Theoretical aspect of electromechanical transducers

Ferrite and ceramic transducers are considered. The purpose of the paper is to develop chain matrices and equivalent circuits, based on material constants and mounting parameters for frequencies from 0 to ∞. The limits of validity of the conventional schemes are outlined, taking into account the internal impedance of signal generators. The mathematical relation between magnetostriction and pie-zomagnetism is developed. Longitudinal vibration of cylindrical bars are dealt with. Formulas for vibrating bars with the electrical terminals open and short circuited are developed, as well as vibrations with electrical excitation. Pratical considerations conclude.