Multidisciplinary Co-simulation Study And Efficiency Analysis Of Hydraulic Excavators

In our country, the excavator technologies are short of innovations. And the core technologies of the driving and control systems are not mastered, especially the key components in the hydraulic transmission and control systems, such as the hydraulic pumps and the multi-way valves.The basic research of the excavator’s virtual prototype is developed based on the Yuchai YC60excavators’platform. The fine virtual prototype model of multidisciplinary system is built up with the professional software. And then the prototype model is analyzed through the co-simulation.Using the excavator virtual prototype based on the co-simulation of the multidisciplinary, the excavators are more easily to be evaluated and optimized,to be obtained the performance characteristic and states when the system is running,to be appraised the rationality of the design, to be shorten the design cycle and reduce the design blindness. Then the security and stability when testing the products can be ensured. The main contents of the thesis are presented as follows:Chapters1, the applications of LUDV system on mini excavator are introduced firstly based on the market demand, the performance requirements and characteristics of the excavators. The project source, research background and the research status at home and abroad are introduced. The necessity and possibility of the virtual prototype technology applied to design the hydraulic excavator are demonstrated. Then the implementation strategy is discussed. The main contents and the methods are presented.Chapter2, the structure and characteristics of the LUDV hydraulic system are described based on the analysis of the principle and mathematical model of the LUDV hydraulic system. The operation principle of the multi-way valve and the constant-power pump are mainly presented. Then the LUDV hydraulic system model is established using the dynamic simulation software-AMESim.Chapters3, the models of the main components of the excavator are established using the3D drawing software-Solidworks. The machine’s virtual assembly is completed in Solidworks. The3D model is completed the conversion and import from Solidworks to ADAMS in which the kinematics models are obtained. The restrictions and drives of the model are added reasonably and the excavator virtual prototype of main components is generated. The simulation and the results processing is executed in ADAMS. The operation range of the excavator is determined through the analysis of the simulation results. And some special operation sizes of the hydraulic excavator are obtained accordingly. Chapter4, the co-simulating mechanism of the virtual prototype is presented. The co-simulation virtual prototype model based on the AMESim and ADAMS is established. The required parameters used in simulation are tested. The virtual prototype model is validated and analyzed from simple to complex. The methods to improve the efficiency and save energy under several conditions are analyzed.Chapter5, the equipment sand apparatus, data acquisition and processingused in the platform based on Yuchai YC60excavator are introduced. The characteristic curves of the system under the typical conditions are obtained through experiment. The validity of the virtual prototype model is ensured through the comparison and analysis of the test results and the simulation results.Chapters6, conclusions in this thesis are summarized and future research proposals are suggested.