Definition

Ultrasonic vibrator is also called ultrasonic vibrator. The whole body connecting the transducer and the amplitude transformer in the industry is called vibrator. It refers to a device that realizes the mutual conversion of electrical energy and mechanical energy (acoustic vibration) by the piezoelectric effect of piezoelectric ceramics, and amplifies through the front and rear radiation cover blocks matched with acoustic impedance.

Principle of ultrasonic vibrator

The horn is a passive device, which does not generate vibration itself, but only transmits the input vibration after changing the amplitude to complete the impedance transformation. The ultrasonic transducer can produce regular vibration under appropriate electric field excitation, and its amplitude is generally 10μM, such amplitude is not enough to directly complete the welding and processing procedures. Therefore, after the transducer is connected to the reasonably designed horn, the amplitude of the ultrasonic wave can vary in a large range. As long as the material strength is sufficient, the amplitude can exceed 100μm。

When the luffing rod is subject to longitudinal expansion and vibration, the moving directions of the particles on the left and right sides of a cross section between them are just opposite, which is equivalent to the existence of a relatively static node surface. This node is called a node, which is also the best fixed point of the vibrator. Deviation from this node will reduce the working efficiency of the vibrator, commonly known as leaky wave.