The main design activity in engineering practice is to adapt existing designs or to create variants of existing products to new demands, which require a robust model against both parametric and topological changes. To design such a kind of model becomes a big challenge, especially in the development of structural components due to the number of load application points, variable load cases and restrictions from manufacturing technologies. Thus, the generative parametric design approach is applied to generating high dynamic product models, allowing them to be adjusted for changes feasibly.
For an optimal preparation of mechanical engineering students for their future work life, the use of problem-based methods in design teaching is investigated. Therefore an intelligent tutoring system for computer aided design education will be developed, which can automatically evaluate computer aided design models of design students. A knowledge-based engineering system will be used to assistance the design students in the execution of design tasks. Using a practice-oriented example, the application and the advantages for teaching will be verified and discussed.
Today's CAD-systems offer the possibility to model geometry-based solution spaces based on parametrics and feature technology. Here, the solution space is the set of all feasible product alternatives from which a distinct variant for a defined set of requirements may be configured. A necessary step prior to modelling the solution space is to acquire knowledge about dependencies of requirements, solutions and restrictions that are dictated by the supply chain, e.g. manufacturing restrictions. In this article, the authors contribute to this field by developing the Parameter Space Matrix (ParSM) as a tool for a structured elicitation of requirements, solution space restrictions and the resulting model parameters for the CAD-model. Furthermore, the application of ParSM is shown and discussed on a toaster with variable body elements where the manufacturing restrictions result of an additive manufacturing process.
This article reflects a template-based design approach for modelling the design solution space of structural components. After discussing the theoretical background for knowledge-based design (KBD) and the classification of design templates in the field of KBD, the usefulness of templates in design of structural components is argued. In order to setup the design solution space as large as possible and not to automate a single design, we follow the assumption that assembly structure and model structure have to be considered independently. This is mirrored in a case study where beam elements are aggregated to different frame structures.
Knowledge-based engineering (KBE) systems allow an easy adaption of designed artefacts to new functional or design requirements and automating routine design tasks. In the following article the author wants to focus on the three main concepts of linking CAD and KBE and answer the research questions (1) in which way is integration, embedding and coupling of KBE to a standard CAD system like Autodesk Inventor available and (2) how can the single approaches be compared in terms of modelling effort, user competences and system performance.
The deep-drawability of a sheet metal blank is strongly influenced by the tribological conditions prevailing in a deep-drawing process. Therefore, new methods to influence the tribology represent an important research topic. In this work, the application of a process-integrated lubrication in a deep-drawing process is investigated. Most promising geometries of the lubrication channels and outlet openings are first identified by means of numerical simulation at the example of a demonstrator process. Cylindrical test specimens with the specified channel geometries are additively manufactured and installed in a strip drawing test stand. Additive manufacturing enables the possibility of manufacturing complex channel geometries which cannot be manufactured by conventional methods. A hydraulic metering device for conveying lubricant is connected to the cylindrical test specimens. Thus, hydraulically lubricated strip drawing tests are performed. The tests are evaluated according to the force curves and the fluid mechanical buildup of pressure cushion. The performance of process-integrated lubrication is thus analyzed and evaluated. By means of a coupled forming and SPH simulation, the lubrication channels could be optimally designed. From the practical tests, it could be achieved that the drawing force decreases up to 27% with pressure cushion build up. In this research, a hydraulic lubrication in the area of highest contact normal stresses is the most optimal process parameter regarding friction reduction.
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