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26. April 2017

Christian Reintjes presents his research at Operations Research in Engineering

In March 2017, Christian Reintjes, scholar of the SME Graduate School, presented his research results on the topic „Beam structure Optimization for Additive Manufacturing“ as part of the workshop Operations Research in Engineering.


The reserach team headed by professor Dr. Ulf Lorenz (University of Siegen, institute of technology management) organised the workshop in conjunction with the Technical University of Darmstadt (special research project 805), the university of Duisburg-Essen and the department for the cooperation with medium-sized companies („Siegener Mittelstandsinstitut“).

It is the aim of technical Operations Research to establish quantitative methods for the synthesis of technical systems in engineering sciences. Mathematical optimization is well known in economics under the name of Operations Research. Technical Operations Reserach (TOR) covers much more than using mathematical modeling and solution algorithms in order to optimize technical systems. Another important subject is the evaluation of new technologies. Therefore, technology management is playing a major role in TOR. As an interdisciplinary science, TOR bridges the gap between mechanical engineering, computer science, mathematics and business studies. As a interface between science and industry, it is the aim of the workshop to build an interdisciplinary research netowrk.

The current progress in construction industry indicates that there is a huge interest to use generative design, or in general, optimization models, for developing products with highly complex geometries. It is the desire to use computational forces in form of optimization programs and to combine them with the design experience of engineers. Using both, it is possible to generate construction proposals beyond human abilities. The problem is that the conventional manufacturing techniques, like milling, turning or casting, are just not able to produce such complex structures. Arriving at this point additive manufacturing becomes important because it enables us to manufacture these extremely complex structures including undercuts or hollow spaces, provided by the optimization program.

For this reason Christian Reintjes developed and presented a linear optimization model to describe static load cases in relation to framework strucutres. By using a graph network it will be possible to reproduce the assembly space of an additive manufacturing system. The model describes any number of transmitted forces into the framework structure which are working against the forces being exerted by the assumed bearings. The model determines independently where and which capacities are needed at a particular position within the assembly space, whereas it can choose from a given quantitiy of connecting elements (e.g truss girders). The aim of the beam structure optimization for additive manufacturing is to reduce material and improve the field of lightweight construction, with the aim of saving costs overall.


Christian Reintjes B.Sc.
Universität Siegen SME Graduate School – Fast-Track PhD
E-Mail: christian.reintjes@student.uni-siegen.de