Virtual Prototype Modeling And Finite Element Analysis Of Hydraulic Excavator

Hydraulic excavator as an important engineering machine, plays an important role in the construction of infrastructure. The main work device can finish all kinds of assignments driving by the three hydraulic cylinders. The structure and properties of main device directly decides machine flexibility, working safety, and it also impact on the working efficiency. Because of the bad working environment and the complex motion, the working parts often partial or overall damage, but at the beginning of the design, the strength of each component meets the requirement of work. For the damage in moving, the improvement and optimization of the structure has been a research problem. In this paper, we take a model of the hydraulic excavator as the research object, completed the following research:(1)Completed the model and theoretical analysis of kinematics and dynamics of the main working device of hydraulic excavator. We analyze and identify the method to calculate digging force, digging resistance and force of each hinge pin point under different mining methods which lay a theoretical basis for the dynamic simulation and finite element analysis of follow-up.(2)Using Solidworks and ADAMS software, build a virtual prototype model of hydraulic excavator, we get the entire operating range figure and the force curve of each hinge pin point in the whole work process which provide a basis for the analysis of the intensity for working part. Taking same key points on boom for parametric design and selecting the force at the hinge point of boom and body as the design variable optimization. Found the design variable which generated lager affect on result. To some extent improved the force of joint by optimizing and the reliability and safety of the working device.(3)Building the finite element model of excavator working device in the ANSYS Workbench environment and get the stress and strain chart of the boom and the bucket in three conditions after analysis and calculation. After analyzing the results, improved the stress concentration region on boom. After optimization the stress and strain distribution was more uniform than before and ensure the reliability of the excavator.