Ozger E.,Ingolstadt University of Applied Sciences
AIAA Atmospheric Flight Mechanics (AFM) Conference | Year: 2013
Flight test data of an unstable feedback controlled aircraft (Eurofighter) is artificially generated with added linear and nonlinear (de-)stabilizing error on the derivatives comprising also process and measurement noise that is analyzed with three estimators: equation error, output error, and wi th the new combined equation/output error methods estimating linear derivatives. The investigation focuses on the estimation performance in the equation and output error domains when the estimators are applied on nonlinear errors wi th a linear error model. Main outcome is that when the error becomes nonlinear, the matching performance degrades and the s pread in the estimates of the various estimators increases considerably where underestimation of the local characteristics such as the stability characteristics occurs. Measurement and process noise influences particularly the estimates of the secondary derivatives. If the error destabilizes the aircraft considerably even small deviations in the estimates may produces very different maneuver responses in the output error domain which makes pure equation error estimation unrel iable in this respect. Moreover, the matching performance of the estimator is best in its own domain but compromising the other domain whereas the combined estimator produces a good balance in matching performance for both equation and output error domains.
Schmidt W.,Ingolstadt University of Applied Sciences
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2011
In order to optimize academic and outside-university education in BPM it is necessary to know how educational aspects influence the quality of BPM solutions. Information regarding this topic can rarely be found. In this paper we report on a student contest which was carried out to address this problem and gather related information. An introduction is followed by information on the contest setting, the results and findings, before concluding with a summary and a description of research to be done in the future. © 2011 Springer-Verlag.
Gold R.,Ingolstadt University of Applied Sciences
International Journal of Applied Mathematics and Computer Science | Year: 2010
The control flow of programs can be represented by directed graphs. In this paper we provide a uniform and detailed formal basis for control flow graphs combining known definitions and results with new aspects. Two graph reductions are defined using only syntactical information about the graphs, but no semantical information about the represented programs. We prove some properties of reduced graphs and also about the paths in reduced graphs. Based on graphs, we define statement coverage and branch coverage such that coverage notions correspond to node coverage, and edge coverage, respectively.
Roglinger S.,Ingolstadt University of Applied Sciences
Computer Networks | Year: 2011
Intelligent Transportation Systems based on Vehicle-2-X communication have been a major research topic for several years. Meanwhile, deployment strategies for the used Vehicle-2-X systems need to be developed not only to coordinate the market introduction but also to manage the manufacturer's development projects to achieve market-ready products. Such development processes include among others testing periods as major tasks. Thus, the deployment of market-ready Vehicle-2-X system demands for test methodologies designed for that purpose. Among the first introduced Vehicle-2-X applications, intersection related ones will play a major role because of their information flow's simplicity. So, the near future calls for test methodologies particularly for those applications because testing is important for the development of market-ready systems. For that reason, a test methodology is presented which treats systems implementing intersection related Vehicle-2-X applications as systems under test. The stimulation of the system under test is based on input streams and the evaluation is based on output streams. In addition, results of a proof of concept using the Audi travolution system are enclosed. © 2011 Elsevier B.V. All rights reserved.
Ozger E.,Ingolstadt University of Applied Sciences
AIAA Atmospheric Flight Mechanics Conference 2012 | Year: 2012
This investigation presents a new estimation approach that blends equation and output error estimation. The well known equation and output error estimation methods are combined in a flexible and adjustable manner into one estimation approach where the model response and measurement comprise both state and non-state parameters of the system under test. Flight test data of Eurofighter aircraft is artificially generated with added linear error on the derivatives and also process and measurement noise that is analyzed in three domains: equation error, output error, and with the new combined equation/output error methods. Since the aircraft represents a system with highly non-linear aerodynamics and control laws, the output error approach may suffer from the close coupling of its cost function and the non-linear system properties, particularly in the presence of process and measurement noise. In contrast to this equation error being more robust, since this close coupling is bypassed, may not converge as close to the implemented errors as the output error method. The presented combined equation/output error approach blends both estimator properties and gives the engineer the possibility to benefit from both estimation approaches. © 2012 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.