大型振动筛弹簧故障识别的自由响应法  

Fault identification for spring of large vibrating screen using free response

作　　者：刘初升[1] 彭利平[1] 王宏[1] 李珺[1] 

机构地区：[1]中国矿业大学机电工程学院,江苏徐州221116

出　　处：《振动工程学报》2013年第4期624-632,共9页Journal of Vibration Engineering

基　　金：高等学校博士学科点专项科研基金(博导类)资助项目(20120095110001)

摘　　要：针对目前研究较少的大型振动筛减振弹簧故障诊断问题,提出了一种利用系统自由振动响应实现弹簧故障识别的方法。在分析传统模型对弹簧故障信息描述不完整的基础上,建立了一种振动筛有阻尼自由振动耦合动力学模型,并对耦合模型相对于传统模型的向下兼容及突变的特性进行了讨论。利用振型叠加法推导了系统自由振动响应的解析表达式,据此得到弹簧故障将引起系统模型突变和振动加强的特性,以此为诊断原理,编程实现了用时域三维条形图和频域三维谱阵来直观定位一故障弹簧和一健康弹簧。最后,对14种弹簧类型故障组合进了实验诊断,结果验证了该方法的可行性。In consideration of the less-studying of fault diagnosis for damping springs of large vibrating screen （LVS）,a diagnostic methodology based on free response was proposed.After analyzing the incapability of describing the whole fault properties of a vibrating screen within traditional models,a coupled dynamic model with damping and free vibration was established,followed by the downward compatibility discussion with the traditional models.Then,the analytic expression of the free vibration response was derived by the mode superposition method,based on which,peculiarities of the dynamic catastrophe as well as the vibration-strengthening were summarized.After that,the associated 3D bar chart in time domain and waterfall spectrum in frequency domain of each clamping plate was adopted to identify locations of a single fault and an error-free spring in an experiment for 14 different type of spring faults.Results finally verified capability of the proposed method for diagnosing the spring fault in a LVS.

关 键 词：故障诊断 大型振动筛 减振弹簧 耦合模型 自由振动响应 

分 类 号：TH165.3[机械工程—机械制造及自动化] TH135