考虑应力幅值和频率综合作用的深松机疲劳寿命预测  

Prediction of subsoiler fatigue life considering the combined effects of stress amplitude and frequency

作　　者：林玉龙 王宪良 Lin Yulong;Wang Xianliang(School of Mechanical and Electrical Engineering,Beijing Institute of Graphic Communication,Beijing,102600,China;School of Agricultural Engineering and Food Science,Shandong University of Technology,Zibo,255000,China)

机构地区：[1]北京印刷学院机电工程学院,北京市102600 [2]山东理工大学农业工程与食品科学学院,山东淄博255000

出　　处：《中国农机化学报》2025年第3期202-207,245,共7页Journal of Chinese Agricultural Mechanization

基　　金：国家自然科学基金资助项目(32101631);山东省农机研发制造推广应用一体化试点项目(NJYTHSD—202315)。

摘　　要：作为耕作机械,深松机的工作环境相对恶劣,在田间作业过程中机具所受应力具有变幅宽频的特点,传统方法通常适用于以应力幅值为主导、频率恒定或频率变化范围较小的场合,无法很好地预测深松机的疲劳寿命。为解决这一问题,搭建动态应变测试系统,以获取深松机田间作业时危险测试点的应力信号;提出一种同时考虑应力幅值和频率对疲劳寿命影响的新理论——功率密度,建立基于功率密度的疲劳寿命定量分析方法,基于危险点处的应力信号对深松机的疲劳寿命进行计算。计算结果与深松机田间作业无障碍使用时间(1000 h)接近,证明功率密度法的合理性。As a type of tillage machinery,subsoilers operate in relatively harsh environments,and the stress they experience during field operations are characterized by time-varying amplitudes and wide frequencies.Traditional methods are unable to accurately predict the fatigue life of subsoilers.To accurately predict the fatigue life,a dynamic stress collection system is established to obtain stress signals at critical testing points during field operations.A new theory called power density is proposed,which considers the combined effects of amplitude and frequency of stress signals.Based on the theory,a quantitative analysis method for fatigue life is developed,and the fatigue life of the subsoiler is estimated using the collected stress signals.The results are close to the subsoiler's unimpeded operational time(1000 h),confirming the validity of the power density method.

关 键 词：深松机 变幅宽频 疲劳寿命 功率密度 

分 类 号：S222.19[农业科学—农业机械化工程]