simulation

Mathematical Modeling of the P-I-N Diode Plasma Dynamics Under Harmonic Excitation Using Perturbation Theory Methods

The processes of electron–hole plasma formation in the active (i) region of semiconductor p-i-n diodes (plasma diodes) and the formation of space charge in the near-contact regions (p-i and n-i contact zones) under the influence of a periodic control signal are considered.  A methodology for studying the corresponding processes is proposed, and a mathematical model of the dynamics of the charge-carrier concentration distribution in the system under study is constructed based on the boundary-function method of perturbation theory and the Fourier separation-of-variables m

FEM ANALYSIS OF THERMAL SOFTENING – INVESTIGATION OF THE INFLUENCE OF WORKPIECE TEMPERATURE ON CUTTING FORCE IN THE DEFORM ENVIRONMENT [FEM-АНАЛІЗ ТЕРМІЧНОГО РОЗМ'ЯКШЕННЯ – ДОСЛІДЖЕННЯ ВПЛИВУ ТЕМПЕРАТУРИ ЗАГОТОВКИ НА СИЛУ РІЗАННЯ В СЕРЕДОВИЩІ DEFORM]

This paper presents the findings from numerical modeling of the turning process of titanium alloys with preheating of the workpiece. This modelling was conducted using the DEFORM-2D software environment, which is based on the finite element method (FEM). The objective of this study is to investigate the influence of workpiece temperature on cutting force and to determine the optimal heating parameters for machining materials that are challenging to process.

Application of Pseudorandom Number Generators in Machine Learning

This paper presents a comprehensive study of methods for detecting and localizing electronic warfare (EW) sources under complex conditions, which include the influence of intensive intentional jamming, multipath signal propagation, time-varying emission parameters, and dynamic movement of the sources. The relevance of the research is driven by the growing role of EW means in modern armed conflicts and the need to ensure timely detection and neutralization of such threats.

NEURAL NETWORK BASED CONTROL MODEL FOR WALKING PLATFORMS

This article presents a comprehensive study of a control model for legged robotic platforms, particularly hexapods, based on the application of deep reinforcement learning techniques. The relevance of employing artificial neural networks to form adaptive robot behavior in undefined conditions is substantiated, enabling greater flexibility and robustness in dynamic environments.

Computer simulation of dynamic processes in power skiving gear cutting

The paper presents the results of simulation of the dynamic processes during gear cutting using the power skiving method.  Oscillations in the elastic system of the machine tool have been studied using the Simulink Matlab system.  The closed dynamic system is represented as a series-coupled connection of the elastic system of the cutting process and the elastic system of the machine tool, which is assumed to be two-mass, with masses applied to the table assembly with the workpiece and to the tool spindle.  The input signals of the cutting process system – the thickness

DYNAMIC BEHAVIOR AND ENERGY DISTRIBUTION IN A CRANK-EXCITED THREE-MASS VIBRATORY SEPARATOR

This study presents the development and dynamic analysis of a mechanical model representing a multi-component vibratory system consisting of a feeder, a vibratory transporter, and a conveyor-separator. The main goal is to simulate the oscillatory response of a three-mass separator excited by a crank-slider mechanism and analyse its efficiency, focusing on the working body responsible for material separation. The vibratory system is modeled using a set of second-order linear differential equations derived via Lagrange’s second kind formulation.

INFLUENCE OF AXIAL TOOL FEED ON UNDEFORMED CHIP GEOMETRIES IN POWER SKIVING GEAR CUTTING

The purpose of this article was to formulate recommendations for developing strategies for multi-tool cutting of gear wheels that ensure a productive and reliable process for ensuring the accuracy and quality of machined surfaces.  The determination of the effective axial feed rate to achieve maximum productivity has not yet been fully explored. The objective of this article is to ascertain and examine the impact of axial feed on the chip formation process during the cutting of the gear rim.

MODELING AND PROTOTYPING OF AN ACOUSTOFLUIDIC SYSTEM FOR MICROPARTICLE SEPARATION

This article presents the results of numerical modeling and experimental prototyping of an acoustofluidic microchannel structure for the separation of microparticles suspended in a liquid medium. A two-dimensional model was developed to analyze the influence of geometric and physical parameters on the formation of the acoustic field within the microchannel and the efficiency of particle separation.

METHOD FOR RECONSTRUCTING 3D MODELS FROM IMAGES: A CASE STUDY USING THE SHAHED 136 DRONE

Method for reconstructing 3D models from images: a case study using the Shahed 136 drone. A study of the dimensional and proportional characteristics of the model is carried out. The main stages of model construction are considered. A block diagram of the image perspective transformation program is presented. The activity diagram given in the paper visualizes the steps required to perform an image transformation, including point selection, calculation, and generation of the final image.

DEVELOPMENT OF A PROGRAM FOR MODELING AND SIMULATING A COLLABORATIVE ROBOT WORKSPACE

The article presents the software development for modeling and simulating the workspace of a collaborative robot taking into account the presence of people. This is an important step in creating safe and efficient robotic systems within Industry 5.0 concept. The problem is posed by the need to ensure safety during the interaction of the robot with the operator, which is relevant for modern production processes with high human participation.