A theoretical and experimental study of the traction properties of agricultural gantry systems
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Kuupäev
2020
Kättesaadav alates
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Estonian Academic Agricultural Society
Abstrakt
The movement conditions experienced by an agricultural
gantry system along the solid and level ground surface of permanent
artificial tracks must make it possible to generate most of its maximum
tractive force. Concurrently, the adhesive ability of the agricultural gantry
system on the ground surface of such permanent artificial tracks must be
sufficient to generate nominal drawbar pull when working at a certain level
of slip. This means that there exists the need to seek out the following
compromise: the maximum slippage experienced by the wheeled chassis
of an agricultural gantry system must be such that, in a situation in which
the level of adhesion with the surface of permanent artificial tracks is
suitable, it will be able to generate the maximum possible tractive force.
The effect of the parameters that involve an agricultural gantry system's
wheels – and the physical and mechanical properties of the ground surface
along which they move – on potential slippage has not yet been sufficiently
studied. This effect cannot be taken into consideration without taking into
account the dynamics of any rolling resistance being offered by the
agricultural gantry system's chassis. The purpose of this particular study is
to research the traction properties of an agricultural gantry system's
wheeled chassis in terms of its movement along compacted and level
ground upon which have been mounted permanent artificial tracks. The
research determines that the wheels of such an agricultural gantry system
that are rolling along permanent artificial tracks suffer less slippage and
therefore generate a higher level of tractive force. As a result, the
agricultural gantry system loses less of its speed of movement and,
therefore, uses less energy in that movement. When an agricultural gantry
system moves across an agricultural field that has been prepared for
sowing, the research also determines the maximum tractive force that its
wheels can develop when the adhesion coefficient is set at a figure that is
between 0.22–0.24. Once such movement begins along permanent
artificial tracks, this coefficient decreases to between 0.15–0.17. An
agricultural gantry system's wheels are able to generate a higher level of
tractive force when moving along on permanent artificial tracks. This
figure is at least 30% higher when its movement has to be considered
across an agricultural field that has been prepared for sowing.
Kirjeldus
Saabunud / Received 12.04.2020 ; Aktsepteeritud / Accepted 18.05.2020 ; Avaldatud veebis / Published online 18.05.2020 ; Vastutav autor / Corresponding author: Jüri Olt e-mail: jyri.olti@emu.ee
Märksõnad
agricultural gantry system, drawbar pull, rolling resistance, tractive force, slip coefficient, articles