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Regelung eines elektropneumatischen Bleed-Air Systems

Schröffer, Andreas (2016) Regelung eines elektropneumatischen Bleed-Air Systems. Master's, Technische Universität München.

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Abstract

Conventional passenger airplanes use bleed-air to keep the cabin well pressurized and tempered for comfortable and safe travel conditions. The high pressurized bleed-air from the aircraft engine therefore has to be expanded and controlled to a constant mass flow. The bleed-air system, doing this job, consists of three valves connected through pipes. The state of art is PI control of the valves, applied in flight tests. Experience shows that in practice limit cycles occur, downgrading performance. The challenge of control consists in the little control authority, the high friction in the valves causing stick-slip action and the coupling of three valves. Three approaches are followed for developing new control strategies. The first one provides a centralized controller for all valves. Second applies different stiction compensation techniques handling the high friction level and last tries to decouple the valves through a feedforward control at the second valve. The three concepts are combined to nine controller variations. For comparing the approaches and their interdependency, each of the resulting controllers is adjusted to the bleed-air system model using global optimization. Thereby movement and integrated absolute error are rated. Effectiveness and robustness of the approaches are discussed. It is showed, that feedforward control and I-Gain Tuning account for significant control improvement. Finally, suggestions for improving the quality of model-based developing for bleed-air systems are derived from the experiments.

Item URL in elib:https://elib.dlr.de/110611/
Document Type:Thesis (Master's)
Title:Regelung eines elektropneumatischen Bleed-Air Systems
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schröffer, AndreasTUMUNSPECIFIED
Date:31 October 2016
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:105
Status:Accepted
Keywords:Control, Valve, Pneumatic, Modelica, Simulation, Modelling
Institution:Technische Universität München
Department:Institut für Regelungstechnik
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Systems and Cabin
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of System Dynamics and Control > Aircraft System Dynamics
Deposited By: Pollok, Dipl.-Ing. Alexander
Deposited On:25 Jan 2017 14:55
Last Modified:31 Jul 2019 20:07

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