摘要
为研究籽瓜收获和储运环节产生的静载机械损伤问题,对完好籽瓜进行静载压缩破坏损伤试验,研究籽瓜承载压缩时受压位置、硬度、加载速率对籽瓜机械特性和损伤的影响规律。通过单因素试验结果表明,受压位置在0°~90°时,破坏极限、破坏能、损伤体积均呈现逐渐减小趋势;硬度在2.2~2.8 MPa时,破坏极限、破坏能呈现逐渐增大的趋势,而损伤体积呈现逐渐减小趋势;加载速率在30~60 mm/min时,破坏极限、破坏能分别呈现先增大后减小的趋势,存在极值现象,损伤体积呈现先减小后增大的趋势,也存在极值现象。通过多因素响应面试验结果表明,受压位置与硬度的交互作用对破坏极限、破坏能的影响均显著,对损伤体积的影响极显著;受压位置与加载速率的交互作用对破坏极限、破坏能、损伤体积的影响均极显著;硬度与加载速率的交互作用对破坏极限、破坏能的影响均显著,对损伤体积的影响极显著。建立受压位置、硬度、加载速率对试验指标破坏极限、破坏能、损伤体积的回归模型,进行模型验证和参数优化。以破坏极限最大、破坏能最大、损伤体积最小为优化目标,得到最优参数组合:受压位置为52°,硬度为2.8 MPa,加载速率为44 mm/min。建立的模型可为籽瓜机械破坏损伤预测、储运方式选择和低损收获装备的设计提供理论参考和指导。
To study the mechanical damage caused by static load during harvest,storage,and transportation of seed melons,static load compression damage tests were carried out on intact seed melons.The effects of compression position,hardness,and loading rate on the mechanical properties and damage of seed melons were studied.The single-factor test results show that the failure limit,failure energy,and damage volume decrease gradually when the compression position varies from 0°to 90°.When hardness increases from 2.2 MPa to 2.8 MPa,the failure limit and failure energy gradually increase,while damage volume gradually decreases.When the loading rate ranges from 30 mm/min to 60 mm/min,the failure limit and failure energy first increase and then decrease,exhibiting an extreme value phenomenon,while the damage volume first decreases and then increases,also showing an extreme value phenomenon.The results of multi-factor response surface tests show that the interaction between compressive position and hardness,compression position and loading rate,and hardness and loading rate all have significant effects on the failure limit,failure energy,and damage volume.A regression model was established to predict the failure limit,failure energy,and damage volume based on compression position,hardness,and loading rate.The model was validated and optimized.With the objectives of maximizing failure limit and failure energy while minimizing damage volume,the optimal parameter combination was determined as a compression position of 52°,hardness of 2.8 MPa,and loading rate of 44 mm/min.The established model can provide theoretical reference and guidance for mechanical damage prediction,storage and transportation mode selection,and low-loss harvesting equipment design.
作者
唐学鹏
张佳喜
王帅
赵宾宾
Tang Xuepeng;Zhang Jiaxi;Wang Shuai;Zhao Binbin(College of Mechanical and Electrical Engineering,Xinjiang Agricultural University,Urumqi,830052,China;College of Food Science and Pharmacy,Xinjiang Agricultural University,Urumqi,830052,China)
出处
《中国农机化学报》
北大核心
2025年第8期202-209,256,共9页
Journal of Chinese Agricultural Mechanization
基金
新疆维吾尔自治区自然科学基金项目(2020D01B30)。
关键词
籽瓜
静压
损伤
机械特性
破坏极限
seed melon
static pressure
damage
mechanical characteristics
failure limit
作者简介
第一作者:唐学鹏,男,1987年生,甘肃民勤人,硕士,实验师,研究方向为农产品低损收获技术与装备。E-mail:gndtxp@163.com;通讯作者:张佳喜,男,1973年生,陕西榆林人,博士,教授,研究方向为农业工程技术与装备。E-mail:563810112@qq.com。
