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Open AccessArticle

Theoretical Investigations of the Headland Turning Agility of a Trailed Asymmetric Implement-and-Tractor Aggregate

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Department of Mechanics, Faculty of Construction and Design, National University of Life and Environmental Sciences of Ukraine, 03041 Kyiv, Ukraine
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Department of Agricultural and Environmental Science, University of Bari Aldo Moro, 70126 Bari, Italy
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Department of Agricultural Machinery, University of Ruse “Angel Kanchev”, Studentska 8, POB7017 Ruse, Bulgaria
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Faculty of Engineering, Latvia University of Life Sciences and Technologies, LV-2130 Jelgava, Latvia
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Author to whom correspondence should be addressed.
Agriculture 2019, 9(10), 224; https://doi.org/10.3390/agriculture9100224
Received: 27 August 2019 / Revised: 13 October 2019 / Accepted: 14 October 2019 / Published: 16 October 2019
Turning time occupies a significant part of the operations carried out by implement-and-tractor aggregates, especially in fields with short runs. Incorrectly executed turns increase the width of the turning strips, significantly increasing the idle path of the implement-and-tractor aggregate, with negative effect on its efficiency. The objective of this paper was to theoretically analyse the turning agility of an asymmetric implement-and-tractor aggregate, taking into account its forward speed and design parameters. Considering a trailed asymmetric swath reaper and tractor aggregate, the obtained equations allowed a numerical simulation in order to evaluate the headland turning agility of this implement-and-tractor aggregate. The minimal radii of the trailed asymmetric swath reaper and tractor aggregate are, respectively, 8.33 m for right-side turn and 4.90 m for left-side turn. Furthermore, the optimal angle between the longitudinal axis of the aggregating tractor and the hitch bar of the trailed asymmetric implement exists only in the case of left-side U-turns and its value is 1.12 rad (64°). It is not possible to cover right-side U-turns or both right- and left-side pear-shaped loop-turn in the optimal mode. View Full-Text
Keywords: asymmetric aggregate; turning radius; turning manoeuvre; headland width; turning agility asymmetric aggregate; turning radius; turning manoeuvre; headland width; turning agility
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Bulgakov, V.; Pascuzzi, S.; Beloev, H.; Ivanovs, S. Theoretical Investigations of the Headland Turning Agility of a Trailed Asymmetric Implement-and-Tractor Aggregate. Agriculture 2019, 9, 224.

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