摘要
针对收割机割台框架容易产生疲劳现象,对割台框架进行了疲劳寿命分析.建立了割台框架有限元模型,求解出割台框架模态频率与振型;测取割台框架平整路面与田间路面两种典型路面不同工况下的载荷,根据雨流计数法编制成载荷谱;结合材料属性进行了疲劳寿命计算.研究结果表明：割台框架的疲劳寿命大小主要与应力幅值有关,应力幅值越大疲劳损伤值越大疲劳寿命越低;割台框架寿命约为2545h ,低于收获机械一般疲劳寿命水平;针对疲劳强度薄弱部位后壁上横梁采用局部加厚4mm,经计算改进后疲劳寿命约为2.196 ×10^1h ,疲劳强度符合要求.
As an important support frame of the cutting ta b le , the cutting table frame is prone tofatigue failure. For this problem,fatigue life analysis was carried out for cutting table frame. The finite element model of cutting table frame was built. The modal frequency and vibration mode of the cutting frame were worked out. The load on the cutting frame during running on the flat road and worfield was measured,and load spectrum was compiled based on the rain flow counting method. The fatigue life was calculated by combining material attribute. The result of analysis shows that the fatigue life of the cutting table frame mainly depends on the stress amplitude. The higher the stress amplitude is,the bigger the fatigue damage and the lower the fatigue life. The fatigue life of cutting table frame is about 2545 hours,lower than fatigue life of general harvest machinery. To improve the fatigue strength , the weakpart （i. e. upper beam on the rear wall） is thickened for 4mm. The improved fatigue life is about 2. 196X 104 hours,which meets the requirements.
出处
《浙江理工大学学报（自然科学版）》
2016年第5期720-725,共6页
Journal of Zhejiang Sci-Tech University(Natural Sciences)
基金
国家自然科学基金项目(51375459)
关键词
割台框架
模态分析
载荷谱
疲劳分析
cutting table frame
modal analysis
load spectra
fatigue analysis
