A Mathematical Model of the Plane-Parallel Movement of an Asymmetric Machine-and-Tractor Aggregate

Bulgakov, Volodymyr; Pascuzzi, Simone; Nadykto, Volodymyr; Ivanovs, Semjons

doi:10.3390/agriculture8100151

Cited by 48 publications

(38 citation statements)

References 20 publications

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“…The movement of such an aggregate has a certain specificity connected with the asymmetry of loading [5,6]. As a result, the rectilinear movement of the aggregate requires constant correction of the guiding wheels of the aggregating tractor.…”

Section: Fig 1 Trailed Asymmetrical Harvesting Aggregate In Operationmentioning

confidence: 99%

“…The general theoretical foundations of the movement of asymmetric aggregates are reflected in the classic works by Gjacheva L., Vasilenko P., etc. [5][6][7]. The stability of the movement and improvement of the steerability of asymmetric aggregates are affected by their dynamic parameters, the presence of certain devices (for example, spring compensators, etc.…”

Section: Fig 1 Trailed Asymmetrical Harvesting Aggregate In Operationmentioning

confidence: 99%

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Research of variants to improve steerability of movement of trailed asymmetric harvesting aggregate

Bulgakov

Nadykto

Ivanovs

et al. 2019

Engineering for Rural Development

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Improvement of the stability and controllability of the movement of a trailed asymmetric harvesting machine-and-tractor aggregate is an important scientific and technical challenge. The issue how to determine the moment that stabilises the movement of this asymmetric harvesting machine-and-tractor aggregate in a horizontal plane has been theoretically investigated without increasing the overall dimensions of the trailed harvester. Analytical expressions have been compiled for the moment that unfolds the trailed harvester, and the stabilising moment that is able to return it to the state of rectilinear movement. To ensure stable movement in a horizontal plane, a series of design solutions have been proposed. Thus, the transfer of the left supporting wheel of the trailed swath reaper to the right side of the longitudinal axis of symmetry of the wheeled aggregating tractor creates conditions for increasing the stabilising moment. The use of spring compensators at the place of coupling of the swath reaper to the wheeled aggregating tractor also creates conditions for stable movement of the trailed swath reaper in a horizontal plane. The conducted experimental investigations witness about an increase in the operational indices of the experimental asymmetrical machine-and-tractor harvesting unit.

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Section: Fig 1 Trailed Asymmetrical Harvesting Aggregate In Operationmentioning

confidence: 99%

Section: Fig 1 Trailed Asymmetrical Harvesting Aggregate In Operationmentioning

confidence: 99%

Research of variants to improve steerability of movement of trailed asymmetric harvesting aggregate

Bulgakov

Nadykto

Ivanovs

et al. 2019

Engineering for Rural Development

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“…A roll-bar is designed to stay in the vertical upright position (protection) during all stages of tractor use, but must be lowered during passage under canopy between crop rows in order to avoid interfering with foliage and fruits [16][17][18][19]. In addition, many specialised tractors have a relatively high centre of gravity and a reduced ground clearance that often makes it impossible to perform normal cultivation tasks in particular specialised crops [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

The Concept of a Compact Profile Agricultural Tractor Suitable for Use on Specialised Tree Crops

2020

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This study firstly examined certain methods of vineyard management typically adopted in Apulia for both table grapes and wine grapes. In the later phenological stages, guyot or spurred cordon vineyards have extremely abundant vegetation, which drastically limits the space available between the rows for the passage of a tractor, even for a narrow-track vehicle. On the other hand, vegetation in tendone vineyards is situated at approximately 1.90 m above the soil surface, so that total tractor height must be compatible with this cultivation method. Foliage canopies in these types of vineyard cultivation system were evaluated at the times of their maximum growth in order to identify the maximum possible size of a prototype tractor that would be able to pass between vineyard rows without interfering in any way with the vegetation and fruits. Using the results of field measurements, it was established that the prototype tractor must have a maximum height of 1600 mm, with a minimum front axle track of less than 1100 mm and a back axle track of less than 1000 mm. A tractor built to these specifications is now being tested in order to compare its performance with that of other tractors commonly used in Apulia in various agricultural contexts.

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“…In this regard, a theoretical study of the oscillations of front-mounted beet topped machine was carried out using Lagrange II kind equations even if not all acting forces on the dynamic system were considered [14,15]. Conversely, a more accurate mathematical model should analyze also the effect of the design parameters of the above-mentioned machine, on the oscillatory movements along sugar beet roots rows due to soil roughness [16]. Taking in mind the aforesaid, the aim of this work is to assess the design and kinematic parameters of a front-mounted beet topper, corresponding to more stable and suitable movements in the longitudinal-vertical plane and reduction of the indicated oscillations.…”

Section: Introductionmentioning

confidence: 99%

Oscillations Analysis of Front-Mounted Beet Topper Machine for Biomass Harvesting

et al. 2019

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The beet leaves and tops, which currently are excluded from the production process of sugar, could be an interesting opportunity for the production of renewable energy. Usually, the defoliators are joined with root collar remover machines, which are installed in front of the tractor. In working conditions on soils having natural roughness these front-mounted beet topper machines carried by tractors are affected by angular oscillations in a longitudinal-vertical plane that strongly affect the cutting uniformity. A theoretical study of these oscillations was carried out in this paper using Lagrange II kind equations, with the aim to assess the design and kinematic parameters of a front-mounted beet topper, corresponding to more stable and suitable movements in the longitudinal-vertical plane. A numerical simulation was then performed adopting the developed mathematical model. In order to improve the efficiency of this harvesting machine, a significant role is assumed by the soil preparation. In this work the stiffness and damping parameters of the feeler wheels pneumatic tires have been considered constant but further studies are in progress to assess their effective importance and influence for reducing the vibration of the front-mounted beet topper machine with the final aim to achieve a better machine design.

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A Mathematical Model of the Plane-Parallel Movement of an Asymmetric Machine-and-Tractor Aggregate

Cited by 48 publications

References 20 publications

Research of variants to improve steerability of movement of trailed asymmetric harvesting aggregate

Research of variants to improve steerability of movement of trailed asymmetric harvesting aggregate

The Concept of a Compact Profile Agricultural Tractor Suitable for Use on Specialised Tree Crops

Oscillations Analysis of Front-Mounted Beet Topper Machine for Biomass Harvesting

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