Speaker that uses the non-linearity in air to create sound

University essay from Blekinge Tekniska Högskola/Avdelningen för maskinteknik

Abstract:

The aim of this work was to investigate theoretically and experimentally the fact that it is possible to create sound by using the nonlinearity in air. A speaker was built verifying the theory that if at least two high frequencies at high amplitude is propagating through a nonlinear medium, for example air, the difference frequency of these two is created in mid air. Measurements and simulations were performed on what the pressure distribution from a ultrasonic transducer looks like.

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