Strength analysis of energy absorbing protective structure for excavator

초록

Roll-over protective structures (ROPS) are essential safety features for excavators, particularly when operating on slopes. The load testing of ROPS systems for certification is mandated by ISO 12117-2 requirements. However, hydraulic excavators' attachments affect the required performance capability of the ROPS, making the evaluation process complex. This study presents a methodology for evaluating the strength of hydraulic excavator ROPS using numerical analysis. Nonlinear finite element analysis using ABAQUS is performed to assess the safety of the ROPS according to ISO standards, reducing time and costs by minimising the number of physical tests required. The structural strength analysis of the ROPS involves nonlinear contact, buckling, and large deformation, solved through quasi-static analysis and penalty method. Lateral, longitudinal, and vertical loads are performed, and the results show a good correlation between finite element analysis and bench test results. The study validates the FEA methodology for hydraulic excavator ROPS and provides a framework for performing strength tests on protective structures using numerical analysis methods.

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