A kind of sinusoidal stepped horn-shaped sound transducer and energy conversion method

Abstract

The invention belongs to the technical field of mechanical vibration, and relates to a sinusoidal stepped horn-shaped sound transducer and an energy conversion method, including a horn connected to the front cover of the transducer and a sinusoidal ladder vertically arranged inside the horn, and the sinusoidal ladder is arranged inside the horn Between adjacent vibration nodal lines, on the horn section, the intersection point of the front cover plate and the horn busbar is the origin, the extension line of the horn busbar is the x-axis, and the straight line extending from the origin to the protruding direction of the sinusoidal ladder is the y-axis, using the sinusoidal ladder Change the vibration phase of the speaker, the phase at any point on the sine step is πsin (πs), and radiate through the inner surface of the speaker and the sine step surface, and the sound pressure is superimposed on the central axis of the speaker, so that the directivity of the radiation sound field Sharp, voltage-emission response improves. The invention has the characteristics of small size, simple structure, sharp directivity of radiation sound field and high voltage emission response.

Description

technical field [0001] The invention belongs to the technical field of mechanical vibration, and in particular relates to a sinusoidal stepped horn-shaped sound transducer and an energy conversion method. Background technique [0002] The high-power radiated sound waves radiated into the fluid medium (especially into the air medium) have many applications, such as acoustic levitation, acoustic condensation, acoustic dust removal, acoustic repelling of birds, etc. In order to be able to radiate high-power sound waves into the air medium, the mechanical impedance of the transducer must be well matched with the acoustic impedance of the air medium. Currently, the most widely used is a composite bending vibration transducer proposed by Spanish scholar Gallego. It consists of a thin disk-shaped radiator and a piezoelectric sandwich longitudinal vibration transducer to form a composite vibration mode. The transducer is connected to the center of the disk. In the air medium, stron...

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Problems solved by technology

In order to be able to radiate high-power sound waves into the air medium, the mechanical impedance of the transducer must be well matched with the acoustic impedance of the air medium. Currently, the most widely used is a composite bending vibration transducer proposed by Spanish scholar Gallego. It consists of a thin disk-shaped radiator and a piezoelectric sandwich longitudinal vibration transducer to form a composite vibration mode. The transducer is connected to the center of the disk. In the air medium, strong power sound waves are radiated, and the large-area thin disc works in bending vibration mode, but it must ensure that the frequency of the thin disc-shaped radiator and the piezoelectric sandwich longitudinal vibration transducer are consistent to generate resonance when it is used. The design accuracy of the equipment is high. In addition, another disadvantage of this composite bending vibration transducer is that the diameter of the disc is larger, and the lower the frequency, the larger its size, so its volume is larger in the application environment that requires low frequency , Poor directivity in radiation sound field, low voltage emission response

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