本文選題：履帶推土機 + 行走系統(tǒng)��； 參考：《吉林大學》2013年碩士論文

【摘要】：履帶推土機是一種自行式鏟土運輸機械，廣泛應用在國民基礎(chǔ)建設(shè)與國防建設(shè)等實際工程中，是一種較為典型的工程機械機種。同時履帶式推土機可以適應多種不同的路面條件，其附著性能較好，可以發(fā)揮出更大的牽引力。 作為履帶推土機主要的系統(tǒng)，行走系統(tǒng)要承擔著整車重量，而且在車輛行駛過程中，要緩沖來自地面對整車的沖擊，這導致行走系統(tǒng)成為整車中故障率最高的系統(tǒng)之 一。因此對行走系統(tǒng)的研究有著迫切的需求。 首先，本文介紹了履帶式推土機行走系統(tǒng)的各個組成機構(gòu)及其強度的理論計算方法，主要包括“四輪一帶”和張緊緩沖裝置及懸掛系統(tǒng)；并對行走系統(tǒng)履帶接地壓力分布情況進行了分析；對行走系統(tǒng)牽引力及運行阻力的產(chǎn)生原因及其大小進行了計算；同時還對行走系統(tǒng)轉(zhuǎn)向進行了運動和受力分析，這些研究為以后的動力學仿真和有限元分析提供了依據(jù)。 本文以縮短履帶推土機行走系統(tǒng)研發(fā)周期，降低研發(fā)成本為目的；利用Recurdyn軟件，對履帶推土機的各個工作工況進了行動態(tài)性能仿真分析。仿真研究結(jié)果說明，該履帶推土機在各個工況的負重輪受力均不相同，且不均勻，這對履帶及推土機的性能都有重要影響。同時驅(qū)動輪受力最大時出現(xiàn)在推土機打滑時。另外討論了履帶板寬度和履刺高度對整車滑轉(zhuǎn)率的影響，發(fā)現(xiàn)適當?shù)脑黾勇膸О鍖捄吐拇谈呖梢詼p小因履帶滑轉(zhuǎn)損失的功。本文分析得出的結(jié)果，對于類似車型的研發(fā)和改進有一定的借鑒意義。 同時本文根據(jù)履帶推土機具體使用過程中，行走系統(tǒng)最易發(fā)生破壞的行走架進行了受力分析，在有限元分析中，為避免因邊界加載過程中導致的人為偏差，而采取對整機進行加載，然后重點關(guān)注行走架的受力結(jié)果。在加載時選擇了該履帶推土機正常最大工作載荷與行走架受力極端工況兩種情形。分析結(jié)果表明，在極端工況下，行走架斜支撐的局部應力偏大，，可能會發(fā)生結(jié)構(gòu)破壞，建議加大此處的壁厚。
[Abstract]:Crawler bulldozer is a kind of self-propelled shoveling and transportation machinery, which is widely used in many practical projects such as national infrastructure construction and national defense construction, and is a typical type of construction machinery. At the same time crawler bulldozer can adapt to many different road conditions, its adhesion is better, can play a greater traction. As the main system of crawler bulldozer, the walking system has to bear the weight of the whole vehicle, and in the course of driving, the impact from the ground to the whole vehicle should be cushioned, which makes the walking system become one of the highest failure rate of the whole vehicle. I. Therefore, there is an urgent need for the research of walking system. First of all, this paper introduces each component mechanism and its strength calculation method of crawler bulldozer walking system, mainly including "four-wheel belt", tensioning buffer device and suspension system. At the same time, the paper analyzes the distribution of the earth pressure on the track of the walking system, calculates the causes and the magnitude of the traction force and the running resistance of the walking system, and analyzes the movement and force of the steering of the walking system. These studies provide the basis for the later dynamic simulation and finite element analysis. In order to shorten the research and development period of crawler bulldozer walking system and reduce the cost of research and development, the dynamic performance of crawler bulldozer is simulated and analyzed by using Recurdyn software. The simulation results show that the load-bearing wheel of the crawler bulldozer is different and uneven in each condition, which has an important effect on the performance of the crawler and bulldozer. At the same time, the maximum force on the drive wheel appears when the bulldozer slides. In addition, the influence of the width of track board and height of track on the slip rate of vehicle is discussed. It is found that increasing the width of track board and height of track can reduce the work loss due to track slip. The results obtained in this paper can be used for reference for the development and improvement of similar models. At the same time, according to the concrete use process of the crawler bulldozer, the force analysis of the walking frame, which is the most vulnerable to the damage of the walking system, is carried out. In the finite element analysis, in order to avoid the artificial deviation caused by the boundary loading process, And take the whole machine load, and then focus on the results of the force of the walking frame. The maximum normal working load of the crawler bulldozer and the extreme working condition of the walking frame are selected when loading. The analysis results show that the local stress of the inclined support of the walking frame is too large under extreme working conditions, which may lead to structural failure. It is suggested that the wall thickness should be increased here.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU623.5

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本文編號：1975585