本文關鍵詞： 旋耕彎刀 旋耕刀輥 幾何參數(shù) 切土性能 數(shù)值模擬　出處：《西南大學》2017年碩士論文　論文類型：學位論文

【摘要】：微耕機主要用于水、旱田耕整、田園管理和設施農業(yè)等耕耘作業(yè),它可以直接用驅動輪軸驅動旋轉工作部件,即刀輥。刀輥是微耕機的耕作部件,即微耕機的刀具。微耕機的作業(yè)質量、操作性、振動和噪音、能量消耗等在很大程度上取決于刀輥的設計制造及其與切土參數(shù)的匹配。刀輥由旋耕彎刀和刀軸組成,彎刀按一定排列方式安裝在刀軸上。旋耕彎刀的正切部和側切部擔負切土工作,其幾何參數(shù)直接影響刀輥及微耕機的工作性能。目前,微耕機刀輥的選型和設計主要基于對傳統(tǒng)耕耘機刀輥幾何和切土參數(shù)的借鑒和改進,依賴于經(jīng)驗和實際試驗。各微耕機生產(chǎn)企業(yè)所配刀輥(主要是旋耕彎刀)的形狀、結構和切土參數(shù)差異較大,整機性能匹配不盡合理,缺乏理論指導。針對微耕機刀輥選型和設計理論的不完善,以及旋耕彎刀參數(shù)設計和選擇標準不完善等問題,本文對旋耕彎刀幾何參數(shù)建模、背角建模和旋耕刀輥排列設計,以及旋耕彎刀和刀輥的動力學仿真切土試驗等關鍵技術進行了研究,設計并優(yōu)化了微耕機刀輥的形狀、結構和切土參數(shù),形成了微耕機最優(yōu)刀具選型和設計方法。本研究能為微耕機刀輥設計和整機性能匹配提供理論依據(jù)。本文的主要研究結果包括:(1)建立了旋耕彎刀參數(shù)化模型和背角數(shù)學模型,在此基礎上研究了正切刃包角與背角的關系,分析了旋耕彎刀彎折角與背角的關系。結果表明,包角和彎折角對背角的影響顯著,都呈正相關,對研究旋耕彎刀切土性能有重要影響。(2)運用有限元分析軟件ANSYS/Workbench對旋耕彎刀進行靜力分析,得到旋耕彎刀受力時的等效應力應變及總變形分布情況,從理論上驗證了基于旋耕彎刀參數(shù)模型優(yōu)化設計的旋耕彎刀的合理性。(3)通過基于SPH算法的仿真切土方法,分析了文中旋耕彎刀的切土性能,以及對比分析了Alpha角對旋耕彎刀切土性能的影響,為研究旋耕彎刀幾何參數(shù)與其切土功耗之間的影響關系提供了理論依據(jù)。(4)對旋耕刀輥進行優(yōu)化設計,得到優(yōu)化旋耕刀輥模型,并通過基于SPH算法的仿真切土方法,對比研究了優(yōu)化旋耕刀輥與傳統(tǒng)旋耕刀輥在切削土壤時動力學性能和能量消耗的差異。結果表明,相對于傳統(tǒng)旋耕刀輥,優(yōu)化旋耕刀輥的切土性能更優(yōu),其切削功率比傳統(tǒng)旋耕刀輥減小10%。(5)對比分析了兩組刀輥的仿真計算功率與估算功率。結果表明,兩者之間的相對誤差較小,說明基于SPH算法的切土仿真用于旋耕刀輥切土性能研究是可行的。
[Abstract]:Micro-tillage machine is mainly used for ploughing work such as water, dryland plowing, field management and facility agriculture. It can drive rotary working parts directly by driving wheel shaft, that is, knife roll, which is the tillage part of micro-tillage machine. The cutting tools of the micro-tillage machine. The working quality, operation, vibration and noise of the micro-tillage machine. The energy consumption depends to a great extent on the design and manufacture of the cutter roller and its matching with the soil cutting parameters. The curved knife is arranged on the cutter shaft in a certain arrangement. The tangent part and the side cut part of the rotary tiller are responsible for cutting soil, and its geometric parameters directly affect the working performance of the cutter roll and the micro-tiller. At present. The selection and design of knife roll of micro-tillage machine is mainly based on the reference and improvement of the geometry and soil cutting parameters of the traditional cultivator tool roll. Depending on experience and practical test, the shape, structure and soil cutting parameters of the knife roll (mainly rotary crochet cutter) of the micro-tiller production enterprises are different greatly, and the performance matching of the whole machine is not reasonable. Lack of theoretical guidance. Aiming at the imperfect selection and design theory of the tool roll of micro-tillage machine, as well as the imperfect design and selection standard of rotary crochet cutter, this paper models the geometric parameters of rotary crochet cutter. The key technologies, such as back angle modeling, roll arrangement design, and dynamic simulation soil cutting test of rotary crochet and cutter roll, are studied. The shape, structure and soil cutting parameters of tool roll are designed and optimized. The optimal tool selection and design method of micro-tillage machine is formed. This study can provide theoretical basis for tool roll design and performance matching of micro-tillage machine. The main results of this paper include: 1). The parametric model and the back angle mathematical model of rotary crochet are established. On this basis, the relationship between the tangential edge angle and the back angle is studied, and the relationship between the bending angle and the back angle of the rotary crochet is analyzed. The results show that the envelope angle and the bending angle have a significant effect on the back angle, both of which are positively correlated. It has an important influence on soil cutting performance of rotary tiller. 2) static analysis of rotary crochet is carried out by using finite element analysis software ANSYS/Workbench. The distribution of equivalent stress, strain and total deformation of rotary curved knife is obtained. The rationality of the rotary crochet based on the optimal design of the parameter model of rotary tiller is verified theoretically. The soil cutting performance of the rotary crochet is analyzed by using the simulation soil cutting method based on SPH algorithm in this paper. The effect of Alpha angle on soil cutting performance of rotary crochet was analyzed. This paper provides a theoretical basis for the study of the relationship between the geometric parameters of rotary tiller and the power consumption of cutting soil. (4) the optimal design of rotary tiller roller is carried out, and the model of rotary tilling cutter roll is obtained. Through the simulation soil cutting method based on SPH algorithm, the difference of dynamic performance and energy consumption between the optimized rotary tiller roller and the traditional rotary tiller roller in cutting soil is compared. Compared with the traditional rotary tiller roll, the soil cutting performance of the rotary tiller roll is better. Its cutting power is 10% less than that of the traditional rotary tiller. (5) the simulation calculation power and the estimated power of the two groups of tool rollers are compared and analyzed. The results show that the relative error between the two groups is relatively small. It is feasible to use the soil cutting simulation based on SPH algorithm to study the soil cutting performance of rotary tiller roller.
【學位授予單位】：西南大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：S222

【參考文獻】

相關期刊論文 前10條

1 梁方;王德成;尤泳;王光輝;張曉明;賀長彬;李帥;;草地破土切根刀具的刃口曲線設計與優(yōu)化[J];中國農業(yè)大學學報;2016年06期

2 牛坡;楊玲;張引航;高博;李云伍;楊明金;;基于ANSYS Workbench的微耕機用旋耕彎刀有限元分析[J];西南大學學報(自然科學版);2015年12期

3 陶景青;董霖;鐘雯;楊杰;劉志偉;劉雄;;旋耕機旱地刀的摩擦磨損性能試驗研究[J];潤滑與密封;2015年11期

4 王金武;王奇;唐漢;周文琪;多天宇;趙藝;;水稻秸稈深埋整稈還田裝置設計與試驗[J];農業(yè)機械學報;2015年09期

5 盧彩云;何進;李洪文;王慶杰;鄭智旗;張祥彩;;基于SPH算法的平面刀土壤切削過程模擬[J];農業(yè)機械學報;2014年08期

6 朱留憲;楊玲;朱超;楊明金;;基于SPH算法的微耕機旋耕切土仿真研究[J];農機化研究;2014年06期

7 夏俊芳;賀小偉;余水生;周勇;;基于ANSYS/LS-DYNA的螺旋刀輥土壤切削有限元模擬[J];農業(yè)工程學報;2013年10期

8 蔣建東;高潔;趙穎娣;Willem Hoogmoed;張憲;;土壤旋切振動減阻的有限元分析[J];農業(yè)機械學報;2012年01期

9 賈洪雷;黃東巖;劉曉亮;王增輝;劉昭辰;馬成林;;耕作刀片在刀輥上的多頭螺旋線對稱排列法[J];農業(yè)工程學報;2011年04期

10 薛子萱;呂新民;唐衛(wèi)衛(wèi);;螺旋刀具土壤切削過程模擬分析—基于ANSYS/LS-DYNA971[J];農機化研究;2011年04期

相關博士學位論文 前2條

1 周葆春;黏土本構建模理論與試驗研究[D];華中科技大學;2007年

2 程濤;粘土的數(shù)值建模與固結問題研究[D];華中科技大學;2006年

相關碩士學位論文 前3條

1 彭彬;微耕機刀輥切土動力學建模及仿真[D];西南大學;2014年

2 朱留憲;基于SPH算法的微耕機旋耕刀有限元仿真與優(yōu)化[D];西南大學;2012年

3 周明;基于有限元法的螺旋型旋耕刀輥橫刀工作機理研究[D];華中農業(yè)大學;2009年

，

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