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Dynamic simulation modelling of agricultural tractors with automatic deployment of ROPS

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2016 ASABE Annual International Meeting  162380636.(doi:10.13031/aim.20162380636)
Authors:   Bernardo Martin-Gorriz, Dolores Ojados Gonzalez, Isidro Ibarra Berrocal, Beatriz Miguel Hernandez, Gustavo Adolfo Salcedo, Andres Guasp Alburquerque, Alvaro Macian Morales
Keywords:   tractors, ROPS, safety, passive safety, dynamic simulation.

Abstract. Tractor overturns are the leading cause of fatalities in the agricultural industry. An inadequate use of the deployable ROPS in agricultural tractors contributes to causing accidents. To help resolve this problem, an automatically deployable ROPS was designed, constructed and tested to be used for agricultural tractors with a front-mounted ROPS. Computer-based dynamic simulation modeling techniques, validated by practical rollover trials, were employed to investigate tractor lateral rollover behavior, with particular respect to the automatic deployment devices of protective structures for tractors with a front-mounted ROPS. The simulation model developed for this investigation was produced using SolidWorks 3D software in combination with SolidWorks Motion dynamic simulation software, and for motion analysis ADAMS has been used as the calculation engine. The virtual scenarios always comprised two elements: tractor and ramp. A 1:16 scale tractor (New Holland T6070) has been modelled as the vehicle that is moved along the ramp. The tractor was equipped with the safety device for the automatic deployment of a ROPS, developed by the research team of the project. A spiral ramp was selected as the most appropriate method to obtain the rollover of the tractor. For validation by real rollover trials with the scale tractor, a real scale ramp (1:16) was built in acrylonitrile butadiene styrene using a 3D printer, and the scale remote-control tractor was propelled along the ramp to the point of rollover. A high speed camera was used to determine the time and point of rollover. The results showed that the simulation scenarios of overturning have allowed us to obtain the values of the lateral slope angle of the tractor at each time, speed, and force by each of the wheels on the ramp and angular velocity of the tractor. Through real rollover trials with a scale tractor on a spiral ramp it has been possible to validate a simulated scenario. The simulation has shown good accuracy in the prediction of the roll angle; the maximum relative error between the simulated result and experimental data was -3.01%.

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