基于模态试验和灵敏度分析的振动流化床弹簧约束修改  

Constraint modifi cation of spring of vibrative fl uidized bed based on modal test and sensitivity analysis

作　　者：李珺[1] 刘初升[1] 王秀[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：《矿山机械》2014年第1期88-91,共4页Mining & Processing Equipment

基　　金：国家自然科学基金资助项目(51134022);高等学校博士学科点专项科研基金资助项目(20120095110001);江苏省普通高校研究生科研创新计划项目(CXLX12_0949)

摘　　要：针对振动设备弹簧约束仿真时的简化模型误差较大的问题,提出一种基于灵敏度分析和模态试验的弹簧约束简化模型的修正方法。利用振动系统的灵敏度理论计算了前6阶固有频率对于各支点的弹簧约束等效刚度的灵敏度值,并对每一阶固有频率较为敏感的弹簧约束分别进行了修改。将修改前后的系统固有频率与模态试验获得的固有频率对比,发现修改后的前2阶固有频率误差有显著的降低,说明修改后的等效约束模型与实际约束更为接近。To reduce the large error of simplified simulation model of spring constraint for the vibrative equipment, a modification method for the simplified model of spring constraint was put forward based on modal test and sensitivity analysis. The sensitivity theory of the vibrative system was applied to calculate the sensitivity of equivalent stiffness of spring constraint at each point at natural frequencies of six preceding orders, and the spring constraints sensitive to natural frequency of each order were modified separately. After the contrast of the system natural frequency before and after modification with the one obtained from the modal test, it was found that the error of natural frequencies of preceding two orders reduced remarkably after modification, which indicated the modified equivalent constraint model was closer to actual constraints.

关 键 词：振动流化床 模态试验 灵敏度分析 动力学修改 

分 类 号：TH135[机械工程—机械制造及自动化]