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M. Fuhrmann:
"Non-linear control and disturbance rejection for longitudinal tunnel ventilation";
Supervisor: S. Jakubek, N. Euler-Rolle; Institut für Mechanik und Mechatronik, 2016; final examination: 2016-09-28.

Tunnel ventilation control plays a key role in tunnel fire safety, nevertheless there is considerable scope for improving conventional control schemes. This master´s thesis proposes a practical approach on how to improve the disturbance attenuation ability of longitudinal tunnel ventilation systems by adding a non-linear unknown input observer to a two-degrees-of-freedom control scheme in order to establish active disturbance rejection. The focus of attention is on tunnels using jet fans for fresh air supply. To give a holistic view on longitudinal tunnel ventilation a zero-dimensionless tunnel model is introduced and two different kinds of feedforward control are presented in advance. Conventional control does not specifically take into account external disturbances that tunnels are exposed to due to the momentum introduced by moving vehicles and meteorological circumstances like wind load onto the portals, or meteorological pressure differences between the portals of a tunnel. The proposed control scheme provides promising simulation as well as experimental results of a real tunnel implementation. The observer and rejection scheme convergence is proven based on Lyapunov theory.