Abstract
The article is devoted to modeling the process of electron beam welding in the manufacture of electric motors with a bimetallic ring used in biofuel preparation reactors. The main problem at ...the current stage of production is the choice of the technological mode of welding and the repeatability of the result. In this work, the authors simulate the welding of electric motors with a bimetallic ring under various technological modes in the ANSYS simulation environment in the process of electron beam welding. The result of the work will be a graphical representation of the temperature distribution on the surface of the product at various values of the technological parameters (electron beam current, welding speed and welding process time). Today, the choice of modes for a new technological process is carried out experimentally, which entails high material costs. The approach proposed by the authors allows, with minimal time and material costs, to select a technological mode for welding products from new alloys.
Abstract
The presented work is devoted to the study of the effect of various values of the electron beam current on the distribution of the energy cross section of the weld when conducting the ...technological process of electron-beam welding of thin-walled structures. The work is used by the simulation system of COMSOL Multiphysics, in which mathematical models of energy distribution proposed by the authors are implemented with electron beam welding. Imitation modelling was carried out for two materials widely used in the aerospace industry: titan alloy BT14 and AMG aluminum alloy. The values of the parameters for which the simulation was carried out were selected as a result of the predetermined process of optimizing the technological mode of electron beam welding for the construction under study. In the process of the research, a change in the value of the electron beam current is carried out both in less and to the large side. The article presents visualization for the three values of the parameter under study for each material, which makes it possible to judge the effectiveness of the previously formed set of optimal parameter values.
Abstract
The article is devoted to solving the problem of modelling the distribution of energy in the steady mode with electron beam welding with the means of ANSYS Academic Student. The authors ...propose the implementation of the simulation model to allow evaluating the density of the heat field in the assembly unit of the product when it is connected to its elements by means of electron beam welding. Two imitation models are implemented for one of the types of aerospace products, made of titanium alloy and aluminum alloy. Such models allow research to assess the effect of technological parameters of the process of electron beam welding on the heating intensity of the zone near the weld. A series of experiments with visualization of their results for various power values was carried out.
The article is devoted to a review of approaches used to simulate thermal processes occurring during electron beam welding of thin-walled products. The analysis of more than fifty sources is carried ...out on the basis of which ideas about the current state of the problem considered in the article are formed. To implement the simulation, it is possible to use modern software systems such as: ANSYS, Comsol Multiphysics, Abaqus and NX Nastran, each of which has its own set of advantages and disadvantages. By using the method of expert evaluation on the basis of the formulated criteria, the most effective software was selected. The results of the study of mathematical models implemented in the selected software system will allow not only to get an idea of the thermal process occurring during electron beam welding of thin-walled products, as such, but also to form a mathematical justification for making technological and control decisions.
The article presents a set of tools for improving the system of enterprise business processes using computer-modeling methods. The widespread functional approach to management, based on the old ...paradigm, in recent decades, has ceased to correspond to the new economic conditions. The rocket and space industry enterprises entered the world market for high-tech products, and therefore the importance of effective methods for modeling business processes in a market economy determines not only the competitiveness of the organization but also often solves the issue of the survival of domestic enterprises in the conditions of fierce global competition.
Abstract
The article deals with the problem of metrological support of innovative technologies, in particular, related to the production of promising renewable energy sources such as biofuels. In the ...process of biofuel separation, it is very important to monitor various technological parameters: pressure, flow, liquid level, temperature, etc. For this purpose, measuring devices are used as part of the automation of technological processes. At the same time, flow turbulence can have a significant impact on the accuracy of the readings of these devices. Often, the transition from laminar to turbulent flow is associated with the formation of a vortex when overcoming the flow of various constrictions at the outlet of the installations. The paper considers a method for preventing the formation of vortices through the use of a anti-vortex device (AVD). Computer modeling of the fluid flow in the SolidWorks software package was carried out in order to determine the optimal geometric characteristics of the AVD. In particular, the influence of the gap in the AVD and its plate diameter was studied.
Modeling is one of the most important parts of applied research, the processes for which carrying out full-scale experiments is either expensive or highly labor-intensive. The article deals with the ...problem of modeling the energy distribution at the stage of electron beam input during welding. The solution to this problem will allow not only to reduce the cost of testing the technological parameters of electron beam welding of products with new geometry or from new materials, but also to support the decision-making of the technologist when optimizing the manufacturing process of existing products. Based on the theory of thermal processes, mathematical models have been developed that consider the characteristics of the materials to be welded and the technological parameters of the electron-beam welding process. In the course of experimental studies, the energy distribution was simulated when the electron beam was introduced for structures made of two different materials with different geometries. The obtained models for calculating the temperature at the input section not only supplement the complex of existing mathematical models of the electron beam welding process, but also allow expanding their application for calculating and optimizing the welding process, taking into account the excess temperature at the electron beam input section. In the future, this will allow considering the temperature spread at the input stage and obtaining a more stable quality of the welded seam with fewer root defects.
The article presents the results of mathematical modeling of the thermal process when the AMG-6 alloy is heated to energy sources equivalent to an electron beam in electron beam welding. The analysis ...of the results was carried out using the functional proposed by the authors. We develop the algorithm for searching for the optimal technological regime of electron beam welding, which can be recommended for testing the EBW technology of new construction materials or improving the existing old technological processes and the results of calculations, is proposed. As an example, the results of modeling the parameters of the technological process for welding a plate with a thickness of 2.4 cm from the AMG-6 material are given, which were compared with experiments conducted in laboratory conditions.
The article describes the development of the software system for selecting the main modes of the diffusion welding technological process, with the implementation of the antifriction coatings based on ...fluoroplastics. The description of the algorithms for determining the main technological regimes from the entered necessary values of the tensile strength and wear rate, working conditions, operating temperature range, and the required composition of the material is given. The choice of the main parameters values of the technological process is made according to the maximum value of the tensile strength and the calculated value of the wear rate. According to the developed algorithm, the current values of the main parameters of the technological process are calculated. In case of insufficient strength of the joint or exceeding the value of the wear rate, the technological parameters are adjusted within the established limits or the coating material is replaced. For the decision support system in the design of technological processes, information bases were developed on the existing modes of polymeric materials diffusion welding to substrates of various types, and a database of tribotechnical information. The information database is implemented in a three-purpose software shell: 1) for entering and searching information in the database by fields, 2) for the work of an expert technologist, for linking information fields on topics, technologies, materials, 3) for work in the information mode, and in the mode of issuing an information array for process control. The constructed models and databases made it possible to create an algorithm for automating the diffusion welding process with the definition of the main modes. An algorithm for automating the selection of the diffusion welding main modes has also been developed. For the implementation of the "query generation" unit of the enlarged search algorithm, a production model of knowledge representation was used. As a result of the algorithm, an array of information is transmitted to the following modules of the algorithm. Databases were filled and logical connections of knowledge representation were established.
In this paper, we researched the influence of the electron beam defocus on the quality of the weld. The carried-out research was based on the theory of the thermal field using mathematical models ...developed by the authors. As a criterion of optimality, the previously developed thermal functional was used. We obtained criteria that can be used to simulate processes in electron beam welding, and to obtain more accurate modes, which is necessary to bind to power equipment. The obtained results of the criteria can be used for electron beam welding of various materials and different thicknesses.
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