CN1328595C - 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. It includes the base array frame, and is equipped with sound insulation layer, sonar array and layering strips sequentially from the inner side of the base array frame; between the sound insulation layer and the sonar array, sound baffles and rubber pads are sequentially installed from the inside to the outside, and the acoustic The two sides of the baffle are 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 pass through the rubber pad and the array frame. The wires of the piezoelectric sheet close to the hull of the ship 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 target ships in the low-frequency range is relatively large, and sea water absorbs low-frequency sound waves less, 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 It is basically the same, which 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:

It includes the base array frame, and is equipped with sound insulation layer, sonar array, sealing rubber and bead in order from the inner side of the base array frame; between the sound insulation layer and the sonar array, the sound baffle and rubber are installed in sequence from the inside to the outside The two sides of the acoustic baffle are 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 pass through the rubber pad and the base array. The wires of the piezoelectric sheet close to the hull of the ship are drawn out through the sound insulation layer and the array 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 includes a base array frame 3, and a sound insulation layer 4, a sonar array 7, a sealing rubber 9 and a bead 5 are sequentially installed from the inside of the base array frame 3 to the outside; Between the sound insulation layer 4 and the sonar array 7, a sound baffle 8 and a rubber pad 6 are sequentially installed from the inside to the outside, and the two sides of the sound baffle 8 are respectively symmetrically pasted with more than one pair of piezoelectric sheets 10 (4 pairs in Fig. 3 ). , the piezoelectric sheets 10 are connected with wires, the wires connected to the piezoelectric sheets 10 on the sound baffle 8, the wires near the sonar array 7 pass through the rubber pad 6 and the base array frame 3, and the wires near the ship hull 1 The lead wires of the piezoelectric sheet 10 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 kind of side sonar array sound barrier device with noise reduction, comprise base array rack (3), and sound insulating layer (4) outwards is housed successively from base array rack (3) medial surface, sonar battle array (7), caulking gum (9) and press strip (5), it is characterized in that: sound baffle (8) and rubber blanket (6) are housed between sound insulating layer (4) and sonar battle array (7) from inside to outside successively, piezoelectric patches (10) more than 1 pair is pasted on the two sides of sound baffle (8) symmetry respectively, piezoelectric patches (10) all is connected with lead, sound baffle (8) is gone up the lead that piezoelectric patches (10) is joining, the lead of close sonar battle array (7) passes rubber blanket (6) and base array rack (3) is drawn, and the lead of the piezoelectric patches (10) of close ship shell (1) passes sound insulating layer (4) and base array rack (3) is drawn.

2, a kind of side sonar array sound barrier device according to claim 1 with noise reduction, it is characterized in that: the piezoelectric patches (10) that paste respectively on described sound baffle (8) two sides is 1～10 pair, piezoelectric patches (10) material is a lead titanate-zirconate, and the material of sound baffle (8) is a metal material.

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