Generation of extremely nonlinear standing-wave field using loudspeaker-driven dissonant tube.

A method of generating nonlinear, pure standing-wave fields is proposed using a commercially available ordinary loudspeaker to drive easily manufactured dissonant standing-wave tubes at the first peak resonance frequencies, instead of traditional valley ones. With the transfer matrix, the dissonant properties of such standing-wave tubes with uniform cross-section (STUS), with tapered cross-section (STTS), and with abrupt cross-section (STAS) were analyzed, and extremely nonlinear pure standing-wave fields were obtained experimentally, whose sound pressure level reached 185 dB at the individual first resonance frequencies. The evolution properties of the nonlinear pure standing-wave fields in the STUS, STAS, and STTS were also investigated experimentally. The results show that the STAS provides a good approach to creating extremely nonlinear pure standing-wave field.