CN110763323A - Low-frequency noise measuring device based on sound wave total reflection - Google Patents
Low-frequency noise measuring device based on sound wave total reflection Download PDFInfo
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- CN110763323A CN110763323A CN201911020551.3A CN201911020551A CN110763323A CN 110763323 A CN110763323 A CN 110763323A CN 201911020551 A CN201911020551 A CN 201911020551A CN 110763323 A CN110763323 A CN 110763323A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H3/00—Measuring characteristics of vibrations by using a detector in a fluid
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Abstract
The invention belongs to the field of low-frequency noise measurement of underwater devices, and particularly relates to a low-frequency noise measuring device based on sound wave total reflection. In the invention, the internal part medium of the sound transmission pipe is water, the external part medium is air, when a noise test is carried out, noise generated by the propeller to be tested is transmitted to the inside of the extension pipe, when sound waves are transmitted to a water-air junction surface, the density of the air is far less than that of the water, the sound waves are totally reflected at the junction surface, and the reflected sound waves return to the water medium and continue to be transmitted forwards. Because the energy of the wave can not be changed by the total reflection, the directional propagation of the sound wave can be realized by the process, and the consistency of the sound wave collected by the hydrophone arranged at the end of the extension tube and the sound source is ensured. The invention increases the distance between the hydrophone and the sound source through the extension tube, does not change the characteristics of sound waves in the transmission process, and meets the requirement that the distance between the measuring device and the sound source is more than 1 wavelength, thereby being capable of measuring the low-frequency noise generated by the propeller.
Description
Technical Field
The invention belongs to the field of low-frequency noise measurement of underwater devices, and particularly relates to a low-frequency noise measuring device based on sound wave total reflection.
Background
With the rapid development of ships and ocean engineering, more and more requirements are put on the performance of modern ships, wherein the noise level of the ships is a problem which is always very concerned. For military ships, the level of noise directly affects the stealth performance of the ships and the fighting capacity of ships; for civil ships, the excessively high noise level affects the living environment of aquatic organisms in the air route, and the design concept of the modern ship is not in accordance with the green and environment-friendly concept. The propeller noise is a main source of ship noise, but in the actual measurement process, the low-frequency noise wavelength of the propeller is long, and the effective signal can be obtained only when the wavelength of the test equipment such as sonar is 1 time longer, so that the measurement of the low-frequency noise is difficult to realize due to the size of the existing circulating water drum. In order to realize low-frequency noise measurement, the method considers the total reflection principle of sound waves, so that the sound waves realize directional propagation in a certain direction, and the measured noise signals are real and effective.
Disclosure of Invention
The invention aims to provide a low-frequency noise measuring device based on sound wave total reflection, which can realize low-frequency noise measurement.
The purpose of the invention is realized by the following technical scheme: comprises a test section and an extension pipe; the left end and the right end of the test section are connected with a water circulation system; one end of the extension pipe is arranged on the side wall of the test section, and a sound transmission pipe is arranged inside the extension pipe; one end of the sound transmission tube is open, the other end of the sound transmission tube is closed, and the open end of the sound transmission tube is communicated with the interior of the test section; a hydrophone is arranged at the tail part of the closed end of the sound transmitting tube; the test section is internally provided with a propeller to be tested and a driving motor; the driving motor is connected with the propeller to be tested and is connected with an external control system through an external interface on the test section; the driving motor and the external interface are subjected to watertight treatment.
The present invention may further comprise:
the paddle part of the propeller to be tested is aligned with the extension pipe.
The invention has the beneficial effects that:
the invention considers the total reflection principle of the sound wave, realizes the directional propagation of the sound wave in a certain direction, and ensures that the measured noise signal is real and effective. In the invention, the internal medium of the sound transmission tube is water, the external medium of the sound transmission tube is air, and the hydrophone is arranged at the end of the sound transmission plate part. When a noise test is carried out, noise generated by the propeller to be tested is transmitted to the inside of the extension pipe, when sound waves are transmitted to a water-air junction surface, the density of air is far less than that of water, the sound waves are totally reflected at the junction surface, and the reflected sound waves return to a water medium and continue to be transmitted forwards. Because the energy of the wave can not be changed by the total reflection, the directional propagation of the sound wave can be realized by the process, and the consistency of the sound wave collected by the hydrophone arranged at the end of the extension tube and the sound source is ensured. The invention increases the distance between the hydrophone and the sound source through the extension tube, does not change the characteristics of sound waves in the transmission process, and meets the requirement that the distance between the measuring device and the sound source is more than 1 wavelength, thereby being capable of measuring the low-frequency noise generated by the propeller. Compared with the traditional noise measurement method, the device has the advantages of simple structure, small occupied space, low manufacturing cost and good measurement effect on low-frequency noise generated by the propeller.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
FIG. 2 is a longitudinal sectional view of an extension pipe according to the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, a low-frequency noise measuring device based on total reflection of sound waves comprises a test section 1 and an extension pipe 3; the left end and the right end of the test section are connected with the outer flow section 6, and the outer flow section is connected with an external water circulation system to provide stable inflow for the whole test device; one end of the extension pipe is arranged on the side wall of the test section, the sound transmission pipe 4 is arranged in the extension pipe, the interior of the extension pipe is divided into two parts by the sound transmission pipe, the inner side of the sound transmission pipe is filled with water, and the outer side of the sound transmission pipe is filled with air; one end of the sound transmission tube is open, the other end of the sound transmission tube is closed, and the open end of the sound transmission tube is communicated with the interior of the test section; a hydrophone 5 is arranged at the tail part of the closed end of the sound transmitting tube; the propeller 2 to be tested and the driving motor 7 are arranged in the test section, the position of the propeller to be tested is adjusted, the front section of the propeller to be tested is located at the same position as the extension pipe, and the blade part of the propeller to be tested is aligned with the extension pipe; the driving motor is connected with the propeller to be tested and is connected with an external control system through an external interface 8 on the test section; the driving motor and the external interface are subjected to watertight treatment, the driving motor subjected to watertight treatment is used for providing power for rotation of the propeller, and a control circuit of the driving motor is connected with an external operation table through the external interface 8.
As shown in fig. 2, the medium in the hatched portion is air, and the rest is water. The interior of the extension tube is divided into two parts by the sound transmission tube, the inner side of the sound transmission tube is filled with water, and the outer side of the sound transmission tube is filled with air.
When the sound wave passes through the sound transmission pipe in the extension pipe and is transmitted to a water-air junction surface, the sound wave is totally reflected at an interface because the density of air is far less than that of water, the reflected sound wave returns to a water medium and continuously propagates forwards, and is finally received by a hydrophone to obtain a noise signal. Compared with the traditional noise measurement method, the device has the advantages of simple structure, small occupied space and good measurement effect on low-frequency noise generated by the propeller.
Because the energy of the wave can not be changed by the total reflection, the directional propagation of the sound wave can be realized by the process, and the consistency of the sound wave collected by the hydrophone arranged at the end of the extension tube and the sound source is ensured. Since the transmission section of the acoustic wave is long enough, a low-frequency noise signal with a long wavelength can be measured.
The invention increases the distance between the hydrophone and the sound source through the extension tube, does not change the characteristics of sound waves in the transmission process, and meets the requirement that the distance between the measuring device and the sound source is more than 1 wavelength, thereby being capable of measuring the low-frequency noise generated by the propeller.
Compared with the traditional low-frequency noise measurement which needs to be carried out in a pool wide enough to avoid the scale effect of noise, the noise measurement device has the advantages of smaller occupied space and low manufacturing cost. The invention realizes the long-distance transmission of sound waves in a certain direction, and makes it possible to measure low-frequency noise signals with longer wavelength by using equipment such as hydrophones and the like.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. 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 (2)
1. The utility model provides a low frequency noise measuring device based on sound wave total reflection which characterized in that: comprises a test section and an extension pipe; the left end and the right end of the test section are connected with a water circulation system; one end of the extension pipe is arranged on the side wall of the test section, and a sound transmission pipe is arranged inside the extension pipe; one end of the sound transmission tube is open, the other end of the sound transmission tube is closed, and the open end of the sound transmission tube is communicated with the interior of the test section; a hydrophone is arranged at the tail part of the closed end of the sound transmitting tube; the test section is internally provided with a propeller to be tested and a driving motor; the driving motor is connected with the propeller to be tested and is connected with an external control system through an external interface on the test section; the driving motor and the external interface are subjected to watertight treatment.
2. The device for measuring low-frequency noise based on total reflection of sound waves according to claim 1, wherein: the paddle part of the propeller to be tested is aligned with the extension pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911020551.3A CN110763323A (en) | 2019-10-25 | 2019-10-25 | Low-frequency noise measuring device based on sound wave total reflection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911020551.3A CN110763323A (en) | 2019-10-25 | 2019-10-25 | Low-frequency noise measuring device based on sound wave total reflection |
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| CN110763323A true CN110763323A (en) | 2020-02-07 |
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| CN108844620A (en) * | 2018-06-25 | 2018-11-20 | 哈尔滨工程大学 | A kind of survey of gravity type propeller is made an uproar device |
| CN110615402A (en) * | 2018-06-19 | 2019-12-27 | 中国科学院声学研究所 | MEMS piezoelectric vector hydrophone with simply supported cantilever beam structure and preparation method thereof |
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2019
- 2019-10-25 CN CN201911020551.3A patent/CN110763323A/en active Pending
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH102835A (en) * | 1996-06-18 | 1998-01-06 | Tech Res & Dev Inst Of Japan Def Agency | Acoustic circulating water tank measuring device |
| JPH102832A (en) * | 1996-06-18 | 1998-01-06 | Tech Res & Dev Inst Of Japan Def Agency | Acoustic circulating water tank measuring device |
| CN101620004A (en) * | 2008-07-04 | 2010-01-06 | 中国科学院声学研究所 | Method for measuring direct wave signal sound pressure of sound wave transmitted in limited regional medium |
| CN102322935A (en) * | 2011-08-22 | 2012-01-18 | 江苏大学 | Flowing noise measuring device |
| CN102393245A (en) * | 2011-10-29 | 2012-03-28 | 中北大学 | Double-layer packaging type silicon micro noiseproof simulating vector hydrophone |
| CN202869636U (en) * | 2012-09-26 | 2013-04-10 | 中国船舶重工集团公司第七一〇研究所 | Vibration and self noise monitoring system of fuel-powered unmanned submersible vehicle |
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| CN203298861U (en) * | 2013-05-31 | 2013-11-20 | 江苏大学 | Hydraulic machinery operation monitoring device |
| CN104236693A (en) * | 2014-08-21 | 2014-12-24 | 中国船舶重工集团公司第七一五研究所 | Device and method for measuring ultrasonic power in half-noise-elimination water tank |
| CN106197945A (en) * | 2016-08-05 | 2016-12-07 | 中国船舶重工集团公司第七〇九研究所 | A kind of straight hair sound assay device of vast scale Propeller Model |
| CN106777542A (en) * | 2016-11-23 | 2017-05-31 | 大连理工大学 | Spring leaf propeller flow noise prediction method |
| CN106840354A (en) * | 2016-12-26 | 2017-06-13 | 中国船舶工业集团公司第七0八研究所 | A kind of noise-measuring system |
| CN110615402A (en) * | 2018-06-19 | 2019-12-27 | 中国科学院声学研究所 | MEMS piezoelectric vector hydrophone with simply supported cantilever beam structure and preparation method thereof |
| CN108844620A (en) * | 2018-06-25 | 2018-11-20 | 哈尔滨工程大学 | A kind of survey of gravity type propeller is made an uproar device |
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