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A Directional Quadrilateral Flextensional Transducer

A flextensional transducer and quadrilateral technology, used in instruments, sounding instruments, etc., can solve problems such as complicated circuits, and achieve the effect of amplifying the effect of low-frequency radiation and saving excitation energy.

Active Publication Date: 2020-09-11
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This flextensional transducer is driven separately by two sets of piezoelectric stacks. When the two sets of excitations are adjusted to reach an appropriate phase, the radiating surface of the transducer does not move while radiating, showing a cardioid directivity. It can be seen that this The circuit in the design is relatively complicated, and special attention should be paid to the design of the circuit part

Method used

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  • A Directional Quadrilateral Flextensional Transducer
  • A Directional Quadrilateral Flextensional Transducer
  • A Directional Quadrilateral Flextensional Transducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] combine figure 1 , the invention discloses a directional quadrilateral flexural transducer, comprising an excitation vibrator 1, a radiation shell 2, a central mass 3 and a transition block 4; the radiation shell 2 is composed of four sets of concave bending beams and four A closed shell formed by alternating connection of groups of straight beams, transition blocks 4 are respectively installed on the inner walls of the four groups of straight beams, and the four groups of transition blocks 4 are respectively connected with two groups of long excitation vibrators and two groups of short excitation vibrators, and two groups of long excitation vibrators It forms a cross drive structure with two groups of short excitation vibrators, the four groups of excitation vibrators 1 are perpendicular to each other, and the other ends of the four groups of excitation vibrators 1 are connected to the central mass 3 together.

[0037] combine Figure 4, the material of the excitation...

Embodiment 2

[0045] Same as Example 1, the difference is:

[0046] combine Figure 5 , the excitation vibrator 1 in this embodiment is a rare earth giant magnetostrictive rod 8 made of rare earth giant magnetostrictive material, a group of excitation coils 6 are wound around the periphery of the rare earth giant magnetostriction rod 8, and the excitation coil 6 is enclosed in a high magnetic permeability In the closed magnetic circuit of the permanent magnet piece 7 made of high-rate material, the sum of the lengths of the rare earth giant magnetostrictive rod 8 and the transition block is greater than the distance between the central mass block 3 and the inner wall of the corresponding straight beam. The pressure generated by increasing the distance between the inner wall of the corresponding straight beam and the central mass 3 makes the rare earth giant magnetostrictive rod 8 fixed between the inner wall of the straight beam and the central mass 3, and the rare earth giant magnetostrict...

Embodiment 3

[0048] Same as Example 1, the difference is:

[0049] combine Image 6 , the excitation vibrator 1 in this embodiment is a piezoelectric crystal stack with rare earth giant magnetostrictive rods 8, and the length of the two sets of rare earth giant magnetostrictive rods 8 is greater than the length of the two sets of piezoelectric crystal stacks.

[0050] In this embodiment, the excitation vibrator 1 can not only use piezoelectric crystal stacks and rare earth giant magnetostrictive rods, but also use round rods made of other ferroelectric materials or antiferroelectric materials and rare earth giant magnetostrictive materials.

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Abstract

The invention discloses a directivity four-side type flextensional transducer. The directivity four-side type flextensional transducer comprises excitation oscillators 1, a radiant shell body 2, a central mass block 3 and transition blocks 4; the radiant shell body 2 is a closed shell body which is formed by alternate connecting of four groups of concave bent beams and four groups of straight beams; the transition blocks 4 are correspondingly mounted on the inner walls of the four groups of straight beams; the two groups of long excitation oscillators and two groups of short excitation oscillators are correspondingly connected to the rear of the four groups of transition blocks 4 and constitute a cross driving structure; and the four groups of excitation oscillators 1 are perpendicular to each other, and the other ends of the four groups of excitation oscillators 1 are all connected to the central mass block 3. According to the directivity four-side type flextensional transducer, asymmetric radiant surfaces are matched with asymmetric excitation modes, so that strong contrast is formed between the two front-back opposite radiant surfaces, and heart-shaped directivity emission is formed; and the application range is wide, and the directivity four-side type flextensional transducer can be applied to the field such as low frequency active sonar, remote communication, earthquake sound propagation research and marine geological research.

Description

technical field [0001] The invention belongs to the technical field of water energy transducers, in particular to a directional quadrilateral flexural transducer. Background technique [0002] Underwater acoustic equipment is an important ocean observation equipment, which uses sound waves to carry information to detect and identify underwater targets. The transducer is a key component of underwater acoustic equipment, which relies on it to exchange electrical and acoustic energy. According to different working conditions, transducers are divided into two categories: transmitting transducers that convert electromagnetic energy into acoustic energy and receiving transducers that convert acoustic energy into electromagnetic energy, or hydrophones. The transmitting transducer converts the electromagnetic vibration energy into mechanical vibration energy, thereby pushing the water medium to vibrate, converting the electrical signal into an acoustic signal propagating in the oce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10K9/12G10K9/122
CPCG10K9/121G10K9/122
Inventor 蓝宇王秋木李宽
Owner HARBIN ENG UNIV