CN111174899A - Device and method for testing underwater mine self-guide head acoustic receiving system in air - Google Patents
Device and method for testing underwater mine self-guide head acoustic receiving system in air Download PDFInfo
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- CN111174899A CN111174899A CN201911180718.2A CN201911180718A CN111174899A CN 111174899 A CN111174899 A CN 111174899A CN 201911180718 A CN201911180718 A CN 201911180718A CN 111174899 A CN111174899 A CN 111174899A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
- G01H11/08—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means using piezoelectric devices
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Abstract
The invention discloses a device and a method for testing a torpedo self-guide head acoustic receiving system in the air, which can avoid non-uniformity errors introduced in the testing process of the torpedo self-guide head acoustic receiving system in the air and achieve the purpose of testing the sensitivity amplitude and phase consistency of each channel of the self-guide head acoustic receiving system. The technical scheme of the invention is as follows: the device for testing the underwater mine self-guide head acoustic receiving system in the air comprises: the system comprises a vibration table, a mine self-guide head, a clamp and a signal source. The mine self-guide head is arranged on the vibration table, and the foam alloy is arranged between the mine self-guide head and the vibration table. The mine self-guide head is fastened on the vibration table by a clamp. The resonance frequency of the mechanical structure formed by the vibrating table, the mine self-guide head and the clamp is higher than the working frequency band of the mine self-guide head. And the signal source is used for generating an analog self-conductance signal and driving the vibration table to vibrate.
Description
Technical Field
The invention relates to the technical field of mine self-guide heads, in particular to a device and a method for testing an acoustic receiving system of a mine self-guide head in the air.
Background
At present, an acoustic self-guiding device is adopted in a mine self-guiding warhead, and an underwater target is detected and positioned by receiving a sound wave signal or a radiation noise signal reflected by the underwater target. The acoustic detection performance of the mine self-guide head section directly affects the attack precision of the whole warhead, in order to verify and test the design and processing effects of the self-guide head section, an electro-acoustic performance test needs to be carried out on an acoustic device of the mine self-guide head section, and for the test of an acoustic receiving device of the self-guide head, the receiving amplitude and phase consistency errors of each channel of a receiving acoustic array and a signal conditioning circuit need to be tested.
Currently, the relevant test of the acoustic receiving system of the mine self-guiding head is carried out in a silencing water pool: fixing a self-guide head acoustic array underwater, arranging an underwater sound source in front of the acoustic array at a certain distance, transmitting a pulse acoustic signal by the underwater sound source, receiving the pulse acoustic signal by each array element of the received acoustic array, amplifying and filtering the pulse acoustic signal by a signal conditioning circuit, converting the amplified and filtered signal into a multi-channel electric signal and outputting the multi-channel electric signal, and representing the voltage amplitude of each channel output signal by taking the transmitting sound source level of the underwater sound source as a reference so as to represent the sensitivity of a receiving device; and comparing the waveform phase and the waveform amplitude of the voltage signals of each channel with each other to obtain amplitude and phase consistency errors. Because the test is carried out underwater, the array and the sound source are aligned in the actual measurement process by repeated adjustment, and in consideration of the water tightness safety, the water tightness test check is carried out before the underwater test, so that the receiving device is prevented from being damaged by water leakage. When equipment is produced in batches or needs to be tested repeatedly, operations such as watertight inspection, clamping water inlet, alignment test, water outlet drying and the like need to be carried out repeatedly in the actual operation process, and the working efficiency is influenced. It is therefore desirable to design a device that can perform basic performance tests in air.
At present, an attempt of testing in air by using a docking array is usually performed by using an air loudspeaker array docking method, but because the docking array is a multi-array element acoustic array with a certain aperture, the docking array for testing is also realized by using a plurality of loudspeakers, non-uniformity errors of the loudspeakers are easily introduced, and the testing result is influenced.
Disclosure of Invention
In view of this, the invention provides a device and a method for testing a naval mine self-guide head acoustic receiving system in the air, which can avoid a non-uniformity error introduced in the testing process of the naval mine self-guide head acoustic receiving system in the air, and achieve the purpose of testing the sensitivity amplitude and phase consistency of each channel of the naval mine self-guide head acoustic receiving system.
In order to achieve the purpose, the technical scheme of the invention is as follows: the device for testing the underwater mine self-guide head acoustic receiving system in the air comprises: the system comprises a vibration table, a mine self-guide head, a clamp and a signal source.
The mine self-guide head is arranged on the vibration table, and the foam alloy is arranged between the mine self-guide head and the vibration table.
The mine self-guide head is fastened on the vibration table by a clamp.
The resonance frequency of the mechanical structure formed by the vibrating table, the mine self-guide head and the clamp is higher than the working frequency band of the mine self-guide head.
And the signal source is used for generating an analog self-conductance signal and driving the vibration table to vibrate.
Further, the mine self-guiding head comprises a self-guiding head acoustic receiving system and a self-guiding head acoustic array.
The self-guide head acoustic array is positioned on the self-guide head acoustic receiving system.
The self-guide head acoustic receiving system is arranged on the vibration table, and the foam alloy is arranged between the self-guide head acoustic receiving system and the vibration table.
The self-guide head acoustic array generates a vibration response electric signal to vibration, and the sensitivity amplitude and phase consistency of each channel of the underwater mine self-guide head acoustic receiving system are obtained by utilizing the vibration response electric signal test.
Further, the self-guide head acoustic array adopts a longitudinal vibration composite rod transducer.
Further, the working frequency of the vibration table covers the working frequency range of the mine self-guide head.
Furthermore, a signal conditioning circuit is arranged in the underwater mine self-guide head acoustic receiving system and used for amplifying, filtering and outputting the response electric signals;
and reading an output signal of the signal conditioning circuit by using an oscilloscope to obtain the sensitivity amplitude and phase consistency of each channel of the underwater mine self-guide head acoustic receiving system.
The invention further provides a method for testing the underwater mine self-guide head acoustic receiving system in the air, and the device is adopted to measure the sensitivity amplitude and phase consistency of each channel of the underwater mine self-guide head acoustic receiving system.
And according to the measurement calibration certificate of the self-guided head acoustic array, obtaining acoustic receiving sensitivity and vibration acceleration sensitivity data of each array element of the self-guided head acoustic array, and calculating a conversion proportion coefficient k between the acoustic receiving sensitivity and the vibration acceleration sensitivity.
The signal source generates an analog self-conductance signal to drive the vibration table to vibrate.
The self-guide head acoustic array responds to the vibration generated by the vibrating table to generate a vibration response electric signal.
In the vibration response electric signal, the signals of all channels of the self-guide head acoustic array are compared with each other to obtain the vibration acceleration amplitude and phase consistency error.
And calculating to obtain the sound receiving amplitude and phase consistency error according to the conversion scale coefficient k.
Has the advantages that:
the invention provides a device and a method for testing a torpedo self-guide head acoustic receiving system in the air, which can avoid non-uniformity errors introduced in the testing process of the torpedo self-guide head acoustic receiving system in the air.
Drawings
Fig. 1 is a structural diagram of a device for testing an acoustic receiving system of a mine self-guiding head in the air according to an embodiment of the present invention.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The invention considers that the acoustic array of the prior mine self-guide head adopts a longitudinal vibration composite rod type piezoelectric ceramic transducer, and the transducer not only has acoustic sensitivity, but also has acceleration sensitivity: that is, the acoustic array has a response output not only to the acoustic wave but also to the vibration signal, and although the acceleration sensitivity is harmful to normal use and needs to be suppressed by measures such as vibration isolation and decoupling, it cannot be completely eliminated.
The assembled self-guide head acoustic receiving system still inevitably has vibration acceleration sensitivity, when a vibration signal is applied, the self-guide head acoustic receiving system can correspondingly output an electric signal, and the acoustic array can simultaneously provide an acceleration sensitivity and acoustic sensitivity calibration data report when the assembly delivery is completed.
Aiming at the situation, the invention adopts a vibration table as a test source, adopts foamed aluminum or foamed aluminum materials as a table top of the vibration table to conduct vibration and isolate sound wave propagation, adopts a vibration signal as a test signal, applies a vibration signal with certain amplitude magnitude and frequency to a self-guide head, collects an electric signal output by a self-guide head acoustic array receiving device in response, and compares signals of all channels with each other to obtain amplitude and phase consistency errors; the self acceleration sensitivity and the acoustic sensitivity calibration data of the acoustic array are contrasted and converted, so that the acoustic receiving amplitude and phase consistency error can be deduced
Based on the above principle, the device for testing the acoustic receiving system of the mine self-guiding head in the air provided by the embodiment of the invention comprises: the underwater mine self-guide device comprises a vibration table 1, a mine self-guide head, a clamp 4 and a signal source;
the mine self-guide head 2 is arranged on the vibration table 1, and foam alloy is arranged between the mine self-guide head and the vibration table;
the mine self-guide head is fastened on the vibration table 1 by a clamp 4;
the resonance frequency of the mechanical structure formed by the vibration table 1, the mine self-guide head and the clamp 4 is higher than the working frequency band of the mine self-guide head. The approximate rigid connection means that the resonance frequency of a mechanical structure formed by the clamp, the mine self-guide head and the vibrating table is higher than the working frequency band of the self-guide head acoustic device.
And the signal source is used for generating an analog self-conductance signal and driving the vibration table 1 to vibrate.
In the embodiment of the invention, the mine self-guiding head comprises a self-guiding head acoustic receiving system 2 and a self-guiding head acoustic array 3;
the self-guide head acoustic array 3 is positioned on the self-guide head acoustic receiving system 2;
the self-guide head acoustic receiving system 2 is arranged on the vibration table 1, and the foam alloy is arranged between the self-guide head acoustic receiving system 2 and the vibration table 1; foam metal materials are adopted between the mine self-guide head and the vibration table to transmit vibration and isolate sound waves. The foam metal material is a porous metal solid material containing bubbles, the bubbles in the foam metal material can reflect and scatter sound waves, and meanwhile, the foam metal material has the hardness and rigidity of metal, so that the foam metal material plays a role in transmitting vibration and isolating the sound waves, and the sound waves generated by a vibration table are prevented from entering a self-guide head.
The self-guide head acoustic array 3 generates a vibration response electric signal for vibration, and the sensitivity amplitude and phase consistency of each channel of the underwater mine self-guide head acoustic receiving system 2 are obtained by utilizing the vibration response electric signal test.
The underwater mine self-guide head to be measured is approximately rigidly connected with the vibration table, the vibration table vibrates integrally, and an applied excitation signal is single, so that the introduction of non-uniformity errors of a multi-loudspeaker array in a conventional air measurement method is avoided, and the accuracy of measurement of sensitivity amplitude and phase uniformity errors of each channel is improved.
In the embodiment of the invention, the self-guide head acoustic array 3 adopts a longitudinal vibration composite rod transducer.
In the embodiment of the invention, the working frequency of the vibration table 1 covers the working frequency band of the mine self-guide head. The high-frequency vibration table capable of covering the working frequency band of the mine self-guide head section is selected as the vibration table.
In the embodiment of the invention, the underwater mine self-guide head acoustic receiving system 2 is provided with a signal conditioning circuit, and the signal conditioning circuit is used for amplifying, filtering and outputting the response electric signal.
And reading an output signal of the signal conditioning circuit by using an oscilloscope to obtain the sensitivity amplitude and phase consistency of each channel of the underwater mine self-guide head acoustic receiving system.
Based on the testing device provided in the embodiment, the invention also provides a testing method of the underwater mine self-guide head acoustic receiving system in the air, and the testing method is used for measuring the sensitivity amplitude and phase consistency of each channel of the underwater mine self-guide head acoustic receiving system.
And according to the metering calibration certificate of the self-leading head acoustic array 3, obtaining acoustic receiving sensitivity and vibration acceleration sensitivity data of each array element of the self-leading head acoustic array 3, and calculating a conversion proportion coefficient k between the acoustic receiving sensitivity and the vibration acceleration sensitivity.
The signal source generates an analog self-conductance signal to drive the vibration table 1 to vibrate.
The self-guide head acoustic array 3 responds to the vibration generated by the vibration table 1 to generate a vibration response electric signal; .
In the vibration response electric signal, the signals of all channels of the self-guide head acoustic array 3 are compared with each other to obtain the vibration acceleration amplitude and phase consistency error.
And calculating to obtain the sound receiving amplitude and phase consistency error according to the conversion scale coefficient k.
According to the basic principle of physics, sound and vibration are closely related, a longitudinal vibration composite rod transducer is adopted as a transducer of the underwater mine self-guide head acoustic array, the vibration acceleration sensitivity and the sound receiving sensitivity have a direct corresponding relation, and the vibration acceleration sensitivity and the sound receiving sensitivity are generally expressed by percentage after unit conversion. If the vibration acceleration sensitivity is M and the sound receiving sensitivity is M, a simplified formula is obtained after normalization:
m＝kM
k is the conversion scaling factor.
Using a vibration signal as a test signal, applying a vibration signal with a certain amplitude magnitude and frequency to the self-guide head, collecting an electric signal output by the self-guide head acoustic array receiving device in response, and comparing channel signals with each other to obtain amplitude and phase consistency errors; the self acceleration sensitivity and the acoustic sensitivity calibration data of the acoustic array are compared and converted, and the acoustic receiving amplitude and phase consistency errors can be deduced.
The underwater mine self-guide head is approximately rigidly connected with the vibration table, the vibration table vibrates integrally, applied excitation signals are in a single same direction, the transducers of all array elements in the acoustic array sense that the vibration signals are consistent, introduction of non-consistency errors of a multi-loudspeaker array in a conventional air measurement method is avoided, and improvement of measurement precision of sensitivity amplitude and phase consistency errors of all channels is facilitated.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A device for testing an acoustic receiving system of a mine self-guide head in the air is characterized by comprising: the underwater mine self-guide device comprises a vibration table (1), a mine self-guide head, a clamp (4) and a signal source;
the mine self-guide head (2) is arranged on the vibration table (1), and the foam alloy is arranged between the mine self-guide head and the vibration table;
the mine self-guide head is fastened on the vibration table (1) by the clamp (4);
the resonance frequency of a mechanical structure formed by the vibration table (1), the mine self-guide head and the clamp (4) is higher than the working frequency band of the mine self-guide head;
the signal source is used for generating an analog self-conductance signal and driving the vibration table (1) to vibrate.
2. The testing apparatus according to claim 1, wherein the mine self-guiding head comprises a self-guiding head acoustic receiving system (2) and a self-guiding head acoustic array (3);
the self-guide head acoustic array (3) is positioned on the self-guide head acoustic receiving system (2);
the self-guide head acoustic receiving system (2) is arranged on the vibration table (1), and the foam alloy is arranged between the self-guide head acoustic receiving system (2) and the vibration table (1);
the self-guide head acoustic array (3) generates a vibration response electric signal to the vibration, and the sensitivity amplitude and phase consistency of each channel of the underwater mine self-guide head acoustic receiving system (2) are obtained by utilizing the vibration response electric signal test.
3. A testing device according to claim 2, characterized in that the self-guided acoustic array (3) employs a longitudinal vibration complex rod transducer.
4. A test device as claimed in any one of claims 1 to 3, wherein the operating frequency of the vibration table (1) covers the operating frequency band of the mine self-guiding head.
5. The test device according to claim 2, wherein the underwater mine self-guide head acoustic receiving system (2) is provided with a signal conditioning circuit, and the signal conditioning circuit is used for amplifying, filtering and outputting the response electric signal;
and reading the output signal of the signal conditioning circuit by adopting an oscilloscope to obtain the sensitivity amplitude and phase consistency of each channel of the underwater mine self-guide head acoustic receiving system.
6. The method for testing the underwater mine self-guide head acoustic receiving system in the air is characterized in that the testing device provided by the claim 2, 3 or 4 is adopted to measure the sensitivity amplitude and phase consistency of each channel of the underwater mine self-guide head acoustic receiving system;
according to the metering calibration certificate of the self-guided head acoustic array (3), obtaining acoustic receiving sensitivity and vibration acceleration sensitivity data of each array element of the self-guided head acoustic array (3), and calculating a conversion proportion coefficient k between the acoustic receiving sensitivity and the vibration acceleration sensitivity;
the signal source generates an analog self-conductance signal to drive the vibration table (1) to vibrate;
the self-guide head acoustic array (3) responds to the vibration generated by the vibrating table (1) to generate a vibration response electric signal;
in the vibration response electric signal, the signals of all channels of the self-guide head acoustic array (3) are compared with each other to obtain vibration acceleration amplitude and phase consistency errors;
and calculating to obtain the sound receiving amplitude and phase consistency error according to the conversion scale coefficient k.
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| CN111174899B (en) | 2022-06-07 |
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