电梯系统共振失效的灵敏度研究

发布时间：2018-05-03 05:32

本文选题：电梯振动 + 共振　；参考：《振动与冲击》2015年01期

【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。
[Abstract]:Taking the traction elevator as the research object and considering the time-varying stiffness of the elevator traction rope, the dynamic model of the coupling vibration of the elevator system with 8 degrees of freedom is established. Based on the modal analysis of the system, the dynamic parameters which affect the modal frequency of the system are taken as random variables, combined with the DOE test method and neural network technology. The explicit function relation between random variables and modal response of the system is obtained. According to the relation criterion between the natural frequency and the frequency difference of the dynamic structure system, the failure mode of the system resonance is defined, and the reliability sensitivity analysis of the random variable of the system is carried out. The research shows that the influence of rope head side stiffness and traction machine support stiffness on frequency resonance is the most obvious. Therefore, the risk of resonance can be effectively reduced by modifying the dynamic parameters in elevator system design. At the same time, we should pay close attention to the change of the dynamic parameter and avoid resonance.
【作者单位】：天津大学机械工程学院力学系;天津市非线性动力学与混沌控制重点实验室;奥的斯电梯(中国)有限公司;大连理工大学机械工程学院;
【基金】：天津市自然科学基金重点项目(11JCZDJC25400)
【分类号】：TU857

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