变频振动下料机构的模态分析及误差建模  

Modal Analysis and Error Modeling for Variant Frequency Vibration Cropping Mechanism

作　　者：王振伟[1] 赵升吨[1] 张永[1] 张立军[1] 

机构地区：[1]西安交通大学,西安710049

出　　处：《中国机械工程》2007年第9期1009-1012,共4页China Mechanical Engineering

基　　金：国家自然科学基金资助项目(50375117)

摘　　要：变频振动下料机构是变频振动系统的重要执行部件，其激振频率直接影响制造质量和生产效率。采用有限元法分析了变频振动下料机构的振动模态，获得了下料机构的动态特性，确定了振动下料的变频范围为10～30Hz。为控制下料机构的变频振动误差，判断分析结果和试验数据的有效性，阐述了误差的推导过程，获得了误差方程，建立了半径为√2δ的三圆柱相贯的误差模型。进行了变频振动下料试验，试验结果表明，在该变频范围内可获得良好的断面质量，且下料机构的运动参量与误差模型符合。Cropping mechanism is a key component for variant frequency vibration cropping, and its excited frequency directly affects manufacturing quality and production efficiency. Through modal analysis by using Finite Element Method, dynamic characteristics of cropping mechanism were obtained firstly. Then, the optimum excited frequency range of 10～30Hz was determined. Secondly, in order to control vibration error and to evaluate the validity of analysis results and experimental data, the derivation process of error was discussed in detailed. Furthermore, error equation was established. Consequently, error model constructed by the intersecting part of three cylinders with the radius of √2δ was proposed, where δ was error limit. Finally, experimental results show that manufacturing quality is higher when excited frequency is within above optimum frequency range, and vibration parameters are in good agreement with error model.

关 键 词：变频振动下料 模态分析 激振频率 误差模型 有限元法 

分 类 号：TG301[金属学及工艺—金属压力加工]