簇生番茄果梗超声切割过程仿真与试验OA北大核心CSTPCD
Simulation and Experiment on Ultrasonic Cutting Process of Clustered Tomato Stems
为揭示超声技术应用于簇生番茄切割采收的机理及优势,比较了簇生番茄果梗材料在常规切割和超声切割中的切割力和去除特性.首先测定了簇生番茄果梗和自制超声切割刀的参数,然后基于Abaqus进行仿真,将果梗纤维化,在宏观和微观仿真中对比常规切割和超声切割过程中的应力及去除机理.最后,自制试验台,通过改变超声切割刀的激振频率、输入电压、切割速度和切割角度进行切割力测定试验并采用响应面法的Box-Behnken进行四因素三水平分析,随后观察果梗断面形貌.结果表明:在自制超声刀工作频率(35～37 kHz)和电压(340～380 V)内,切割速度、角度对切割效果影响最显著,激振频率和输入电压在特定值附近时切割效果最好;在36 kHz、360 V、0.125 cm/s、0°的条件下,仿真中超声切割耗时约为8s,平均最大切割力为0.635 N,相对于常规切割(1.019 N)降低37.7％;试验中超声切割耗时约为5.3 s,所需切割力最大为0.543 N,相较于常规最大切割力(1.017 N)降低46.6％,同时表面粗糙度降低20.9％,试验与有限元仿真的切割力结果误差为8.9％,基本吻合.超声切割可以降低切割力,缩短切割耗时,同时还提高断面质量,减少果梗组织损伤、水分散失,对延长果实保鲜时间具有一定的意义.
In order to reveal the mechanism and advantages of ultrasonic technology in cutting and harvesting clustered tomatoes,the cutting force and removal characteristics of clustered tomato stem materials in conventional cutting and ultrasonic cutting were compared.Firstly,the parameters of clustered tomato fruit stalks and self-made ultrasonic cutting knife were measured,and then the fruit stalks were fiberized based on Abaqus simulation.The stress and removal mechanism during conventional cutting and ultrasonic cutting were compared in macro and micro simulation.Finally,the self-made test bench was used to measure the cutting force by changing the excitation frequency,input voltage,cutting speed and cutting angle of the ultrasonic cutting knife,and the Box-Behnken of response surface method was used to analyze the four factors and three levels,and then the cross-section morphology of the fruit stalk was observed.The results showed that within the working frequency(35～37 kHz)and voltage(340～380 V)of the self-made ultrasonic scalpel,the cutting speed and angle had the most significant influence on the cutting effect,and the cutting effect was the best when the excitation frequency and input voltage were near a specific value.Under the conditions of 36 kHz,360 V,0.125 cm/s,and 0°,the ultrasonic cutting time in the simulation was about 8 s,and the average maximum cutting force was 0.635 N,which was 37.7％lower than that of the conventional cutting(1.019 N).In the experiment,the ultrasonic cutting took about 5.3 s,and the maximum cutting force required was 0.543 N,which was 46.6％lower than that of the conventional maximum cutting force(1.017 N),and the surface roughness was 20.9％lower.The error between the experimental and finite element simulation results was 8.9％,which was basically consistent.Ultrasonic cutting can reduce the cutting force,shorten the cutting time,improve the section quality,reduce the damage of fruit stem tissue and water loss,which was of certain significance to prolong the fruit preservation time.
张军;辛迪;蓝伟科;党柯华;牛子杰;崔永杰
西北农林科技大学机械与电子工程学院,陕西杨凌 712100西北农林科技大学机械与电子工程学院,陕西杨凌 712100||农业农村部农业物联网重点实验室,陕西杨凌 712100
农业工程
簇生番茄果梗超声振动切割有限元去除机理
clusters of tomato stemsultrasonic vibration cuttingfinite elementremoval mechanism
《农业机械学报》 2024 (003)
153-161 / 9
国家自然科学基金联合基金重点项目(U2243235)和陕西省自然科学基础研究计划项目(2021JQ-156)
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