek20.1984@gmail.com, https://orcid.org/0000-0003-0691-5829).

The article updates the research on optimizing the design and technological parameters of a spiral vibrating feeder for dosing sunflower seeds in automated phenotyping lines. A review of research on optimizing the value of the elevation angle of the vibrating feeder tray is presented. An analytical dependence for determining the limiting elevation angle of the vibrating feeder tray is obtained, which combines the established design and technological and operating parameters of the vibrating feeder: the coefficient of friction of the seeds f on the tray material, the angle of deviation of the inertia force β from the vertical, the amplitude of oscillations A of the bowl and its oscillation frequency ω. It was established that with an increase in the coefficient of friction of the seeds on the vibrating feeder tray, the limiting elevation angle of the tray also increases, and there is also an increase in the limiting angle with a decrease in the circular frequency of oscillations of the vibrating feeder bowl. The condition of self-braking of sunflower seeds on the spiral tray of the vibrating feeder in a stopped state was checked. In the Simcenter Star-CCM+ software package, a DEM model of sunflower seeds was created and numerical simulation of its movement along the vibrating tray was performed. By changing the values of the independent factors: α− the angle of elevation of the chute, ψ− the angle of throw and δ − the angle of inclination of the track axis to the horizontal, a factorial experiment was conducted according to plan 33. An analytical dependence of the change in the angle of elevation of the tray α depending on the values of the seed movement speed V, the throw angle ψ and the angle of inclination of the track axis to the horizontal δ was obtained. It was established that with the range of seed movement speeds along the spiral tray of the vibrating feeder V= 0.019÷0.028 m/s, the specified productivity of the vibrating feeder is ensured. The final value of the angle α was taken to be 2.4°. The calculated design parameters of the vibrating feeder will contribute to the movement of seeds in a continuous mode with an overload coefficient of about one, which will reduce the likelihood of injury to the seed material. The research steps in the plan for studying a spiral vibrating feeder for dosing sunflower seeds include the creation of an experimental sample of a vibrating feeder according to the adopted design and technological parameters and experimentally established actual indicators of the quality of its work using their comparison with theoretical ones, which is necessary to assess the overall accuracy of the study.

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