CN1588121A - Side sonar array sound barrier device with noise reducing - Google Patents

Abstract

The invention discloses a side sonar array sound barrier device with noise reduction. Including the sound insulation layer, sonar array and layering strips installed from the inside to the outside of the array frame; the sound baffle and rubber pads are installed from the inside to the outside between the sound insulation layer and the sonar array, and the two sides of the sound baffle Paste more than one pair of piezoelectric sheets symmetrically, and the piezoelectric sheets are connected with wires. The wires connected to the piezoelectric sheets on the sound baffle, and the wires close to the sonar array pass through the rubber pad and the base array frame, and are close to the ship hull. The wires of the piezoelectric sheet of the body are led out through the sound insulation layer and the array frame. The invention is equipped with a sound baffle between the sound insulation layer and the sonar array, which can effectively reduce the noise radiated from the hull of the ship to the sonar array and improve the detection distance of the sonar.

Description

Broadside sonar array barrier with noise reduction

technical field

The invention relates to a noise control device, in particular to a side sonar array sound barrier device with noise reduction.

Background technique

Sonar equipment has the functions of detecting, locating, identifying and tracking/moving targets in water. It is an important means for modern ships to detect targets in water, and has a wide range of applications in many fields such as military and civilian use. With the development of science and technology and the confrontation between identification and anti-identification, the performance of sonar is continuously improved and perfected. For example, due to the emergence of stealth (covering anechoic tile) submarines, the detection performance of the more mature medium and high frequency active sonars has declined, and low frequency active sonars (Low frequency active sonar, LFAS) have emerged as the times require. This is because low-frequency sonar (including active and passive) has the following advantages: the radiation noise of the target ship in the low-frequency range is relatively large, and the absorption of low-frequency sound waves by sea water is small, which is beneficial to increase the detection distance. Therefore, the research on low-frequency sonar has become an important direction in the current sonar research.

As we all know, the detection range of sonar and the accuracy of target recognition are closely related to the size of the noise signal. As the noise signal increases, the detection range and target recognition accuracy will decrease. For low-frequency sonar, the impact of noise is particularly important. This is because the operating frequency of low-frequency sonar is generally tens of hertz to several thousand hertz, and the radiated noise generated by ships during navigation, such as mechanical noise, propeller noise and hydrodynamic noise, as well as ocean background noise and sonar operating frequency Basically consistent, this brings great difficulties to the analysis of the signal reflected from the measured target and its radiation noise, and the conventional very useful filtering method will lose its reason for existence.

Noise reduction is another important way to improve the signal-to-noise ratio of sonar. There are many ways to reduce noise. The invention adds a sound baffle to the structure of the sonar array, and uses the angle of actively suppressing the sound radiation of the sound baffle to reduce noise. The basic idea is as follows: paste piezoelectric sheets on the upper and lower surfaces of the sound baffle, , so that the acoustic radiation power of the baffle is minimized, thereby suppressing the acoustic radiation of the acoustic baffle, and improving the signal-to-noise ratio of the sonar array.

Contents of the invention

In order to isolate or reduce the noise radiated from the ship to the sonar array, the object of the present invention is to provide a side sonar array sound barrier device with noise reduction.

The technical solution adopted by the present invention to solve its technical problems is:

Including that the sound insulation layer, sonar array, sealing rubber and bead are installed sequentially from the inside to the outside of the array frame; the sound baffle and rubber pad are sequentially installed between the sound insulation layer and the sonar array from the inside to the outside, and the sound barrier The two sides of the board are respectively symmetrically pasted with more than one pair of piezoelectric sheets, and the piezoelectric sheets are connected with wires. The wires connected to the piezoelectric sheets on the sound baffle, and the wires close to the sonar array are led out through the rubber pad and the array frame, and close to the sonar array. The lead wires of the piezoelectric sheets of the ship shell are led out through the sound insulation layer and the matrix frame.

There are 1 to 10 pairs of piezoelectric sheets pasted on both sides of the acoustic baffle, the piezoelectric sheet is made of lead zirconate titanate, and the acoustic baffle is made of metal.

The beneficial effect of the invention is that a sound baffle is installed between the sound insulation layer and the sonar array, which can effectively reduce the noise radiated from the hull of the ship to the sonar array and improve the detection distance of the sonar.

Description of drawings

Fig. 1 is a side view and a control diagram of the structure of the present invention;

Fig. 2 is the A direction view of Fig. 1 structure;

Fig. 3 is a schematic diagram of the piezoelectric sheet attached to the acoustic baffle in the present invention.

In the figure: 1. Ship shell, 2. Damping layer, 3. Array frame, 4. Sound insulation layer, 5. Beading, 6. Rubber pad, 7. Sonar array, 8. Acoustic baffle, 9. Sealing rubber, 10, piezoelectric sheet.

Detailed ways

As shown in Fig. 1, Fig. 2 and Fig. 3, the present invention comprises that the sound insulation layer 4, the sonar array 7, the sealing rubber 9 and the bead 5 are sequentially installed from the base array frame 3 from the inside to the outside; Acoustic baffles 8 and rubber pads 6 are sequentially installed between the sonar arrays 7 from the inside to the outside. The two sides of the acoustic baffles 8 are symmetrically pasted with more than one pair of piezoelectric sheets 10 (four pairs in FIG. 3 ), and the piezoelectric sheets 10 All are connected with wires, the wires connected to the piezoelectric sheet 10 on the sound baffle 8, the wires close to the sonar array 7 pass through the rubber pad 6 and the base array frame 3, and the wires near the piezoelectric sheet 10 of the ship hull 1 The wires are drawn out through the sound insulation layer 4 and the matrix frame 3 .

There are 1 to 10 pairs of piezoelectric sheets pasted on both sides of the acoustic baffle 8 , the piezoelectric sheet is made of lead zirconate titanate, and the acoustic baffle 8 is made of metal materials such as Fe and Al.

The working principle of the present invention is as follows:

The array frame 3 is installed on the ship hull 1 through the damping layer 2, and the piezoelectric sheet 10 is pasted on the upper and lower surfaces of the acoustic baffle 8, wherein the piezoelectric sheet on one side is used as a sensor, and the other side is used as a controller. The noise signal of the noise signal is transformed into a numerical signal through the secondary instrument and A/D conversion, the feedback control signal is output by the industrial computer, and then transmitted to the controller through the D/A conversion and power amplifier, thereby suppressing the sound radiation of the sound baffle.

Claims (2)

1. A side sonar array sound barrier device with noise reduction, comprising a sound insulation layer (4), a sonar array (7), and a sealing rubber (9) from the base array frame (3) from the inside to the outside. ) and layering strip (5), it is characterized in that: a sound baffle (8) and a rubber pad (6) are sequentially installed between the sound insulation layer (4) and the sonar array (7) from the inside to the outside, and the sound baffle ( The two sides of 8) are symmetrically pasted with more than one pair of piezoelectric sheets (10) respectively, and the piezoelectric sheets (10) are connected with wires, and the wires connected with the piezoelectric sheets (10) on the sound baffle (8) are close to the sonar array. The wire of (7) passes through the rubber pad (6) and the array frame (3), and the wire of the piezoelectric sheet (10) close to the ship hull (1) passes through the sound insulation layer (4) and the array frame (3) lead out. 2. A side sonar array sound barrier device with noise reduction according to claim 1, characterized in that: the piezoelectric sheets (10) pasted on both sides of the sound baffle (8) are 1- 10 pairs, the piezoelectric sheet (10) is made of lead zirconate titanate, and the material of the acoustic baffle (8) is metal.