CAE System Research Articles

К ВОПРОСУ О ТЕХНОЛОГИИ ПРОИЗВОДСТВА ПАНЕЛЕЙ ИЗ КОМПОЗИЦИОННЫХ МАТЕРИАЛОВ С ИСПОЛЬЗОВАНИЕМ СИАЛ

The article analyzes the most successful results of the use of metal-polymer composite materials (MPCM), reflects the advantages at the current stage of development. The analysis of the use of composite materials in the design of helicopter gliders is carried out. The use of microtubules in the manufacture of double curvature panels using MPCM is considered. Improvement of technologies in the production of structures made of MPCM. The search for optimal parameters of the technological process in the production of panels of double curvature of components based on SIAL used in the aircraft design is carried out. The optimal technological process in terms of time resources, material costs, and design weight at different levels of serial production were considered as optimization criteria in this study. Numerical modeling and optimization of workflow parameters were performed in the NASTRAN CAE system (NX). Each of the combinations of optimized process variables was determined based on numerical modeling. Analysis of the optimization results showed that the growth of parameters of the working process leads to an expansion of the area of locally optimal parameters. With optimal parameters of the working process, it is assumed that the cost of work will be reduced.

ОБОСНОВАНИЕ ПОСЛЕДОВАТЕЛЬНОСТИ ПРОЕКТИРОВАНИЯ КОМБИНИРОВАННЫХ ОПОР С ИЗМЕНЯЕМЫМИ ХАРАКТЕРИСТИКАМИ

The article presents the sequence of calculating a combined support with variable parameters in the form of an algorithm. The application of the graphical editor of the CAE–system APM Win Shaft for modeling a rotor rotating in combined supports with variable characteristics is described. The results of the calculation module are presented. The obtained Kembel diagrams are considered. An analysis is given to the switching diagrams of a combined support with variable characteristics during operation in transient processes according to a certain algorithm. The presented algorithm eliminates the possibility of increasing the amplitude of oscillations when passing through critical frequencies. Conclusions are drawn about the effectiveness of using the specified sequence of calculations Recommendations are given on the use of the proposed calculation sequence for the design of similar combined supports with variable characteristics.

Digital design of a cable-driven parallel robot

The paper analyzes various computer-aided design systems. It is shown that the use of CAD / CAM / CAE-system NX allows to reduce the cost of the final product, increase the level of quality, and reduce the time to market. The article discusses the digital design of a cable-driven parallel robot (CDPR) for various applications using the NX CAD / CAM / CAE system. The mechanism is a rigidly fixed frame connected through tensioned cables to a platform. CDPRs have such advantages as a large working area, ease of assembly and disassembly, high mobility, large lifting capacity, and reconfiguration. The kinematic diagram of the device is presented. Based on the terms of reference and sketch documentation, a preliminary composition of the CDPR has been developed. During the design, the Top-Down method was used. The characteristics are analyzed, and the workspace of the mechanism is formed, taking into account the factors of limitation. Shown is a detailed design of the basic structure of a CDPR with an indication of the main operations. An electronic-digital model of the basic structure of a CDPR, which will later be used for kinematic and static calculations, as well as for making an experimental sample, is presented.

EVALUATION OF STRESSED-DEFORMED CONDITIONS OF ELEMENTS TRAVERSE WITH LOAD CAPACITY OF 160 TONS

The article calculates the analysis of the stress-strain state of the traverse, taking into account additional loads acting in full-scale operating conditions. The presented calculation methodology is based on determining the permissible stresses and modeling the structure using the finite element method. A design scheme, a solid-deformed model have been developed, and a finite element method has been calculated in the CAD / CAE system. To determine the operating values ​​in the steel structure of the lower service, we will construct a model in natural values ​​with observance of the given characteristics and geometrical dimensions. The stress-strain state of the traverse elements is quite complex, since both compressive stresses and tensile stresses arise in one element in different planes, which are interchanged during the operation of the lifting structure. The above calculation and analysis of the strength of the metal structure of the lifting structure showed that this approach is suitable for the development on its basis of expert systems for assessing the lifespan of lifting structures, both at the stage of design and at the stage of operation

Cable robot design method using the NX CAD / CAM / CAE system

The article describes a method for designing a cable robot used for moving goods under special conditions. It is a parallel structure mechanism using the NX CAD / CAM / CAE system controlled by the Teamcenter PLM system. The mechanism is a rigidly fixed frame connected by tensioned ropes to a platform containing an axial displacement device. The diagram of the device is presented. To develop an electronic-digital model of the robot, the control structure that allowed for designing using the “Top-Down” method was built. The control structure reduces time required to develop a model. The spatial parameters of the device were determined. The product concept was developed.

Determination of the rational number of blades of the centrifugal wheel of a submersible pump

The CAD/CAE/CAM method of end-to-end design of the impeller of a seven-stage submersible pump ODDESSEzentralasien –UPP 13-7/6 used for pumping sulfuric acid in hydrometallurgy is presented.The studies are conducted in order to increase the efficiency of the pump manufactured at the KARLSKRONA LC AB LLP plant (Kazakhstan). Computer calculations of the centrifugal wheel with 8 and 9 blades for strength were carried out in the NASTRAN top-level CAE system. The influence of the number of centrifugal wheel blades on the level of stresses arising in the sections of the blades of the cover and main centrifugal wheel discs is determined. The maximum stress in the sections of the wheel with 8 blades reached 319 MPa and the wheel with 9 blades 199 MPa. The influence of the number of blades on the dynamic characteristics of the rotor shaft is examined. To do this, design mechanical and computer schemes of dynamic calculation are simulated to determine the amplitude-frequency characteristics of the rotor shaft. The harmonics amplitudes at frequencies caused by liquid pulsation at the blade frequency of 400 Hz and 450 Hz reached 110-4 m and 810-4 m, respectively. Based on the results of computer modeling of static and dynamic problems, a model of the impeller of a centrifugal multistage pump with a rational number of 8 double curvature blades is developed. The choice of the number of blades meets the criterion of wheel strength and the dynamic criterion of the shaft-wheel system.For the production of the prototype wheel, an analysis of the process parameters of 3D printing in terms of surface roughness of finished products is carried out. Based on the analysis, stereolithography the technology is chosen and centrifugal wheels are printed for further bench hydrodynamic tests in a plant. The studies based on CAD/CAE/CAM computer modeling allow reducing the time and costs of developing a rational wheel geometry that meets the criterion of both the strength of the wheel itself and the criterion of vibration activity of the rotor shaft

Валидация решений динамического анализа трубопроводных систем сравнением результатов вычислений, полученных в отечественном комплексе APM StructFEM и в системе ANSYS, применительно к задачам сейсмостойкости

Modeling pipelines using special tubular finite elements is a convenient tool for the analysis of pipeline systems. Such a formulation significantly reduces the dimension of the problem being solved and significantly accelerates the time required to perform calculation procedures. These advantages can be explained by a modeling feature that involves the use of a pipe model in the form of a rod having an annular cross section. This paper presents solutions to the problem of dynamic analysis of pipeline systems, including analysis of the pipeline response to seismic effects. The work was performed to assess the reliability of the dynamic solutions obtained using the Russian CAE system APM StructFEM.

CAE analysis and simulations of technological processes of selected high strength steels

The article of authors deals with the design of the structural part of the bodywork in the CAE system CATIA using the CAE software solutions of the Autoform system, which are based on the finite element method. This design was subsequently implemented into the design of dies in order to achieve the most efficient and high-quality dies, which are increasingly required in industrial practice for lifetime and functionality. Three types of high-strength steels TRIP HCT780T, DP-HCT780X and CP-HCT780C with approximately the same tensile strength were selected for the experiments. Based on the input parameters, simulations were implemented and the results obtained from the simulations will be the basis for selecting the most optimal variant. The main measurable and evaluative factor was the outputs obtained from the FLD diagrams.

АНАЛИЗ МЕТОДОВ ПРОЕКТИРОВАНИЯ ОХЛАДИТЕЛЕЙ СИСТЕМ ОБЕСПЕЧЕНИЯ ТЕПЛОВОГО РЕЖИМА СУДОВЫХ ЭНЕРГОУСТАНОВОК

The design methods for shipboard shell-and-tube oil and water coolers are presented. As a result of the review, it was revealed that currently there is no systematic and complete methodological support for the integrated computer-aided design of ship heat exchangers (CAD SHE), which in turn would be integrated into the CAD / CAM / CAE system and later on into the production preparation. From the analysis it follows that not all operating conditions of ship power plants are provided with an oil cooler. This is due to the fact that the surface of the cooler and its flow characteristics were calculated only on the nominal mode, and other operating characteristics were not evaluated. The complexity of the work of ship oil and water coolers lies in the fact that the parameters of the heat load on these devices change, the temperature and salinity of the outboard water change depending on the navigation area. Determining the effect of the oil cooler on changing the power of the power plant when the characteristics of the cooling coolant (seawater) change, such as initial temperature, flow rate, salinity, without additional testing in each mode is difficult. It is also difficult to change the salinity and temperature of the seawater during the tests. Thus, the designer of the power plant does not know how the mode of its operation will change when the ship (ship) in the World Ocean is different. This indicates the need to improve the methods of thermal and hydrodynamic calculations of SHE with their integration into the overall design system. Under these conditions, the problem of using integrated CAD SHE is of particular relevance.

Mechanized installation for molding of wood-concrete panels

The article presents new technical solutions aimed at improving the performance of the installation for the molding of wood-concrete slabs. Calculation and design of rotary wheel racks which provide movement of installation in two mutually perpendicular directions is made; the proportioning bunker; conveyor that distributes and discharges the ready mortar into the formwork with two pneumatic cylinders; frames of plate forming installation. The study of the frames of plate forming installation, proportioning bunker and conveyor. Engineering analysis was carried out in CAE system ANSYS. Engineering analysis included five types of calculations: calculation of stiffness with rigid and elastic grip conditions, modal analysis, dynamic calculation, thermal and thermal-deformation calculations. The obtained results of the engineering analysis allowed us to conclude that the deformation of the frames is insignificant, that is, their rigidity provides the required accuracy of the manufacture of plates and the accuracy of the position of the proportioning bunker relative to the conveyors. The carried out measures on modernization of plate forming installation provided increase in productivity approximately in 2 times.

АНАЛИЗ НАПРЯЖЕННО – ДЕФОРМИРОВАННОГО СОСТОЯНИЯ ЗАКЛЕПОЧНОГО СОЕДИНЕНИЯ С ПОМОЩЬЮ CAE СИСТЕМЫ ABAQUS

The method for analyzing of stress-strain state characteristics of unloaded riveted joints performed with OST 1 11781-74 rivets has been developed using Coupled Euler-Lagrange finite element approach implemented in the CAD / CAE system Abaqus. A comparative analysis of the stress-strain state characteristics of the examined riveted joint’s finite element models using the Lagrangian and the Coupled Lagrangian-Eulerian finite element approaches has been conducted. A three- dimensional finite element model based on the CLE method has been proposed for further study of fatigue strength and durability of the loaded riveted joints.

О численной оценке эффективных характеристик периодических ячеистых структур с использованием балочных и оболочечных конечных элементов с помощью CAE Fidesys

Развитие аддитивных технологий (3D-печати) сделало возможным изготовление деталей и изделий регулярной пористой и ячеистой структуры (с целью облегчения конструкции). При этом характерный размер ячейки намного меньше масштаба целого изделия. Численные прочностные и смежные с ними расчёты подобных конструкций требуют предварительной оценки эффективных характеристик такой ячеистой структуры. В данной статье представлена методика численной оценки эффективных упругих характеристик регулярных ячеистых структур, основанная на численном решении краевых задач теории упругости на ячейке периодичности. К ячейке последовательно прикладываются различные периодические граничные условия в виде связей, наложенных на перемещения противоположных граней ячейки. Для каждого вида граничных условий решается краевая задача теории упругости, полученное в результате решения которой поле напряжений осредняется по объёму. Эффективные свойства ячеистого материала оцениваются в виде обобщённого закона Гука.В работе рассматриваются композиционные материалы на основе жёсткого решётчатого каркаса, заполненного более мягким материалом. Расчёты проводятся методом конечных элементов с помощью отечественной CAE-системы «Фидесис». При этом в ряде расчётов для моделирования решётчатого каркаса используются конечные элементы балочного типа. В некоторых расчётах, помимо каркаса и матрицы, учитывается наличие тонкого слоя связующего между ними. Этот слой моделируется при помощи конечных элементов оболочечного типа.Приводятся графики сравнения результатов расчётов композиционных материалов с решётчатым каркасом с моделированием каркаса балочными элементами и результатов аналогичных расчётов, в которых каркас моделируется трёхмерными конечными элементами. Также приводятся графики сравнения результатов расчётов, в которых слой связующего моделируется оболочечными элементами, с результатами аналогичных расчётов, в которых связующее моделируется трёхмерными элементами. Графики показывают, что при достаточно тонких элементах каркаса (либо при достаточно тонком слое связующего) результаты получаются довольно близкими, что подтверждает применимость балочных и оболочечных элементов для численного решения таких задач.

Kinematic analysis of a planetary mixer mechanism

The production of dry building mixtures is currently one of the most promising areas of the building materials industry due to the widespread use of its products. The mixers with a planetary movement of working bodies are best suited among the wide variety of designs of mixers for the production of these products. One of the drawbacks of planetary mixers is the contamination of the planetary gear and the ingress of lubricants into finished products. To eliminate this disadvantage, a protective diaphragm was installed to separate the tank and the drive part. The motion simulation of the rotator was created using the CAD / CAM / CAE system NX.

УСТАНОВКА ФОРМОВАНИЯ ДРЕВЕСНО-БЕТОННЫХ ПЛИТ

The article presents an approach to the creation of complex mechanical systems, consisting in a combination of automated design systems of various types. This allows not only implementing multivariate design using CAD-systems, but also achieving optimal design solutions for several criteria simultaneously using CAE-systems. Thus, a multi-criteria design problem can be solved. The article presents new design solutions aimed at improving the performance of the installation for the molding of wood-concrete plates. Calculations are made and the designs are presented: rotary wheel racks, which provide movement of the unit in two mutually perpendicular directions; dosing hopper,a conveyor that dispenses and discharges the finished mortar into the formwork using two pneumatic cylinders; plate forming installation frames; batch hopper frames; conveyor frame.The results of the engineering analysis of the frames for the installation of plate molding, metering hopper and conveyor are presented.Engineering analysis was carried out in the ANSYS CAE system. Engineering analysis included five types of calculations: the calculation of stiffness with the conditions of rigid and elastic fastening; modal; dynamic; thermal and thermal-deformational. The analysis of the obtained calculation results allowed making a conclusion about the insignificance of static and dynamic deformation of the frames. The assessment of the thermal deformation state of the elements of the carrier system of the installation for molding wood-concrete plates showed that the magnitude of the temperature displacements is comparable to the dynamic ones.

СПЕЦИАЛЬНЫЙ МЕТЧИК ДЛЯ НАРЕЗАНИЯ ВНУТРЕННИХ МЕЛКОРАЗМЕРНЫХ РЕЗЬБ

The paper presents the original design of a special tap for cutting precise threads. Distinctive design features of the tap are: the presence of the rear threaded guide that together with the copier threaded sleeve device perceives the axial forces and provides the tap axial feed strictly corresponding to the step of the thread being cut, excluding its breaking under the action of axial forces; the presence of a smooth front guide part with the direction on the cut hole, to reduce the influence of radial forces leading to the breakdown of the thread due to radial vibrations of the tap; the presence of the chamfer that implements the most technological cutting scheme such as flank infeed. A prototype of a special tap made on a turning and milling machine tool is presented, confirming the manufacturability of the proposed tool design. Research conducted in the field of engineering analysis with the CAE system Ansys shows a significant increase in structural rigidity and in natural frequencies.

Design and Implementation Method for Supporting Complex CAE Software System Module Development

The use of customizable or combined modular software products to meet the growing personalization needs of users has become one of the major development directions of the software market in the future. Based on the modular design idea, a highly open CAE software architecture for HAJIF software system is proposed, and a special modular design method is clarified. According to the analysis process of aircraft structural strength, a spatial surface interpolation method based on RBF is proposed for the problem of distributed load transfer to finite element load on space curved structure. The problem is solved well and modularized. The modular design of CAE software is clear, and it can design the CAE system comprehensively, improve the development environment, shorten the development cycle, and have important significance for accelerating CAE software customization.

CAD IN GRAPHIC TRAINING

The main criterion for high efficiency of educational services is the structural and semantic correspondence between learning outcomes and the real needs of highly developed production specialists. Worldwide betting is being done on digital production technologies, in particular, CAD and CAE computer systems. The purpose of our research is to determine and theoretically substantiate the essence of the problem of training future engineering and technical specialists in institutions of higher technical education in Ukraine and to reveal the fundamentals of innovative methods of teaching graphic disciplines using CAD at all stages of the educational process. To achieve this goal, the following research methods were used: theoretical - analysis, synthesis, systematization in order to determine the state and prospects of the elaboration of the studied problem; empirical – an experiment that was to identify the features of the innovative methods of preparing future engineering and technical specialists in technical institutions of higher education using CAD tools, studying the level of students' readiness to use the CAD and CAE system. The result of our study was an innovative method of training future engineering and technical specialists in technical institutions of higher education using CAD tools, which provides for a consistent, integrated use of CAD in the educational process (from the first year to the master's work). The proposed technique guarantees high-quality graphic training, the formation of a highly qualified specialist in accordance with the modern needs of an innovative enterprise. The analysis and experimental studies that were based on the Zhytomyr State Technological University suggest that the role of modern computer-aided design systems is growing rapidly, so it is important to use CAD in the educational process of future engineering and technical specialists. First of all, it concerns the construction of design documentation in CAD-systems, the analysis of products based on CAE-systems, along with the classical disciplines provide a deeper and better learning of educational material by students.

Calculation of the effective properties of the prestressed nonlinear elastic heterogeneous materials under finite strains based on the solutions of the boundary value problems using finite element method

This paper describes the approach and algorithms for numerical estimation of the effective properties of the prestressed nonlinear elastic heterogeneous materials under finite strains. To numerically evaluate effective properties on a representative volume (or periodicity cell), a series of sequences of elasticity problems differing in the type of the applied boundary conditions is solved. In all the problems being solved, along with the specially applied boundary conditions, the model undergoes the same predetermined prestress. In addition, a separate problem is being solved, in which, besides the prestressed state, zero displacement of the model boundary are set. The results of solving each problem in the form of stress tensors are averaged over the volume. Numerical calculations were carried out using the Fidesys Composite software module of the Fidesys CAE system using the finite element method. The paper presents the solution to a number of problems to estimate the effective coefficients of the porous material prestressed by pore pressure. Dependence graphs of effective properties on porosity and on size of pore pressure are constructed.

Parameter's Optimization of Surface Plastic Deformation Corrosion-resistant Steel by Computer Simulation

Abstract The knurling of corrosion-resistant steel 95X18 (the nearest analog is AISI 440B, AISI 440C, AISI A756, DIN-1.4125, SUS440C, Z100CD17) simulation with finite element method is investigated in the paper. Diagram stresses, strains and displacement are calculated by using CAE system SolidWorks. Dependence of strengthening area on processing tools geometry and loaded force are investigated. We proposed the algorithm of knurling parameters optimization by using a computer simulation. The correlation between simulation and experimental data was found.

Free Vibrations of Thin-Walled Box-Section Bars Allowing for Shear Strains

Purpose. The purpose is to study free vibrations of thin-walled bar with combined bisymmetrical section allowing for the effects of shear strains.Methods. We used the main hypothesis of V.Z. Vlasov concerning thin-walled bars. Solving motion equations analytically, we used the method of initial parameters and the known methods for differential equations solution. In the natural experiment we applied Autodesk Inventor system. In the course of the natural experiment on shaker, we used the method of smooth change in the frequency of sinusoidal vibrations.Results. We provide the analytical solutions of the shapes and the natural frequencies of thin-walled bar with combined bisymmetrical section allowing for shears caused by bends and constrained torsion. We compared the results of the calculations conducted in CAE system and the results of the full-scale experiment to determine the frequencies of vibrations of box beam.Conclusions. The results showed that the analytical calculations are in good compliance with the results of numerical and physical experiments and can be used for dynamic calculations of thin-walled structural elements, in particular, for the prevention of the destruction of structures in the event of resonance phenomena.