Integration of aircraft systems into conceptual design synthesis

  • Integration von Flugzeugsystemen in den Flugzeugvorentwurf

Lammering, Tim; Stumpf, Eike (Thesis advisor)

Aachen (2014)
Dissertation / PhD Thesis

Aachen, Techn. Hochsch., Diss., 2014


In the scope of this thesis, a methodology for modeling of entire system architectures of commercial transport aircraft is presented. The author's approach facilitates technology assessment of innovative system technology on aircraft-level in conceptual and early preliminary aircraft design. It closes the existing gap of sound systems modeling in early aircraft design synthesis. The proposed methodology uses a strictly function-driven approach for sizing of the single aircraft systems according to the dedicated aircraft-level functions. System weight and maximum as well as mission dependent power off-takes are estimated. The principle of energy balance is used to derive the power demand of the single systems. A modular and flexible approach has been chosen that allows for fast variation of the system architecture. Thus, investigation of large design spaces is possible. For integration and assessment of innovative systems technology, a probabilistic framework is introduced that incorporates remaining uncertainties. The proposed system model has been integrated into the Institute's of Aeronautics and Astronautics (ILR) Multidisciplinary Integrated Conceptual Aircraft Design and Optimization (MICADO) environment. Thus, repercussions of system integration, e.g. on aircraft efficiency or performance, can be captured in a highly integrated environment. The proposed systems model is a valuable tool for sound assessment of innovative system technology on overall aircraft-level already in conceptual aircraft design. The proposed systems model has been validated against two commercial transport aircraft. Additionally, comprehensive sensitivity studies show dependencies and identify the main design drivers of the single systems. Two case studies show the added-value of integration of the proposed systems model into early aircraft design synthesis. The first case study concentrates on evaluation of the impact of engine power off-takes on aircraft performance and efficiency. The second design study focuses on integration of innovative technology into the overall system architecture and on application of the proposed probabilistic framework for considering the remaining uncertainties in design and technology assessment.