METHOD AND SOURCE FOR GENERATING ACOUSTIC OSCILLATIONS

摘要

A method of generating acoustic oscillations based on the shock excitation of a magnetostrictive converter with a pulse electric signal. The electric signal is generated in the form of unidirectional half-cycles of cosinusoidal voltage having the length of one to two half-cycles of acoustic oscillations of the loaded converter. The frequency of the electric pulses is chosen equal or multiple to the frequency of the acoustic oscillations. A source of acoustic oscillations comprises a power supply unit (7), a pulse frequency unit (10) and an energy storage capacitor (6) to the plates of which the exciting winding (2) of a magnetostrictive converter (1) is connected through the power circuit of a commutating element (5). The source comprises as well an additional exciting winding (3) placed also on the magnetostrictive converter (1) and concordantly to the winding (2), an additional commutating element (8) and a unit (9) for control of the commutating elements. The additional winding (3) is connected to the plates of the capacitor (6) through the power circuit of the commutating element (8) and through the power supply unit (7), whereas the output of the pulse frequency unit (10) is connected to the input of the unit (9) for control of the commutating elements, the outputs of that unit being connected correspondingly to the control circuits of the commutating elements (5 and 8). The source of acoustic oscillations is intended preferably for ultrasound cleaning of heat exchangers from sediments.