Vibration process machine retention system in resonant mode of operation

Abstract

Most vibrating process machines operate in the mode of forced oscillations with a far-resonant tuning. This is due to the fact that in frequency ranges far from the resonance zone, the oscillation mode of the machine is weakly sensitive to changes in the technological load and practically does not depend on the nonlinearity of its oscillatory system. But this comes at the cost of irrational use of energy, since there is a lot of reactive power circulating in the system required to overcome inertial forces in resonant and elastic forces in sub-resonance settings. One of the most effective ways to increase productivity and reduce energy consumption is based on the phenomenon of resonance. However, due to the shortcomings of the resonance circuits of modern machines - low stability and complexity of tuning - they are not widely used in production. The research goal is to simplify the method of holding a vibrating technological machine in a resonant mode based on the use of the Kapitza pendulum. This paper discusses the coupling of the dynamic characteristics of the vibrating technological machine and the pendulum, shows the ways of setting the pendulum as the basis of the sensor for monitoring the presence of the resonance mode. The sensor is proposed to be made in the form of a hinged Kapitza pendulum rod located inside the cage. The sensor is mounted on the working body of the machine and vibrates with it. The rod and cage are electrically insulated from each other and connected by conductors to the machine’s control system. When out of resonance, the sensor loses its verticality, tilts towards the cage and completes the electrical circuit. At the same time, the frequency converter of the supply current is switched on in order to restore the resonant mode. When the resonant mode returns, the pendulum rises, loses contact with the cage, and the frequency converter stops.