华南农业大学学报Issue(3)：105-110,6.
甘蔗切割器系统轴裂纹识别分析
An analysis of crack identification in the shaft of sugarcane cutter system
摘要
Abstract
[Objective]To get identification information of crack on the shaft from vibration characteristics of the system under the condition of various nonlinear factors .[Method] The cutter was simplified to a vertical over-hung rotor-bearing system , and the slant crack was set near the junction between the shaft and the disk , taking into consideration two nonlinear factors .The slant crack and the nonlinear cutting force, three degrees of freedom dynamic equations of the system were founded .Based on this model , a stiffness calculation model of opening slant crack was chosen .The dynamic characteristics of the slant cracked cutter were investigated by numerical simulation .[Result and conclusion] The results showed that whenΩ=500 r· min-1 system was only under the condition of nonlinear cutting force without crack , working frequency and combined frequencies appeared in frequency responses of transverse vibration .In the same working condition , when the system was under the condition of both crack and nonlinear cutting force, the system had working frequency , combined frequencies and also a newly added second harmonic frequency which were frequency responses .In addition , with the increase of the crack depth , the ampli-tude of the second harmonic frequency was also increasing .Therefore , the identification signal of crack can be attained from two nonlinear factors .Besides , in torsional vibration , working frequency newly ap-peared because of the crack .关键词
甘蔗/切割器/斜裂纹/非线性切割力Key words
sugarcane/cutter/slant crack/nonlinear cutting force分类
农业科技引用本文复制引用
魏道高,胡美玲,马倩,区颖刚..甘蔗切割器系统轴裂纹识别分析[J].华南农业大学学报,2014,(3):105-110,6.基金项目
省部共建教育部重点实验室开放基金资助项目（KF200707）；国家自然科学基金 （）
