摘要
某科学装置包括重载机、高速机和模型机三台巨型离心机,主机基础位于软土基坑内,其中高速机转速达668 r/min,重载机最大容量为1900 Gt,基础结构的振动问题不容忽视。为了对多个主机基础间的振动相互影响进行研究,基于有限元软件建立离心机基础结构+地基的三维耦合模型,采用动力时程方法计算分析了各主机运行工况下的振动响应,并基于多个分缝优化方案,研究了分缝隔振的效能。结果表明:模型机运行时其自身基础的振动位移幅值最大;重载机运行时对相邻机组振动的影响最为显著,对相邻基础的振动传递比例分别达到63%和72%;对相邻机组振动影响呈现随与振源距离增大而衰减的趋势;在地连墙包围的条件下,三基础间的分缝隔振效能不突出,从振动响应对比看,三台机组间不分缝是相对较优的方案。
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 foundation and basic structure cannot be ignored as the rotating speed of the high-speed machine is 668 r/min,and the maximum capacity of the heavy-duty machine is 1900 Gt.In order to study the vibration interaction among the multiple foundations,a three-dimensional coupling finite element model of the centrifuge foundation+basic structure was established,and the dynamic time history method was used to calculate and analyze the vibration response of each mainframe under operating conditions.The effectiveness of the split joint vibration isolation was studied with multiple split joint optimization schemes.The results show that:the vibration displacement amplitude of the model machine’s foundation is the largest when the model machine is running;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;the vibration impact of the machine on adjacent units will attenuate as the distance from the vibration source increases;under the condition that the ground connecting wall is surrounded,the vibration isolation efficiency of the split joints between the three foundations is not outstanding.By the comparison of the vibration responses,no split joints between the three units would be a relatively better solution.
作者
郭德昌
聂柏松
王鸿振
黄维
GUO Dechang;NIE Baisong;WANG Hongzhen;HUANG Wei(Huadong Engineering Corporation Limited,Power China,Hangzhou 310000,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2022年第14期1-7,共7页
Journal of Vibration and Shock
基金
中国博士后科学基金(2021M69100)
关键词
主机基础
离心机
振动响应
分缝隔振
设计优化
foundation
centrifuge
vibration response
split joint isolation
design optimization
