Konferenzbeiträge ab 2018

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Glaser, Marcus; Matthes, Sebastian; Riegler, Sascha Sebastian; Hildebrand, Jörg; Bergmann, Jean Pierre; Schaaf, Peter; Gallino, Isabella
Characterization of plastic-metal hybrid composites joined by means of reactive Al/Ni multilayers - evaluation of occurring thermal regime. - In: Engineering for a changing world, (2023), 4.3.056, S. 1-16

Present challenges in material science and joining technology are ever more subject to the desire for lightweight construction and engineering. Plastic-metal composites are suitable material combinations but also require the development and investigation of appropriate joining technologies. A particularly promising approach is the application of reactive multilayer foils. As an innovative method, these foils provide the possibility of flexible and low-distortion joining of dissimilar materials. The underlying reaction mechanism offers fast exothermic reaction propagation with well-known exothermic power output while the energy source is introduced directly into the joining zone. In this work, hybrid lap joints between semi-crystalline polyamide 6 and structured austenitic stainless steel X5CrNi18-10 were joined using reactive Al/Ni multilayer foils. The self-propagating reaction provides immediate temperatures that are well above the melting point of used plastic but decays rapidly after only a few milliseconds. To support ongoing investigations regarding composite formation, analysis of occurring thermal regime is in the focus of this work. Conducted experiments are supported by accompanying thermal simulation in ANSYS Workbench. Besides the estimation regarding sensitivity of thermal material parameters the evaluation of formed melting zone and resulting thermally influenced area is a central topic.



https://doi.org/10.22032/dbt.58913
Brix, Torsten; Bücker, Silvie; Husung, Stephan
Sustainability strategies and their influence on the product development of machine tools and special machines. - In: Engineering for a changing world, (2023), 4.2.125, S. 1-19

In the context of product development, the goal of developers is to design products based on a variety of stakeholder needs so that they sufficiently satisfy a wide range of required characteristics. The required properties relate to function, safety, manufacturability, cost, usability, etc. In recent years, sustainability has gained importance as an additional and now indispensable guiding principle in product development due to the rapidly growing global environmental, social and economic challenges. The focus of this paper is on sustainability, which takes into account resource consumption, environmental protection and ecology. The same applies to the circular economy as an essential component of sustainability strategies when it comes to product or material cycles, as well as the targeted repair, reuse, modification, waste prevention and upgrading of products, etc. A product category that is rarely in the public eye is machine tools and special machines. In order to consistently consider sustainability and the associated circular economy in the development of these machines, product developers need practice-oriented and methodically validated decision-making means. The paper discusses and systematizes possible sustainability strategies and their implications from different perspectives, such as business models or applicability.



https://doi.org/10.22032/dbt.58896
Mandel, Constantin; Schwarz, Stefan; Brix, Torsten; Albers, Albert; Husung, Stephan
Improving system of objectives maturity through systematic reuse of knowledge using ontology-based knowledge representations. - In: Engineering for a changing world, (2023), 4.2.087, S. 1-16

Technical products are developed to meet the needs of different stakeholders. In addition, various constraints from all phases of the product life cycle have to be considered. In existing work, this information and its dependencies are systematically represented in the so-called system of objectives. A major challenge in modeling the system of objectives is that the necessary information in the system of objectives is often incomplete and uncertain. In addition, this uncertainty and the maturity of the system of objectives cannot be directly quantified because the target state of the system of objectives often cannot be unambiguously described. This research investigates a methodical approach to assess and improve the maturity of the system of objectives. Two means to reduce uncertainty and thus increase the maturity of the system of objectives are the systematic reuse of knowledge and the systematic building of knowledge through verification and validation activities.



https://doi.org/10.22032/dbt.58908
Salazar Márquez, Marcio B.; Gabash, Aouss; Shardt, Yuri A. W.; Tafur Sotelo, Julio C.
Optimal design of a photovaltaic station using Markov and energy price modelling. - In: Engineering for a changing world, (2023), 4.2.083, S. 1-14

This paper addresses the optimization of photovoltaic (PV) systems to increase their efficiency. The study introduces a new pricing model that considers the current price of PV inverters. In addition, Markov modeling is used in a new optimization framework to determine the optimal configuration, considering the number of PV modules and inverters, operational constraints, and failure events of PV inverters up to 100 kW. A case study with six real PV inverters confirms the effectiveness of the proposed framework. It calculates the average daily hours of rated power generation considering geographic location, temperature, and solar irradiance using real data from a real PV system. The study identifies both local and global optimal solutions for PV inverters (15 kW to 100 kW), while minimizing the effective levelized cost of energy. The results of the study have important implications for future assessments of PV module failures and repairs.



https://doi.org/10.22032/dbt.58910
Watty, Robert; Brix, Torsten; Hirte, Uwe; Husung, Stephan
Building agile product design competences in student projects. - In: Engineering for a changing world, (2023), 4.2.066, S. 1-11

The increasing complexity of technical solutions caused by constantly changing requirements and competitive situations, has led to the introduction of agile development processes in various domains in order to be able to react faster and more efficient to changes. This paper explores the integration of agile aspects into engineering education to prepare students for the corporate world. Two approaches, a single-stage and a two-stage approach, were implemented and evaluated in student projects at Technische Hochschule Ulm and Technische Universität Ilmenau. The findings reveal that both approaches effectively enhance students' competencies in agile product development. The observations highlight the value of iterative sprints, design thinking, peer learning, focused work, stakeholder involvement and the application of digital tools. Students exhibited increased confidence, independence, and creativity in their development projects. The integration of agile approaches in teaching methodologies proves beneficial in addressing the challenges posed by complex technical solutions and evolving requirements.



https://doi.org/10.22032/dbt.58911
Steck, Marco; Husung, Stephan; Schmid, Christoph
Methodical procedure for a surrogate model based fatigue calculation to support the design process of eBike drive units. - In: Engineering for a changing world, (2023), 4.2.053, S. 1-19

In this paper, a method is developed to consider multiaxial load spectra and their variation in a computationally efficient local fatigue calculation procedure. This method is based on an FE data-based surrogate model and is intended to support the simulation-based product design process. To demonstrate their application and necessity, a case study on the design of eBike drive units is presented. For this purpose, the general requirements for the design of eBike drive units as well as the fundamentals of multiaxial fatigue analysis and surrogate modeling are outlined. In addition, a validation process of the surrogate model and its use for fatigue calculation is presented and discussed.



https://doi.org/10.22032/dbt.58909
Grosse, Karl W.; Hirte, Uwe; Brix, Torsten; Einicke, Frank; Hoffmann, Frank; Husung, Stephan; Flüggen, Folker
Hybrid teaching and learning environment in the context of virtual product development. - In: Engineering for a changing world, (2023), 4.2.052, S. 1-8

Product development means identifying the needs of different stakeholders, developing a product for them to the point where it is ready for production and use, and documenting it. To manage the complexity of product development, it is becoming increasingly digitalised. As virtual product development is a key area of industry, teaching in this area is an important component of a practice-oriented engineering curriculum. Engineering education constantly requires new teaching and learning formats. The trend is towards a systematic combination of digital teaching materials for self-organised individual and cooperative self-study on the one hand, and in-depth forms of classroom teaching tailored to the needs of students on the other - in short: hybrid forms of teaching and learning. Within the framework of an eTeach impulse project for a hybrid teaching and learning environment for virtual product development, important results have been developed, implemented and evaluated to achieve this goal.



https://doi.org/10.22032/dbt.58902
Panusch, Felix; Brix, Torsten; Rienecker, Maik; Husung, Stephan
Systematization of existing uncertainties in the context of product development in the automotive supply industry. - In: Engineering for a changing world, (2023), 4.2.044, S. 1-18

Along the development process of technical products, challenges arise repeatedly, which result from uncertainties, i.e., conscious, or unconscious gaps in knowledge or definitions. The causes often lie in the fact that empirical values represent the basis for many decisions, from the specification of tasks to the required organizational and control structures to the models and calculation tools used. Based on this knowledge, it is essential to continuously identify, evaluate and, if necessary, reduce the degree of uncertainty during the development of innovative products. This is intended to avoid potentially negative influences on the strategic goals of the magic triangle of project management (costs, time, and quality). This is exactly where the investigations started, using the example of an automotive supplier company. Completed projects are the starting point. A first focus is on the analysis of the effects of unclearly defined requirements and ambiguities in verification, validation, and end customer use. A second focus is the systematization, classification up to the provision of project-specific tools, which should facilitate the reduction of uncertainties already in early project phases.



https://doi.org/10.22032/dbt.59012
Faheem, Faizan; Li, Zirui; Husung, Stephan
Analysis of potential errors in technical products by combining knowledge graphs with MBSE approach. - In: Engineering for a changing world, (2023), 4.2.032, S. 1-15

Technical products are developed to meet the demands of stakeholders. Therefore, the product's functions and associated properties are important. Various influencing factors e.g., external disturbances can have an impact on the input flows of the products or its characteristics and thus on the functions. If this leads to deviations between the required and as-is functions, these deviations are called errors. It is therefore important to analyze errors in product development and implement measures to increase the robustness of the product. Model-Based Systems Engineering (MBSE) supports the development of complex systems. However, MBSE alone has limited ability to identify in-depth errors. This requires knowledge of possible errors from previous products in specific contexts. For this purpose, the method proposed in this paper facilitates identifying errors in the concept phase by combining MBSE approaches with reusable knowledge (i.e., knowledge graph). The approach is presented using an application example for a mobile robot.



https://doi.org/10.22032/dbt.58898
Li, Zirui; Faheem, Faizan; Husung, Stephan
Systematic use of model-based solution patterns using the example of a load cell. - In: Engineering for a changing world, (2023), 4.2.029, S. 1-17

Complex mechatronic products are usually decomposed into several sub-systems for their development. These sub-systems are developed in parallel or even independently based on their specifications and use cases. The application of model-based solution patterns is an effective way to comprehensively and efficiently describe the available knowledge about the sub-systems. This contribution proposes an approach to support the selection and application of model-based solution patterns. The approach, based on a metamodel for solution patterns using SysML, describes the process for selecting solution patterns and aligning requirements and constraints with the as-is properties of the sub-systems. Additionally, the approach supports the design of solution patterns taking into account special knowledge from the development of the sub-systems as well as the usage of the solution patterns in different systems and contexts. As an example, an application scenario of a specific load cell within a measurement system is explained.



https://doi.org/10.22032/dbt.58904