On the Dynamics of an Enhanced Coaxial Inertial Exciter for Vibratory Machines

Theoretical investigations into the capabilities of a coaxial inertial drive with various operating modes for vibratory conveyors and screens are conducted in the paper. The coaxial inertial exciter is designed with one asynchronous electric motor and the kinematically synchronized rotation of two unbalanced masses. Three variants of angular speeds ratios, namely omega(2)/omega(1) = 1, omega(2)/omega(1) = -1, and omega(2)/omega(1) = 2, are considered. Based on these relations, the circular, elliptical, and complex motion trajectories of the working members are implemented. In the first two cases, single-frequency harmonic oscillations take place. In the latter case, the double-frequency periodic oscillations are excited. The dynamic behavior of the motor's shaft during its running-up and running-out is considered. The influence of the inertial parameters of the unbalanced rotors and the relative phase shift angle between them on the elliptical trajectories of the vibratory system's mass center motion is investigated. The use of forced kinematic synchronization provides the motion stability of the vibratory system for all considered working regimes.

Automated summary

Theoretical investigations are conducted on the capabilities of a coaxial inertial drive for vibratory conveyors and screens with various operating modes. The drive is designed with one asynchronous electric motor and the rotation of two unbalanced masses. Different angular speed ratios are considered, resulting in circular, elliptical, and complex motion trajectories. The dynamics of the motor's shaft during running-up and running-out are considered, along with the influence of inertial parameters and phase shift angle on the motion trajectories. The forced kinematic synchronization ensures motion stability for all working regimes.