碾米机主轴系统临界转速的计算  

Calculation of critical speed about rice mill spindle system

作　　者：尹芳[1] 陈德炳 谢健 宋少云[1] 李祖吉[1] 

机构地区：[1]武汉轻工大学机械工程学院,湖北武汉430023 [2]国粮武汉科学研究设计院有限公司,湖北武汉430079

出　　处：《粮食与饲料工业》2015年第6期7-9,19,共4页Cereal & Feed Industry

基　　金：2013年粮食公益性行业科研专项"粮食加工关键主机的数字化设计技术研究"(项目编号:201313012-08)

摘　　要：基于有限元方法对碾米机主轴的临界转速进行了研究。根据碾米机主轴系统结构,确定了转子系统的主要组成部分,并采用二维弹簧-阻尼单元对轴承进行建模。给定0、500、1 000、1 500和2 000r/min 5种工作转速,对转子动力学进行分析,得到了坎布尔图,从而确定了主轴的临界转速为725r/min。这意味着当工作转速达到725r/min附近时,主轴会达到共振状态。因此应当尽量避免主轴在此转速附近工作。如果工作转速超过了此速度,那么在启动时应当尽快通过此转速,以避免较大的振动而引起的零部件的破坏。该方法对于采用有限元方法计算碾米机主轴系统的临界转速有较好的参考作用。The critical speed of the rice mill spindle were calculated using the finite element method .According to the struc-ture of rice mill spindle system ,the main components of rotor system was determined ,and the two-dimensional spring and damping element was used to model the bearing .Given 5 kinds of working speed （0 ,500 ,1 000 and 1 500 and 2 000 r/min） , after the rotor dynamic analysis ,the Campbell diagram was obtained ,thus the critical speed of the spindle was determined as 725 r/min ,which meant that the spindle could reach the resonance state when the speed was 725 r/min .Therefore ,it should be avoided as far as the main axis of the spindle in the vicinity of work .If the speed of the work exceeds this speed ,the speed should be passed as soon as possible ,so that the damage of the parts caused by the vibration could be avoided .The critical speed calculation method for rice mill spindle system using the finite element method had a good reference .

关 键 词：碾米机 主轴系统 临界转速 坎布尔图 有限元方法 

分 类 号：TS212.3[轻工技术与工程—粮食、油脂及植物蛋白工程]