Факультет робототехніки та штучного інтелекту
Постійне посилання на фондhttps://repository.lntu.edu.ua/handle/123456789/3434
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Item type:Наукова стаття, Application of Carbide Cutting Inserts as Indenters for Surface Plastic Deformation(2023-03-15) Svirzhevskyi, Kostiantyn; Zabolotnyi, Oleg; Machado, José; Tkachuk, Anatolii; Boiarska, InnaSurface plastic deformation has a high productivity and allows for products with unique operational properties, namely: a high quality of the surface layer, increased support stability of the profile of the treated surface, a strengthened surface layer, and the formation of residual compressive stresses in the surface layer. The essence of smoothing is that a tool with regulated geometric characteristics of the deforming element (indenter) under specific technological processing modes penetrates the surface layer of the workpiece and slides, deforming the microgeometry formed as a result of previous technological operations. The article considers the option of using carbide-cutting plates as deforming elements. For this, a morphological table of methods of spatial orientation of the indenter-plate has been developed, which includes 27 possible options for its installation. The algorithm for calculating the geometry of the contact zone of the indenter and the workpiece is presented. The contact interaction of the indenter plate and the workpiece was studied. On the basis of morphological analysis and conducted applied studies, rational installation angles of the deforming element were determined. The interdependence of the properties of the surface layer on the technological modes of processing was defined.Item type:Наукова стаття, Dynamical modeling and state estimations of gasoline and ethanol impingement sprays in GDI systems using experimental and state space based approaches(Morocco, 2025) ; ; ; Sobchuk, Dmytro; Dobrovolska, Lyubov; Fedik, LesiaThis study presents a comparative experimental and modeling analysis of the impingement spray characteristics of gasoline and ethanol using a high-pressure gasoline direct injection (GDI) injector. We develop Lyapunov-based approach to estimate key spray characteristics including rebound height with aid of MATLAB-based experimental data processing algorithms, both qualitative and quantitative assessments are provided, as well as a forecast of the state of these characteristics in future time intervals. We present a combined experimental and modeling approach for analyze the impingement spray behavior of gasoline and ethanol using a GDI injector taking into account base experimental results obtained in [3] where macroscopic properties were investigated via high-speed Schlieren imaging and Phase Doppler Particle Analysis (PDPA) across injection pressures ranging from 10 to 50 MPa. Data-driven modeling was supported by MATLABbased polynomial curve fitting and system identification techniques. Key findings reveal that gasoline exhibits superior spray penetration and atomization compared to ethanol, particularly at ultra-high pressures. This suggests that gasoline atomization could significantly enhance combustion efficiency and emissions reduction in GDI engines.