Computation of run-off-road vehicle speed from terrain tracks in forensic investigations

Máthé, L.; Kiss, Péter; Laib, Lajos; Pillinger, György

doi:10.1016/j.jterra.2012.08.002

Cited by 9 publications

(3 citation statements)

References 9 publications

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“…Most such MFWD tractors are manufactured in such a way that in static conditions rear wheels would be loaded by 55 to 65% of the total weight of the tractor. Tractor researchers recommend maintaining this proportion of vertical wheel loads in working conditions as well (Bris et al 2011;Stoilov, Kostadinov 2009;Máthé et al 2013;Żebrowski 2010). If it fails, it is recommended to aim that proportion between vertical loads of front and rear wheels would not deviate more than 10% (Pranav, Pandey 2008;Wong 2009).…”

Section: Introductionmentioning

confidence: 99%

Dependencies of the Lead of Front Driving Wheels on Different Tire Deformations for a MFWD Tractor

et al. 2015

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Tractors are the main machines in agricultural production processes. Agricultural tractors commonly employ a four-wheel drive transmission. To reach maximum efficiency in production works, tractors are loaded by as high thrust as possible. The consequence of it, quite often, is that the slippage of driving wheels grows to the limit that is not allowed. To reduce the slippage, various ways are pointed out in terramechanics. One way is to increase the tractor's weight by adding ballast. The other way is to increase the contact area between tires and the supporting surface. The slippage can be also reduced with traction control and other relevant systems. These methods, which help to reduce slippage, also affect tire deformation. When proportion of tires deformation is not the same as proportion of their sizes, the consequence is change of the lead of front wheels. In this paper analysis is presented, how the lead of front wheels affects the work of MFWD tractor in different conditions. Test results are presented for a MFWD tractor, how the lead of front wheels varies depending on deformation ratios between front and rear tires. For a MFWD tractor, values of deformation ratio between front and rear tires were determined, which ensured effective and which produced unreasonable values of lead of front wheels.

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Section: Introductionmentioning

confidence: 99%

Dependencies of the Lead of Front Driving Wheels on Different Tire Deformations for a MFWD Tractor

et al. 2015

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“…In-situ tests for the measurement of penetration resistance were performed at the experimental farm of Szent István University of Gödöllő (Máthé et al, 2013, Máthé, 2014, using a standard Eijkelkamp penetrologger (Eijkelkamp, Netherland) in the track of the GAZ-69 (69A) type of vehicle.…”

Section: In-situ Testsmentioning

confidence: 99%

“…Table 1. The measured soil properties at the time of penetration resistance measurement (Máthé et al, 2013, Máthé, 2014.…”

Section: In-situ Testsmentioning

confidence: 99%

Numerical simulation of soil–cone penetrometer interaction using discrete element method

Kotrocz

Mouazen

Kerényi

2016

Computers and Electronics in Agriculture

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One of the most common methods to measure soil strength in-situ is cone penetrometers. In this paper the development of a three dimensional (3D) discrete element model (DEM) for the simulation of the soil-cone penetrometer interaction in a slightly cohesive loamy sand soil is presented. The aim was to investigate the effects of the soil model's geometrical (e.g., soil model cross section shape and size and model's height) changes on variations in the soil penetration resistance. The model area ratio and height ratio values were adopted to analyse the effects of the cross section size and the model's height, respectively. The results of penetration resistance of the DEM simulations were compared with the in-situ measurement with a cone penetrometer of the same geometry. This comparison allowed the derivation of the contact properties between the elements. To simulate the soil material the so-called Parallel Bond and Linear Models were used in the 3D version of the Particle Flow Code (PFC) software. Finally the mechanical properties of the soil, namely the cohesion and internal friction angle were estimated by DEM simulation of direct shear box. Results showed that the penetration process can be simulated very well using the DEM. The model's calculated penetration resistance and the corresponding in-situ measurement were in good agreement, with mean error of 14.74 %. The best performing models were a rectangular model with an area ratio of 72 and a height ratio of 1.33 and a circular model with an area ratio of 32 and a height ratio of 2. The simulation output of soil material properties with direct shear box resulted in representative values of real loamy sand soils, with cohesion values range of 6.61-8.66 kPa and internal friction angle values range of 41.34-41.60°. It can be concluded that the DEM can

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Influence of Particle Gradation and Penetration Velocity on Deformation Behavior of Sandy Soil Based on CPT

et al. 2023

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Computation of run-off-road vehicle speed from terrain tracks in forensic investigations

Cited by 9 publications

References 9 publications

Dependencies of the Lead of Front Driving Wheels on Different Tire Deformations for a MFWD Tractor

Dependencies of the Lead of Front Driving Wheels on Different Tire Deformations for a MFWD Tractor

Numerical simulation of soil–cone penetrometer interaction using discrete element method

Influence of Particle Gradation and Penetration Velocity on Deformation Behavior of Sandy Soil Based on CPT

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