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Near-field acoustic holographic calibration and measurement method for impedance characteristic of planar sonar array

A technology of near-field acoustic holography and impedance characteristics, applied in radio wave measurement systems, climate sustainability, instruments, etc., can solve problems such as inaccurate monitoring results, unfavorable ship monitoring, and impact on ship operation.

Active Publication Date: 2019-03-08
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When human beings explore the ocean, they cannot do without the ship, and to grasp the operation of the ship in the ocean is mainly to monitor the active sonar of the ship based on the underwater sound. If the underwater sonar at the ship is of low frequency, it is not conducive to monitoring the ship, resulting The monitoring results are inaccurate, which affects the judgment of the ship's operation

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  • Near-field acoustic holographic calibration and measurement method for impedance characteristic of planar sonar array
  • Near-field acoustic holographic calibration and measurement method for impedance characteristic of planar sonar array
  • Near-field acoustic holographic calibration and measurement method for impedance characteristic of planar sonar array

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Embodiment 1

[0101] refer to figure 1 , the planar sonar array impedance characteristic near-field acoustic holography calibration measurement method in the present embodiment comprises the following steps:

[0102] a. Calculation method of impedance characteristics of planar emission array

[0103] The transmitter will be affected by the sound field while radiating sound waves, which is expressed as the force exerted by the medium close to the vibration surface, which is equal in value and opposite in direction to the force applied to the medium by the vibration surface, depending on the proximity The sound pressure in the medium on this surface, according to the integral of the sound pressure distribution on the emitting surface along the vibrating surface, the force of the medium on the vibrating surface can be obtained, and the sound pressure in the sound field is proportional to the particle velocity of the medium at this place, that is:

[0104] P=u·Z 0 (1)

[0105] It can be con...

Embodiment 2

[0263] In this embodiment, on the basis of Embodiment 1, the simulation analysis in step d includes the following aspects:

[0264] d1. Influence of sound field measurement geometric parameters on calibration results

[0265] (1) The influence of windowing function on the calibration result;

[0266] (2) Radius of holographic surface: 0.5λ~20λ;

[0267] (3) Measuring point spacing: 0.1λ~0.5λ;

[0268] (4) The distance between the holographic surface and the sample to be calibrated: 0.1λ~0.25λ;

[0269] (5) Spacing between double hydrophones: 0.05λ~0.5λ;

[0270] d2. Calibration error analysis under different sonar array structures

[0271] (1) Eight-element array (2×4): 2m×1.3m;

[0272] (2) Nine-element array (3×3): 3m×1m;

[0273] (3) Nine-element array (9×1): 1m×3m;

[0274] d3. Analysis of calibration errors caused by random measurement errors and systematic errors caused by environmental interference, electrical noise and other factors;

[0275] d4. Analysis of th...

Embodiment 3

[0277] In this embodiment, on the basis of Embodiment 2, in the step F, it is necessary to build a calibration measurement system for the near-field acoustic holography of the impedance characteristics of the planar sonar array, specifically according to the established low-frequency planar sonar array impedance characteristic near-field acoustic holography theory Test the model and establish a near-field acoustic holographic multi-channel measurement system. The measurement receiving system is composed of a measurement hydrophone array, a signal attenuator, an acquisition system and a computer, such as figure 2 as shown,

[0278] (1), hydrophone array

[0279] It consists of 32 hydrophones to form a measuring and receiving linear array; every two hydrophones constitute a set of sound intensity probes, a total of 16 pairs of sound intensity probes (or use 160 hydrophones to form 80 pairs of sound intensity probes, each pair of sound intensity Probe spacing is 20cm); 32 B&K81...

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Abstract

A near-field acoustic holographic calibration and measurement method for an impedance characteristic of a planar sonar array belongs to the technical field of research on the near-field acoustic holographic measurement method for the impedance characteristic of large planar emission arrays. The method is characterized by including an impedance characteristic calculation method of the planar emission array; a radiation impedance calibration method based on near-field acoustic holography; a BAHIM method based near-field acoustic holographic transformation method and algorithm; value simulation via a radiation impedance calibration method based on near-field acoustic holography; and establishment of a near-field acoustic holographic theoretical test model for the impedance characteristic of alow-frequency planar sonar array. Acoustic characteristic calibration demands of an active sonar device can be monitored according to water sound, research on basic principles of near-field acousticholographic calibration for the impedance characteristic of the planar sonar array, design of a near-field acoustic holographic calibration scheme, development of impedance calibration software of thelow-frequency sonar array, and near-field acoustic holographic calibration and measurement test can be implemented in a targeted way, and thus, the calibration capability of a low-frequency emissionenergy transducer calibration system can be improved, and problems in evaluating the impedance characteristic of the low frequency sonar are solved.

Description

Technical field: [0001] The invention relates to the research on the near-field acoustic holographic measurement method of the impedance characteristic of a large-scale planar emission array, in particular to a calibration measurement method of the near-field acoustic holographic method for the impedance characteristic of the planar sonar array. Background technique: [0002] The ocean occupies more than 70% of the earth's total area, and it contains a lot of energy and resources. With the continuous advancement of the world's scientific and technological level, the pace of human exploration of the ocean is accelerating, and the status of the ocean is increasing. People are increasingly aware that the ocean will become the basic environment for human survival. When human beings explore the ocean, they cannot do without ships, and mastering the operation of ships in the ocean is mainly to monitor the active sonar of the ship based on the underwater sound. If the underwater so...

Claims

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Application Information

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IPC IPC(8): G01S7/52
CPCG01S7/52004Y02A90/30
Inventor 商德江平自红肖妍韩金风刘月婵孙超
Owner HARBIN ENG UNIV
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