电梯系统共振失效的灵敏度研究  

Resonance failure sensitivity for elevator system

作　　者：冯文周[1,2,3] 曹树谦[1,2] 赵峰[1,2] 胡铖[4] 刘文波 

机构地区：[1]天津大学机械工程学院力学系,天津300072 [2]天津市非线性动力学与混沌控制重点实验室,天津300072 [3]奥的斯电梯(中国)有限公司,天津300457 [4]大连理工大学机械工程学院,辽宁大连116024

出　　处：《振动与冲击》2015年第1期165-170,共6页Journal of Vibration and Shock

基　　金：天津市自然科学基金重点项目(11JCZDJC25400)

摘　　要：以曳引式电梯为研究对象,考虑电梯曳引绳刚度具有时变特性,对电梯系统建立了8自由度耦合振动的动力学模型。在对系统进行模态分析的基础之上,以影响系统模态频率的动力参数作为随机变量,结合DOE试验方法与神经网络技术,得出系统随机变量与系统模态响应之间的显性函数关系式。依据动态结构系统的固有频率与激振频率差的的关系准则,定义了系统共振的失效模式,并对系统的随机变量进行了可靠性灵敏度分析。研究表明,绳头侧刚度和曳引机支撑刚度对频率共振影响最为明显,因此,在电梯系统设计中可以通过修改该动力参数达到有效降低共振的风险。同时,在实际工作中应该严格关注和监视该动力参数的变化,避免发生共振。Taking the traction type elevator as the research object,and considering the time-varying characteristics of traction rope stiffness when the elevator is in normal working condition,an eight degrees of freedom dynamic model of coupled vibration was established for studying the vertical vibration characteristics of the elevator system and the effect of sensitivity of natural frequency on the vibration of elevator system.On the basis of modal analysis on the elevator system, dynamic parameters impacting on the system modal frequency were selected as random variables.Combining the design of experiment （DOE ）test method and artificial neural network （ANN）technology,an explicit function was obtained between each random parameter and the modal response of elevator system.According to the criterion that the absolute value of the difference between the natural frequency of the dynamic structure system and the excitation frequency should not be in excess of an allowance,the failure mode of system resonance was defined,and the reliability sensitivity of the elevator system was studied.The results reveal that the termination stiffness of the traction rope and the isolation pad of traction machine are prominent factors for system resonance.In practice,the risk of resonance can be mitigated effectively by modifying these parameters.Simultaneously,the changes of these dynamic parameters should be strictly monitored to prevent resonance in working process.

关 键 词：电梯振动 共振 失效灵敏度 神经网络 

分 类 号：TU857[建筑科学]