{"title":"Experimental study on the sugarcane stubble base-cutting mechanism","authors":"","doi":"10.1016/j.biosystemseng.2024.07.005","DOIUrl":null,"url":null,"abstract":"<div><p>Base-cutting is essential in sugarcane harvesting, and violent collisions between the base-cutter and stalk can cause stubble damage. Therefore, it is necessary to study the base-cutting mechanism to reduce stubble damage. Based on the mechanical analysis method, this study analysed the base-cutting process of sugarcane vascular bundles and stems from fibber and macro perspectives, respectively. In addition, the base-cutting process was simulated based on Discrete Element Method, and field experiments were conducted to validate the analysis results. The tensile length function <em>L (z)</em> of the vascular bundle was derived from a fibber perspective. A mechanical model of the cutting force on the entire stem was obtained from a macro perspective. From the equations, it can be found that the kinematic parameters of the base-cutter have a significant influence on the cutting force. The simulation test revealed that the cutting force increased sharply when the blade was cut into stems, and the maximum cutting force reached 146.9N. Field tests were conducted to explore the relationship between these factors and the stubble damage rate. To decrease the damage rate to a smaller level, the single-factor test results showed that the forward speed of harvester, rotational speed of disc, and cutting depth should be controlled in the range of 0.8–1.4 m s<sup>−1</sup>, 600–1000 r·min<sup>−1</sup>, and 60–120 mm, respectively. The response surface test showed that the order of the effect of each factor on stubble damage was forward speed > rotational speed > cutting depth. The lowest stubble damage rate was 6.20% when the forward speed, rotational speed of disc, and cutting depth were 1.4 m s<sup>−1</sup>, 800 r·min<sup>−1</sup>, and 79.07 mm, respectively. After experimental field verification, the damage rate met the harvesting standard.</p></div>","PeriodicalId":9173,"journal":{"name":"Biosystems Engineering","volume":null,"pages":null},"PeriodicalIF":4.4000,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Biosystems Engineering","FirstCategoryId":"97","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1537511024001582","RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"AGRICULTURAL ENGINEERING","Score":null,"Total":0}
引用次数: 0
Abstract
Base-cutting is essential in sugarcane harvesting, and violent collisions between the base-cutter and stalk can cause stubble damage. Therefore, it is necessary to study the base-cutting mechanism to reduce stubble damage. Based on the mechanical analysis method, this study analysed the base-cutting process of sugarcane vascular bundles and stems from fibber and macro perspectives, respectively. In addition, the base-cutting process was simulated based on Discrete Element Method, and field experiments were conducted to validate the analysis results. The tensile length function L (z) of the vascular bundle was derived from a fibber perspective. A mechanical model of the cutting force on the entire stem was obtained from a macro perspective. From the equations, it can be found that the kinematic parameters of the base-cutter have a significant influence on the cutting force. The simulation test revealed that the cutting force increased sharply when the blade was cut into stems, and the maximum cutting force reached 146.9N. Field tests were conducted to explore the relationship between these factors and the stubble damage rate. To decrease the damage rate to a smaller level, the single-factor test results showed that the forward speed of harvester, rotational speed of disc, and cutting depth should be controlled in the range of 0.8–1.4 m s−1, 600–1000 r·min−1, and 60–120 mm, respectively. The response surface test showed that the order of the effect of each factor on stubble damage was forward speed > rotational speed > cutting depth. The lowest stubble damage rate was 6.20% when the forward speed, rotational speed of disc, and cutting depth were 1.4 m s−1, 800 r·min−1, and 79.07 mm, respectively. After experimental field verification, the damage rate met the harvesting standard.
在甘蔗收割过程中,基部切割是必不可少的,而基部切割器与茎秆之间的剧烈碰撞会造成残茬损伤。因此,有必要研究基部切割机理,以减少残茬损伤。本研究基于力学分析方法,分别从纤维和宏观角度分析了甘蔗维管束和茎秆的基割过程。此外,还基于离散元素法模拟了基切过程,并进行了田间试验以验证分析结果。从纤维角度得出了维管束的拉伸长度函数 L (z)。从宏观角度得出了整个茎干上切割力的力学模型。从方程中可以发现,基部切割器的运动参数对切割力有很大影响。模拟试验表明,当刀片切入茎秆时,切削力急剧增加,最大切削力达到 146.9N。现场试验探讨了这些因素与残茬破坏率之间的关系。单因素试验结果表明,要将破损率降到较小水平,收割机前进速度、圆盘转速和切割深度应分别控制在 0.8-1.4 m s-1、600-1000 r-min-1 和 60-120 mm 的范围内。响应面试验表明,各因素对残茬损伤的影响顺序为前进速度>;转速>;切割深度。当前进速度、圆盘转速和切割深度分别为 1.4 m s-1、800 r-min-1 和 79.07 mm 时,破茬率最低,为 6.20%。经过田间试验验证,破损率符合收割标准。
期刊介绍:
Biosystems Engineering publishes research in engineering and the physical sciences that represent advances in understanding or modelling of the performance of biological systems for sustainable developments in land use and the environment, agriculture and amenity, bioproduction processes and the food chain. The subject matter of the journal reflects the wide range and interdisciplinary nature of research in engineering for biological systems.