The Research On Simulation Method For The Power And Economics Of Bulldozer

Power performance and fuel economy of construction machineries is very important for the cycle-operational machines such as Bulldozer. Through researching Power performance and fuel economy of Bulldozer has significant meaning in improving productivity and decreasing fuel consumption, and meeting the current energy saving and low-carbon society's development trends.Based on synthesizing research status at home and abroad kinematics and dynamic have been analyzed in assembly and working state of bulldozer. Then, mathematical model of assembly of bulldozer and whole machine have been analyzed or modeled. In conclusion, the conversion equations of the bulldozers from the bulldozing resistance to the engine torque have been obtained which provides the basis for the momentum and economical simulation methods of bulldozers.The sharp fluctuations in horizontal bulldozing resistance of bulldozers have important effects on power performance and fuel economy. Based on the soil failure theory the resistance of bulldozer has been analyzed, and the expression of static traction has been obtained. Based on the research of the work-site experimental data from horizontal bulldozing resistance of T180 bulldozers in the reference the power spectral density function of continuous stationary random signal in dynamic resistance of the level of earth-moving bulldozer has been transformed into the discrete-periodic signals. By Simulated dynamic level of bulldozing resistance digitally under environment of simulate-software Advanced Modeling Environment for Simulations of engineering systems (AMESim), it can be seen that the results agree well with the original test signal.Based on theoretical model of bulldozers analyzed and dynamic level resistance simulated the engine simulation model has been established under AMESim, and the transform model has been established from the dynamic level resistance of bulldozing to the driving wheel torque by without considering the inertial force of the premise. Then the static converting-simulation model has been obtained in resistance torque of engine. At last, output power, mean effective pressure, output speed and fuel consumption in dynamic drag torque of engine have been obtained, as driving force and economy of the bulldozer have been simulated in dynamic level of bulldozing resistance condition by AMESim. Through searching engine start speed in regulation of bulldozers by AMESim, optimum value of the engine start speed has been obtained in particular initial condition which means at that time the engine output power is larger but fuel consumption is less.The simulation methods and ideas which have been proposed in this paper will provide references for researching in driving force and economics of construction machineries.