摘要
为使结构轻量化,对旱地果园深松机机架进行有限元分析及优化。对深松刀切削土壤的过程进行运动仿真分析获得最大深松阻力,通过力学分析计算确定机架受力情况。在Workbench中进行机架极限载荷强度分析,得到机架所受最大应力为67.8MPa,未达到材料许用应力117.5MPa,验证了机架工作的可靠性,且存在较大应力裕度。选用响应面优化法对机架进行优化设计,将机架质量及后悬挂托钩钢管前端应力作为目标函数,构建机架优化数学模型。基于Box-behnken试验设计原理,选取17组试验模型进行仿真试验,采用最小二乘法对试验结果进行响应面拟合;以最小质量及应力不超过110MPa为约束条件进行优化求解,得到最优参数组合,其优化后机架应力值为89.8MPa,质量为53.2kg。通过实地试验进行验证,3次试验测得其应力平均值为78.3、77.7、79.4MPa,与仿真误差均不超过13%,验证了优化数学模型的准确性。优化结果表明:在保证机架工作可靠性的前提下,机架质量由62.2kg减少到50.1kg,降幅19.4%,减重效果明显,达到了优化目标。
In order to lighten the structure,the frame of subsoiler in dryland orchard was analyzed and optimized by finite element method.The maximum subsoiling resistance is obtained by motion simulation analysis of the process of subsoiling knife cutting soil.The stress of the frame is determined through mechanical analysis and calculation.The ultimate load strength analysis of the frame is carried out in the workbench.It is obtained that the maximum stress of the frame is 67.8MPa,which does not reach the allowable material stress of 117.5MPa.It is verified that the reliability of the frame work and there is a large stress margin.In this paper,the response surface optimization method is used to optimize the design of the frame.Taking the frame mass and the front-end stress of the steel pipe of the rear suspension hook as the objective function,the frame optimization mathematical model is constructed.Based on the box Behnken test design principle,17 groups of test models are selected for simulation test,and the least square method is used to fit the test results.Taking the minimum mass and stress no more than 110MPa as constraints,the optimal parameter combination is obtained.After optimization,the stress value of the frame is 89.8MPa and the mass is 53.2kg.Through field experiments,the average values of stress measured in three experiments are 78.3MPa,77.7MPa and 79.4MPa,and the simulation error is no more than 13%,which verifies the accuracy of the optimized mathematical model.The optimization results show that on the premise of ensuring the working reliability of the rack,the weight of the rack is reduced from 62.2kg to 50.1kg,with a decrease of 19.4%.The weight reduction effect is obvious,and the optimization goal is achieved.
作者
孟子锐
杨蹈宇
张立强
廖凯
郭鹏程
罗红
龚宏彬
侯振宇
Meng Zirui;Yang Daoyu;Zhang Liqiang;Liao Kai;Guo Pengcheng;Luo Hong;Gong Hongbin;Hou Zhenyu(Mechanical and Electrical Engineering Institute,Central South University of Forestry and Technology,Changsha 410004,China)
出处
《农机化研究》
北大核心
2023年第9期20-28,共9页
Journal of Agricultural Mechanization Research
基金
湖南省重点研发计划项目(2019NK2022)。
关键词
深松机
机架
有限元分析
轻量化设计
响应面优化
subsoiler
frame
finite element analysis
lightweight design
response surface optimization
作者简介
孟子锐(1997-),男,湖南岳阳人,硕士研究生,(E-mail)754352840@qq.com;通讯作者:杨蹈宇(1964-),男,湖南邵阳人,高级工程师,硕士生导师,(E-mail)yangdy923@163.com。
