Simulation of an algorithm for the active control of combustion noise
Abstract
The simulation of an algorithm for the active control of combustion noise generated
by a turbulent flame produced by an open burner is developed in this thesis. The simulation
includes (1) an autoregressive model of real combustion noise, (2) a feedback
loop based on the "observer" method, (3) a model of the transfer function between the
acoustic driver and the sensor through the flame, and (4) a method to take into account
the time-delay due the calculation of the algorithm. A practical implementation of the
control strategy is also proposed.
An attenuation of up to 40 dB is obtained in the 0 - 3000 Hz band, decreasing with
the time-delay required for creation of the feedback signal. The influence of the order
of the autoregressive model is studied, and it is shown that better results are obtained
by increasing the order. The choices for the location of the activator and for the type
of sensor are investigated and discussed. Further analytical research on the method of
computing the feedback signal in the presence of time-delay is identified.
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- Masters Theses [19662]