CN-121985249-A - All-directional modularized wind tunnel standard sound source

CN121985249ACN 121985249 ACN121985249 ACN 121985249ACN-121985249-A

Abstract

The application relates to the technical field of wind tunnel tests, in particular to an omni-directional modularized wind tunnel standard sound source. The omni-directional modularized wind tunnel standard sound source comprises a sound generating module, the sound generating module comprises at least two loudspeakers, at least two sound guide compression rings and an intermediate baffle, the at least two loudspeakers are arranged oppositely, the at least two loudspeakers are symmetrical along the axial direction of the sound generating module, the loudspeakers are used for outputting sound waves, the at least two sound guide compression rings are arranged at intervals, the at least two sound guide compression rings are symmetrically arranged between the at least two loudspeakers, the intermediate baffle is arranged in the middle of the at least two sound guide compression rings, one end of the sound guide compression rings is connected with the loudspeakers, the other end of the sound guide compression rings is spaced from the intermediate baffle, and the sound guide compression rings and the intermediate baffle can form a guide sound cavity to transmit the sound waves output by the loudspeakers. In this way, the propagation path of the sound wave is optimized, internal reflection is reduced, and the sound wave can be uniformly and stably distributed in the circumferential direction and the polar angle direction so as to realize the far-field omni-directional sound field.

Inventors

ZHANG WEIGUANG
DU LIN
Zou Jiaju
FAN ZIHAO
WANG ZHUO
QIU XIANGHAI

Assignees

北京航空航天大学

Dates

Publication Date: 20260505
Application Date: 20260108

Claims (10)

1. The utility model provides an all-directional modularization wind tunnel standard sound source which characterized in that includes sound production module, sound production module includes: the sound generating module comprises at least two loudspeakers, at least two sound generating modules and a sound generating module, wherein the at least two loudspeakers are oppositely arranged and are symmetrical along the axial direction of the sound generating module, and the loudspeakers are used for outputting sound waves; the at least two sound guide compression rings are arranged at intervals, and the at least two sound guide compression rings are symmetrically arranged between the at least two loudspeakers; The middle partition plate is arranged in the middle of at least two sound guide compression rings, one end of each sound guide compression ring is connected with the loudspeaker, and the other end of each sound guide compression ring is spaced from the middle partition plate; the sound guide compression ring and the middle partition plate can form a guide sound cavity to transmit sound waves output by the loudspeaker.
2. The omni-directional modular wind tunnel standard sound source according to claim 1, wherein the sound guiding ring comprises a straight line segment and an arc line segment, the straight line segment is connected with the arc line segment, and the arc line segment is closer to the middle partition plate than the straight line segment; The middle baffle plate comprises at least two curved surface sections which are symmetrically arranged, the center of each curved surface section protrudes out of the outer edge along the axial direction of the sound production module, the arc sections and the curved surface sections are arranged at intervals to form the guide sound cavity, sound waves can be transmitted into the guide sound cavity through the inside of the straight line sections, the guide sound cavity comprises a guide inlet and a guide outlet, one end, close to the straight line sections, of each arc section and the center of each curved surface section form the guide inlet, and the other end, close to the outer edge of each curved surface section, of each arc section is mutually close to form the guide outlet; The area of the guiding inlet is smaller than that of the guiding outlet so as to form the guiding acoustic cavity which is gradually expanded and gradually changed.
3. The omni-directional modular wind tunnel standard sound source according to claim 2, wherein the sound emitting module further comprises a perforated plate covering the pilot outlet, the pilot sound cavity being capable of transmitting sound waves to the perforated plate.
4. The omni-directional modular wind tunnel standard sound source according to claim 3, wherein the sound generating module further comprises a damping plate, the damping plate is sleeved outside the perforated plate, and the perforated plate can transmit sound waves to the damping plate and transmit the sound waves outwards through the damping plate.
5. The omni-directional modular wind tunnel standard sound source according to claim 1, wherein the sound generating module further comprises at least two connecting pieces, the at least two connecting pieces are arranged at intervals along the circumferential direction of the sound generating module, the connecting pieces are used for connecting the sound guiding compression ring and the middle partition plate in a combined manner, and the middle partition plate is fixed to the middle of the at least two sound guiding compression rings through the connecting pieces.
6. The omni-directional modular wind tunnel standard sound source according to claim 5, wherein the sound generating module further comprises at least two supports and damping plates, at least two of the supports are symmetrically arranged and arranged outside at least two of the speakers, the connecting piece can fix the speakers to the supports through the sound guiding compression ring, and the outer surfaces of the supports along the radial direction of the sound generating module are flush with the outer surfaces of the damping plates along the radial direction of the sound generating module, so that the outer surfaces of the sound generating module are flush.
7. The omni-directional modular wind tunnel standard sound source according to claim 1, further comprising a shell module, wherein the shell module is connected with the sounding module, the shell module comprises a front cover body and a rear cover body, the front cover body and the rear cover body are respectively arranged at two ends of the sounding module along the axial direction of the sounding module, and the outer contours of the front cover body and the rear cover body are both in a minimum resistance revolving body structure or a laminar flow wing type structure along the section of the sounding module in the axial direction.
8. The omni-directional modular wind tunnel standard sound source according to claim 7, wherein the front cover body is internally provided with a front cover body inner cavity, the rear cover body is internally provided with a rear cover body inner cavity, the front cover body inner cavity and the rear cover body inner cavity are symmetrically arranged at two ends of the sound generating module, and the front cover body inner cavity and the rear cover body inner cavity are empty or are filled with sound absorbing materials.
9. The omni-directional modular wind tunnel standard sound source according to claim 7, wherein the housing module further comprises a tail support rod connected to the rear housing, the tail support rod for securing the omni-directional modular wind tunnel standard sound source into a pneumatic acoustic wind tunnel.
10. The omni-directional modular wind tunnel standard sound source according to claim 1, wherein the omni-directional modular wind tunnel standard sound source comprises at least two sound emitting modules, and at least two sound emitting modules are connected in series along an axial direction of the sound emitting modules.

Description

All-directional modularized wind tunnel standard sound source Technical Field The application relates to the technical field of wind tunnel tests, in particular to an omni-directional modularized wind tunnel standard sound source. Background When acoustic test research is carried out in a pneumatic acoustic wind tunnel, factors such as acoustic scattering, wall reflection and reverberation of a wind tunnel shear layer, a model and an acquisition equipment bracket can interfere with the accuracy of data. Thus, testing needs to be performed with the aid of a standard sound source to optimize the test scheme and provide a basis for correction for the data. On the one hand, the requirements of a standard sound source can form a high-precision omni-directional spherical sound field (covering a polar angle range of +/-60 degrees), and on the other hand, the requirements of sounding power with certain sound intensity are met so as to simulate various test signals such as pure tone, broadband, pulse and the like. At present, a polyhedral sound source and a medium-high frequency conduit type volume sound source which are commonly used in building acoustics cannot be used in a flowing scene, and in a special sound source of a wind tunnel, a loudspeaker sound source can be installed close to a wall to realize broadband or pure sound noise but poor directivity, a laser-induced plasma sound source is used for medium-high frequency sound field test but has a complex structure and high cost, and a micro jet flow sound source is used for generating a broadband signal but needs to provide an additional air source. In order to reduce the influence of air flow, the prior art optimizes the standard sound sources of the loudspeaker class in the wind tunnel, but still has obvious defects. For example, when the cylindrical shape of the standard sound source is perpendicular to the incoming flow direction and the sound transmission part is not specially treated, falling vortex and cavity noise are easily generated under the flowing condition, and the sound field propagation is disturbed. For another example, when a standard sound source adopts a streamline housing but is not optimized for omni-directivity, the housing itself may generate scattering to increase directivity error, and it is difficult to form an ideal spherical sound field. For another example, when the circumferential directivity of the sound source cylindrical section is optimized only, the directivity in the polar angle direction along the flow direction is not excellent, and the influence of the speaker back chamber on the directivity is ignored, and in addition, the scheme of the high-low frequency division combination of the speaker is insufficient in practical application, which results in deterioration of the far-field directivity. Accordingly, in view of such a situation, it is desirable to provide an omni-directional modular wind tunnel standard sound source to at least partially address the problems presented therein. Disclosure of Invention A series of concepts in simplified form are introduced in the application content section, which will be described in further detail in the detailed description section. The application of the present application is not intended to limit the key features and essential features of the claimed technical solution, but is not intended to limit the scope of the claimed technical solution. The application provides an omni-directional modularized wind tunnel standard sound source, which comprises a sound generating module, wherein the sound generating module comprises: the sound generating module comprises at least two loudspeakers, at least two sound generating modules and a sound generating module, wherein the at least two loudspeakers are oppositely arranged and are symmetrical along the axial direction of the sound generating module, and the loudspeakers are used for outputting sound waves; the at least two sound guide compression rings are arranged at intervals, and the at least two sound guide compression rings are symmetrically arranged between the at least two loudspeakers; The middle partition plate is arranged in the middle of at least two sound guide compression rings, one end of each sound guide compression ring is connected with the loudspeaker, and the other end of each sound guide compression ring is spaced from the middle partition plate; the sound guide compression ring and the middle partition plate can form a guide sound cavity to transmit sound waves output by the loudspeaker. The omni-directional modularized wind tunnel standard sound source comprises a sound generating module, wherein the sound generating module comprises at least two loudspeakers, at least two sound guide compression rings and an intermediate baffle, the at least two loudspeakers are arranged oppositely, the at least two loudspeakers are symmetrical along the axial direction of the sound generating module, the loudspeakers are used for