The Research On Dynamic Characteristics Matching Of D320E High Power Electric Drive Bulldozer

With the rapid development of China’s economic construction,the investment and pace of large-scale infrastructure construction is getting faster and faster,and the demand for high power construction machinery is also increasing quickly,which promotes the rapid development of China’s construction machinery.There are many mechanical connection parts and hydraulic systems in the traditional crawler bulldozer,which occupy a large space in the layout of the whole machine,and the layout of the bulldozer is not compact,moreover,the power output from the engine will be lost through each mechanical connection or hydraulic transmission,which resulted in inefficiency.And oil leakage from the hydraulic part of the bulldozer can cause environmental pollution.In summary,the research of energy-efficient technology for the traditional crawler bulldozers is an urgent task to reduce pollution and improve efficiency.Therefore,it is of great significance to study the electric drive system of crawler bulldozers.D320E high-power electric drive crawler bulldozer was regarded as the research object in the paper.The dynamic characteristics matching of electric drive crawler bulldozer was conducted by theoretical analysis and dynamic simulation.Firstly,the mathematical models of crawler bulldozer kinematics,dynamics and track-ground contact mechanics were established by using theoretical knowledge,and the simulation model of the crawler bulldozer was established by multi-body dynamics software RecurDyn,and the kinematics and dynamics of electric drive crawler bulldozer on different road surfaces were simulated and analyzed.The variation law,such as the center of mass,the length between track-ground contact,specific pressure and slip rate of track-ground changing with the cutting depth of bulldozer under the dozing operation conditions on different road surfaces were analyzed,and the load characteristics of the bulldozer under the bulldozing conditions were obtained.The simulation results show that the working resistance on the dry sand pavement is large,and the driving torque of the motor is also large,so the simulation result obtained on the dry sand pavement was used as the load characteristic of the crawler bulldozer.Then according to the load characteristics and the working environment characteristics of the crawler bulldozer,the main components of the electric drive system were selected and analyzed.In order to make the whole power transmission system achieve the best power distribution as much as possible,and combined with the characteristics of the main components of the electric drive system,the matching principle between the main components of the electric drive system was proposed to meet the requirements of the dynamic characteristics of the electric drive bulldozer.According to the above analysis,the basic parameters of the main components of the electric drive system were obtained through calculation.Finally,the ADVISOR simulation software was used to simulate the original and improved electric drive crawler bulldozer to verify the dynamic performance of the improved electric drive system of the crawler bulldozer.The studying result shows that the improved drive motor can meet the load characteristics of the crawler bulldozer under the bulldozing conditions through theoretical analysis and simulation research,and the improved electric drive system can meet the dynamic characteristics of the D320 E electric drive crawler bulldozer under maximum load conditions.