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Experimental optimization of driving signals for a thermoacoustic machine


M. Gross

Semester Thesis, FS15 (10403)

This project is motivated by a standing wave, loudspeaker-driven thermoacoustic cooler constructed by M. Giftthaler in a previous master project at IFA. The device designed by M. Giftthaler reached a temperature difference of over 20 degrees Celsius across the stack and a temperature of 8C at the cold side. To search for improvements of the device performance of that machine, we developed Simulink models of a TA refrigerator and investigated the efficiency of the extremum seeking algorithm, as the experimental results by Li suggest that it might be possible to reduce the time until the steady-state is achieved and the nature of the algorithm could lead to a higher temperature gradient. A successful implementation of extremum-seeking control for some initial conditions is shown, the implications and some problems of the model are presented. As control parameters, driving signals of the machine, respectively, the acoustic frequency of the loudspeaker and the amplitude of a Helmholtz resonator at the other end of the tube is used.

Supervisors: Stanislaw Pietrzko, Roy Smith


Type of Publication:

(13)Semester/Bachelor Thesis

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% Autogenerated BibTeX entry
@PhdThesis { Xxx:2015:IFA_5215
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