摘要
为优化自行研制的一体式烟秆拔秆破碎机质量及作业功耗,探究随机振动对整机疲劳寿命的影响,采用基于遗传算法的多目标优化、振动试验和基于功率谱密度(PSD)的随机振动疲劳计算等方法对机架进行轻量化设计和疲劳寿命分析。首先通过振动试验获得典型测点的加速度功率谱密度,再将其作为随机振动载荷添加到有限元中进行随机振动响应分析,最后计算出该载荷机架的疲劳寿命。结果表明,优化后使机架的在保证结构强度的基础上质量减轻19.6%,当随机振动频率为47.814 Hz时,机架的功率密度谱最大响应值为6.66e-7 m~2/Hz,随机振动载荷下烟秆拔秆破碎机的振动疲劳寿命约为3.65年。
In order to optimize the quality and power consumption of the integrated smoke stalk pull-out crusher,and explore the influence of random vibration on the fatigue life of the machine,multi-objective optimization based on genetic algorithm,vibration test,and random vibration fatigue calculation based on power spectrum density(PSD)were adopted to carry out lightweight design and fatigue life analysis for the frame.Firstly,PSDs of accelerations at typical test points were gained through the vibration test and then added in the finite element for random vibration response analysis as the random vibration loads.Finally,the fatigue life of the frame under the load was calculated.The results showed that after optimization,the mass of the frame decreased by 19.6%,with structural strength guaranteed.When the random vibration frequency was 47.814 Hz,the maximum response value of frame PSD was 6.66 e-7 m~2/Hz.Under random vibration load,the vibration fatigue life of tobacco stalks pulling and crushing machine was about 3.65 years.
作者
杨桃月
顾苑婷
舒成松
曹阳
张大斌
Yang Taoyue;Gu yuanting;Shu Chengsong;Cao Yang;Zhang dabin(College of Mechanical and Electrical Enginering,Guizhou Vocational and Technical College,Gutyang,550023,China;Bijie Vocational and Technical College,Bijie,551700,China;School of Mechanical Engineering,Gnizhou University,Guiyang,550025,China)
出处
《中国农机化学报》
北大核心
2021年第5期100-106,共7页
Journal of Chinese Agricultural Mechanization
基金
贵州省科技支撑计划资助项目(黔科合支撑[2016]2038)
贵州省科技计划资助项目(黔科合平台人才[2019]5616号)
贵州省研究生教育教学改革重点课题(黔教合YJSCXJH[2018]010)。
关键词
烟秆拔秆破碎机
轻量化设计
功率谱密度
振动试验
疲劳寿命
tobacco stalk pulling and crushing machine
lightweight design
PSD
vibration test
fatigue life
