Matching Analysis And Collaborative Simulation On The Powertrain System Of Crawler Bulldozer

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.