碟式离心机转鼓筒体的动态可靠性研究  

Study on Dynamic Reliability for Drum Body of Disc Centrifuge

作　　者：郑明亮 Zheng Mingliang(School of Mechanical and Electrical Engineering,Huainan Normal University,Huainan,Anhui 232038,China;School of mechanical and electrical engineering,Taihu University of Wuxi,Wuxi,Jiangsu 214064,China)

机构地区：[1]淮南师范学院机械与电气工程学院,安徽淮南232038 [2]无锡太湖学院机电工程学院,江苏无锡214064

出　　处：《化工设备与管道》2024年第3期59-63,共5页Process Equipment & Piping

基　　金：江苏省绿色过程装备重点实验室开放课题基金资助项目(GPE202203);江苏省高校“青蓝工程”优秀青年骨干教师项目(编号:苏教师函[2022]-29号)。

摘　　要：以碟式离心机转鼓为研究对象,建立考虑载荷时间历程和结构参数同为随机性的结构动态可靠性模型,得到转鼓筒体的可靠度和失效率随时间变化规律。首先利用Lagrange方程,建立转鼓与分离物流固耦合关系的解析动力学模型;然后以有限元仿真计算软件为平台,施加流固耦合载荷,采用随机抽样,得到转鼓筒体应力分布的统计特性;最后应用随机过程和应力与强度干涉理论,给出结构动态可靠性的评估指标。结论表明:碟式离心机正常工况下,最大应力集中区发生在沉渣区部位,其等效应力呈现时变正态分布,连续工作2000 h后,转鼓筒体强度满足要求的概率低于80%,寿命符合“浴盆”曲线中早期失效的特征,这为高速碟式分离机的动态优化设计奠定了基础。Taking the Disc centrifuge drum as the research object,the structural dynamic reliability model with considering the randomness of time-varying load and structural parameters is established,and the reliability and failure rate of drum body are obtained.Firstly,the analytical dynamic model considering fluid-structure interaction is established by using Lagrange equations;Then,imposed the fluid-structure coupling load in ANSYS simulation software,and by using random sampling,we obtain the statistical characteristics of the drum body stress distribution;Finally,the evaluation index of structural dynamic reliability is given by using stochastic process and stress-strength interference theory.The results show that:under normal working conditions,the maximum stress concentration area of the Disc centrifuge drum occurs in the sediment area,and its equivalent force presents a time-varying normal distribution.After continuous working for 2000 hours,the probability of drum strength meeting the requirements is less than 80%,and the service life conforms to the characteristics of early failure in the"bathtub"curve,which lays a foundation for the dynamic optimization design of high-speed Disc centrifuge.

关 键 词：碟式离心机 转鼓体 应力和强度 动态可靠性 

分 类 号：TH122[机械工程—机械设计及理论] TH126