CAE Systems Research Articles

MODELLING AND NUMERICAL ANALYSIS OF THE REINFORCED CONCRETE VIADUCT UNDER THE EUROCITY EC-114 TRAIN

The paper presents a methodology of finite element modelling and numerical simulation of symmetric vibrations of the reinforced concrete viaduct using advanced CAE systems. Two types of analysis were carried out – static analysis of the viaduct under dead load and dynamic analysis under a moving high speed train. The KNI 140070 viaduct of span length of 14.40 m with abutment zones was selected as a representative for the study. The serviced ballasted track was taken into consideration. The FE model of the track includes the main rails, fastening systems, sleepers and the ballast. The EuroCity EC 114, Polish high speed train, moving at 100–160 km/h was selected for the study. Components of the train FE model were considered as rigid bodies and were modelled using shell and beam elements. Cylindrical and revolute constrained joints were applied for kinematic connections and relations between relative components. Discrete springs and dampers were applied for modelling of the primary and the secondary suspension systems. The numerical analysis was performed using finite element code LS-DYNA. The stress distribution in selected components of the viaduct structure was presented as the results of the static analysis, whereas the selected time histories for displacements and stresses were shown as the results of the dynamic analysis. The results obtained from both analyses allowed to assess the actual displacement and stress states for the considered viaduct.

Development techniques of casting complex parts of aerospace profiles using additive technologies

The use of rapid prototyping technologies to create new industrial products, with particular importance isthe cost and speed of production, is a unique opportunity to use cost-effective methods for the production ofparts by investment casting. At the stage of pilot production, which is characterized by frequent changes indesign, the problem of the rapid production of cast components becomes crucial. This is mainly due to thecomplexity and the complexity of manufacturing foundry equipment. In turn, the research and development ofrapid prototyping technologies have allowed a new level of optimization and the introduction of newtechnologies in the investment casting. The aim of this work is to identify opportunities and evaluate accuracy ofthe size of the casting during investment casting using rapid prototyping technology. The work was conductedwith the use of cross-cutting design in CAM / CAD / CAE systems. The study size and precision parameters ofthe casting was conducted in co-ordinate measuring machine. The work has been verified the adequacy of thevirtual simulation of the process of forming a casting in the casting simulation ProCAST, in comparison withthose obtained castings. The study showed that the use of rapid prototyping technologies with investment castingcan significantly reduce the time for making castings, reduce production costs and improve the accuracy of thesize of the casting.

Optimization of the Lean Production Process Using the Virtual Manufacturing Cell

The most important element of the production process is the optimization of the conducted operations. It is particularly important for the lean production process. In the paper is presented the analysis of the optimization approach using the CAE systems, the multi-agents systems (MAS) and the distributed robotics (DR) systems. Using the CAE techniques it is possible to elaborate the virtual environment in which the manufacturing cell is designed. The interaction between the virtual model and the process rule base allow improving the design of the existing standard machining technology. The MAS approach let to create the structure of the manufacturing process, taking into account both the machining stands and transport units according to the elaborate technological process. Finally the utilization of the DR approach for the optimization of transport operations including the heuristic algorithms. Moreover in the paper are presented the results of the investigations of analyzed problem on the base of complex production line for the cylindrical elements. The simulations and other analysis have been conducted in advanced computer systems. Also the basic relation between mentioned systems are discussed.

The development of an experimental CAE system (a simulation system for analysing vehicle performance)

Various simulation programs are used in analysing vehicle performance. In some cases, experimental databased simulation programs are more effective in terms of practicality or calculation accuracy. Models for analysing vehicle performance (driving performance, noise, vibration, etc.) have been developed and systemised by unifying experimental data acquisition systems and simulation systems. Furthermore, a database containing simulation inputs has been constructed. This system embodies the advanced concepts of CAE systems advocated in recent years. Application of this system should enable effective performance analyses to be carried out in every area.

Modeling and Virtual Simulation of Hard Surface Milling and Forming Process Using Advanced CAE Systems

This paper presents the influence of modeling and simulation techniques for hard milling and forming. The aim of these simulations is the ability to optimize the manufacturing technologies even before the real production of its own tools, because their manufacturing process is very difficult in terms of production time, materials and other costs. The simulated results visualize roughing and finishing process of milling and generate tool-paths in CATIA V5. Simulation results of forming realized in PAM-Stamp 2G using a 3D model of the punch and the blank confirm the suitability of the proposed design of the forming tool. Finally, hard milling and forming simulations in CAE systems CATIA V5 and PAM-Stamp 2G were performed in order to determine and evaluation of suitability of the proposed shapes of the forming tool.

Special Issue on CAD, CAM, and Digital Engineering

Advanced products demand advanced CAD, CAM, and digital engineering systems. This is the main consideration in this special issue. It is well understood by all manufacturers nowadays that CAD, CAM, and digital engineering systems behave as “Hidden factories” of engineering information processing and are indispensable to the accomplishment of their daily tasks. No products can be planned, designed, machined, and assembled without these hidden factories. The history of CAD/CAM goes back nearly five decades, yet the technologies are still immature: a lot of technical issues remain to be solved because new materials and structures have been introduced in products, new manufacturing technologies have been utilized, and new social needs, such as the need for ”eco-X” or ”human-oriented” products, have grown along with the dramatic changes in society. New high-performance computing resources, such asWeb-based computing or GPUcomputing, have also become available for implementation in these systems. Thirteen technical papers in this issue tackle these challenges, proposing solutions from utilizing technologies, including computer-aided geometric design (CAGD), CAD, CAE, CAPP, and CAM, as well as novel human interfaces for these systems. Some of the papers, revised and extended in response to the editors’ invitations, are versions of works presented at the Asian Conference on Design and Digital Engineering 2012 (Niseko, Japan) and 2013 (Seoul, Korea). In addition, two well-organized review papers in this issue provide informative and comprehensive surveys of aesthetic curve and surface design in CAGD and knowledge structuring and logic reasoning in CAPP, respectively. They include rich lists of references which will help the readers to quickly gain an overview of the current status and future research directions of these fields. Finally, the editors sincerely thank all the authors and anonymous reviewers for their devoted work, as they made this special issue possible. We expect that it will encourage further research on advanced CAD, CAM, CAE, CAPP, and digital engineering systems.

The Investigation of the Stress State near the Crack Tip of Central Cracks through Numerical Analysis

The paper deals with the fracture problematics which is solved by CAE systems. Main goal of the numerical simulation is to investigate the stress state near the crack tip through determination of stress intensity factors. The investigated component is thick plate with symmetric central crack. Through determination of stress intensity factor for all three fracture modes of cracks can be told whether the crack will be grown by comparison of their values with critical value of the stress intensity factor for used material called as the plane strain fracture toughnessKIC. Numerical simulations were realized by the worldwide used code ANSYS. Through numerical simulation can be solved diverse fracture problems with various shapes of cracks and subsequently we can produce safer and more reliable products.

CAD/CAE Integration System of the Excavator Boom

According to the existing problems in the design of the excavator working devices boom, the method of integrated design and analysis for the boom was put forward by CAD/CAE integration technology. Firstly, design ideas of database in CAD/CAE integration system was given, so the data of model can be transmitted and exchanged effectively between CAD and CAE systems. Secondly, the parametric model of the boom was established based on parametric method. Thirdly, the customization analysis platform of the boom is built with customization technology and secondary development of ANSYS Workbench code. Finally, the parametric design and automatic finite element analysis for the excavator boom were implemented.

SPAN LENGTH INFLUENCE ON DYNAMIC RESPONSE OF SELECTED BRIDGE UNDER HIGH-SPEED TRAIN

The paper presents a methodology of finite element (FE) modelling and simulation of the bridge – track – moving high-speed train system using CAE systems. Two composite (reinforce-concrete – steel) bridges were considered. The span length was equal to 15 and 21 meters, respectively. Bridges selected for the study belong to the proposed series of bridges with the span length of 15 to 27 meters stepped by 3 meters. Full symmetry of the bridges was assumed. RC platform was homogenized since the rebars were distributed quasi-uniformly in the specified platform sections. The FE model of a bridge superstructure consisted of 4-node shell elements (main beams) and 8-node 48 DOF solid elements (reinforced concrete platform). RAIL_TRACK and RAIL_TRAIN LS-DYNA’s modules were applied for simulating the moving train – track interaction. Ballasted track with the rectilinear rail-line axis was taken into consideration. German ICE-3 train running at velocity of 200–300 km/h was selected as a representative for the study. All mass components of the train FE model were treated as rigid bodies. Symmetric vibrations of the train units were assumed with respect to the main longitudinal vertical plane of symmetry of the system. Nodal displacement and longitudinal normal stress in shell elements were registered during the FE analysis. The results were depicted in the form of time histories for selected velocities. In addition, extreme values of vertical deflections and normal stress were compiled and presented a function of train velocity. It allowed to assess the dynamic response of the bridge depending on its span length. Contours of resultant displacement for the RC platform was also presented.

An Architecture for the CAD/CAE Information Integration System of Hydraulic Press

Nowadays, CAD/CAE system has been widely used in manufacturing industries. Since every CAD/CAE system is fixed in the different platforms and has its own individual information model and data structure, the transfer of design information from one system to another often causes incompatible and/or incomplete data. The ability to vertically and horizontally share data becomes an increasing concern for manufactures. This paper presents a framework, which is oriented to concurrent engineering, to support the integration of the information flow between CAD and CAE systems. A prototype system based on this framework is developed. Common methods for information integration and two kinds of distributed structures (Client/Server and Browser/Server) are also discussed in this paper

Supporting engineering decisions through contextual, model-oriented communication and knowledge-based engineering in simulation-driven product development: an automotive case study

Modern manufacturers rely increasingly on overlapping activities and frequent, bilateral exchange of preliminary information, adding to the complexity of information exchange and general reuse. The approach presented in this paper relies on a reuse process, embedded in the design environment already used, to avoid disrupting the design process and to increase the foundation upon which decisions are made. The proposed approach relies on knowledge-based extensions to commercial CAE systems and 3D CAE models to enable and ensure simulation-driven design capabilities and contextual communication within the early stages of product development. The approach has been shown to increase the simulation-driven capabilities in a business-to-business scenario, and in extension, increase the foundation upon which decisions are made and the likelihood of reaching a feasible and optimal final design. In conclusion, a simulation-driven design approach to product development has to be more than enabled to truly make a difference in the development process. Investigation and evaluations show that supporting tools and relevant information must be made readily available, intuitive, integrated into the environment where they are needed and, ultimately, be perceived as a natural part of daily development in order for them to be accepted and used.

Research on CAD/CAE Information Integrated System Based on Web Services

The information integrated plan based on Web services was proposed, in view of the informations in current CAD, CAE systems are heterogeneous, distributed and diversity. Combined with the CAD/CAE information integrated system to expound the realization process of Web Services. On the basis of overall analysis of the CAD/CAE information integrated system, provided the framework of information integrated system with PDM functions as the core, which based on Web services technology. The development of CAD/CAE information integrated system based on Web services offerrs a possibility for remote collaboration in a distributed enviorment.

On STL Subdivision Algorithm of Parametric Cross Wedge Die

Aiming at solving the problem of the complicated structure and difficult 3D modeling of cross wedge rollors, the article does some research on the 3D cross wedge die based on STL documents. In accordiance with the data of parametric cross wedge die, adopting the STL document format, aotomatically construct the 3D shape of the model, this method can increase the efficiency of designing the modeling of cross wedge rollors; since most CAM, CAE systems can read STL document, this method can speed up the CAE and CAM systems in order to provide 3D geomatrical model quickly.

J045034 RC-D6「締結・接合・接着部のCAEモデリング・解析・評価システム構築研究分科会」報告

J045034 RC-D6「締結・接合・接着部のCAEモデリング・解析・評価システム構築研究分科会」報告

The Design and Implementation of a CAD/CAE Integrated System for Plastic Injection Molding

In the plastic injection molding process, interaction between design and analysis is very intensive. However, current computer-aided systems (CAD and CAE) are realized as isolated modules. Thus, designers need to transform data models between CAD and CAE systems. Defects of many data errors and duplicated work are inevitable. This paper presents a CAD/CAE integrated system, building on top of existing CAD and CAE systems. The framework of the system is designed. A parametric integration model is established to achieve bidirectional association between the two systems. Details of key technologies in pre- and post- processing are discussed, such as mesh generation, feature recognition, and automatic evaluation of analysis results. A practical engineering case is studied to illustrate that the system can effectively avoid mesh repair and remodeling in pre-processing, reduce the dependency on experience in analysis result evaluation, and greatly improve the efficiency of iterative design-analysis-optimization process.

Engineering collaboration framework with CAE analysis data

Current PLM systems handle a variety of engineering information including design model, analysis results, inspection data and so forth. However, most of the engineering collaboration tools today are based only on CAD models for design reviews and discussions. This makes it difficult to integrate CAE analysis results into a collaboration system since the analysis data size is usually too large and the data representation schemes vary among different CAE systems. In this paper, we propose a framework to represent geometry, mesh and analysis results which covers most of the typical CAE data in a unified manner. We implemented a prototype system to show the validity of the proposed approach. We also presented the collaborative visualization example of CAE analysis results for analysis reviews in injection molding domain.

Research and Design on Universal Framework for Integration CAD / CAE System

This paper, which studied the structure of CAD/ CAE system, has proposed a universal CAD / CAE integration framework. This system, with good compatibility and being convenient to be used, can be the basic platform for all CAD / CAE systems. This framework, with a unified structure of command processor, the message processing system, selection mechanism, can transform the development of CAD / CAE integrated system to that of functional command module. With the help of this framework, functional development no longer relies on framework. Therefore, the framework greatly enhances the efficiency of software system development.

102 オプションデザインパターンを用いたCAEシステムの実行性能(OS1-(1)オーガナイズドセッション《計算力学と数値シミュレーション》)

102 オプションデザインパターンを用いたCAEシステムの実行性能(OS1-(1)オーガナイズドセッション《計算力学と数値シミュレーション》)

Development of a Web-based MDO Framework for Design and Analysis Integration

The rapid progress of the Internet and network is affecting the engineering design environment as well as business that use Web technologies to enhance their competitive edge. In product development, experts and organization who take part in the design process are often geographically dispersed. Furthermore, different divisions and business often have heterogeneous CAD/CAE systems and methods for expressing product data, and addressing this heterogeneity creates additional costs and increases development time. Managing distributed CAD, CAE and other related systems in an organic and holistic manner from the initial stages of product development is imperative to ensure successful collaboration in the design process. Therefore, this study suggests a Web-based MDO framework to support interfacing and collective use of design and analysis tools.

Research and Implementation of 3D Surface Finite Element Mesh Generation Based on STEP

CAE analysis plays an important role in die and mould manufacturing. In order to improve the modeling ability of the existing CAE analysis system, the paper presents a STEP based method by improving the integration ability of CAE systems and CAD tools. And an improved strategy for mesh generation is described and the application system based on the strategy is implemented. Results show that the presented method helps to not only improve the mesh quality but also increase the process efficiency and reduce the time cost.