Experimental analysis of the oscillations of two-mass system with self-synchronizing unbalance vibration exciters

In this work the experimental researches of dynamics of a model of a chain-type two-mass oscillatory system with two unbalance vibration exciters are carried out. The method of smooth variation of the debalances speed is used to analyze the amplitude-frequency response of the model. The modes of synchronous rotation of debalances are studied depending on the control parameter – the frequency of the supply voltage. The power characteristics of the electric drive and the influence of the carrying body oscillations on the power consumed by the exciter are established. It is shown that the effect of adaptive self-synchronization of debalances occur in the mechanical system, when the oscillation modes of carrying body vary with the excitation frequency

Adaptive properties of a self-synchronization effect of unbalanced vibroexciters

This paper describes the results of the experimental studies of vibrations of one-mass system on an elastic suspension with two unbalanced vibrators in a wide range of excitation frequencies. The technique of the tests and results analysis is given. The paper shows that in a mechanical system an effect of self-oscillating adaptive self-synchronization of unbalanced masses takes place when changing the vibration forms of the carrier body, depending on the excitation frequency

Simulation of control system for resonant vibrating machines with two unbalanced exciters

Problems related to design of high-performance vibrating machines are described in this paper. For this purpose, numerical simulation of flat solid body oscillations excited by two unbalanced exciters was carried out. The developed model takes into account AC motor characteristics. A control system for automatic resonant tuning under varying system parameters is developed

An algorithm for automatic adjustment of the vibrational technological machine to the resonant regime

The problem of stabilization resonant oscillation of mechanical system excited by unbalanced rotor of an asynchronous AC motor is considered. An algorithm for automatic adjustment of the vibrational technological machine to the resonant regime at changing process loads and/or supply voltage is proposed

On parametric oscillations of pendular and rotor systems

Different kind of parametrical phenomena in vibrating systems are presented. Nonlinear properties of rotating and pendulum dynamical systems give some interesting industrial applications. The purpose of this paper is to show the possibility to generalize the models and to find a similarity of certain physical presentations and possible analysis. The effects of non-uniform rotation of unbalanced rotor, synchronization of multiples pendulums with common vibrating base, stabilization of vertical column, auto parametrical damper etc. are included in consideratio

Comparative analysis of two control algorithms of resonant oscillations of the vibration machine driven by an asynchronous AC motor

In this paper, the problem of automatic tuning of vibration technological machines (e.g. vibrating screens) to resonant mode is considered. The purpose of the study is to develop a control system to provide the initial resonant setup and its control, regardless parameters variations such as operating loads. To achieve this two control algorithms are proposed. The first algorithm is based on linear approximation, while the second one is based on the preliminary analysis of some relations between the system parameters. The advantages and disadvantages of the proposed algorithms are considered and the applicability limitations are determined

On the choice of dynamic regimes for two-mass vibrating machine

In this paper the forced oscillations of the two-mass model of vibrating machine excited by inertial exciter driven by an electric drive of limited power are considered. For given mass of the working body and parameters of its oscillations the relationships between parameters of the machine were established, and the rational dynamic regimes with low energy consumption and low dynamic forces transmitted to its base were defined

Developing system of automatic control resonant mode of a vibrating machine

The paper is devoted to the experimental check of a control algorithm for automatic adjustment of oscillations of a mechanical system to the resonance mode. Oscillations of the system are excited by rotating an unbalanced rotor of an asynchronous electric motor. Working principle of the control system is based on measuring a phase shift between oscillations of the system and an excitation force

Self-synchronization features of inertial vibration exciters in two-mass system

The paper presents the results of experimental analysis features of rotation of two unbalance vibration exciters that excite oscillations of a chain-type two-mass oscillatory system in order to identify stability of synchronous modes of the debalances rotation near the system resonances (in application to analysis of resonant vibrating machines dynamics). Experimentally obtained amplitude-frequency characteristics of the model, velocities and mutual phase shift of rotation of the debalances are analyzed. Areas of stable synchronous rotation of the debalances and types of their self-synchronization are revealed as dependence of both the frequency of voltage supplying to the electric motors and the imbalances value. It is shown that when approaching the resonant frequencies, both the debalances rotational speeds and their mutual phasing appear to be unstable