Project Duration: 01.04.2014 - 31.03.2017
Quantification of uncertainties analysis and evaluation of unconventional aircraft configurations
The design of unconventional aircraft configurations requires the application of a design environment that encompasses analysis tools based on physical models. DLR has developed such a design environment during previous projects and has applied it to various, mostly conventional aircraft configurations. As the uncertainties inherent to the design are unknown, it is not possible to quantify the level of confidence. Since the design of unconventional aircraft configurations lacks empiricism, it is difficult to estimate the quality of the design. The goal of the FrEACs project is to quantify the inherent uncertainties of the design environment and apply them to the design of two unconventional aircraft configurations. On the one hand, the project examines a strut-braced wing configuration as a short range aircraft with entry into service in the year 2035. On the other hand, a blended-wing body (BWB) configuration is considered as a long range aircraft with entry into service in the year 2035. In the course of the project, tools existing within DLR for the assessment of aircraft configurations in relation to costs, air-side capacity and noise are connected to the design environment and applied to the mentioned aircraft configurations.
The Department Safety Crticial Systems and Systems Engineering (SSY) is responsible for the design of the flight control system for the BWB configuration. The data format Premise, developed by the department, is used for the tool independent description for flight control systems. First, the data exchange between CPACS (Common Parametric Aircraft Configuration Schema) and Premise is made possible. During the project, a flight control concept for the BWB configuration is developed and the most promising selected from the previous designed to control systems. Different safety concepts (eg. fail safe or fail operational) are examined. The developed flight control concept is examined in terms of performance, feasibility and safety and the tool chain used is evaluated in terms of costs and benefits.