Publikationen 2018

Optimization of the mass ratio for a general multi-rotor aircraft

Matthias Friedrich, Walter Fichter 2018 AIAA Atmospheric Flight Mechanics Conference


This work presents a dimensionless approach for a performance analysis of a general electric multi-rotor aircraft with the aim of optimizing the mass ratio of the structure mass and the battery mass for achieving maximal flight time. A review of established approaches for performance analysis of flight vehicles operated by a rotor reveals, that the drivetrain is mostly disregarded in this kind of analysis. Furthermore, the equations of interest were only examined in their dimensionless form to some extend, in most cases this examination relates to the rotor only. Thus, it is impossible to give a general statement about the flight performance for a rotor driven aircraft. Based on these considerations, a dimensionless representation of the performance equations considering the whole aircraft were derived. Furthermore, an analytic solution for the mass ratio for maximal flight time is derived based on the dimensionless equations. This makes it possible to give a general statement about the design of the energy supply of the drivetrain for all electric rotor driven aircrafts.

Digital assembly planning using graph-based design languages

Jens Kiefer, Theresa Breckle, Ralf Stetter, Martin Manns 51st CIRP Conference on Manufacturing Systems


This paper illustrates a new engineering approach in the field of digital production planning using graph-based design languages. After introducing the overall process of graph-based production engineering, this contribution presents its most important characteristics. In a first step, the general concept of design languages is introduced; afterwards, its profitable application in the context of digital assembly planning is clarified. Apart from methodical issues, information-technical and organizational aspects are discussed. By means of a concrete use case – assembly planning of a self-balancing two-wheel scooter – both the procedure and extensive advantages of the new planning approach are demonstrated.

Modelling and Simulation of a Race-car Frame using Graph-based Design Languages

Manuel RamsaierRalf Stetter, Markus Till, Stephan Rudolph EngOpt 2018


Fabian Wünsch, Manuel Ramsaier, Theresa Breckle, Ralf Stetter, Markus Till Stephan Rudolph 15th International Design Conference


This paper deals with the integration of cost considerations into the technological design process of a product. As an example serves a self-balancing two-wheel scooter. The design process of that scooter is expanded with aspects from the cost-domain so that the design can be enhanced with economic knowledge. Methods of modern software engineering are applied onto classical engineering. For this purpose so called graph-based design languages are used. Through the representation as an UML-model, the realization of interfaces to antecedent and subsequent systems can be eased.