Design of a universal mounting fixture (UMF) for ROPS using finite element method

Abstract

A finite element model of Universal Mounting Fixture (UMF) was developed in CATIA_V5. This model consisted of a number of beam elements and nodes connected to the tractor frame. For the simulation, fasteners between the ROPS and tractor axle housing were designed. The finite element model was developed parametrically to accommodate a range of tractors and ROPS sizes. The parametric design permits changes in the model dimensions without varying the number of nodes or elements. It was important to note that this research examined trends for various scenarios for one base-fixture finite element model. The final design of fixture was developed and tested in accordance with IS 11821 (Part 2): 1992 [1]. With due consideration of part geometry, OCTREE Tetrahedron mesh was selected and parabolic displacement interpolation was used between the nodes and elements. After getting the satisfactory result of UMF, the fixture was fabricated and validated through static testing of ROPS. The sequences for the loadings were as follows: rear longitudinal, vertical crush, transverse, and second longitudinal. Each testing except vertical loading, were carried out until the fulfillment of energy criterion. The vertical loading test required maintaining of the load for a specific period of time. The axle housing and mounting fixture combinations must pass the static testing criteria as per standard for acceptability. The fixture design has been patented and being used in testing different types of tractor ROPS.