高速履帶式推土機行走系統(tǒng)仿真與履帶板分析
發(fā)布時間：2018-11-10 13:26
【摘要】：推土機是廣泛用于土石方工程中的比較常見的一種工程機械機種。相對于輪胎式推土機,履帶式推土機附著性能好,能適應多種路面環(huán)境,牽引力較大,所以履帶式推土機的應用更加廣泛。履帶行走系統(tǒng)是履帶式推土機的重要組成部分,它不僅是推土機的運動部分,同時也是整個推土機的支撐部分,既承載整機的自重運行時又承受工作裝置的行駛阻力。行走系統(tǒng)性能的好壞直接影響著整機性能的優(yōu)劣,所以本文對高速履帶式推土機的行走系統(tǒng)進行研究分析。首先,本文介紹了履帶式推土機的行駛原理,對履帶行走系統(tǒng)進行運動學分析;并分析履帶與地面的作用關(guān)系,介紹RecurDyn中的地面數(shù)學模型;對行走系統(tǒng)的牽引力及阻力進行理論計算,得出了推土機的最大牽引力和行駛阻力。這些理論分析與計算,為接下來高速推土機行走系統(tǒng)的動力學仿真及履帶板結(jié)構(gòu)分析打下了堅實的理論基礎(chǔ)。其次,利用軟件RecurDyn建立整機的動力學模型,并對其施加約束和定義合適的力學參數(shù)。根據(jù)高速履帶式推土機實際工作環(huán)境,在RecurDyn中建立硬質(zhì)、粘土、干沙三種典型地面模型。針對高速直線行駛和推土作業(yè)循環(huán)兩種典型工況進行整車動力學仿真。仿真結(jié)果表明,該推土機在不同地面不同工況下負重輪受力不同,波動較大。硬質(zhì)、粘土、干沙地面上驅(qū)動輪轉(zhuǎn)矩逐次變大,履帶下沉量也逐次增大,其承載能力依次降低,且驅(qū)動輪轉(zhuǎn)矩隨著工作阻力的增大而增大。在高速直線行駛工況時,觀察駕駛室座椅質(zhì)心在垂直方向的加速度,可知在三種地面上該垂向加速度都小于2倍重力加速度,均在人體舒適加速度范圍內(nèi)。另外通過兩種工況,三種地面條件的仿真分析,得出在干沙路面直線高速行駛時,履帶銷軸受力和履帶板與負重輪Z向接觸力極值最大,最大值分別為83.3kN和52.6kN,這將作為履帶板有限元分析的計算工況和載荷極值。最后,為了更好地了解高速履帶式推土機工作時履帶板的危險區(qū)域,全面掌握履帶在危險工況下的應力分布情況、變形情況,對受力情況比較復雜的履帶板進行有限元分析。根據(jù)之前的動力學分析確定計算工況及約束和載荷,計算結(jié)果表明,履帶板銷軸局部應力較大,但小于所選材料的許用應力,符合安全要求。
[Abstract]:Bulldozer is a kind of construction machinery widely used in earthwork engineering. Compared with the tire bulldozer, the crawler bulldozer has good adhesion, can adapt to many kinds of road environment, and has great traction, so the crawler bulldozer is more widely used. The crawler system is an important part of the crawler bulldozer. It is not only the moving part of the bulldozer, but also the support part of the whole bulldozer. The performance of the walking system directly affects the performance of the whole machine, so this paper studies and analyzes the walking system of the high-speed crawler bulldozer. Firstly, this paper introduces the driving principle of crawler bulldozer, analyses the kinematics of crawler walking system, analyzes the relationship between crawler and ground, and introduces the mathematical model of ground in RecurDyn. The maximum traction and driving resistance of the bulldozer are obtained by theoretical calculation of the traction and resistance of the walking system. These theoretical analyses and calculations lay a solid theoretical foundation for the subsequent dynamic simulation of the high speed bulldozer walking system and the analysis of the crawler structure. Secondly, the dynamic model of the whole machine is established by using the software RecurDyn, and the constraint is imposed and the appropriate mechanical parameters are defined. According to the actual working environment of high speed crawler bulldozer, three typical ground models of hard, clay and dry sand are established in RecurDyn. The whole vehicle dynamics simulation is carried out under two typical working conditions: high speed straight line driving and pushing operation cycle. The simulation results show that the load bearing wheel of the bulldozer fluctuates greatly under different ground conditions. The torque of driving wheel on the ground of hard clay and dry sand increases gradually and the amount of track sinking increases step by step its bearing capacity decreases in turn and the torque of driving wheel increases with the increase of working resistance. The acceleration of the center of mass of the cab seat in the vertical direction is observed under the condition of high speed straight line driving. It can be seen that the vertical acceleration is less than 2 times of the gravity acceleration on the three kinds of ground, and all of them are in the range of comfortable acceleration of the human body. In addition, through the simulation analysis of two working conditions and three kinds of ground conditions, it is concluded that the maximum values of the pedrail pin shaft force and Z contact force between the track board and the load-bearing wheel are 83.3kN and 52.6 KN, respectively, when the dry sand pavement is running at a straight and high speed. This will be regarded as the working condition and load extremum of the finite element analysis of track plate. Finally, in order to better understand the dangerous area of crawler when high-speed crawler bulldozer is working, the stress distribution and deformation of crawler under dangerous working conditions are comprehensively grasped, and the finite element analysis of crawler is carried out. According to the previous dynamic analysis, the calculation conditions, constraints and loads are determined. The calculated results show that the local stress of the pedrail pin shaft is large, but less than the allowable stress of the selected material, which conforms to the safety requirements.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU623.5
本文編號：2322594
[Abstract]:Bulldozer is a kind of construction machinery widely used in earthwork engineering. Compared with the tire bulldozer, the crawler bulldozer has good adhesion, can adapt to many kinds of road environment, and has great traction, so the crawler bulldozer is more widely used. The crawler system is an important part of the crawler bulldozer. It is not only the moving part of the bulldozer, but also the support part of the whole bulldozer. The performance of the walking system directly affects the performance of the whole machine, so this paper studies and analyzes the walking system of the high-speed crawler bulldozer. Firstly, this paper introduces the driving principle of crawler bulldozer, analyses the kinematics of crawler walking system, analyzes the relationship between crawler and ground, and introduces the mathematical model of ground in RecurDyn. The maximum traction and driving resistance of the bulldozer are obtained by theoretical calculation of the traction and resistance of the walking system. These theoretical analyses and calculations lay a solid theoretical foundation for the subsequent dynamic simulation of the high speed bulldozer walking system and the analysis of the crawler structure. Secondly, the dynamic model of the whole machine is established by using the software RecurDyn, and the constraint is imposed and the appropriate mechanical parameters are defined. According to the actual working environment of high speed crawler bulldozer, three typical ground models of hard, clay and dry sand are established in RecurDyn. The whole vehicle dynamics simulation is carried out under two typical working conditions: high speed straight line driving and pushing operation cycle. The simulation results show that the load bearing wheel of the bulldozer fluctuates greatly under different ground conditions. The torque of driving wheel on the ground of hard clay and dry sand increases gradually and the amount of track sinking increases step by step its bearing capacity decreases in turn and the torque of driving wheel increases with the increase of working resistance. The acceleration of the center of mass of the cab seat in the vertical direction is observed under the condition of high speed straight line driving. It can be seen that the vertical acceleration is less than 2 times of the gravity acceleration on the three kinds of ground, and all of them are in the range of comfortable acceleration of the human body. In addition, through the simulation analysis of two working conditions and three kinds of ground conditions, it is concluded that the maximum values of the pedrail pin shaft force and Z contact force between the track board and the load-bearing wheel are 83.3kN and 52.6 KN, respectively, when the dry sand pavement is running at a straight and high speed. This will be regarded as the working condition and load extremum of the finite element analysis of track plate. Finally, in order to better understand the dangerous area of crawler when high-speed crawler bulldozer is working, the stress distribution and deformation of crawler under dangerous working conditions are comprehensively grasped, and the finite element analysis of crawler is carried out. According to the previous dynamic analysis, the calculation conditions, constraints and loads are determined. The calculated results show that the local stress of the pedrail pin shaft is large, but less than the allowable stress of the selected material, which conforms to the safety requirements.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU623.5
【相似文獻】
相關(guān)期刊論文 前10條
1 趙昱東;履帶式推土機的新發(fā)展[J];露天采煤技術(shù);2000年02期
2 錢鞠梅;新型履帶式推土機[J];礦業(yè)快報;2001年19期
3 鄧集成;履帶式推土機故障的分析與排除[J];工程機械與維修;2002年07期
4 孫大剛,連晉毅,賈志絢,梁國慶;履帶式推土機粘彈性懸掛機構(gòu)的開發(fā)研究[J];太原重型機械學院學報;2002年03期
5 劉燕;凱斯3種設備入圍2002年度100佳[J];工程機械與維修;2003年04期
6 郁錄平,張志剛;履帶式推土機的先進技術(shù)[J];筑路機械與施工機械化;2004年08期
7 錢庫;我國履帶式推土機的現(xiàn)狀和發(fā)展方向[J];工程機械與維修;2005年05期
8 張鵬;;卡特彼勒推出兩款升級型履帶式推土機[J];工程機械與維修;2006年11期
9 陳銳;;卡特彼勒在中國推出兩款升級型號的履帶式推土機[J];建設機械技術(shù)與管理;2006年11期
10 趙玉軍;李軍;孫佳琪;;履帶式推土機外觀質(zhì)量淺析[J];建筑機械化;2007年04期
相關(guān)重要報紙文章 前3條
1 霍松;大型履帶式推土機市場前景廣闊[N];中華建筑報;2000年
2 宋仕敏 齊雪嶺;譜寫愚公續(xù)篇的人們[N];中國工業(yè)報;2004年
3 齊雪嶺;創(chuàng)新的關(guān)鍵是擁有核心技術(shù)[N];中國工業(yè)報;2003年
相關(guān)碩士學位論文 前3條
1 賀寧亞;高速履帶式推土機行走系統(tǒng)仿真與履帶板分析[D];吉林大學;2017年
2 王希淑;履帶式推土機行走裝置結(jié)構(gòu)分析與實驗研究[D];山東理工大學;2012年
3 莊競;大型履帶式推土機翻車和落物保護結(jié)構(gòu)設計計算研究[D];山東大學;2005年
，本文編號：2322594
本文鏈接：http://www.sikaile.net/jianzhugongchenglunwen/2322594.html
最近更新
教材專著
