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Keywords = universal earthmoving machinery

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14 pages, 2594 KiB  
Article
Leveling and Minimizing the Load of the Universal Earthmoving Machinery Actuators by Improving the Kinematics of Their Movement When Digging the Soil
by Volodymyr Musiiko, Juraj Gerlici, Mykhailo Honchar, Andrii Koval, Anatolii Korpach, Lukáš Čajkovič, Vladimír Pavelčík and Kateryna Kravchenko
Appl. Sci. 2022, 12(15), 7462; https://doi.org/10.3390/app12157462 - 25 Jul 2022
Viewed by 1487
Abstract
This article considers external loads experienced on the rotor actuator of the universal continuous earthmoving machinery when digging wide excavations (ditches) in the soil and the ways to improve its productivity. Under the condition of translational and rotational supply of the soil-developing actuator [...] Read more.
This article considers external loads experienced on the rotor actuator of the universal continuous earthmoving machinery when digging wide excavations (ditches) in the soil and the ways to improve its productivity. Under the condition of translational and rotational supply of the soil-developing actuator to the face, the possibility of minimizing and leveling external loads on the actuator by improving the kinematics of its cyclic movement in the face has been experimentally proved. The actuator should move according to the required trajectory, which corresponds to the curve of the lemniscate of Bernoulli. The load of the UEM soil-developing actuator, operating in the mode of digging the soil, and the effectiveness of the suggested method for leveling the external loads have been experimentally assessed on the current physical model of the operating equipment. Leveling and reducing the absolute values of loads on the UEM operating equipment is achieved by improving the actuator trajectory optimization when digging the soil. It implies the additional rotation of the actuator intermediate frame at the end of each half cycle of the operating process. The required duration of the additional rotation of the intermediate frame is functionally dependent on the actual speed of machinery movement. The additional rotation of the intermediate frame, the duration of which is 1.1 s in the mode of maximum productivity, reduces the maximum load of the operating equipment, namely: torque on the rotor axis Mt-by 19% (up to 60 kN m), the components of the main force vector: vertical force-by 9% (up to 40 kN), and lateral force Pl.m-by 32% (up to 58 kN). The obtained results enable to comprehensively assess the maximum load of the UEM operating equipment under the conditions of changing values of the factors on which it depends and to objectively assess the directional stability of the machinery. Aligning the thickness of the shavings cut by the buckets of the rotor actuator in a half-cycle enables to improve the productivity of the universal earthmoving machinery almost twice. Full article
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17 pages, 6084 KiB  
Article
Determination of Continuous Earthmoving Machinery Course Stability under the Conditions of Cyclic Lateral Loading
by Miroslaw Smieszek, Volodymyr Musiiko, Vasyl Mateichyk, Mykola Tsiuman, Andrii Koval and Jakub Mościszewski
Appl. Sci. 2022, 12(14), 7029; https://doi.org/10.3390/app12147029 - 12 Jul 2022
Viewed by 1528
Abstract
This article presents the results of complex theoretical and experimental studies on creating universal continuous earthmoving machinery operating under non-standard loading conditions, namely, cyclic lateral loading on the actuator during digging. The lateral loading is due to the complex nature of the actuator [...] Read more.
This article presents the results of complex theoretical and experimental studies on creating universal continuous earthmoving machinery operating under non-standard loading conditions, namely, cyclic lateral loading on the actuator during digging. The lateral loading is due to the complex nature of the actuator motion when digging the soil, namely, the longitudinal motion of the machinery, the actuator digging the soil, and the lateral reciprocating motion of the actuator. This allows for variable width excavations in the soil, whose width exceeds the width of the actuator. The key issue of this machinery operation is to provide its course stability. The article considers the choice of soil-developing actuator and shows the developed calculation schemes of external loading on the operating equipment and a base tractor when digging long excavations in the soil. The dependencies to define external forces acting on the actuator when digging the soil and determining the machinery course stability, considering their spatial nature, have been developed and suggested for practical use. The conditions to ensure the stability of the course of universal earthmoving machinery have been formulated and substantiated. The developed method for determining course stability can be used when creating industrial samples of trenching earthmoving machinery. Full article
(This article belongs to the Collection Recent Advances in Mechanical Systems Dynamics)
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