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Broadband oscillator cross drive underwater acoustic transducer

An underwater acoustic transducer and cross-drive technology, which is applied in the direction of sound-generating devices and instruments, can solve the problems of large mechanical quality factor, application limitation, and narrow bandwidth, and achieve the effect of increasing the working bandwidth, compact structure, and small volume

Inactive Publication Date: 2014-01-01
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the common problems of this type of transducer are that the mechanical quality factor is large and the bandwidth is very narrow, which may affect the application in underwater acoustic communication and underwater acoustic countermeasures.
[0008] This kind of transducer structure with internal oscillators cross-driven has the common defect of other types of flextensional transducers, that is, the bandwidth is very narrow. Although it has many advantages, if the transducer cannot work with broadband, it will be severely affected in application. big limit

Method used

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  • Broadband oscillator cross drive underwater acoustic transducer
  • Broadband oscillator cross drive underwater acoustic transducer
  • Broadband oscillator cross drive underwater acoustic transducer

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Embodiment approach 1

[0030] combine Figure 1~3 In this embodiment, straight beams 1 and curved beams 2 are alternately connected to form an external shell, which can be made of aluminum alloy materials or other lightweight materials such as carbon fiber and titanium alloy. The curved beams 2 are all bent toward the inside of the transducer , the straight beam 1 is rigidly connected with each vibrator assembly inside.

[0031] There are two kinds of vibrator assemblies in this embodiment, figure 1 The first type of vibrator assembly in the vertical direction is composed of ceramic crystal stack 5 , inner transition block 4 and outer transition block 6 . The ceramic crystal stack 5 is formed by connecting 16 piezoelectric ceramic square pieces in parallel. The size of each square piece is 40mm×100mm×4mm. There are copper electrode pieces sandwiched between the two square pieces, and the electrode leads are drawn from the electrode pieces. The ceramic crystal stack is bonded to the inner transitio...

Embodiment approach 2

[0040] combine Figure 4 , the broadband vibrator cross-drive underwater acoustic transducer has only one kind of vibrator assembly inside, and the vibrator assembly is composed of ceramic crystal stack 5 , inner transition block 4 and outer transition block 6 . When the transducer is working, the ceramic crystal pile 5 produces longitudinal vibration due to the piezoelectric effect, and the vibration displacement is transmitted to the arc beam 2 through the straight beam 1, causing each arc beam to vibrate with equal amplitude and in phase, thereby radiating sound energy to the external water medium.

[0041] The rest of this embodiment is the same as Embodiment 1.

Embodiment approach 3

[0043] combine Figure 5 , There is only one vibrator assembly inside the broadband vibrator cross-drive underwater acoustic transducer, and the vibrator assembly is composed of a rare earth rod 11 , a permanent magnet piece 10 , a coil 8 and a coil bobbin 9 . When the transducer is working, the rare earth rod 11 produces longitudinal vibration due to the magnetostrictive effect, and the vibration displacement is transmitted to the curved beam 2 through the straight beam 1, causing each curved beam to vibrate with equal amplitude and in phase, thereby radiating sound energy to the external water medium.

[0044] The rest of this embodiment is the same as Embodiment 1.

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Abstract

The invention aims to provide a broadband oscillator cross drive underwater acoustic transducer which comprises an external shell, wherein the external shell is formed by arranging four straight beams and four arc-shaped beams in an enclosed mode; the included angle formed by adjacent straight beams is 90 degrees, and one arc-shaped beam is arranged between every two adjacent straight beams in a connected mode; each arc-shaped beam is of an inward concave arc shape; a central mass block is arranged at the center inside the external shell, wherein a group of excitation materials is installed between the central mass block and each straight beam; an upper cover plate is installed on the top of the external shell, a lower cover plate is installed at the bottom of the external shell, the upper cover plate is connected with the lower cover plate through threaded rods to seal the external shell, and the upper cover plate is provided with a cable which is communicated with the excitation materials. By adopting the hybrid excitation principle, the operation bandwidth of an oscillator cross drive transducer is increased remarkably; the broadband oscillator cross drive underwater acoustic transducer can be applied to hydroacoustic positioning, detection, navigation, communication, hydrologic condition testing, marine resource exploration and other fields.

Description

technical field [0001] The invention relates to a transducer device in the field of underwater acoustics. Background technique [0002] With the rapid development of noise reduction technology, it becomes more and more difficult to accurately and timely detect submarines and other underwater objects. Therefore, active sonar has attracted widespread attention and gradually replaced traditional passive sonar. Correspondingly, higher requirements are put forward for the performance of the transmitting transducer used in active sonar. Low frequency, broadband, and small size are all important directions for the development of transmitting transducers. [0003] In order to improve the detection distance and detection performance of active sonar, the transducer needs to emit low-frequency signals for long-distance detection. At the same time, the broadband performance of the transducer is also very important. The most fundamental motivation for applying broadband sonar is to impr...

Claims

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Application Information

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IPC IPC(8): G10K9/12G10K9/122G10K11/00
Inventor 蓝宇李宽卢苇
Owner HARBIN ENG UNIV
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