【作者】 白秀超；

【导师】 赵克利；

【作者基本信息】 吉林大学 ， 机械设计及理论， 2012， 硕士

【摘要】 推土机是工程机械的一个主要机种，广泛应用于各种土石方作业。推土机工作条件恶劣，作业工况复杂多变，如何提高其动力性及经济性是推土机企业一直关注的问题。本文围绕某大型履带推土机动力传动系性能优化进行了系统深入的研究，以整车动力传动系统为研究对象，结合推土机的典型作业工况，采用基于Simulink-M文件的编程方法，实现动力传动系统合理匹配与优化。本文主要研究内容如下：1.综述了高驱动履带推土机国内外的发展状况和结构特点，介绍了液力机械传动匹配技术研究的主要内容及开发手段。2.根据经典理论以及前人提出的经验公式和研究方法，建立了整机动力传动系统匹配的数学模型；在分析各部分传动特点的基础上，采用面向对象建模方法，在Simulink/Simdriveline环境下建立了发动机、液力变矩器、行星变速箱、中央传动和终传动仿真模型；同时针对推土机的工作条件和驾驶员行为特点建立了路面外界环境和驾驶员模型；提出了推土机作业的两种典型工况，分别为推土工况和松土工况，并考虑了两种工况推土机的工作阻力和地面附着状况。3.在参考大量文献的基础上，对推土机动力传动系匹配的评价方法、评价指标进行了分析和总结，并给出推土机整机优化的方法，即以推土机综合评价指标φ为目标函数，将被分析模型中的变矩器有效直径和整机重量参数化，基于Simulink-M文件的编程方法，最终确定一组使整机综合评价指标φ达到最大的变矩器有效直径与整机重量的组合。4.对优化前后推土机整机性能进行对比分析。优化后结果表明，推土机在铲掘、运土和松土阶段主要性能指标得到了改善，推土机的动力性和燃油经济性得到一定程度的提升，优化方法对推土机整机动力传动系的设计有一定的借鉴意义。同时基于工程应用软件的前期虚拟设计及性能试验，即可预测整机在不同工况下的综合性能，各传动部件参数化的虚拟设计，可缩短产品研发周期，降低开发成本，具有较好的实际应用价值。更多还原

【Abstract】 Bulldozer is a main kind of construction equipments, which is widely used in earthand rock works. Bulldozer’s working condition and operating mode are abominable, sohow to improve the power performance and fuel economy of the bulldozer is the issue thatthe bulldozer manufacturers most care for all the time. Combined with typical operatingconditions and based on Simulink-M file union programming method, this paper conductsthe thorough research to powertrain performance optimization, it realizes reasonable matchand optimization of the powertrain system on a large crawler bulldozer. The main contentsof this article are as follows:1.This paper summarizes the development status and structural characteristics of thehigh-drive bulldozer at home and abroad, the main research contents and developmentmeans are also introduced in accordance with the matching technology of the hydro-mechanical transmission.2.According to the classical theory as well as predecessor’s empirical formulas andresearch method, a matching mathematical model of the powertrain system on the wholemachine is established. On the basis of the analysis of the transmission characteristics, theengine, torque converter, planetary gearbox, central transmission and final drive model arebuilt with object-oriented modeling technology in Simulink/Simdriveline environment.Meanwhile, the pavement external environment and driver model are established aiming atthe bulldozer’s working conditions and driver behaviour. Two typical operating conditionsof the bulldozer are put forward, which are bulldozing condition and scarificationcondition, the working resistance and ground adhesion status of the two conditions areconsidered in this paper.3.Based on lots of documents and efforts, an optimized method of the bulldozer’spowertrain is proposed according to the analysis and summary of the matching evaluationmethod and index. Namely based on Simulink-M file programming method with thecomprehensive evaluation index φ as objective function, the converter effective diameterand vehicle weight are parameterized in the analytical simulation model in order to achieveoptimal combination.4.In the end, the dissertation compares the performance of the optimized bulldozerwith the original. The optimization results show the main performance index of thebulldozer at the stages of the shovel, earthmoving and scarification, as well as the powerperformance and fuel economy of the bulldozer are improved to a certain degree, there is much for reference of this optimized method to the powertrain design of the bulldozer.Meanwhile, this Simulink model can forecast the comprehensive performance of thebulldozer under different conditions according to previous virtual design and test by usingengineering application software, the transmission’s parametric virtual design can shortenthe period and cost of product development, and has practical application value in someextent.更多还原