摘要
塔设备的固有频率和相应振型由塔结构、材料特性、流动载荷以及约束等条件共同决定。当塔的振动频率与固有频率相同时将诱发共振,危害塔的正常工作。选取某石化企业的板式塔作为研究对象,在设计工况下分别采用传统理论的折算质量法与Workbench多物理场求解平台提供的流固耦合计算方法,对塔设备进行结构计算、模态分析和谐响应分析。其中流固耦合算法先对内部流场进行气液两相流稳态计算,然后对塔体进行静力结构计算,载荷条件有重力以及通过流固耦合界面施加到塔体的流动压力,计算得到了不同塔板数的塔结构位移、应力、固有频率及其振型等结果和规律。采用模态叠加法对板式塔进行了谐响应分析,得到了内部流动载荷对塔设备动响应的影响规律,为设备的安全运行提供技术支持。
The natural frequency and the corresponding vibration modes of the tower equipment are determined jointly by the structure,material properties,flow loads and constraints of tower equipment.When the vibration frequency of the tower is the same as the natural frequency,the tower will resonate,endangering its normal operation.A plate tower was selected as the research object and two methods were used to perform structural calculation,mode analysis and harmonic response analysis of the tower equipment.One of the two methods is the conversion mass method based on the traditional theory,the other is the fluid fluid-structure coupling algorithm provided by the Workbench multiphysics platform.The calculation of steady gas-liquid two-phase flow was conducted on the internal flow field and then the static structure of the tower was calculated by the fluid-structure coupling algorithm.The load conditions include gravity and flow pressure applied to the tower through fluid-structure coupling interface.Through calculations,the results and rules of the tower with different number of plates,such as the displacement,stress,natural frequency and vibration mode of the tower structure were obtained.The harmonic response analysis was conducted on the plate tower by the modal superposition method,and the influence law of internal flow load on the dynamic response of the tower equipment was obtained,which provides technical support for the safe operation of the equipment.
作者
汪文锋
黄思
郭晨光
郭嘉炜
叶伟文
李茂东
Wang Wenfeng;Huang Si;Guo Chenguang;Guo Jiawei;Ye Weiwen;Li Maodong(Guangzhou Special Pressure Equipment Inspection and Research Institute,Guangzhou 510663,China;School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510641,China)
出处
《压力容器》
北大核心
2019年第11期19-24,5,共7页
Pressure Vessel Technology
基金
国家自然科学基金项目(21878102)
广东省质监局科技项目(2017CT27)
关键词
塔设备
流固耦合
折算质量法
模态分析
谐响应分析
tower equipment
fluid-structure coupling
conversion mass method
natural frequency
harmonic response analysis
