SIMULATION OF TRACTION WORK TO RATIONALISE THE WEIGHT DISTRIBUTION OF THE 4WD ELECTRIC TRACTOR A. Kozhushko, Viacheslav Tkachov, Oleksii Horbov, Daniela-Doina Cioboată International Journal of Mechatronics and Applied Mechanics, 2024 - Electric tractors, as the latest direction in agricultural machinery, have recently attracted considerable attention due to their environmental, economic and technological advantages. With the global transition to renewable energy sources and the tightening of requirements to reduce greenhouse gas emissions, electric tractors are a promising option for improving the agricultural sector. The aim of this type of material is to increase the overall efficiency of the four-wheel drive mini-electric tractor through the rational selection of the weight that falls on the tractor axle and the amount of internal pressure in agricultural tires. The objective was achieved by using a simulation model of the operation of a permanent magnet synchronous machine in Matlab and by incorporating the most loaded test cycles of DLG-PowerMix. The practical significance of the presented work consists in determining the change in the range of values of the weight distribution on the axle of the 4WD electric tractor and the pressure in the tires during aggregation on the most heavily loaded agricultural works, which will be useful when performing plowing and cultivation works on farmland. The scientific novelty of the work is the establishment of a relationship between the weight distribution on the axle of a 4WD electric tractor and the pressure in the front and rear tires of the driving wheels when simulating traction work according to the DLG PowerMix cycles of plowing and cultivation.
Mechanical and Surface Characteristics of Selective Laser Melting-Manufactured Dental Prostheses in Different Processing Stages Edgar Moraru, Alina-Maria Stoica, Octavian Donțu, Sorin Cănănău, Nicolae-Alexandru Stoica, et al. Materials, 2023 Due to the expansion of the use of powder bed fusion metal additive technologies in the medical field, especially for the realization of dental prostheses, in this paper, the authors propose a comparative experimental study of the mechanical characteristics and the state of their microscale surfaces. The comparison was made from material considerations starting from two dental alloys commonly used to realize dental prostheses: Ni-Cr and Co-Cr, but also technologies for obtaining selective laser melting (SLM) and conventional casting. In addition, to compare the performances with the classical casting technology, for the dental prostheses obtained through SLM, the post-processing stage in which they are in a preliminary finishing and polished state was considered. Therefore, for the determination of important mechanical characteristics and the comparative study of dental prostheses, the indentation test was used, after which the hardness, penetration depths (maximum, permanent, and contact depth), contact stiffness, and contact surface were established, and for the determination of the microtopography of the surfaces, atomic force microscopy (AFM) was used, obtaining the local areal roughness parameters at the miniaturized scale—surface average roughness, root-mean-square roughness (RMS), and peak-to-peak values. Following the research carried out, several interesting conclusions were drawn, and the superiority of the SLM technology over the classic casting method for the production of dental prostheses in terms of some mechanical properties was highlighted. At the same time, the degree of finishing of dental prostheses made by SLM has a significant impact on the mechanical characteristics and especially the local roughness parameters on a miniaturized scale, and if we consider the same degree of finishing, no major differences are observed in the roughness parameters of the surfaces of the prostheses produced by different technologies.
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