Mutual influences of foundation vibrations of three giant centrifuges and the effectiveness of split vibration isolation

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (14) : 1-7.

GUO Dechang，NIE Baisong，WANG Hongzhen，HUANG Wei

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Abstract

A large-scale equipment mainly includes three giant centrifuges, namely a heavy-duty machine, a high-speed machine, and a model machine. The equipment foundation is located in a soft soil foundation pit. The vibration problem of the basic structure cannot be ignored as the rotating speed of the high-speed machine is 668r/min, and the maximum capacity of the heavy-duty machine is 1900g•t. In order to study the vibration interaction between multiple foundations, a three-dimensional coupling model of centrifuge foundation + basic structure is established based on finite element software, and the dynamic time history method is used to calculate and analyze the vibration response of each mainframe under operating conditions; And then the effectiveness of split joint vibration isolation is studied based on multiple split joint optimization schemes. The results show that: (1) The vibration displacement amplitude of its own foundation is the largest when the model machine is running. (2) The heavy-duty machine has the most significant impact on the vibration of adjacent units when it is running, and the vibration transmission ratio to the adjacent foundation reaches 63% for the high-speed machine and 72% for the model machine. (3) The vibration impact on adjacent units will attenuate as the distance from the vibration source increases. (4) Under the condition that the ground connecting wall is surrounded, the vibration isolation efficiency of the joints between the three foundations is not outstanding. From the comparison of the vibration response, no joints between the three units are a relatively better solution.
Key words: foundation; centrifuge; vibration response; joint isolation; design optimization

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foundation / centrifuge / vibration response / joint isolation / design optimization

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GUO Dechang，NIE Baisong，WANG Hongzhen，HUANG Wei. Mutual influences of foundation vibrations of three giant centrifuges and the effectiveness of split vibration isolation[J]. Journal of Vibration and Shock, 2022, 41(14): 1-7

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