华南农业大学学报2016，Vol.37Issue(4)：105-111,7.DOI:10.7671/j.issn.1001-411X.2016.04.017
树枝直刃剪切数学模型与试验
Development and verification of a mathematical model of straight blade cutting longan branches
摘要
Abstract
[Objective]To model the process of straight blade cutting longan branches based on material mechanics and elastic foundation beam theory, and to calculate the shearing force of branches from the straight blade cutting using the model. [Method]Shixia longan branches were used as test materials. The mechanical parameters of the branches and the coefficient of friction between the branch and blade were measured using a universal material test machine and a custom friction tester. The peak shearing forces were measured by the universal material testing machine and also calculated by the developed model un-der conditions of different branch moisture contents ( M) , branch diameters ( d) and blade bevel angles (θ) . The blade used in the cutting tests had a bevel angle of 10 ° , 20 ° or 30 ° .[Result]When M=76%, d=20. 4 mm and θ=20 ° , the calculated curve showed the same trend as the curve derived from the ex-perimental results, and the error of the peak shearing force was around 2. 3%. When d=15. 3 mm,θ=20° and M >30% which was the fiber saturation point, the peak shearing force increased with the incre-ment of M and calculated values were within the error ranges of the experimental data. When M=76%, d=24. 6 mm and θ increased from 10 ° to 30 ° , the peak shearing force increased significantly and the calculated values were also within the error ranges of the experimental data.[Conclusion]The model can be used to estimate the shearing force and investigate the effects of different mechanical parameters on the peak shearing force. The results will provide theoretical reference for the design and optimization of prun-ing machines.关键词
数学模型/直刃刀片/剪切/含水率/刃角,龙眼树枝/弹性地基梁理论Key words
mathematical model/straight blade/shear/moisture content/bevel angle/longan branch/elastic foundation beam theory分类
农业科技引用本文复制引用
王慰祖,吴良军,杨洲,陆华忠,汪刘一,郭晓伶..树枝直刃剪切数学模型与试验[J].华南农业大学学报,2016,37(4):105-111,7.基金项目
广州市科技计划项目(2014J4100147) （2014J4100147）
现代农业产业技术体系建设专项(nycytx-32) （nycytx-32）
