Mirny Polytechnic Institute—Branch of the Ammosov North-Eastern Federal University (NEFU) (Mirny, Russia)

I. V. Zyryanov, Doctor of Engineering Sciences, Professor, zyryanoviv@inbox.ru

Irkutsk National Research Technical University (Irkutsk, Russia)

A. A. Iov, Post-Graduate
N. K. Kuznetsov, Head of Department, Doctor of Engineering Sciences, Professor
I. A. Iov, Doctor of Engineering Sciences, Associate Professor

High dynamic loads are the primary cause of failure in the metal structures of working equipment of mining shovels. These loads can be mitigated by modifying the elastic and dissipative properties of the main mechanisms, for example, by incorporating additional elastic damping devices into their design. A new damping device installation scheme for the working equipment of a mining shovel is proposed, in which the force on the damping element is transmitted through a lever mounted under the hoist rope string. A mathematical model of the dynamic behavior of the mechanical system has been developed, taking into account the nonlinear nature of the interaction between the lever mechanism and the hoist rope. The stiffness and damping parameters are synthesized by solving an inverse dynamics problem for a given law of rope force variation, followed by adjustment of the resulting parameters, accounting for the nonlinear nature of the interaction under the condition of equivalent viscous friction forces. This article describes an experimental setup with boom and lever proportions similar to those found on Uralmash excavators. It also presents the results of a study examining the effectiveness of the proposed load reduction method, obtained through numerical modeling and full-scale testing. These results demonstrated satisfactory agreement between the transient processes, confirming their effectiveness and the validity of the dynamic model. It is found that the proposed damping device installation reduces the maximum level of dynamic loads, increases damping in the mechanical system, and can be recommended for the use in excavator equipment.

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