Numerical Simulation Analysis Of Equipment Vibration Isolation

The research on microvibration control indicates that the microvibration control should be realized step-by-step so that the engineering design has the satisfactory effect. In this paper, the microvibration control methods for Hi-Tech facilities has been studied starting with the vibration sources, on the basis of which the corresponding measures are effectively taken against vibration sources, transmit tracks and control objects through numerical simulations for one experiment base. The main conclusions are summarized as bellows:1. The interaction between the foundation and soil is taken into account in the numerical method, which can simulate the actual working mechanism of the dynamic equipment foundation and circumambience soil. Thus, the numerical method has the advantage of more accuracy and reliability over the specification method based on the single mass model.2. The dynamic responses of vibration isolation system for dynamic equipment foundation and soil are simulated, which reveal that the natural frequencies of the structural system gradually increase with the stiffness increase of vibration-isolation equipment so that the vibration of equipment foundation is gradually amplified and the vibration of equipment is correspondingly decreased. The vibration-isolation equipment should be carefully selected according to the vibration isolation requirement and equipment rotate speed so that the vibration of ground soil is reduced with respect to the satisfactory vibration magnitude of dynamic equipment.3. The influences of the circumambience soil on the vibration of dynamic equipment foundation are simulated, which reveal that the circumambience soil has a remarkable effect on the foundation vibration and almost has no effect on the vibration of isolation platform. Therefore, the ground soil should be reinforced to improve the soil stiffness for the construction of large-scale dynamic equipment foundation.4. The vibrations of dynamic equipment foundation with the aid of the isolation gouge are simulated, which reveal that the position and depth of the isolation gouge have almost no influence on the vibration mode of the structural system. Therefore, the damping parameters of the whole structural system and attenuation rules of vibration via transmit distance all keep the same. The application of the continuous isolation gouge is effective for the vibration isolation of ground soil with high frequency vibration. However, the amplification effect should be noticed for low frequency.5. The vibration isolation simulations for hi-Tech facilities between foundations are performed. The vibration input for finite element model is assumed by the colleted vibration signals in site. The calculated results reveal that the time-history vibrations are smaller than the allowable values. In the frequency domain, the vibration reduced evidently in the frequency range with high vibration energies and the vibration isolation effect is improved with the increase of disturbing frequencies.6. The vibration of high-rise building slab under the simulated wind loads and disturbing forces of...