Send your good work in the knowledge base is simple. Use the form below

Students, graduate students, young scientists who use the knowledge base in their studies and work will be very grateful to you.

Posted on http://www.allbest.ru/

MINISTRY OF EDUCATION AND SCIENCE OF THE RUSSIAN FEDERATION

Federal State Budgetary Educational Institution

higher professional education

"SOUTH URAL STATE UNIVERSITY"

(national research university)

Branch of the State Budget Educational Institution of Higher Professional Education "SUSU" (NRU) in Ust-Katav

Department of Mechanical Engineering

Specialty 151900 - Mechanical Engineering Technology

Essay

“Features of CAD/CAM/CAE systems”

in the discipline "Fundamentals of mechanical engineering technology"

Supervisor:

Sergeev S.V.

Completed:

Kuzin S.S.

Ust-Katav 2015

Introduction

1. Purpose of modeling systems

2. History of development

3. General classification of CAD/CAM/CAE systems

4. Benefits of use

Conclusion

Bibliography

Introduction

Today, the word “CAD” means much more than just a software and hardware system for performing design work using computers, and often this term is used, first of all, as a convenient abbreviation to designate a large class of automation systems. This is due to the fact that over the past 10-15 years, such systems have come a long way from “electronic drawing boards” of the first generation, intended mainly for machine preparation of design documentation, to modern systems that automate almost all processes associated with the design and manufacture of new products, be it a part, a machine assembly or an entire car, aircraft or building.

Of course, the more complex the product being developed, the more complex and multifunctional the CAD system should be. Enterprise-scale design systems abroad are usually defined as CAD/CAM/SAE- systems, computer-aided design functions are distributed in them as follows: modules CAD- for geometric modeling and computer graphics, subsystem modules MYSELF- for technological preparation of production, and modules SAE- for engineering calculations and analysis to verify design solutions. Thus, the modern system CAD/CAM/CAE is capable of providing automated support for the work of engineers and specialists at all stages of the design and manufacturing cycle of new products.

Each CAD system is based on a certain mathematical model that formalizes the description and functioning of the designed products, and the processes of their manufacture. And the nature of the products and production processes impose their own specifics on the methods of their mathematical modeling. Ultimately, this specificity leads to a significant difference in design systems and the conditions for their use.

1 . Purpose

CAD systems are designed to solve design problems and prepare design documentation (they are more commonly referred to as CAD computer-aided design systems). As a rule, modern CAD systems include modules for modeling a three-dimensional three-dimensional structure (parts) and designing drawings and text design documentation (specifications, statements, etc.). Leading three-dimensional CAD systems make it possible to realize the idea of an end-to-end cycle for the preparation and production of complex industrial products.

In its turn, CAM-systems are designed for designing the processing of products on machines with numerical control (CNC) and issuing programs for these machines (milling, drilling, erosion, punching, turning, grinding, etc.). CAM-systems are also called systems for technological preparation of production. Currently, they are practically the only way to manufacture complex-profile parts and reduce their production cycle. IN CAM- systems use a three-dimensional model of the part created in CAD-system.

SAE-systems represent a broad class of systems, each of which allows solving a specific calculation problem (group of problems), ranging from strength calculations, analysis and modeling of thermal processes to calculations of hydraulic systems and machines, calculations of casting processes. IN CAE-systems also use a three-dimensional model of the product created in CAD-system. CAE-systems are also called engineering analysis systems.

There is a non-profit industry organization CAD Society dealing with issues of popularization CAD/CAM/CAE-systems in the world.

2 . History of development

History of market development CAD/CAM/CAE-systems can be fairly roughly divided into three main stages, each of which lasted approximately 10 years.

The first stage began in the 70s. In the course of it, a number of scientific and practical results were obtained that proved the fundamental possibility of designing complex industrial products. During the second stage (80s) they appeared and began to spread rapidly CAD/CAM/CAE- mass application systems. The third stage of market development (from the 90s to the present) is characterized by improved functionality CAD/CAM/CAE-systems and their further distribution in high-tech industries (where they have best demonstrated their effectiveness).

At the initial stage, users CAD/CAM/CAE- systems worked on graphic terminals connected to mainframes produced by companies IBM And Control Data, or mini-computer PDP/11(from Digital Equipment Corporation) And Nova(production Data General). Most of these systems were offered by companies that sold both hardware and software (in those years, the leaders of the market in question were companies Applicon, Auto-Trol Technology, Calma, Computervision and Intergraph). Mainframes of that time had a number of significant shortcomings. For example, when too many users shared system resources, the load on the CPU increased to the point that it became difficult to work interactively. But at that time users CAD/CAM/CAE-systems had nothing to offer except cumbersome computer systems with division of resources (according to set priorities), because microprocessors were still very imperfect. According to Dataquest, in the early 80s. cost of one license CAD-systems reached $90,000.

The development of applications for designing printed circuit board patterns and chip layers made possible the emergence of highly integrated circuits (on the basis of which modern high-performance computer systems were created). During the 80s. a gradual transfer was carried out CAD-systems from mainframes to personal computers (PCs). At the time, PCs were faster than multitasking systems and were cheaper. According to Dataquest, by the end of the 80s. price CAD-licenses dropped to approximately $20,000.

It should be said that in the early 80s. There was a stratification of the CAD systems market into specialized sectors. The electrical and mechanical segments of CAD systems have been divided into the ECAD and MCAD industries. Manufacturers of workstations for PC-based CAD systems have also gone in two different directions:

* some manufacturers have focused on architecture IBM PC microprocessor based Intel x86;

* other manufacturers preferred to focus on architecture Motorola(PCs produced by her ran the OS Unix from AT&T, OS Macintosh from Apple And Domain OS from Apollo).

Performance CAD- PC systems at that time were limited to 16-bit addressing of microprocessors Intel And MS DOS. As a result, users creating complex solid models and structures preferred to use graphical workstations running OS Unix with 32-bit addressing and virtual memory, allowing you to run resource-intensive applications.

By the mid-80s. architecture capabilities Motorola were completely exhausted. Based on the advanced concept of microprocessor architecture with a truncated instruction set ( Reduced Instruction Set Computing- RISC) new chips were developed for workstations running OS Unix(For example, Sun SPARC). RISC architecture has significantly improved performance CAD-systems

Since the mid-90s. the development of microtechnology has allowed the company Intel reduce the cost of production of their transistors, increasing their performance. As a result, it became possible for PC-based workstations to compete successfully with RISC/Unix-stations. Systems RISC/Unix were widespread in the 2nd half of the 90s, and their position is still strong in the integrated circuit design segment. But now the OS MS Windows almost completely dominates in the fields of structural and mechanical engineering, printed circuit board design, etc. According to Dataquest And IDC, since 1997, workstations on the platform Windows NT/Intel (Wintel) began to overtake Unix-stations by sales volumes. Over the past since the beginning of appearance CAD/CAM/CAE-systems over the years, the cost of a license for them has dropped to several thousand dollars (for example, $6000 for Pro/Engineer).

3 . General classificationCAD/CAM/CAE -Withsystem

Over almost 30 years of existence CAD/CAM/CAE-systems, their generally accepted international classification has developed:

* Drawing-oriented systems, which appeared first in the 70s. (and are still successfully used in some cases).

* Systems that allow you to create a three-dimensional electronic model of an object, which makes it possible to solve problems of its modeling right up to the moment of manufacturing.

* Systems that support the concept of a complete electronic description of an object ( EPD). EPD This is a technology that ensures the development and support of an electronic information model throughout the entire life cycle of a product, including marketing, conceptual and detailed design, technological preparation, production, operation, repair and disposal. When using EPD- the concept assumes the replacement of component-centric sequential design of a complex product with a product-centric process performed by design and production teams working collectively. Due to development EPD-concepts and grounds appeared for the transformation of autonomous CAD-, CAM- And CAE-systems into integrated CAD/CAM/CAE-systems.

Traditionally there is also a division CAD/CAM/CAE- systems into systems of upper, middle and lower levels. It should be noted that this division is quite conditional, because Now there is a tendency for middle-level systems (in various parameters) to approach upper-level systems, and lower-level systems are increasingly ceasing to be simply two-dimensional drawing-oriented and becoming three-dimensional.

Examples of top-level CAD/CAM systems are Pro/Engineer, Unigraphics, CATIA, EUCLID, I-DEAS(all of them have a calculation part CAE).

Currently, there are two types of solid geometric kernels widely used in the market ( Parasolid from the company Unigraphics Solutions And ACIS from Spatial Technology). Most famous CAD/CAM-mid-level kernel-based systems ACIS are: ADEM (Omega Technology); Cimatron (Cimatron Ltd.); Mastercam (CNC Software, Inc.); AutoCAD 2000, Mechanical Desktop and Autodesk Inventor (Autodesk Inc.); Powermill(DELCAM); CADdy++ Mechanical Design (Ziegler Informatics GmbH); product family Bravo(Unigraphics Solutions), IronCad (VDS) etc. To the number CAD/CAM- mid-range kernel-based systems Parasolid belong, in particular, MicroStation Modeler (Bentley Systems Inc.); CADKEY 99(CADKEY Corp.); Pro/Desktop (Parametric Technology Corp.); SolidWorks (SolidWorks Corp.); Anvil Express (MCS Inc.), Solid Edge And Unigraphics Modeling (Unigraphics Solutions); IronCAD (VDS) and etc.

CAD-lower level systems (for example, AutoCAD LT, Medusa, TrueCAD, KOMPAS, BAZIS, etc.) are used only when automating drawing work.

4 . Benefits from use

CAD/CAM/CAE-systems occupy a special position among other applications, since they represent industrial technologies directly aimed at the most important areas of material production. Currently, it is a generally accepted fact that it is impossible to manufacture complex high-tech products (ships, aircraft, tanks, various types of industrial equipment, etc.) without the use of CAD/CAM/CAE-systems In recent years CAD/CAM/CAE-systems have evolved from relatively simple drawing applications to integrated software systems that provide unified support for the entire development cycle, from preliminary design to technological pre-production, testing and support. Modern CAD/CAM/CAE-systems not only make it possible to reduce the time it takes to introduce new products, but also have a significant impact on production technology, making it possible to improve the quality and reliability of manufactured products (thereby increasing their competitiveness). In particular, by computer modeling of complex products, the designer can fix inconsistencies and save on the cost of manufacturing a physical prototype. Even for something as relatively simple as a telephone, a prototype can cost several thousand dollars, an engine model can cost half a million dollars, and a full-scale aircraft prototype can cost tens of millions of dollars.

For example, the company's development project is widely known Shorts Brothers fuselage for business class aircraft Learjet 45 using modern CAD/CAM/CAE-systems The results of the project are simply impressive. Previously the company Shorts used wire modeling of parts in design work. In the created Shorts Brothers Aircraft fuselages typically contained up to 9,500 structural parts. Similar projects could require more than 440,000 man-days (up to 4 years to complete the project).

Fuselage Learjet 45 turned out to be not only the most complex among the existing ones, but was also developed in a significantly shorter time (by 40%) than its predecessors. In addition, the quality of parts and the fuselage assembly itself was improved approximately 10 times, and the total number of parts was reduced by 60% (with a 90% reduction in the volume of major alterations compared to previous projects). Overall, the company Shorts was able to reduce the number of components from 9500 to 3700 (by 60%). The total time for design and technological preparation of production was reduced to 125,000 man-days. The total development and technological preparation time for production is up to 60,000 man-days, and the entire development cycle of a standard fuselage has been reduced from 4 years to 1.5-2 years.

This leads to the benefits of using CAD/CAM/CAE-systems:

* Improving design methods, in particular, the use of multivariate design and optimization methods to find effective options and make decisions.

* Increasing the share of creative work of the design engineer.

* Improving the quality of design documentation.

* Improving the management of the project development process.

* Partial replacement of full-scale experiments and prototyping with computer modeling.

* Reducing the volume of testing and fine-tuning of prototypes as a result of increasing the level of reliability of design solutions and, consequently, reducing time costs.

computer-aided design system

Conclusion

The needs of modern production dictate the need for the global use of information and computer technologies at all stages of the product life cycle: from pre-design research to product disposal. The basis of information technologies in the design and production of complex objects and products today are full-scale, fully functional industrial CAD systems (CAD/CAM/CAE systems). The active use throughout the world of “light” and “medium” CAD systems on personal computers for the preparation of drawing documentation and control programs for CNC machines and the convergence of the capabilities of personal computers and “workstations” in design automation have prepared two trends in the development and use of CAD systems, which Recently observed:

ѕ the use of full-scale CAD systems in various industries for the design and production of products of varying complexity;

* integration of CAD with other information technologies.

These trends suggest that in the very near future, production efficiency will be largely determined by the effectiveness of the use of industrial CAD systems at enterprises.

Bibliography

1. Kunwu Lee. CAD Basics. - St. Petersburg: Peter, 2004.

2. B. Hawks. Computer-aided design and production. - M.: Mir, 1991.

3. “Computer Press”, NN “1-12,1997 - ISSN 0868-6157.

4. V. Klishin, V. Klimov, M. Pirogova. Integrated Computervision technologies. Open systems, # 2, 1997. p. 37-42.

Posted on Allbest.ru

...

Numerical methods

CAE systems can use the following mathematical methods in their work:

Finite element method(FEM, Finite element analysis, FE analysis) - a numerical method for solving partial differential equations, as well as integral equations that arise when solving problems of applied physics. The method is widely used to solve problems in solid mechanics, heat transfer, hydrodynamics and electrodynamics.
Finite difference method- a numerical method for solving differential equations based on replacing derivatives with difference schemes. It is a grid method.
Finite volume method(Control volume method) - a numerical method for integrating systems of partial differential equations.

CAE Examples

ABAQUS - universal FE analysis system with built-in pre-/post-processor;
ADAMS - multibody dynamics modeling and calculation system;
ANSYS - universal FE analysis system with built-in pre-/post-processor;
APM WinMachine 2010 - a domestic universal system for design and calculations in the field of mechanical engineering, including FE analysis with a built-in pre-/post-processor;
APM Civil Engineering 2010 - a domestic universal FE analysis system with a built-in pre-/post-processor for the design and calculation of metal, reinforced concrete, reinforced masonry and wooden structures;
Autodesk Simulation is a complex of universal FE analysis systems with built-in pre-/post-processors (the complex includes Autodesk Simulation CFD - a computational fluid dynamics program, Autodesk Simulation Mechanical - a program for mechanical and thermal analysis of products and structures, Autodesk Simulation MoldFlow - a program for modeling the process of molding plastic products under pressure);
ESAComp is a software system for finite element calculations of thin-walled multilayer plates and shells;
EULER (Euler) - software package for automated dynamic analysis of multi-component mechanical systems;
FEM-models is a software package for modeling and analysis using the finite element method. The program specializes in geotechnical calculations, joint calculations of building-foundation systems;
Femap is a CAD-independent pre- and post-processor for performing engineering analysis using the finite element method;
ASONIKA - Automated system for ensuring the reliability and quality of equipment (a complex of subsystems for modeling radio-electronic equipment using FEM and MKR methods);
CAE Fidesys - universal FE analysis system with built-in pre-/post-processor;
HyperWorks (HyperMesh, RADIOSS, OptiStruct, AcuSolve, etc.) - a universal software platform for finite element analysis systems;
Moldex3D - software system for finite element modeling of reinforced plastic injection molding;
MSC.Nastran - universal FE analysis system with MSC.Patran pre-/post-processor;
NEiNastran - universal software system for finite element analysis;
NX Nastran - a universal FEA analysis system;
OpenFOAM is a freely distributed universal system for spatial modeling of continuum mechanics;
QForm 2D/3D - a specialized software package for modeling and optimizing technological processes of volumetric stamping;
SALOME - platform for carrying out MSS calculations (data preparation - calculation monitoring - visualization and analysis of results);
SolidWorks Simulation - a family of calculation packages in the SolidWorks environment (strength, dynamics, heat, frequency analysis, gas-hydrodynamics, etc.);
SAMCEF - universal FE analysis system with pre-post processor SAMCEF Field;
Simmakers CAE Platform is a software platform for performing numerical simulation of physical and technological processes with a built-in pre-/post-processor.
SimulationX is a software package for modeling and analyzing the dynamics and kinematics of vehicles, industrial equipment, electric, pneumatic and hydraulic drives, internal combustion engines, hybrid engines, etc.
STAR-CD - universal MKO analysis system with pre-/post-processor;
STAR-CCM+ - universal MKO analysis system with pre-/post-processor;
T-FLEX Analysis - a universal FE analysis system with a built-in pre-/post-processor;
CAElinux is a distribution of the Linux operating system that includes a number of free CAE programs, including OpenFOAM and SALOME.
Universal Mechanism (UM) - a software package designed for modeling the dynamics and kinematics of plane and spatial mechanical systems;
FRUND - complex for modeling the dynamics of systems of solid and elastic bodies;
MBDyn is a system for complex analysis and calculations of nonlinear dynamics of solid and elastic bodies, physical systems, smart materials, electrical networks, active control, hydraulic networks, aerodynamics of airplanes and helicopters. * Distributed under the terms of the GNU GPL 2.1 license;

Categories of tasks for which CAE (computer aided engineering) systems are most often used. Architecture and operating principle of a standard CAE package, main examples of systems: Salome, ANSYS (Swanson Analysis Systems) and MSC.Nastran, their characteristics.

Send your good work in the knowledge base is simple. Use the form below

Students, graduate students, young scientists who use the knowledge base in their studies and work will be very grateful to you.

Posted on http://www.allbest.ru/

Introduction

The emergence and subsequent development of high-performance computing technologies was caused by the need to perform mathematical calculations for various studies. Despite the fact that the methods and algorithms for these calculations are not particularly complex, the volume of the calculations themselves is so significant that it is almost impossible for a small group of researchers to complete them in an acceptable time frame and with the proper quality.

The first engineering packages were created in the late 60s and early 70s specifically to automate routine calculations. In English-language literature, such packages are designated by the abbreviation CAE (computer aided engineering), and in Russia this concept is part of CAD (computer aided design systems). The tasks for which CAE systems are most often used can be divided into the following categories:

· strength calculations of various parts and assemblies (calculation of elastoplastic deformations and stresses);

· hydrodynamic calculations (calculation of the characteristics of various single- and multiphase flows, as well as their evolution over time);

· thermodynamic calculations (calculation of heating and cooling of parts and assemblies);

· calculation of electric, magnetic and electromagnetic fields;

· various combinations of previous types of tasks.

architecture system principle operation

1. Architecture and operating principle of a standard CAE package

Most CAE packages are based on the finite element method. The idea of this method is to replace a continuous function describing the phenomenon or process under study with a discrete model, which is built on the basis of a set of piecewise continuous functions defined on a finite number of subdomains. Each such subregion is finite and represents a part (element) of the entire region, which is why they are called finite elements. The geometric region under study is divided into elements in such a way that on each of them the unknown function is approximated by a test function. This partition is called computational grid.

As an example, consider a cylindrical steel rod, one end of which is placed in a fire. The fragment of the rod exposed to the flame actively heats up. That is, a heat source acts on its cylindrical surface. The rest of the rod is heated only due to the phenomenon of thermal conductivity - the transfer of heat from hot areas to colder ones. In the roughest case, the rod can be divided into two parts: with a heat source on the cylindrical surface and with a heat source in the section of the cylinder parallel to the base. Thus, one complex (complex) task is divided into two simpler ones.

However, the resulting problems are still too complex to be solved in a general form, since their solutions represent complex exponential dependencies on coordinates and time. To simplify, you can divide the rod into smaller fragments (elements), and in the elements near the surface, set the heat release throughout their entire volume, and not just at the boundary (if certain conditions are met, this is justified), and in the remaining elements, due to their smallness, look for an approximate solution in the form of a simpler relationship (linear or quadratic). In this case, a complex system of differential equations for an element is reduced to a simpler system of algebraic equations. With this approach, finding a solution for each individual problem will be much easier.

The complexity of this approach lies in the need to solve a large number of such simplified problems. Modern problems use grids with tens and hundreds of millions of elements. Therefore, engineering packages are created using parallel programming technologies to provide the necessary computing power.

Creating a good computational mesh is also a non-trivial task. This is due to the fact that real machine parts have complex geometry and it is necessary to divide them into such elements that the approximate solutions do not differ much from the exact ones. Therefore, in addition to the CAE packages themselves, there are a large number of applications that perform only one important function: constructing a computational mesh. In English-language literature, such applications are called mesher.

The module responsible for solving the system of equations corresponding to the generated mesh is called solver(in English literature: solver). It receives all the input data and processes it based on the methods implemented in it.

Currently, computer modeling using CAE systems makes up a significant portion of the work in any serious scientific or engineering project. There are well-known commercial solutions on the CAE systems market, for example, ANSYS, Deform, Simulia (formerly Abaqus) and others. The cost of licenses for these products amounts to hundreds of thousands and millions of rubles, but there are also CAE systems related to free software.

Among the free CAE packages, the most famous are: Salome, OpenFoam, Elmer. The main disadvantages of these packages include an undeveloped interface and lack of documentation, especially in Russian. However, the possibility of using them on any number of processors without any financial costs for purchase makes free CAE systems very attractive for use in small companies and educational institutions.

2. ExamplesCAE-systems

Salome

Most CAE packages are complete software packages that contain everything that is necessary to perform finite element modeling. Salome is a platform that provides task pre-processing and post-processing functions ( pre-processing And post-processing), i.e. there are definitions of geometry, construction of meshes, definition of the “trajectory” of calculations, visualization of results, etc. It lacks the most important components - solvers, but the Salome platform can be expanded with third-party free or commercial modules.

The main purpose of the Salome platform is to create a kind of unified environment, after studying which the user will be able to process the source and received data in a familiar shell, regardless of the solver used. It is possible to connect ANSYS solvers and other commercial packages to this shell by writing special modules or control scripts that can be written in Python or C++.

The platform's internal language is Python, and the platform itself has a built-in Python console that can be used to run custom scripts and automate the processing of many common tasks (batch processing).

ANSYS

Finite element package. ANSYS, Inc. For 35 years, it has been one of the leaders of the SAE market, developing and offering a wide range of software products for automated engineering analysis. Founded by Mr. John Swanson, the company was originally called Swanson Analysis Systems, and offered only the ANSYS universal finite element package. Later, the program gave its name to the company itself. Today, the company is the leader in the settlement systems market both in terms of sales volume and the number of workstations of its software used around the world, and the breadth of the line and applicability of software products: ANSYS, AutoDYN, CFX, Fluent, ICEM, Maxwell. This is just a short list.

The ANSYS product line is wide and covers all the needs of the designer at all stages of his work, starting with the construction or modification of the geometric and mesh model, then moving on to the effective solution of the problem, and ending with the processing, presentation and documentation of the results. ANSYS SOLVES is a tool for solving problems of strength, thermophysics, and electromagnetism.

MSC.Nastran

general characteristics. MSC.Software's flagship product, MSC.Nastran, is the best finite element software system on the market. In an industry where unreliable results can result in millions of dollars in additional development costs, MSC.Nastran has proven its accuracy and efficiency for over 30 years. Constantly developing, it accumulates the advantages of the latest techniques and algorithms and therefore remains the leading finite element analysis program.

MSC.Nastran provides a complete set of calculations, including the calculation of stress-strain states, natural frequencies and mode shapes, stability analysis, solving heat transfer problems, the study of steady and unsteady processes, acoustic phenomena, nonlinear static processes, nonlinear dynamic transient processes, calculation of critical frequencies and vibrations of rotary machines, analysis of frequency characteristics under the influence of random loads, spectral analysis and study of aeroelasticity. It is possible to simulate almost all types of materials, including composite and hyperelastic. Advanced features include superelement (substructure) technology, modal synthesis, and the DMAP macro language for creating custom applications.

Along with structural calculations, MSC.Nastran can also be used to optimize projects. Optimization can be carried out for problems of statics, stability, steady and unsteady dynamic transients, natural frequencies and mode shapes, acoustics and aeroelasticity. And all this is done simultaneously by varying the parameters of the shape, size and properties of the project. Due to their efficiency, optimization algorithms handle an unlimited number of design parameters and constraints. Weight, stresses, displacements, natural frequencies and many other characteristics can be considered either as objective functions of the design (in which case they can be minimized or maximized) or as constraints. Sensitivity analysis algorithms allow you to study the influence of various parameters on the behavior of the objective function and manage the process of finding the optimal solution.

The extensive capabilities of the MSC.Nastran optimization function allow it to be used for automatic identification of a computer calculation model and experiment. The objective function is determined in the form of minimizing the discrepancy between the results of calculation and experiment; the least reliable design parameters of the structure are selected by varying parameters. As a result of optimization, MSC.Nastran produces a new computer model that fully matches the experimental model. MSC.Nastran is the only finite element program that can do this automatically.

MSC.Nastran also includes a unique design optimization feature with unlimited geometric changes (changing the geometric topology of an object) while minimizing weight and satisfying strength boundary conditions. This function allows you to use MSC.Nastran for the automatic design of power circuits of structures, when, based on a volumetric solid workpiece, MSC.Nastran automatically creates an openwork optimal design that best satisfies the specified conditions.

MSC.Nastran is also used for planning experiments (determining sensor locations) and assessing the completeness of the obtained experimental data.

With the help of MSC.Nastran, the problems of modeling control systems and thermal control systems are also solved, taking into account their impact on the structure.

Based on the automatic restart capabilities in MSC.Nastran, complex multi-step studies of the structure’s operation are carried out both when loading conditions, boundary conditions and any other design parameters change, and when moving from one type of analysis to another.

MSC.Nastran is based on proven element technology and reliable numerical methods. The program allows you to simultaneously use h- and p-elements in the same model to achieve calculation accuracy with minimal computer resources. Super high-order elements of approximation - p-elements - well reflect the curvilinear geometry of the structure and provide high accuracy in detailed stress calculations. These elements automatically adapt to the desired level of accuracy. Sparse matrix numerical methods, used in any type of calculation, dramatically increase the speed of calculations and minimize the amount of disk memory required, which increases the efficiency of data processing.

The close connection of MSC.Nastran with MSC.Patran provides a fully integrated environment for modeling and analysis of results. All leading manufacturers of pre- and post-processors, as well as computer-aided design systems, taking into account the undeniable leadership of MSC.Nastran in the market of finite element software products, provide direct interfaces with this system. As a result, MSC.Nastran can be flexibly integrated into any design environment you have.

MSC.Nastran runs on personal computers, workstations and supercomputers, and provides vector and parallel data processing capabilities on computers that support these functions.

MSC.Nastran is:

Efficiency in solving large problems due to:

Application of the algorithm for processing "sparse" matrices

Automatic internal renumbering of matrices to reduce tape width

· Possibility of using “restart” in order to use the results already obtained at that moment

Application of parallel and vector computing algorithms

Posted on Allbest.ru

...

Parameter name	Meaning
Article topic:	Lecture 18. CAE systems
Rubric (thematic category)	Electronics

Engineering calculations cae. Computer modeling of products and CAE systems

Send your good work in the knowledge base is simple. Use the form below

Similar documents

Numerical methods

CAE Examples

Categories of tasks for which CAE (computer aided engineering) systems are most often used. Architecture and operating principle of a standard CAE package, main examples of systems: Salome, ANSYS (Swanson Analysis Systems) and MSC.Nastran, their characteristics.

Send your good work in the knowledge base is simple. Use the form below

Introduction

· strength calculations of various parts and assemblies (calculation of elastoplastic deformations and stresses);

· hydrodynamic calculations (calculation of the characteristics of various single- and multiphase flows, as well as their evolution over time);

· thermodynamic calculations (calculation of heating and cooling of parts and assemblies);

· calculation of electric, magnetic and electromagnetic fields;

· various combinations of previous types of tasks.

architecture system principle operation

1. Architecture and operating principle of a standard CAE package

The module responsible for solving the system of equations corresponding to the generated mesh is called solver(in English literature: solver). It receives all the input data and processes it based on the methods implemented in it.

2. ExamplesCAE-systems

Salome

The platform's internal language is Python, and the platform itself has a built-in Python console that can be used to run custom scripts and automate the processing of many common tasks (batch processing).

ANSYS

MSC.Nastran

MSC.Nastran is also used for planning experiments (determining sensor locations) and assessing the completeness of the obtained experimental data.

With the help of MSC.Nastran, the problems of modeling control systems and thermal control systems are also solved, taking into account their impact on the structure.

Based on the automatic restart capabilities in MSC.Nastran, complex multi-step studies of the structure’s operation are carried out both when loading conditions, boundary conditions and any other design parameters change, and when moving from one type of analysis to another.

MSC.Nastran runs on personal computers, workstations and supercomputers, and provides vector and parallel data processing capabilities on computers that support these functions.

MSC.Nastran is:

Efficiency in solving large problems due to:

Application of the algorithm for processing "sparse" matrices

Automatic internal renumbering of matrices to reduce tape width

· Possibility of using “restart” in order to use the results already obtained at that moment

Application of parallel and vector computing algorithms

Similar documents