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Non-linear Acoustic Waves in Resonators  

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Non-Linear Acoustic Waves in Resonators 

     The concept of an acoustical resonator has been around since the 1930’s but until recently it was believed that the pressure waves produced could not carry large amounts of energy because acoustic saturation would be reached and the wave would shock limiting the amplitude of the pressure wave.  It was found that by creating different shaped resonating chambers (as opposed to the cylindrical chambers which have been the focus of study in the past) the energy in the wave could be trapped in the lower harmonics and prevent the shocking of the wave.  Using this method, large pressure amplitudes can be achieved within the resonator when the resonator is driven at its resonant frequency.  This technology can be used to make devices such as pumps and compressors.

   The focus of research at Illinois Institute of Technology has been to develop a numerical model to accurately predict the waveform produced by a given resonator and to develop an optimization routine in order to produce the most efficient resonators.

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