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M. Weisser, S. Bolk, S. Staudacher
The altitude test facility (ATF) of the University of Stuttgart at the Institute for Aircraft Propulsion Systems (ILA) is a complex test facility which is used to test aero-engines and their components under altitude conditions. The ATF provides the total pressure and temperature at the inlet as well as the altitude pressure at the nozzle exit of the test object according to the conditions occurring during flight operations. At present, a model-based controller is available to adjust the altitude conditions during test facility operation. The ATF control system is a complex and safety-critical system, and thus faults may cause damage to the test object or the test facility. Therefore, thorough testing of the ATF control system including hardware and software is essential to ensure system integrity and reliability after changes of source code or modifications of the control hardware. A modular numerical performance model is available to simulate the steady-state and the dynamic operational behaviour of the altitude test facility. The modular approach permits the integration of test objects into the simulation. In addition the model-based controller must be included in the simulation in order to understand the dynamic interaction between test object, ATF control and test facility . The existing model-based controller was extended by a feedforward controller. The Software-in-the-loop (SIL) simulation of controller and test facility offered a simple and cost-efficient way to verify the closed loop system requirements. For validation purposes a Hardware-in-the-loop (HIL) simulation was set up. A real-time capable performance model of the altitude test facility has been developed. The real-time simulation provided both synthetically generated sensor data and disturbance data for the ATF control system. The HIL simulation was used to perform functional tests of the I/O devices and the graphical user interface. The limits of controlled operation could be tested without endangering the test facility or the test object. Tests using a passive test object were conducted in order to validate the simulation and to demonstrate the functionality of the ATF control system. Furthermore, the improved performance of the feedforward controller could be shown during the test campaign.
Deutscher Luft- und Raumfahrtkongress 2013, Stuttgart
Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn, 2013
21,0 x 29,7 cm, 6 Seiten
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