本文關(guān)鍵詞：基于DEM法的旋耕刀具耕作過程分析與研究　出處：《河北科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 旋耕機(jī) 旋耕刀 離散元法 動力學(xué)特性 瞬態(tài)靜力學(xué)特性

【摘要】：旋耕刀是旋耕機(jī)的主要工作部件,由于其工況下轉(zhuǎn)速快、瞬時撞擊力大、與土壤接觸時接觸機(jī)理復(fù)雜等原因,直接影響了旋耕機(jī)的旋耕效果、能量消耗、功率分配等重要問題,旋耕刀片長期與土壤接觸,其結(jié)構(gòu)強(qiáng)度也決定了旋耕機(jī)的壽命,因此研究旋耕刀片的動力學(xué)和靜力學(xué)問題具有重要意義。本文以某型旋耕機(jī)的一組旋耕刀片為研究對象,根據(jù)離散元理論,首先建立了土壤的JKR模型,找到了土壤-耕刀的接觸模型的必要參數(shù),并建立了螺旋機(jī)的三維模型和找到旋耕機(jī)的相關(guān)參數(shù)。其次,探索不同粘結(jié)鍵能量土壤模型的耕作效果和耕刀的受力情況,確定適宜的粘結(jié)鍵能量模擬土壤,并改進(jìn)耕刀形狀,探究不同耕刀形狀下的耕刀的受力狀況。再次,針對耕刀在耕作過程中的運(yùn)動情況復(fù)雜的問題,使用DEM與多體動力學(xué)軟件耦合,對耕刀處在不同粘結(jié)鍵土壤情況下和不同形狀的耕刀耕作情況進(jìn)行了耦合仿真,得到了耕刀在相關(guān)工作條件下的角速度、角加速度、扭矩輸出等動力學(xué)參數(shù),通過對比分析耕刀運(yùn)動狀況,對耕刀改進(jìn)提出合理建議。最后,利用原型耕刀在DEM仿真時刀具的受壓力情況,將刀具的受力信息提取,導(dǎo)入到有限元軟件行進(jìn)耕刀的有限元仿真,得到了耕刀在工況下位移、應(yīng)力、應(yīng)變等主要信息,并根據(jù)位移、應(yīng)力、應(yīng)變等信息對耕刀的結(jié)構(gòu)改進(jìn)提出合理建議。文章以離散元理論中的JKR模型中顆粒具有粘結(jié)鍵能量適宜仿真土壤為理論基礎(chǔ),通過探究耕刀在不同粘結(jié)鍵能量的土壤耕作情況和不同形狀耕刀的工作情況等問題,對耕刀耕作效果、耕刀受力、耕刀的動力學(xué)狀況、耕刀的靜力學(xué)狀況等方面進(jìn)行了深入的研究,利用研究結(jié)果提出了合理的改進(jìn)建議。文章的研究成果不僅適用于旋耕刀具,更對工程土方機(jī)械、掘進(jìn)機(jī)械、礦山機(jī)械等機(jī)械結(jié)構(gòu)的優(yōu)化改進(jìn)具有指導(dǎo)性意義,具有廣闊的應(yīng)用前景。
[Abstract]:Rotary tillage knife is the main working part of rotary tiller. Because of its fast rotation speed, large instantaneous impact force and complicated contact mechanism with soil, it has a direct impact on rotary tillage effect and energy consumption of rotary tiller. Power distribution and other important problems, rotary tilling blade contact with the soil for a long time, its structural strength also determines the life of rotary tiller. Therefore, it is of great significance to study the dynamics and statics of rotary tiller blades. In this paper, a group of rotary tilling blades of a certain type of rotary tiller is taken as the research object. According to the discrete element theory, the JKR model of soil is first established. Found the necessary parameters of the soil-tillage knife contact model, and established the three-dimensional model of the screw machine and found the relevant parameters of the rotary tiller. Secondly. To explore different bond energy soil model tillage effect and force situation of tillage knife, determine the suitable bond energy to simulate the soil, and improve the shape of tillage knife. Thirdly, aiming at the complex movement of tiller in the process of tillage, we use DEM and multi-body dynamics software to couple. The coupling simulation of tillage tool in different bond soil and different shape tillage is carried out, and the dynamic parameters such as angular velocity, angular acceleration and torque output are obtained. By comparing and analyzing the movement of the tiller, the paper puts forward some reasonable suggestions for the improvement of the tiller. Finally, the force information of the tool is extracted by using the pressure of the tool when the prototype tiller is simulated by DEM. The finite element simulation of the tiller is introduced into the finite element software, and the main information of displacement, stress, strain and so on under the working condition are obtained, and according to the displacement and stress. Based on the JKR model of discrete element theory, the bond energy of particles is suitable to simulate the soil. Through probing into the tillage condition of different bond energy in soil and the working condition of different shape tillage knife, the effect of tillage knife, the force of tillage knife and the dynamic condition of tiller knife were studied. In this paper, the statics of the tiller is studied in depth, and the reasonable improvement suggestions are put forward by using the research results. The research results of this paper are not only suitable for rotary tillage tools, but also for engineering earthmoving machinery and tunneling machinery. The optimization and improvement of mining machinery and other mechanical structures is of guiding significance and has broad application prospects.
【學(xué)位授予單位】：河北科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：S222.3

【參考文獻(xiàn)】

相關(guān)期刊論文 前9條

1 李博;陳軍;黃玉祥;;機(jī)械與土壤相互作用的離散元仿真研究進(jìn)展[J];農(nóng)機(jī)化研究;2015年01期

2 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(nóng)業(yè)工程學(xué)報;2013年10期

3 趙麗梅;陳倫軍;張大斌;李屹;羅瑜;;反擊式破碎機(jī)轉(zhuǎn)子的動力學(xué)分析[J];礦山機(jī)械;2012年10期

4 李艷潔;林劍輝;徐泳;;圓錐指數(shù)儀貫入沙土試驗的離散元法模擬[J];農(nóng)業(yè)機(jī)械學(xué)報;2011年11期

5 孫鵬;高峰;李雯;姚圣卓;弓永濤;;圓錐貫入過程的離散元仿真[J];農(nóng)業(yè)機(jī)械學(xué)報;2009年01期

6 李雯;高峰;賈陽;孫鵬;;深空探測車單輪牽引性能的離散元仿真[J];北京航空航天大學(xué)學(xué)報;2008年05期

7 焦紅光;趙躍民;;篩面上顆粒運(yùn)動的計算機(jī)仿真研究及試驗驗證[J];礦冶;2006年01期

8 魯軍,張楚漢,王光綸,金峰;巖體動靜力穩(wěn)定分析的三維離散元數(shù)值模型[J];清華大學(xué)學(xué)報(自然科學(xué)版);1996年10期

9 王泳嘉,劉國興,邢紀(jì)波;離散元法在崩落法放礦中應(yīng)用的研究[J];有色金屬;1987年02期

相關(guān)會議論文 前1條

1 王泳嘉;;離散單元法——一種適用于節(jié)理巖石力學(xué)分析的數(shù)值方法[A];第一屆全國巖石力學(xué)數(shù)值計算及模型試驗討論會論文集[C];1986年

相關(guān)碩士學(xué)位論文 前1條

1 白鵬偉;液壓挖掘機(jī)工作裝置動力學(xué)特性的研究[D];太原科技大學(xué);2013年

，

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