Dynamical Analysis On Anti-resonance Horizontal Vibration Centrifuge Based On Mass

Anti-resonance horizontal vibrating centrifuge (Double-body nonlinear anti-resonance horizontal vibrating centrifuge) is a new and high efficient dewatering centrifuge that designed according to dynamic damping principle. It has widely been used in coal-cleaning factories for dewatering the middles and fine coal owing to its advantages such:low energy consumption, high efficiency, high capacity etc.. In the present study, effect of material factors on the dynamics characteristic of the double-body antireson horizontal vibrating centrifuge was investigated systematically and completely.A dynamic model of antiresonance horizontal vibrating centrifuge was established under the condition of no-load, constant load, linearly changed load and impact load. Its dynamic characteristic under different condition was analyzed. The effect of centrifuge’s parameters on its dynamic characteristics was investigated. Results showed that:(1) The machine has two resonance points when the frequency ratio (λ) equals to0.45or1.35, λ=1is the best working point;(2) The amplitude of upper body and lower body increases linearly with the increases of the mass load;(3) The stiffness of the lower body has no much affect on the amplitude of the machine, while the amplitude of the machine depends on the stiffness of the upper body.(4) The best work bandwidth of the machine is reduced when endures impact load.(5) The high the anti-resonance ratio and the mass ratio of the upper body and lower body, the small the amplitude of machine. The machine will perform very well when with low small damping ratio of the upper body and with high damping ratio of the lower body. The mass ratio of the load and upper body has little effect on the dynamics characteristic of the machine. The best work bandwidth becomes narrow when the static displacement increases.(6) a group of parameters (α=3,μ=0.5,ξ=0.12,ξ=0.05,ε=0.2, b=0.01) can be obtained. The amplitude-frequency of the upper body has no much change, while the best work bandwidth of the lower body increases by200%, the amplitude decreases by50%, and the machine perform very well.Simulation was carried out for the operation behavior of the antiresonance horizontal vibrating centrifuge under the condition of no-load, changed load, constant load, and impact with Simulink software. The method was explored with which the machine performance can be improved. Results showed that:(1) The amplitude of double body increases when the mass of the load increases linearly or when impact occurs. Further more, the amplitude of the lower body changes more than that of the upper body.(2) The performance of machine can be improved, the amplitude of the lower body can be reduced and the amplitude of the upper body can be increased by decreasing the damp of the upper body, by uniformizing the frequency of the electromotor and the upper body by adjusting the speed of the electromotor.