Papers by Keyword: Computer Aided Engineering

Abstract: It’s difficult to perform underwater positioning for submarine immersed tube tunnel construction in deep water and torrent condition due to the complex underwater environment and absence of traditional survey method, we developed a 3D computer aided construction application with assistance of advanced measurement equipment. A laser aiming equipment is also utilized to acquire the subtle offset caused by the current flow. This paper described design and development of the data communication, core calculation model,display model and auxiliary tool model in detail, and also shows how they are utilized during the submarine immersed tube tunnel construction.

Abstract: One of the possibilities how to increase the efficiency of the deployment of tools for design, simulation and preparing of manufacturing technology is linking engineering applications with external tools, providing data for digital model managing. Strategically correctly designed parametric model can be managed by externally provided information. This paper provides examples of three methods using external data. Presented methods are validated during the use in industrial practice and in the preparation of technical staff at secondary schools, colleges and universities of engineering focus. The main objective of the deployment of presented methods is the acceleration of creation of virtual prototypes digital data of varying complexity while maintaining the accuracy of the corresponding geometric and functional requirements for the final product. At the same time these methods can be used to streamline transfers between different data formats of designer data and to allow interventions into the structure of the model without the use of a particular design engineering applications.

Abstract: Modular bridge structures are commonly used in areas where space and weight are major limitations. In this study, a modular bridge structure made of extruded aluminum alloy AA7005 was analyzed using numerical simulations. Parametric model of the bridge structure was produced and optimized for required loading conditions. The aim of the research work was to minimize the weight of the bridge structure without compromising its strength. Sensitivity analysis was performed by taking thickness of the structure member as optimization variable. Optimum thickness of the bridge member obtained from simulations was assigned for the analysis of the entire structure. Results obtained from Finite Element (FE) simulations predicted maximum stress at the center of the structure. Parametric modeling of the structure allowed to asses failure against different loading conditions.

Abstract: In the past, plastic injection molding (PIM) product quality was usually measured by one single quality characteristic or by multiple quality characteristic with independent parameters one another. In this study, optimization of process parameters using design of experiment (DOE), response surface methodology (RSM), and genetic algorithm (GA) were proposed to generate the optimal process parameters settings of multiple-quality characteristics. In the first stage, significant PIM process parameters can be determined by DOE screening experiments. Then the optimal process parameter settings are obtained via computer aided engineering (CAE) simulation integrated with RSM and GA, which are taken as practically initial settings of process-related parameters. The experimental results show that the propose optimization model is very successful and can be used in industrial applications.

Abstract: This article proposes the development of a simple, flexible and portable system that will allow carrying out management, maintenance and inventory tasks in electrical substations. The Spatial Information System (SIS) permits to incorporate, through an immersive virtual environment, information about electrical substations, as well as progress in automation CAD/CAE design (Computer Aided Design/Engineering). The SIS provides an immediate knowledge of the substation spatial distribution through an interactive navigation, facilitating any type of technical question as consulting planes (sections, elevations, plants), database (files, queries) and the dimensional analysis of any object. To this end, the SIS developed can be applied to the management and complete control of a substation at the same time as a platform that encourages collaborative engineering or CAE engineering.

Abstract: Research on product lifecycle oriented knowledge manage of manufacturing enterprises is still a new topic. Aimed at the improvement on the decision ability of enterprises on knowledge and product innovation, a product lifecycle oriented knowledge resource allocation service framework was proposed, and the innovation management based on knowledge resource was views as a necessary business for product manufacturing. The complex network theory was adopted for the decision of knowledge resource allocation, and a knowledge module based resource allocation method was discussed in the paper which results in the decrease in complexity and uncertainty of knowledge management and decision. The architecture of system architecture and key technologies were addressed in the paper.

Abstract: The valve design of a rear twin tube shock absorber belongs to a light commercial vehicle whose damper characteristics already known has been realized by the help of a computer program called “Dr”, and compared with the actual application results. The program gives user results about the valve parts to get the right target characteristics. After obtaining the necessary parts’ results, the needed damping performance test has been performed by the shock absorber, which has been conflated according to the program. The actual results and target characteristics were compared. ”Dr” program enables the user to select the correct parts to be used in valve system by detecting every effect on target characteristics diagram. By comparing the overall effect of the parts selected, shock absorber valve system is conflated according to the valve components obtained from the computer program.

Abstract: In recent years the simulation of manufacturing chains and of the crash behaviour of automotive sheet metal structures has gained more ground on its way to be established in accompanying the overall product cycle. In the automotive press and welding plants high accuracy and quality of sheet metal structures is essential in order to achieve the intended passive crashworthiness of the overall vehicle body. So as to describe the manufacturing process chain more precisely and to predict the structural behaviour at early stages of product and production planning, an interlinking of forming, welding and crash models within a structural computation chain is necessary. Considering the structural properties of sheet metal parts after the forming process for simulating welding tasks and finally the crash behaviour requires a multifaceted modelling method. In this paper a practicable strategy of realising the simulation chain forming-welding-crash of sheet metal structures is introduced by means of shell element models. The complete computed results of a forming process simulation, such as residual stresses, plastic strains and material thinning are transferred onto a prepared shell mesh based on the CAD geometry of the component, which satisfies the requirements of a welding computation. Further on, the structural properties after forming, the thermal distribution due to the welding process and the mechanical clamping conditions are combined in a thermo-mechanical computation of the welding effects to calculate the final shape, residual stresses and material thinning of the manufactured sheet metal structure. Finally, the attained structural results are converted into the required data-format by means of a developed conversion routine, which enables the setup of a crash model considering the entire preliminary manufacturing chain. In this contribution the structural behaviour along the introduced simulation chain is analysed step by step and the rendered results are discussed and compared with performed measurements.

Abstract: We have developed a technique for estimating vibrations of an automotive body structures with viscoelastic damping materials using large-scale finite element (FE) model, which will enable us to grasp and to reduce high-frequency road noise（200～500Hz）. In the new technique, first order solutions for modal loss factors are derived applying asymptotic method. This method saves calculation time to estimate modal damping as a practical tool in the design stages of the body structures. Frequency responses were calculated using this technique and the results almost agreed with the test results. This technique can show the effect of the viscoelastic damping materials on the automotive body panels, and it enables the more efficient layout of the viscoelastic damping materials. Further, we clarified damping properties of the automotive body structures under coupled vibration between frames and panels with the viscoelastic damping materials.

Abstract: In this paper the Finite Element Method (FEM) is applied to verify the reliability of the steel ladle turret while the steel ladle capacity was extended. The three-dimensional model of the ladle turret parts were constructed with the 3D digital modeling technology. The models of main subassembly that need to be checked were digitally assembled imitatively. The key forcing parts were FEM Meshed and analyzed the stress and the displacement. The verify check results show that the coefficient of safety of the equipment is large enough for the ladle capacity raised from 300t to 320t without changing the structure of ladle turret. It can meet the strength requirement after the ladle capacity was extended. The digital assembled model of the equipment can also be used for further digital mechanism analysis.