基于ANSYS的9RS-2型秸秆揉丝机锤片机构模态分析  

Modal analysis on the hammer mechanism of 9RS-2 straw kneading machine based on ANSYS

作　　者：任连志 戴飞[1] 路宗尧 郭亚兵[1] 张涛[1] 张锋伟[1] 

机构地区：[1]甘肃农业大学工学院,甘肃兰州730070

出　　处：《甘肃农业大学学报》2015年第4期141-145,共5页Journal of Gansu Agricultural University

基　　金："十二五"国家科技支撑计划项目"西北绿洲农牧循环技术集成与示范"(2012BAD14B10);干旱生境作物学重点实验室开放基金项目(GSCS-201209)

摘　　要：针对秸秆揉丝机在工作过程中振动显著的缺陷，对9RS-2型秸秆揉丝机锤片机构采用Solidworks2012建立三维模型并运用ANSYS有限元方法进行模态分析，提取前10阶固有频率和模态振型，验证了锤片机构受迫旋转振动下的激振频率76Hz小于低阶模态频率578Hz，锤片机构不会因质量偏心产生共振．研究表明，圆盘在各阶模态中振动相对较大，因此对圆盘进行改进，将其厚度由原设计的3mm增至41mm，以增大其刚度，改善工作稳定性．对改进后的结构进行模态分析．结果表明：改进后2～10阶固有频率增加，各阶模态振动形式基本不变，相对位移量减小，振动降低，优化效果明显．研究同时为秸秆揉丝机的进一步振动分析（如谐响应分析、谱分析等）提供了参考依据．Aimed at the defect of the serious vibration of the hammer mechanism in working process, the three- dimensional model of the hammer mechanism of 9RS-2 straw kneading machine was made by the software Solid- works2012, and modal analysis of this mechanism was done by the software ANSYS to get its first ten order natural frequency and mode shapes. The excitated frequency （76 Hz） caused by the rotation of central axis was less than the lowest natural frequency （578 Hz） showed that the resonant vibration would not happened in working speed. As the research showed, the displacement of the disk was relatively large in each mode, we thickened the disk from 3 mm to 4 turn so that the stiffness of disk would be stronger and the stability of the mechanism would be im- proved. The modal analysis of the optimized hammer mechanism showed that the second to ninth natural frequency have been improved in some d,gree while each mode shape was roughly same to its original shape, the relative dis- placement and the vibration of the mode have been reduced, these results revealed that the optimization effect was notable. The research also provided some reference to the subsequence analyses such as dynamic response analysis and spectrum analysis.

关 键 词：秸秆揉丝机 锤片机构 ANSYS 模态分析 

分 类 号：S226[农业科学—农业机械化工程]