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Active Control of Thermoacoustic Instabilities in a Rijke Tube System


T. Schalch

Semester Thesis, FS15 (10415)

An active control system for suppressing the thermoacoustic instabilities in a Rijke tube is investigated in this semester thesis. A simple Rijke tube set-up consisting of a straight cylindrical Pyrex glass tube and a hand-made electrical heating element is built. The feedback control system consists of a microphone with the corresponding circuits, a loudspeaker, an audio amplifier and a digital real-time FPGA controller from National Instruments. Various experiments are performed to investigate the Rijke tube system. A system identification procedure is used to gain information about the dynamics of the system. The results are compared to simulations in Matlab based on existing models. Various controllers are realised using the digital controller and the graphical programming platform LabVIEW. The experimental behaviour of the controllers is compared to the expected behaviour according to Matlab simulations. Furthermore, a new controller design with a band-pass filter inserted in the feedback loop is proposed and realised with the digital controller. The performance of this improved controller is found to be clearly better than the existing controllers.

Supervisors: Stanislaw Pietrzko, Roy Smith


Type of Publication:

(13)Semester/Bachelor Thesis

R. S. Smith

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% Autogenerated BibTeX entry
@PhdThesis { Xxx:2015:IFA_5189
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