FEAWEB ASP Issue: 1.0 Stakeholder Needs Issue Date: 03/29/ /07/ Initial Description Marco Bittencourt

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1 )($:(%$63 6WDNHKROGHU1HHGV,VVXH

2 5HYLVLRQ+LVWRU\ 'DWH,VVXH 'HVFULSWLRQ $XWKRU 04/07/ Initial Description Marco Bittencourt &RQILGHQWLDO DPM-FEM-UNICAMP, 2000 Page 2

3 7DEOHRI&RQWHQWV 1. Objectives 5 2. Scope 5 3. References 5 4. Overview of the Product 5 5. Functionality Site Management Account Manager Hardware Provider Support system Web Service Provider Simulation Center Adaptive Finite Element Analysis Interface with Finite Element Packages Finite Element Mesh Generation Geometry Generation Simulation of Problems Optimization of Mechanical Components Visualization of Results Training Center Monthly Article Discussion List Question Box Problem Box Online Courses Usability Simple and Specific Computational Modules Internet Intranet Reliability Safety and Privacy Performance Short Response Time Supportability Windows and Linux Compatibility Business Rules and Regulations Interpretation of Results Technology Rules and Limitations 12 &RQILGHQWLDO DPM-FEM-UNICAMP, 2000 Page 3

4 11.1 Modular Environments. 12 &RQILGHQWLDO DPM-FEM-UNICAMP, 2000 Page 4

5 6WDNHKROGHU1HHGV 2EMHFWLYHV This document presents the main requirements and characteristics of an Internet and Intranet Application Service Provider (ASP) called FEAWEB (Finite Element Analysis WEBsite). FEAWEB will provide information and computational resources on the field of computational simulation of engineering problems. The high level requirements elicited by the development team will be listed on this document. 6FRSH This document lists the most general guidelines of the project with the goal of creating an initial vision about what will be developed. The contents of this document will interest all entities and people involved in this project. 5HIHUHQFHV 2YHUYLHZRIWKH3URGXFW The use of computational simulation, based mainly on the Finite Element Method (FEM), has increased strongly in the engineering companies along last 10 years. Hardware, software and trained personnel are the three most important requisites to apply simulation resources to engineering problems. In terms of hardware, there has been a continuous demand for more powerful computers due to the increase of the size and complexity of problems being solved. However, from the point of view of companies, the investment for purchasing and maintaining hardware over time involves considerable amount of financial resources. For instance, the annual maintenance cost for a PC computer is estimated in at least US$6, That cost is much higher for a workstation. Renting hardware resources accessible locally in the company facility or remotely through a network connection can be very attractive for small and medium size companies mainly. Concerning software, the mainstream analysis programs are designed to be general purpose tools, i.e., they deal with several kinds of engineering problems. In general, that feature implies complex user interfaces and requires very qualified and trained users. As the programs have become bigger, there is also an increasing demand for memory, disk space and processing speed. Because of the general purpose characteristic, the company in general will pay for software capabilities that it will never use. It seems that software for the solution of some specific engineering problems would require less hardware and training requirements and be more suitable for small and medium companies. In the context of computational simulation, hardware and software should be seen just as tools available to the solution of engineering problems. In general, they have been considered as PDJLFVROXWLRQER[HV which means that packages will obtain reasonable solutions easily in a short period of time. In general, this is not the case. Based on that, training should be the most important of the three requirements mentioned previously. Missed qualification is the major barrier to a wider dissemination of computational simulation techniques through the engineering departments of companies. It is very easy to see that by the comparison of the number of CAD and CAE package licenses installed in companies. When a CAD user draws a line, he or she does not need to know how the drawing line procedure was implemented. In general, users will have considerable skills after some training on the CAD package. The same fact is not necessarily true with simulation packages because they implement mathematical models and their solution through numerical methods. Hence, skills on the use of the software is not enough. It is also essential to have background on the implemented mathematical models and related numerical procedures. &RQILGHQWLDO DPM-FEM-UNICAMP, 2000 Page 5

6 Another important aspect is that basic mechanical concepts implemented on CAE packages are in their most general form. At engineering schools, those concepts have been taught after applying them to particular simple cases, which can be solved without computer aid. This implies on learning particular definitions of important concepts, which makes difficulty to understand what has been implemented on the packages. Consequently, enormous difficulties will arise to the user of computational analysis software and mistakes may be done. Assuming a very trained user on how to operate the analysis package, results obtained may be totally wrong if the mathematical framework is neglected. For instance, if one assumption is assumed which violates any of the hypotheses of the mathematical model, wrong results will be obtained. This fact is common in the engineering environment. Based on that, training and qualification are of central importance for the confident use of computational simulation. The following general steps are required to apply the FEM to engineering problems: 1. Generation of the geometric model of the component to be studied. This model can be drawn using a CAD package and imported to FEM software using standards formats (e.g., SAT, IGES, STEP) or direct reading of CAD files (e.g., Catia, Pro/E). Many times the CAD file is not adequate to be used in the FEM program. In this case, the CAD file has to healed or reworked in the FEM program. 2. Generation of the finite element mesh on the geometry. This requires a finite element mesh generation software. Automatic generation of meshes on three-dimensional geometry is one of the main practical difficulties to apply the FEM to engineering problems. 3. Definition of the physical and solution parameters of the problem such as loading, boundary conditions, material and geometric properties, accuracy and other. This kind of parameter may be problem dependent. They are specified on geometric (e.g., points, lines, surfaces, volumes) or finite element (e.g., nodes and elements) entities. 4. Solution of the discrete model to obtain an approximated solution of the problem. The solution can be improved by using error estimator and adaptive refinement strategies. Solution is the most intensive computing time consuming of all steps. 5. Visualization of results through color plots and tables of numerical results. 6. In the case of the application of structural optimization procedures, design sensitivity analysis and minimization procedures are required. Design variables, performance functional and restrictions must be defined. FEAWEB aims to address the three most relevant requirements described above. For that purpose, it will provide hardware, software, training and support services. In addition, general information related to the computational simulation field (e.g., interviews with experts, texts, discussion lists and many other) will be available. FEAWEB ASP will be composed by three main large subsystems as illustrated below. )($:(%$63 6,7( 0$1$*(0(17 6,08/$7,21 &(17(5 75$,1,1* &(17(5 &RQILGHQWLDO DPM-FEM-UNICAMP, 2000 Page 6

7 The Site Management subsystem will be responsible to manage services, homepages, databases, forms, billing system and all information supplied by the site. The Simulation Center subsystem will provide hardware and software resources to apply computational simulation based on the FEM to engineering problems. Finally, the Training Center subsystem will offer distance learning courses on many topics related to numerical simulation. )XQFWLRQDOLW\ 6LWH0DQDJHPHQW The Site Management subsystem will be responsible to manage the homepages, databases, forms, billing system, backup system, applications and all services supplied by FEAWEB. The following functionality will be available. $FFRXQW0DQDJHU This functionality will manage all features (e.g., registration, user account, password system, disk quota and other ) related to the user s data required to access the FEAWEB services. Users will be invited to register on the site by using appropriate forms without any charge. All registered user s data will be stored in a database. A system of passwords will be implemented to insure data privacy and confidentiality. Using their passwords, users will be able to access and manage services, information and preferences related to their accounts from any desktop running the supported operating systems (Windows and Linux) through the Internet or a local Intranet. Non-registered users will have access to a limited part of information and services available on the site. Users will be classified in categories according to some privileges. Access to the provided services will depend on the categories each user belongs to. For instance, registered users will have access to general information, tutorials, discussion lists, demonstration versions of the software environments, on-line interviews and other. But those users will not be able to access the simulation and training centers. To do that, users will have to change their account privileges and purchase the charged services wanted. Another category will be invited contributors. They will be responsible for some features such as discussion lists, question box and monthly article. The contributors will have access without charges to some charged services during the time they contribute to the site. Consultants will be another category. They will collaborate in the solution of problems left by users in the problem box. Consultants will have to provide some extra information when the registration form is filled such as their specialization areas. For users of the Simulation Center, an account will be provided with disk quota. This account will be necessary to store, download and upload the simulation files. A backup system will be provided to insure data integrity. Backup strategies based on the Linux system will be implemented. Private user data will be backed up upon request. Users of the Simulation and Training Centers will have also an account. For charged services, a billing system based on credit cards and invoices is required. Costs will be proportional to the software and hardware resources used, support and consulting services. Another possibility will be to charge a monthly fee to use the Simulation Center and individual fees for each online course of the Training Center and consulting services. Every time a registered user access a service of the Simulation Center, the following sequence of functions will be performed: password validation, analysis of user profile to check if the registered user has status to access that service, verification of available credits, presentation of the account information page, access to the requested service. Every time a registered user access an online course of the Training Center, the following sequence of functions will be performed: password validation, analysis of user profile to check if the registered user has status to access that service, subscription validation, presentation of the account information page, access to the requested service. &RQILGHQWLDO DPM-FEM-UNICAMP, 2000 Page 7

8 The Account Manager will run on the Web Server computer (see Hardware Provider section). +DUGZDUH3URYLGHU FEAWEB will provide hardware resources to run software used in the Simulation and Training Centers. These resources will be available from the homepages of the Simulation and Training Centers stored in the web server. After a request to run an application, the web server will select one of the application servers of FEAWEB to submit the job. The following picture illustrates the organization of the hardware available in FEAWEB based on one Web Server and several Application Servers. :(%6(59(5 $33/,&$7,21 6(59(5 $33/,&$7,21 6(59(5 $33/,&$7,21 6(59(5Q All computers will run the Linux operating system. A computer will work as the web server and provide basic services such as ftp, and lists. It will also manage the requests to run web based applications, select an application server and submit the process. The selection of an application server will be based on the loading of the computers available. The application servers will provide all the functionality for remote processing and web-based applications used in the Simulation and Training Centers. Synchronization of process, processing time, disk space estimates and status of remotely processed jobs are some of the required features. Initially, FEAWEB will have two application servers. Based on the site statistics (see Web Service Provider section bellow), more application servers will be installed. 6XSSRUWV\VWHP One of the main features of the ASP concept is to provide support for the services provided. For FEAWEB, support will be very important because of the missed background in numerical simulation of users. Support will be provided for the correct application of the software environments of the Simulation Center and also to the online courses and tutorials of the Training Center. Support will use resources such as , discussion lists, online interviews, chat, texts and others. :HE6HUYLFH3URYLGHU This feature is related to all functionality of the management and access to FEAWEB such as homepages, databases, services, statistics, information provider and others. FEAWEB intends to collect valuable information about Computational Simulation such as texts, congress announcements, interviews, links (e.g., software and hardware companies and bookstores), on-line presentations, articles and discussion lists. The information will be updated on a regular basis to give a dynamic feature to the site. All information will be developed in standard HTML looking for compatibility with Netscape and Explorer browsers. The HTML files will stored in the Web Server. Site statistics will be computed to supply data such as number of users, demand of computational resources (hardware and software), type of use (courses, simulation, general information), and other. Site statistics is essential to define strategies to maintain, commercialize and increment the services of the site. This feature will also manage the services provided by the Simulation and Training Centers. For that purpose, it will have to access information available in the Account Manager and Hardware Provider features. &RQILGHQWLDO DPM-FEM-UNICAMP, 2000 Page 8

9 6LPXODWLRQ&HQWHU The Simulation Center subsystem will provide software and services to apply computational simulation based on the FEM to engineering problems. Users will have to download or request a CD-ROM to install the software environments on their local machines. But the software environments will run just if the user is logged in FEAWEB. An authentication system will generate a password periodically to validate the use of the applications. Some services will be provided through forms to simplify their use. All graphical applications will be based on the ACIS library (see Based on the ASP concept, the Simulation Center is in fact the Application Provider part of FEAWEB. The following functionality will be available. $GDSWLYH)LQLWH(OHPHQW$QDO\VLV The FEM obtains an approximated solution for the problem under investigation. Of course, there is an error given by the difference between the theoretical and approximated solutions. In general, the error can not be calculated because the theoretical solution is not known. This fact is the reason to apply numerical methods. However, the error can be estimated using procedures called error estimators. From the error distribution given by the error estimator, a mesh refinement strategy and an admissible error, a new adapted mesh can be generated. It is expected that the error in the approximated solution of the adapted mesh is closer to the admissible error given by the user. FEAWEB will provide an adaptive analysis software environment for the problems considered.,qwhuidfhzlwk)lqlwh(ohphqw3dfndjhv This feature will make possible to read files generated from other finite element software. Specifically, Ansys and Nastran files will be read and converted to the standard format used by the software available in FEAWEB. This feature will increase the interoperability and potential use of the site. For example, large Ansys and Nastran files may be read and processed by the hardware available in FEAWEB. )LQLWH(OHPHQW0HVK*HQHUDWLRQ Automatic mesh generation has been the most difficulty practical task for the application of numerical methods to engineering problems. Mesh generation is not a simple theoretical and practical problem for complex 3D geometry. Another drawback is the miss integration of CAD and mesh generation software (see the Geometry Generation section). FEAWEB will provide resources for the automatic generation of finite element meshes. This functionality will be provided trough a form or by using a software environment. Initially, the GID package (see and proprietary FEAWEB software (see will be used to support this functionality. *HRPHWU\*HQHUDWLRQ As presented previously, the first step to apply the FEM to engineering problems requires the geometry of the mechanical component. The best option to generate that geometry is to use CAD systems because. But the finite element packages have also implemented drawing capabilities. FEAWEB intends to offer services to import CAD files and a software environment for the drawing of simple two and three-dimensional domains. One of the main problems for the effective integration between CAD (Computer Aided Design) and CAE (Computer Aided Engineering) software is the way CAD and CAE systems work. In general, CAD packages are based on physical analogies to draw mechanical components. For example, when a chamfer is drawn, the CAD systems work in the same way a chamfer is made on a surface by a worker using an appropriate tool. This makes difficulty to characterize the intersections between surfaces of a drawing. In general, CAD professionals are not worried about intersections between surfaces of a drawing. But the intersections are very important for mesh generation in CAE system. &RQILGHQWLDO DPM-FEM-UNICAMP, 2000 Page 9

10 Many times when importing a CAD file to a CAE system, lines and surfaces are duplicated which make difficulty or impossible the automatic generation of finite element meshes. One way to overcome this difficulty is to apply healing procedures to CAD files before using them in CAE systems. Another difficulty is the existence of several CAD file formats to exchange data (e.g., IGES, DXF, STEP, SAT, other) and many different implementations of these formats by each CAD development company. Using the ACIS library standard format SAT developed by Spatial Technologies Inc. ( services for healing and reading/writing of CAD files (IGES, STEP, Catia and Pro-Engineer formats) will be provided. For that purpose, specific ACIS library resources (additional library subsets called husks ) will be used to develop applications to support those tasks. Another possibility is to use the healing and conversion services of the site But FEAWEB will provide also a software environment for the drawing of simple two and threedimensional domains. In addition, this environment will use import CAD files and correct them automatically using the ACIS library husks. If it is necessary, the user will be able to fix the file interactively using drawing tools such as fillet, trim and Boolean procedures. This environment will be developed using the ACIS library framework. Running the software will require users to be connected to the site because an authentication system will generate a password periodically. 6LPXODWLRQRI3UREOHPV Given a geometric description and a finite element mesh, it is possible to define parameters specific to the problem under investigation. FEAWEB will provide a software environment to the definition of problem dependent parameters. This environment will make possible to define interactively the analysis type, boundary conditions, loading, material properties and other specific parameters for the considered problem. Accordingly to the selected analysis type, specific interface options suitable for the problem under consideration will be activated such as boundary conditions, loading and material properties. The graphical framework will be implemented on the ACIS library. Once all parameters are defined, a file is generated for local or remote processing by a solver module specified by the user. The analysis types provided will be those available in the FEAWEB solvers (e.g., stress analysis, freevibration, field problems, linear and nonlinear hyper-elasticity, contact, plasticity and fatigue). For other analysis types not available in FEAWEB, there will be access to other packages such as Ansys and Nastran.. 2SWLPL]DWLRQRI0HFKDQLFDO&RPSRQHQWV Engineers always want to optimize the designs of products. FEAWEB will provide a software environment for the structural optimization of mechanical components. Initially, this environment will perform distributed parameter, shape and topology structural optimization of linear problems. Given a file with the geometry of the component, users will define optimization parameters (e.g., design variables, structural performance functionals, solver and convergence parameters for the minimization algorithms). This data is the minimum setting required to perform a structural optimization. Standard settings and advanced options (e.g., strategies for mesh updating during design updates) will be available. Gradually, structural optimization of nonlinear systems will be added to this software environment. The graphical framework will be implemented based on the ACIS library. &RQILGHQWLDO DPM-FEM-UNICAMP, 2000 Page 10

11 9LVXDOL]DWLRQRI5HVXOWV Perhaps the most important step in a Finite Element Analysis is the interpretation of results. For that purpose, graphical and numerical checking of results is essential. FEAWEB will provide a software environment for the visualization of results. This environment will provide graphical and numerical visualization of analysis results obtained from FEAWEB solvers. The input can be a binary or ASCII file with the mesh parameters and analysis results. Graphical procedures such as isolines plots and animation will be provided. The graphical framework will be implemented based on the ACIS library. 7UDLQLQJ&HQWHU The Training Center subsystem will offer distance learning courses and tutorials on many topics related to numerical simulation. 0RQWKO\$UWLFOH Specialists from academy and industry will be invited to write a monthly article about topics related to computational simulation of engineering problems. 'LVFXVVLRQ/LVW Users will have the option to enter in discussion lists about topics in computational simulation of engineering problems. The participation will be optional and the user may take part or abandon the list anytime. 4XHVWLRQ%R[ Users will submit questions to the site team, discussion lists and consultants. Initially, this service will be free of charge. If the demand increases, the service will be charged. 3UREOHP%R[ Users will be able to leave a brief description of engineering problems whose solution needs site support. The site can solve the problem using its own team or registered consultants. 2QOLQH&RXUVHV A key requirement for a reliable application of computational simulation to engineering problems is user training. In the present case, training is related to the learning of basic mechanical concepts, numerical methods and software for the use of the analysis tools. Some specific distance courses will be provided in which the software environments described above will be used. 8VDELOLW\ 6LPSOHDQG6SHFLILF&RPSXWDWLRQDO0RGXOHV The main objective is to develop software environments with simple and intuitive user interfaces. In addition, there should be low demand for disk and memory resources. To accomplish those objectives, specific analysis environments will be developed accordingly to each class of problem to be addressed and standard software components will be used.,qwhuqhw All resources provided on the site will be accessible from the Internet. For analysis environments that require intensive data processing (e.g., solvers), it will be possible to choose between local or remote running. Some environments (e.g., geometry and visualization environments) will be used only locally. However, all the services will be available from the Internet. Online validation of passwords will be always required. Models processed remotely will be kept private. &RQILGHQWLDO DPM-FEM-UNICAMP, 2000 Page 11

12 ,QWUDQHW For companies for which privacy aspects are critic, it will be possible to install a version of the site in a local Intranet. In this case, the company will provide network infrastructure and be responsible by all security aspects. 5HOLDELOLW\ 6DIHW\DQG3ULYDF\ Security of all data provided and received by the site, in addition to privacy of all data received from the users, are crucial aspects. This feature will require the use of proper technologies for information security and control. 3HUIRUPDQFH 6KRUW5HVSRQVH7LPH The exchange of any information between site and users should take a suitable time interval for each activity requested by the user. This feature may require advanced network technology. 6XSSRUWDELOLW\ :LQGRZVDQG/LQX[&RPSDWLELOLW\ The services will be available from Linux and Windows. The homepages will be developed using HTML standards. The software environments provided for training and simulation will be Windows and Linux compatible. %XVLQHVV5XOHVDQG5HJXODWLRQV,QWHUSUHWDWLRQRI5HVXOWV A brief description of the reference. Notes on what decision has been made on it and how the reference will be considered. 7HFKQRORJ\5XOHVDQG/LPLWDWLRQV 0RGXODU(QYLURQPHQWV All programs will be developed modularly aiming to obtain software components suitable for many applications. In some cases, standard components libraries (e.g., ACIS library) will be employed. &RQILGHQWLDO DPM-FEM-UNICAMP, 2000 Page 12

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