Development and validation of automatically deployable ROPS based on airbag inflator technology

Abstract

Narrow-track tractors are generally provided with foldable ROPS (roll-over protective structure). Most deaths on narrow tractor rollover occur because of inadequate use of foldable height ROPS. In this research, three automatically deployable ROPS (AD-ROPS) were designed, constructed, and tested to select the best option for installing airbag inflators and deploying time. The best and most reliable option has been found to be SHI2-30V612 inflators in each of the inclined beams of the AD-ROPS. They were tested according to OECD Code 6 Standard and the results obtained were used to assess the ability of the designed AD-ROPS to achieve a positive result in these tests. A 3D graphic computer program was used to predict the test results when mounting the AD-ROPS on a given tractor model and to change these results by varying one or more of the tractor parameters affecting them. For a given tractor model equipped with one of the tested AD-ROPS, it was possible to determine the locus of the AD-ROPS attachment points ensuring both a positive result in the tests and a match to the field of vision requirements. A laboratory-based rollover test of a quad-bike equipped with an AD-ROPS showed that it could effectively protect the driver in the event of a side overturn if the driver remains in his/her seat with the safety belt fastened and with his/her head in a tucked position.