Analysis On The Effect Of Impact Machine Vibration On One-storey Mill Structure

During the recent years, many scholars have been studying the impact effect of machine vibration which occurs on the floor on building structure, but the vibration effect of the impact machine foundation on structure has been neglected. Based on an actual measurement of vibration in a belt drop hammer workshop, the dynamic effect of impact machine vibration on one-storey mill structure is analyzed.As the dynamic load acting on the structure should be determined before structural analysis, the propagation and attenuation of ground vibration is analyzed first in the dissertation, which is based on the actual observation signals. Then, the near-source amplitude attenuation formula under the local field condition is chosen. To obtain a vibration predictor formula which has high engineering applicability, some appropriate assumptions are put forward. A predictor formula is suggested to forecast the vertical vibration at the plinth when several machines are all in work. As long as the excitation is ascertained, the structural dynamic response can be solved according to the motion equations.If dynamic analysis is conducted to every bent in the mill, the workload will be great. Therefore, a worst-bent should be chosen first. By comparing the peak vibration values, it is discovered that the superposition of vibrations can only take the vibrations which has a source distance less than 13.6 meters into account. The peak total acceleration distribution map obtained through the vibration predictor formula can be used to estimate the peak total acceleration of every bent. The bent which has the maximal peak total acceleration is chosen as the analytical structure and the dynamic effect of impact machine vibration on it is studied with ANSYS.