The dynamics of a vibration machine’s model in the form of a vibroimpact three-mass system with one shock pair, which oscillations are excited by two non-ideal inertial vibration exciters, is considered. The collision of the shock pair elements is modeled on the basis of the classical impact theory. A numerical simulation of the model dynamics at varying the excitation frequency, as well as the parameters of the initial gap and the coefficient of restitution, characterizing the conditions of contact interaction of the machine’s working bodies with the processed material, has been carried out. The influence of these parameters values on the frequency range of stable synchronization of vibration exciters and stable periodic vibroimpact modes of the system motion has been established. It is shown that at the same excitation frequency, a change in these parameters can lead to a change in the periodicity of the vibroimpact mode and the working bodies’ oscillations mode from synchronous-antiphase to practically synchronous-inphase.
Oscillations of a system of three solids with piecewise-linear characteristics of the elastic element between the bodies on which unbalanced vibration exciters of limited power are installed are considered in the paper. The modes of oscillations of the system near the second resonant frequency are analyzed. It is shown that intermittent interaction between system elements leads to a change in the dynamic characteristics of the system, including a change in the frequency range of stability of anti-phase synchronization of debalance rotation.
This paper proposes one of the possible schemes of realization of the debalance for an inertial vibration exciter of a resonant vibrating machine that can automatically change the amplitude of the disturbing force by changing the eccentricity and, thus, maintain the required characteristics of the vibration process (vibration velocity, vibration acceleration, etc.) as the mass of technological load and, consequently, resonant frequency of the system changes.
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