CN202267530U - Co-vibrating vector receiver used under deep water - Google Patents

Abstract

The purpose of the utility model is to provide a co-vibration vector receiver that can be used in deep water, including an inertial unit, a piezoelectric sensitive unit, a pressure-resistant housing, a sealing unit, and a cable head. The inertial unit is a cube with ten through holes. The piezoelectric sensitive unit includes six groups of independent piezoelectric stacks, and each set of piezoelectric stacks is connected to the inertial unit. The sealing unit includes a lateral sealing cover and a main sealing cover. The sealing unit is rigidly connected to the pressure-resistant shell. The sealing unit The mechanism composed of the inertial unit and the piezoelectric sensitive unit is sealed in the pressure-resistant housing, and the cable head is installed on the main sealing cover. The utility model can work normally under 3000m water, can receive the vector information of the underwater sound field with high quality in the very low frequency range of 20-1000Hz, has strong anti-interference ability, and the watertight shell and the sensitive element are integrated and poured. The structure is simple, the reliability is strong, and it can be widely used in the field of low-frequency underwater acoustic measurement in deep water.

Description

Simultaneously resonating vector receivers that can be used in deep water

technical field

The utility model relates to an underwater receiver, in particular to a receiver with neutral buoyancy working in a deep water environment.

Background technique

Underwater receivers, commonly called hydrophones, can receive acoustic signals propagating in an underwater sound field. According to the received acoustic signal, it can be divided into sound pressure hydrophone and vector hydrophone. The sound pressure hydrophone can obtain the sound pressure signal transmitted in the underwater sound field; the vector hydrophone can obtain the sound pressure signal transmitted in the underwater sound field. Vector signals, including signals such as particle displacement, acceleration, velocity, and sound pressure gradient.

Vector hydrophones, also known as underwater vector signal receivers in foreign countries, are divided into pressure difference type and co-vibration type according to different working mechanisms. One of the devices. Compared with the classic sound pressure hydrophone, the co-vibration vector hydrophone has higher low-frequency sensitivity, more ideal low-frequency cosine pointing characteristics, small size, and lighter weight (basically neutral buoyancy underwater ), so it is widely used in various aspects of hydroacoustic engineering, especially sonobuoys.

With the increasingly urgent application requirements of vector hydrophones, the development of vector hydrophones has been developed rapidly. At present, domestic research on vector hydrophones has been basically serialized: the frequency range is from a few Hz to more than a dozen kHz or even higher, the sensitivity is from -210dB to -170dB or even higher, and the average density is close to the density of water medium 1000kg/ m3 is even lower, the physical quantities to be measured include velocity, acceleration and sound pressure gradient, the external dimensions are as large as 200-300mm, as small as 30-40mm or even smaller, and the shapes are three-dimensional spherical, two-dimensional cylindrical and one-dimensional disk, etc. ( See Chen Hongjuan. Vector Sensor. Harbin Engineering University Press, 2006; Yang Desen. Introduction to the Principle and Application of Vector Hydrophone. Science Press, 2009).

But at home, as mentioned above, the application depth of the vector hydrophone currently developed is generally only a few hundred meters (no more than 10MPa). With the continuous development of marine resources development and ocean strategy, the demand for deep sea detection equipment at home and abroad is increasing and becoming more and more urgent. As a new type of underwater receiver with huge application potential and advantages—the vector hydrophone, there are only samples that can work in the 1000m deep water environment in China (see Yang Songtao. Development of the deep water vector hydrophone[D]. Harbin Engineering University, 2010).

The United States has always been at the leading level in the world in the development and application of deep-water vector hydrophones abroad. For example, in 1988, Richard G. Adair, John A. Orcutt and William E. Farrell of the U.S. Navy led a research team to successfully use the vector hydrophone as a receiving device to conduct underwater acoustic tests at a distance of 5.5 kilometers in the South Pacific Ocean. Correlation processing of the vector signal shows that the vector hydrophone used by the group can withstand hydrostatic pressure of at least 55MPa (see: RICHARD G.ADAIR, JOHN A.ORCUTT, AND WILLIAM E.FARRELL.Infrasonic Seismic and AcousticMeasurements in the Deep Ocean.IEEE JOURNAL OF OCEANIC ENGINEERING, VOL.13, NO.4, OCTOBER 1988); in 1995, Peter F.Worcester and others from the Scripps Research Institute of California Marine Environmental University and others carried out marine environmental monitoring In the project (ATOC), the marine environmental data was extracted by placing a vertical vector hydrophone line array on the seabed at a depth of more than 2000 meters, and each line array was equipped with 40 hydrophones. , these researchers also performed separate calibration measurements on vector hydrophone elements (see: Peter F. Worcester, Kevin R. Hardy, David Horwitt, and Douglas A. Peckham. A DEEP OCEAN DATA RECOVERYMODULE.); USA Researchers from Oregon State University, Northern California State University, and the Pacific Environmental Laboratory affiliated to the National Oceanic and Atmospheric Council of the United States conducted a survey in the Pacific Ocean at a depth of 500-1500 meters at 21 degrees 25 minutes 12.6 seconds south latitude and 176 degrees 12 minutes 45.5 seconds west longitude. The seabed hydrological information detection was carried out, and the equipment used was a vertical three-element vector linear array. The experiment lasted 5 months from December 2009 to April 2010, and successfully collected the ocean sound field information of this water area (see: H.Matsumoto, D. Bohnenstiehl, R.P.Dziak1, L.Williams, R.Gliege, C.N.Meinig and P.Harben. A Vertical Hydrophone Array Coupled via Inductive Modem for Detecting Deep-Ocean Seismic and Volcanic Sources).

In addition, Russia used buoys to measure underwater noise at 1-12Hz, 32-141Hz and 282-800Hz frequencies at a depth of 3000 meters in the South China Sea in 1989, indicating that its vector hydrophone equipment can work in deep water areas around 1500m (See V.A. Shchurov. Coherent and diffusive fields of underwater acoustic ambient noise. J. Acoust. Sec. Am. 90(2), Pt. 1, August 1991: 991-1001P).

As mentioned above, although foreign countries have accumulated a lot of practical experience in the application of deep-water vector hydrophones, most of the vector hydrophones used in their experiments are differential pressure vector hydrophones, while the co-vibration vector hydrophones As far as hearing aids are concerned, there is no literature report on working at a depth of 3000m.

Contents of the invention

The purpose of the utility model is to provide a co-vibration vector receiver which can be used in deep water and can obtain the acoustic field particle acceleration vector signal in the frequency range of 20-1000 Hz in the ocean environment with a water depth of 3000 meters.

The purpose of this utility model is achieved in that:

The utility model can be used for a co-vibration vector receiver in deep water, and is characterized in that it includes an inertial unit, a piezoelectric sensitive unit, a pressure-resistant shell, a sealing unit, and a cable head, and the inertial unit is a cube with ten through holes. The piezoelectric sensitive unit includes six groups of independent piezoelectric stacks, and each set of piezoelectric stacks is connected to the inertial unit. The sealing unit includes a lateral sealing cover and a main sealing cover. The sealing unit is rigidly connected to the pressure-resistant housing. The sealing unit The mechanism composed of the inertial unit and the piezoelectric sensitive unit is sealed in the pressure-resistant housing, and the cable head is installed on the main sealing cover.

The utility model can also include:

1. The piezoelectric sheet stack includes 4 piezoelectric sheets or piezoelectric circular tubes, the piezoelectric sheets are connected in parallel, and the piezoelectric circular tubes are connected in parallel.

2. The ten through holes of the inertial unit are respectively located at the centers of the six faces of the cube and at the four vertices of the two orthogonal diagonal sections.

3. The pressure-resistant shell is a sphere with three orthogonal communication holes along the X, Y, and Z axes, and there is a plane at the intersection of the through holes and the spherical surface, and there is an O-ring groove on it.

The utility model has the advantages of:

1. Work normally under 3000m water;

2. In the 20-1000Hz very low frequency range, it can receive the vector information of the underwater sound field with high quality, and has strong anti-interference ability;

3. The watertight shell and the sensitive element are poured into one body, which is simple in structure and strong in reliability.

The utility model can be widely used in the field of deep-water low-frequency underwater acoustic measurement, such as deep-sea communication, response and detection.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the schematic diagram of the inertial unit of the present utility model;

Fig. 3 is the schematic diagram of the piezoelectric sensitive unit of the present utility model;

Fig. 4 is a schematic diagram of a pressure-resistant housing of the present invention;

Fig. 5 is a schematic diagram of the main sealing cover of the present invention.

Detailed ways

The utility model is described in more detail below in conjunction with accompanying drawing example:

1-5, the utility model includes a sensitive unit, an inertial unit, a sealing unit, a pressure-resistant shell, and connecting wires and output cables. The sensitive unit is composed of six groups of independent piezoelectric stacks, and each group of four piezoelectric stacks is connected in parallel (it can also be replaced by piezoelectric circular tubes), and the polarity of each three groups of piezoelectric stacks is the same. Each group of piezoelectric stacks is connected to the sensitive unit base on the inertial unit by bonding. The inertial unit is a cube with ten through holes, which are located at the centers of the six faces of the cube and two orthogonal pairs. At the four vertices of the corner section. The sealing unit and the pressure-resistant housing are rigidly connected through an O-ring, which seals the sensitive unit and the inertial unit in the pressure-resistant housing. The sealing unit is composed of the main sealing cover and the lateral sealing cover. The pressure-resistant shell is a sphere with three orthogonal traffic holes along the X, Y, and Z axes, and there is a plane at the intersection of the through hole and the spherical surface. Has O-ring grooves.

The utility model proposes a novel underwater high hydrostatic pressure-resistant vector receiver integrated with a sensitive device and a sealed casing. The core of the design is the design of the pressure resistance mechanism of the sensitive unit. In the 3000m deep water environment, the normal and reliable acoustic performance can be guaranteed within the frequency range of 20-1000Hz. At the same time, under different liquid conditions, the boundary damping of the sensitive element is different, and the amplitude-frequency-phase frequency characteristics are also different. Therefore, using the damping characteristics of the liquid can also effectively reduce the spurious resonance of the low-frequency sensitive structure, thereby improving the low-frequency anti-interference of the receiver. ability. In addition, the sealed shell is poured with molds and sensitive components. The shell not only plays a watertight role, but also acts as a base for the sensitive mechanism. Therefore, its design needs to be comprehensive in terms of material selection, geometric size and density. Considering the requirements of several parameters such as pressure resistance, sensitivity, volume, and weight, it is made of high-strength and low-density composite materials, and the main component is epoxy resin.

The basic theoretical basis of the utility model is that the amplitude and phase of the vibration velocity of the rigid ball immersed in the liquid under the action of underwater sound waves are consistent with the vibration velocity amplitude and phase of the liquid medium particle at the equivalent acoustic center of the rigid ball, The premise is that the maximum size of the rigid sphere is sufficiently small compared with the wavelength of the working sound wave in the underwater sound field, and has a density close to that of the water medium.

The 3000m underwater co-vibration vector receiver of the present utility model consists of an inertial unit 1 with a piezoelectric ceramic positioning groove 1a, an oil injection hole 1b, and a wiring groove 1c, and a piezoelectric ceramic 2a and an electrode piece 2b. Electric sensitive unit 2, and pressure-resistant housing 3 with threaded hole 3a, sealing groove 3b and lateral sealing cover 4, and main sealing cover 5 with sealing groove 5a, wiring groove 5b, and sealing ring 6, The cable head 7 is formed.

Firstly, the piezoelectric ceramic 2a and the electrode piece 2b are composed of the piezoelectric sensitive unit 2, and then bonded in the piezoelectric ceramic positioning groove 1a of the inertia unit 1, there are six groups in total, and at the same time, the wires are uniformly passed through the wiring groove 1c, The wiring groove 5b is connected to the output cable head 7. The sensitive unit 2 bonded to the inertial unit 1 and the pressure-resistant casing 3 are poured into one body by using the mold, and then the lateral sealing cover 4 and the main sealing cover 5 are connected to the pressure-resistant casing by the sealing ring 6 through the threaded hole 3a. 3 connections, and finally filled with oil, thus forming a complete pressure-resistant hydroacoustic receiver. At present, the diameter of the receiver is 120mm, the withstand voltage is 30MPa, the working frequency band is 20-1000Hz, the sensitivity in the working frequency band is -196dB in the underwater range of 2000-3000mm, and the horizontal sound field fluctuation does not exceed 2.5dB.

Claims (5)

1. can be used for deep water synchronous vibration type vector receiver under water; It is characterized in that: comprise inertance element, piezoelectric sensitivity unit, pressure hull, sealing unit, cable end; Inertance element is the cube that has ten through holes, and the piezoelectric sensitivity unit comprises six groups of independently piezoelectric patches heaps, and every group of piezoelectric patches heap links to each other with inertance element respectively; Sealing unit comprises lateral seal lid, primary seal lid; Sealing unit and pressure hull are rigidly connected, and sealing unit is sealed in the mechanism of inertance element and piezoelectric sensitivity unit composition in the pressure hull, and primary seal covers the installation cable end.

2. the deep water synchronous vibration type vector receiver under water that can be used for according to claim 1 is characterized in that: described piezoelectric patches heap comprises 4 piezoelectric patches or piezoelectricity pipe, the parallel connection between the piezoelectric patches, the parallel connection between the piezoelectricity pipe.

3. the deep water synchronous vibration type vector receiver under water that can be used for according to claim 1 and 2 is characterized in that: ten through holes of described inertance element lay respectively at the place, four summits to angle sections of cubical six face centers and two quadratures.

4. the deep water synchronous vibration type vector receiver under water that can be used for according to claim 1 and 2; It is characterized in that: described pressure hull is for axially having the spheroid of three positive access holes respectively along X, Y, Z; And at through hole and spheres intersect place one plane is arranged, O type circle groove is arranged on it.

5. the deep water synchronous vibration type vector receiver under water that can be used for according to claim 3; It is characterized in that: described pressure hull is for axially having the spheroid of three positive access holes respectively along X, Y, Z; And at through hole and spheres intersect place one plane is arranged, O type circle groove is arranged on it.

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