ANALYSIS OF HARMONIC DISTORTION IN ELECTROACOUSTIC TRANSDUCERS

Nonlinear transducer equations are formulated for the six major types of electroacoustic transducers (electrostatic, variable reluctance, mo ving coil, piezoelectric, electrostrictive, aid magnetostrictive) in a common form using the various physical and mathematical similarities among the transduction mechanisms. The common nonlinear equation is so lved approximately by perturbation analysis giving simple expressions and graphs for harmonic amplitudes caused by all the frequently occurr ing nonlinear mechanisms. The expressions acid graphs can be applied t o all the transducer types by using nonlinear parameters tabulated for each type. These results can facilitate diagnosis of the cause of mea sured harmonics, prediction of harmonics during design, and developmen t of electrical drives to suppress harmonics. (C) 1995 Acoustical Soci ety of America.