CN114088197B - Low-noise air flow internal noise measuring device - Google Patents
Low-noise air flow internal noise measuring device Download PDFInfo
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- CN114088197B CN114088197B CN202111373965.1A CN202111373965A CN114088197B CN 114088197 B CN114088197 B CN 114088197B CN 202111373965 A CN202111373965 A CN 202111373965A CN 114088197 B CN114088197 B CN 114088197B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention discloses a low-noise air flow internal noise measuring device which comprises a sound-transmitting fairing, a switching section, a supporting rod, a nylon clamp, a fastening cone head and a microphone, wherein the diameters of the sound-transmitting fairing, the switching section and the supporting rod are the same, the sound-transmitting fairing, the switching section and the supporting rod are sequentially connected through threads, the rod part of the microphone passes through the fastening cone head and the nylon clamp, the fastening cone head and the nylon clamp fasten the microphone through threaded fit, the acquisition head of the microphone is positioned in the sound-transmitting fairing, the fastening cone head is positioned in the switching section, the nylon clamp is positioned in the front end of the supporting rod and is connected with the supporting rod through threads, and a signal wire of the microphone is led out through a hollow channel connected with the supporting rod. The device has good aerodynamic appearance and lower aerodynamic load, can reduce the interference to a flow field, avoids generating extra aerodynamic noise, and is convenient for arrangement in high-speed airflow; has the advantages of convenient and stable installation, insulation and the like.
Description
Technical Field
The invention belongs to the technical field of noise measurement, and relates to a low-noise air flow internal noise measuring device.
Background
When rotor wing aerodynamic noise test is carried out in an acoustic wind tunnel, noise near the rotor wing and the helicopter body needs to be measured in high-speed airflow, and the near-field distribution of the rotor wing noise is obtained. When the microphone is arranged in the high-speed airflow to measure noise, the microphone can be impacted by the high-speed airflow to generate serious wind noise, and noise generated by sound sources such as a rotor wing is covered, so that the signal-to-noise ratio of noise test is too low, and the quality of test data is affected. The conventional method for reducing the influence of wind noise mainly comprises a wind ball and a nose cone, but the wind speed range suitable for the two devices is low and is generally not more than 30m/s, and the requirements of wind tunnel tests under high wind speed are difficult to meet.
Disclosure of Invention
Based on the defects, the invention aims to provide the low-noise air flow internal noise measuring device, so that the purpose of testing noise in high-speed air flow of an acoustic wind tunnel is realized, and the accuracy of noise measurement is improved.
The technical scheme of the invention is as follows: the utility model provides a noise measuring device in low noise air current, includes sound-transmitting radome fairing, changeover portion, branch, nylon clamp, fastening cone head and microphone, sound-transmitting radome fairing, changeover portion and the diameter of branch the same, sound-transmitting radome fairing, changeover portion and branch loop through threaded connection, the pole portion of microphone passes fastening cone head and nylon clamp, fastening cone head and nylon clamp tighten the microphone through screw-thread fit, the collection head of microphone is located sound-transmitting radome fairing, fastening cone head is located changeover portion, nylon clamp is located the front end inside of branch to be connected with branch through the screw thread, the signal line of microphone is drawn forth through the hollow channel of connection branch.
Further, the sound-transmitting fairing is filled with windproof sponge.
Furthermore, the sound-transmitting fairing is provided with sound-transmitting holes, the diameter of the sound-transmitting holes is 2mm, and the aperture ratio is 30%.
Further, the front end of the nylon clamp is provided with 4 claws which are used for being matched with the fastening cone to clamp the rod part of the microphone.
The invention has the following advantages and beneficial effects: the device has good aerodynamic appearance and lower aerodynamic load, can reduce the interference to a flow field, avoids generating extra aerodynamic noise, has small aerodynamic force and is convenient for arrangement in high-speed airflow; secondly, the front part of the measuring device is filled with an acoustic-transmitting fairing and an acoustic-transmitting sponge in the acoustic-transmitting fairing, so that high-speed airflow is separated, an impact microphone is avoided, acoustic waves of a tested object are allowed to be transmitted in, the signal-to-noise ratio of noise test in the high-speed airflow is improved, and the test of the noise of a test object in the high-speed airflow is realized; has the advantages of convenient and stable installation, insulation and the like. The testing device can be used for testing near-field distribution such as rotor noise, propeller noise, jet noise and the like in high-speed airflow of an acoustic wind tunnel, and improves the accuracy of noise testing under the condition of high-speed airflow.
Drawings
FIG. 1 is a block diagram of a low noise flow internal noise measurement device according to the present invention;
the device comprises a 1-sound-transmitting fairing, a 2-windproof sponge, a 3-switching section, a 4-supporting rod, a 5-nylon clamp, a 6-fastening cone head and a 7-microphone.
Detailed Description
The invention is further illustrated by way of example with reference to the accompanying drawings:
example 1
The utility model provides a noise measuring device in low noise air current, includes sound-transmitting radome fairing, changeover portion, branch, nylon clamp, fastening cone head, microphone, sound-transmitting radome fairing, changeover portion and the diameter of branch the same, sound-transmitting radome fairing, changeover portion and branch loop through threaded connection, the pole portion of microphone passes fastening cone head and nylon clamp, fastening cone head and nylon clamp tighten the microphone through screw-thread fit, the collection head of microphone is located sound-transmitting radome fairing, fastening cone head is located changeover portion, the nylon clamp is located the front end inside of branch to be connected with branch through the screw thread, the signal line of microphone is drawn forth through the hollow channel of connection branch. The sound-transmitting fairing is filled with windproof sponge. The sound-transmitting fairing is provided with sound-transmitting holes, the diameter of each sound-transmitting hole is 2mm, and the aperture ratio is 30%. The front end of the nylon clamp is provided with 4 claws which are used for being matched with the fastening cone to clamp the rod part of the microphone. The air flow is separated by adopting the sound-transmitting fairing with good aerodynamic appearance, so that aerodynamic force born by the measuring device is reduced, and meanwhile, the interference to a flow field is reduced, and the generation of extra interference noise is avoided; the sound-transmitting fairing adopts a sound-transmitting structure, sound-transmitting holes are formed in the surface, the diameter of each hole is 2mm, the aperture ratio is 30%, noise transmission is allowed while high-speed airflow impact is reduced, and noise test is not affected. The support rod adopts a hollow structure, and a signal wire of the microphone is led out through a hollow channel connected with the support rod and then connected with the data acquisition system. The tail end of the supporting rod is provided with mounting threads so as to be mounted on the air flow inner test supporting frame. The nylon clamp is used for installing the microphone and plays an insulating role. The nylon clip is also hollow, allowing the microphone and signal cable to pass through, and uses the front 4 jaws to grip the microphone. The nylon clamp is connected to the supporting rod through threads. The fastening cone head is matched with the nylon clamp through threads, when the threads are screwed, the fastening cone head presses the small claw at the front end of the nylon clamp to clamp the microphone, and the microphone is prevented from loosening.
Example 2
The support rod 4 is a main bearing component of the measuring device, the rear end of the support rod 4 is connected with an air flow inner measuring bracket and the like through threads, the front end of the support rod is connected with the switching section 3 through threads, and the inside of the support rod is connected with the nylon clamp 5 through threads. The inside of the supporting rod 4 is provided with a wiring hole which allows the microphone signal cable to pass through. The aerodynamic force applied to the whole measuring device during the test is borne by the supporting rod 4 and is transmitted to the measuring bracket in the air flow. The sound-transmitting fairing 1 is manufactured through numerical control machining or 3D printing, and meets the requirements of the diameter and the aperture ratio of the sound-transmitting holes while ensuring the aerodynamic shape, so that the sound waves can be transmitted in. The sound-transmitting sponge 2 is made of a conventional wind-proof ball material, and can further reduce the influence of low-speed air flow entering from sound-transmitting holes in the sound-transmitting fairing 1, and simultaneously allow sound waves to be transmitted and spread onto the membrane of the microphone 7. The switching section 3 is used for connecting the sound-transmitting fairing and the supporting rod and improving the installation efficiency of the microphone. The nylon clamp 5 is arranged on the supporting rod through threads and is used for insulating and mounting the microphone 7 and allowing a signal cable to pass through; the screw thread has been arranged to nylon clamp 5's surface equally, and fastening conical head 6 can screw in this screw thread to oppress the little claw of nylon clamp 5 front end, realize the fastening of microphone 7, ensure that microphone 7 can not take place not hard up in the test process. The measuring device has a maximum diameter of 30mm and an overall length of 220mm. Wherein the sound-transmitting fairing is a screwed structure with the maximum diameter of 30 mm.
Claims (1)
1. The utility model provides a noise measuring device in low noise air current, includes sound-transmitting radome fairing, changeover portion, branch, nylon clamp, fastening cone head, microphone, its characterized in that: the diameter of the sound-transmitting fairing, the diameter of the switching section and the diameter of the supporting rod are the same, the sound-transmitting fairing, the diameter of the switching section and the diameter of the supporting rod are sequentially connected through threads, the rod part of the microphone penetrates through the fastening cone head and the nylon clamp, the fastening cone head and the nylon clamp tightly clamp the microphone through threaded fit, the acquisition head of the microphone is positioned in the sound-transmitting fairing, the fastening cone head is positioned in the switching section, the nylon clamp is positioned in the front end of the supporting rod and is connected with the supporting rod through threads, and a signal wire of the microphone is led out through a hollow channel connected with the supporting rod; the sound-transmitting fairing is filled with sound-transmitting sponge; the sound-transmitting fairing is provided with sound-transmitting holes, the diameter of each sound-transmitting hole is 2mm, and the aperture ratio is 30%; the front end of the nylon clamp is provided with 4 claws which are used for being matched with the fastening cone to clamp the rod part of the microphone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111373965.1A CN114088197B (en) | 2021-11-19 | 2021-11-19 | Low-noise air flow internal noise measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111373965.1A CN114088197B (en) | 2021-11-19 | 2021-11-19 | Low-noise air flow internal noise measuring device |
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| Publication Number | Publication Date |
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| CN114088197A CN114088197A (en) | 2022-02-25 |
| CN114088197B true CN114088197B (en) | 2023-07-14 |
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| CN202111373965.1A Active CN114088197B (en) | 2021-11-19 | 2021-11-19 | Low-noise air flow internal noise measuring device |
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Citations (7)
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| US5861585A (en) * | 1997-09-30 | 1999-01-19 | Aiolos Engineering Corporation | Aeracoustic wind tunnel turning vanes |
| CN201666815U (en) * | 2009-10-23 | 2010-12-08 | 江苏省交通科学研究院股份有限公司 | Integrated test system for automobile noise |
| CN108544671A (en) * | 2018-05-10 | 2018-09-18 | 南安市创培电子科技有限公司 | A kind of wall perforating device |
| CN209199593U (en) * | 2018-12-06 | 2019-08-02 | 中国电子科技集团公司第三研究所 | A kind of device reducing seashore microphone wind noise |
| CN110793624A (en) * | 2019-12-09 | 2020-02-14 | 中国航空工业集团公司哈尔滨空气动力研究所 | Sound source calibrating device used in high-speed airflow |
| CN111351568A (en) * | 2020-04-20 | 2020-06-30 | 深圳中雅机电实业有限公司 | Measurer for measuring sound transmission quantity of air pipe |
| CN112985749A (en) * | 2021-05-12 | 2021-06-18 | 中国航空工业集团公司沈阳空气动力研究所 | Cavity noise suppression wind tunnel test device based on sound absorption material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1753656B1 (en) * | 2004-03-29 | 2013-05-08 | Goodrich Corporation | Landing gear noise attenuation |
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2021
- 2021-11-19 CN CN202111373965.1A patent/CN114088197B/en active Active
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|---|---|---|---|---|
| US5861585A (en) * | 1997-09-30 | 1999-01-19 | Aiolos Engineering Corporation | Aeracoustic wind tunnel turning vanes |
| CN201666815U (en) * | 2009-10-23 | 2010-12-08 | 江苏省交通科学研究院股份有限公司 | Integrated test system for automobile noise |
| CN108544671A (en) * | 2018-05-10 | 2018-09-18 | 南安市创培电子科技有限公司 | A kind of wall perforating device |
| CN209199593U (en) * | 2018-12-06 | 2019-08-02 | 中国电子科技集团公司第三研究所 | A kind of device reducing seashore microphone wind noise |
| CN110793624A (en) * | 2019-12-09 | 2020-02-14 | 中国航空工业集团公司哈尔滨空气动力研究所 | Sound source calibrating device used in high-speed airflow |
| CN111351568A (en) * | 2020-04-20 | 2020-06-30 | 深圳中雅机电实业有限公司 | Measurer for measuring sound transmission quantity of air pipe |
| CN112985749A (en) * | 2021-05-12 | 2021-06-18 | 中国航空工业集团公司沈阳空气动力研究所 | Cavity noise suppression wind tunnel test device based on sound absorption material |
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| Title |
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| 声学风洞内气动噪声源识别定位方法研究;王勋年等;《空气动力学学报》;第30卷(第3期);第284-290页 * |
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| CN114088197A (en) | 2022-02-25 |
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