Modern technological machines, especially CNC machine tools, are designed to enable increased technological parameters, including spindle speed. In the case of lathes, increasing rotational speed also increases the centrifugal force acting on the jaws of the lathe chucks, reducing the clamping force on the workpiece being held. This means that the actual clamping force of the jaws is lower than original (…)
This paper examines an unusual annular erosion footprint observed during static exposure of metallic surfaces to an ultrasonically excited pulsating water jet (PWJ). The morphology is characterized by a comparatively preserved central region surrounded by a ring-shaped erosion zone, indicating that cumulative erosive loading is preferentially distributed away from the jet centerline. Circular and cresce (…)
This study investigates the effect of traverse speed on the surface characteristics of Ti6Al4V and Ti6Al7Nb alloys treated by ultrasonic pulsating water jet (PWJ). Surface topography, morphology, wettability, and surface free energy (SFE) were evaluated and compared with a commercial sandblasted Ti6Al7Nb femoral stem. The results showed that increasing traverse speed significantly reduced Sa and Sz for (…)
The aim of this paper is to investigate the friction behaviour of modern automotive engine oils using a prototype block-on-ring tribometer under controlled laboratory conditions. The study focuses on measurements performed at constant normal load with gradually increasing oil temperature, representing the transition from mixed to boundary lubrication regimes, and on measurements performed at constant lu (…)
The paper focuses on analysing the effect of cooling immediately after the hot-dip galvanizing process on the cohesion of the zinc coating after subsequent sweeping. Various cooling methods were experimentally evaluated in terms of their impact on internal stress and coating adhesion. Particular attention was paid to the formation of defects such as delamination or cracks, which negatively affect the qu (…)
Five-axis CNC machine tools are indispensable for manufacturing parts with complex geometry, yet the conversion of raw kinematic measurements into reliable maintenance knowledge is still often fragmented and manual. This article presents a Python-based monitoring environment that reads R-Test export files, invokes one of three selectable machine-learning models – Multilayer Perceptron (MLP), Kolmogorov- (…)
Stainless-steel gastronorm (GN) containers, commonly used in food-service operations, are widely employed for food storage, handling, and transportation. However, despite their extensive industrial utilization, scientific studies addressing their structural dynamics and modal behavior remain very limited. The aim of this study is to identify the modal parameters of the GN container in two distinct state (…)
Multi-material additive manufacturing is gaining attention for its ability to combine the strengths of different materials into a single part. In this study, a sandwich structure made of 316L stainless steel and ER70-S mild steel was created using a Meltio M600 laser-based wire Directed Energy Deposition (W-DED) system. Both single-material samples and the multi-layer sandwich structure were produced us (…)
Accurate representation of breast geometry is essential for the development of well-fitting bras. Conventional bra sizing systems are typically based on bust and underbust circumference measurements, which are often insufficient to capture breast shape variability and asymmetry. Therefore, 3D body scanning represents an effective alternative method for acquiring detailed geometric data of the female tor (…)
Powder recycling is widely applied in Selective Laser Melting (SLM) to reduce material costs and waste; however, repeated reuse may influence the characteristics of additively manufactured components. This study investigates the effect of powder recycling on the chemical composition, micropurity, and porosity of M300 maraging steel produced by SLM. Virgin and recycled powders were processed under identi (…)
Polycarbonate/acrylonitrile-butadiene-styrene (PC/ABS) blends are well-known for balancing the thermal, mechanical performance and processability of both the neat polymers. Therefore, it has been widely used for Material Extrusion (MEX) method. To further improve the properties of the blend, styrene-maleic anhydride (SMA) is employed as a compatibilizing agent, aiming at establishing better interfacial (…)
Cold Spray Additive Manufacturing (CSAM) is a solid-state process that enables high-rate fabrication and repair of metallic components with low thermal input, making it suitable for heat-sensitive materials. Its wider industrial adoption, however, is constrained by challenges in porosity control, geometric accuracy near edges and concavities, anisotropy, and costs linked to gas use and nozzle wear. Rece (…)
Explainable Artificial Intelligence (XAI) has emerged as a critical enabler for trustworthy machine learning (ML) deployment in industrial settings. In Additive Manufacturing (AM), while predictive models achieve high accuracy for defect detection, their "black-box" nature impedes engineering adoption, as operators cannot translate opaque predictions into corrective process adjustments. This study propo (…)
Hydrodynamic fluid bearings have become increasingly sophisticated, and the resulting design requirements have gradually exceeded the capabilities of conventional exhaustive analytical approaches. This development has increased interest in alternative methods, including data-driven modeling. Although black-box surrogate modeling requires evaluation of the physical validity of its predicted solutions, as (…)
The increasing complexity of transport technologies, maintenance operations, and spare-parts logistics requires decision-support approaches that integrate monitoring, information quality assessment, and operational risk evaluation under capacity-constrained conditions. Although existing research has extensively addressed inventory optimization and maintenance scheduling, considerably less attention has (…)
This paper considers the principles of equipping high-priority facilities, including healthcare institutions and other medical complexes, with uninterruptible power supply systems. A comprehensive approach to the energy supply of the facilities under consideration is proposed, which includes both autonomous power generation units for buildings and structures and additional backup power supply systems in (…)
This study investigates the phenomenon of nonlinear fluid inflow in stress-sensitive fractured-porous reservoirs of the East-European Shelf. It is established that the deformation of the void structure under declining reservoir pressure leads to a significant loss of conductivity in the filtration channels of the Lower Carboniferous sequence. Based on the integrated application of the power-law filtrati (…)
Hydrogen-assisted lean combustion represents a promising approach for improving the environmental performance of spark-ignition engines while maintaining high energy efficiency. This study presents an environmental assessment and operating window identification of a gasoline direct injection engine equipped with hydrogen port fuel injection under lean and ultra-lean operating conditions. Hydrogen energy (…)
This paper presents a simulation framework for modeling and analysis of small hydropower plants (SHPPs), focusing on the interaction between hydraulic, mechanical, and electrical subsystems. The proposed model integrates a hydraulic turbine, servo-drive actuator, governor control system, and an induction generator described by both simplified and complete dynamic models. Special attention is given to tr (…)
The article focuses on the issue of risk assessment at the design stage of machinery. Risk assessment includes risk estimation and risk evaluation, based on which appropriate measures are taken. If risk estimation is performed incorrectly, this may result in the design of inadequate measures to eliminate or reduce it. There are many different risk estimation methods, but the number of studies or article (…)
This paper presents an experimental and numerical evaluation of the blanking process of non-oriented electrical steel designated as material G. The experimental study evaluated the effect of FeinAl, Movic, and FeinAl + Movic coatings on blanking force at 1 % and 7 % punch-die clearances. In addition, the fracture angle of the blank was determined at punch-die clearances of 1 %, 3 %, 5 %, 7 %, and 10 % o (…)
This work establishes a novel, systematic methodological framework that bridges processing parameter quality (filament purity and infill density) with nondestructive macroscopic defect prescreening. By differentiating structural manufacturing artifacts from true material behavior prior to mechanical testing, this approach ensures reliable quality assurance for functional, biobased medical parts. The mat (…)
This paper presents the use of a learning curve for designing manual and motor skills tests intended for employee selection for an assembly line. The proposed approach addresses the need to assess candidates’ manual dexterity, motor coordination and tool handling before they enter training or production. A testing kit consisting of an assembly box, hand tools and an MS Excel-based evaluation sheet was d (…)
The integration of heterogeneous industrial robots and peripheral devices in modern production systems introduces challenges related to interoperability, synchronization of operations and unified process control. This paper presents a methodology for coordinating industrial robots from different manufacturers together with additional technological devices within a single robotic workstation. The propose (…)
The relevance of the article is due to the rapid development of global information systems and digital technologies, which affect the competitiveness of universities. In the context of the imbalance between rapid technological progress and changing university funding rules, there is a need for new methods of measuring and evaluating the educational and scientific productivity of universities. Such measu (…)
This paper argues that Aristotle’s ontology and logic can provide a systematic foundation for defining technical products, including software, in a clearer and more legally reliable way. The authors connect Aristotelian concepts such as substance, synonymy, and meaningful speech with Engineering Design Science and Methodology (EDSM), which they present as a uniquely suitable framework for identifying te (…)
A mathematical model and computational implementation of a digital twin for a bioresorbable polylactide (PLA) bone scaffold with a functionally graded triply periodic minimal surface (TPMS) architecture are developed. The model comprises four state variables (polymer mass, osteoblast population, growth factor concentration, and newly formed bone mass) and a system of reaction–diffusion equations adapted (…)
This study presents the design, structural analysis, and validation of a large-diameter butterfly valve in accordance with ASME and MSS standards. The valve body wall thickness was determined using ASME B16.34 Mandatory Appendix VI and MSS SP-67, with corrosion allowances included, resulting in an effective thickness of 21.58 mm. The flange body was designed following ASME B16.47 requirements, while emp (…)
Science Journal