Integrated Finite Element Analysis and Experimental Validation of an Excavator Working Equipment

For hydraulic excavators, functions and reliability are important technical indicators. Previous mechanism analyses using finite element (FE) method have produced some computational results with only modest accuracies. The present study investigates a working mechanism of an excavator in its entirety from a system-integration viewpoint. Based on comprehensive analysis of typical operating conditions of the hydraulic excavator, the study builds an integrated, refined 3D FE model of the mechanism, and examines stiffness, strength and deformation at five typical operating conditions. Results are verified by product tests with product specimens. The results show that, stress distribution of the working mechanism clearly explains failure; integrated FE analysis for a whole working mechanism can greatly reduce computational errors arising from simplification of components, among other sources. It improves design of the current product, and provides a new approach for design and analysis of similar products.