平架推土机履带行走系统仿真与行走架分析

发布时间：2018-06-04 03:08

本文选题：履带推土机 + 行走系统　；参考：《吉林大学》2013年硕士论文

【摘要】：履带推土机是一种自行式铲土运输机械，广泛应用在国民基础建设与国防建设等实际工程中，是一种较为典型的工程机械机种。同时履带式推土机可以适应多种不同的路面条件，其附着性能较好，可以发挥出更大的牵引力。作为履带推土机主要的系统，行走系统要承担着整车重量，而且在车辆行驶过程中，要缓冲来自地面对整车的冲击，这导致行走系统成为整车中故障率最高的系统之一。因此对行走系统的研究有着迫切的需求。首先，本文介绍了履带式推土机行走系统的各个组成机构及其强度的理论计算方法，主要包括“四轮一带”和张紧缓冲装置及悬挂系统；并对行走系统履带接地压力分布情况进行了分析；对行走系统牵引力及运行阻力的产生原因及其大小进行了计算；同时还对行走系统转向进行了运动和受力分析，这些研究为以后的动力学仿真和有限元分析提供了依据。本文以缩短履带推土机行走系统研发周期，降低研发成本为目的；利用Recurdyn软件，对履带推土机的各个工作工况进了行动态性能仿真分析。仿真研究结果说明，该履带推土机在各个工况的负重轮受力均不相同，且不均匀，这对履带及推土机的性能都有重要影响。同时驱动轮受力最大时出现在推土机打滑时。另外讨论了履带板宽度和履刺高度对整车滑转率的影响，发现适当的增加履带板宽和履刺高可以减小因履带滑转损失的功。本文分析得出的结果，对于类似车型的研发和改进有一定的借鉴意义。同时本文根据履带推土机具体使用过程中，行走系统最易发生破坏的行走架进行了受力分析，在有限元分析中，为避免因边界加载过程中导致的人为偏差，而采取对整机进行加载，然后重点关注行走架的受力结果。在加载时选择了该履带推土机正常最大工作载荷与行走架受力极端工况两种情形。分析结果表明，在极端工况下，行走架斜支撑的局部应力偏大，，可能会发生结构破坏，建议加大此处的壁厚。
[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.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU623.5

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