On Dynamics of an Electromechanical System Supported by Cylindrical Helical Spring Damped by an Impact Damper

Abstract

This paper focuses on vibrations attenuation of an electromechanical system flexibly coupled with a baseplate by cylindrical helical springs and damped by an element that can work either in inertia or impact regime. The model is constructed with three degrees of freedom in the mechanical oscillating part, two translational and one rotational. The system movement is described by three mutually coupled second-order ordinary differential equations. The nonlinearities that significantly influence behavior of the system are impacts if the impact regime is set on. Several important results were obtained by means of computational simulations. Character of the system motion and amplitude of its oscillations strongly depend on the width of clearances between the damping element and the rotor frame. The damping element operating in inertia regime must have precisely chosen mass and reduces efficiently the oscillations amplitude only in a narrow frequency interval. In contrast, the damping device working in impact regime attenuates vibrations of the rotor frame in a wide range of the excitation frequency and the system is showing periodic, quasi periodic and chaotic movements.