CN112903824B - Double-sound-source standing wave tube acoustic testing system - Google Patents
Double-sound-source standing wave tube acoustic testing system Download PDFInfo
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- CN112903824B CN112903824B CN202110047712.9A CN202110047712A CN112903824B CN 112903824 B CN112903824 B CN 112903824B CN 202110047712 A CN202110047712 A CN 202110047712A CN 112903824 B CN112903824 B CN 112903824B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/26—Arrangements for orientation or scanning by relative movement of the head and the sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/11—Analysing solids by measuring attenuation of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/015—Attenuation, scattering
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
Abstract
The invention relates to a double-sound-source standing wave tube acoustic testing system. The system comprises a pressure-resistant pipe section, a normal-pressure pipe section, a test piece mounting pipe section, a test piece clamp, a vacuum pump, a multi-channel input and output module, two groups of microphones and two sound sources; one end of the pressure-resistant pipe section is provided with a sound source; one end of the normal pressure pipe section is provided with another sound source; the test piece mounting pipe section is connected between the pressure-resistant pipe section and the normal-pressure pipe section; the test piece clamp is arranged in the test piece mounting pipe section and used for fixing the test piece; the vacuum pump is connected to the pressure-resistant pipe section and is used for forming negative pressure in the pressure-resistant pipe section; the multichannel input and output module is used for acquiring signals of the two groups of microphones and controlling input signals of the two sound sources; the two groups of microphones are used for respectively acquiring sound pressure in the pressure-resistant pipe section and sound pressure in the normal-pressure pipe section. According to the technical scheme, the invention can achieve the following beneficial technical effects: the test of the sound insulation quantity and the sound absorption coefficient of the medium-low frequency bidirectional normal incidence can be carried out aiming at the internal and external pressure difference environment of the small sample piece under the simulated cruising state.
Description
Technical Field
The invention relates to the technical field of aviation, in particular to an acoustic test system for a standing wave tube by a double-sound-source method.
Background
For testing the material and the structural acoustic characteristics of the small sample piece, a common method is an impedance tube method, in order to ensure the testing precision, the impedance tube method requires that a sound-absorbing wedge or a sound-absorbing load with high sound-absorbing performance must be arranged at the tail end of the pipeline, and the sound-absorbing coefficient is required to be more than 0.99. Good sound absorption ends are generally achieved in practice by using long exhaust pipes, high-absorption materials or trumpet-shaped pipes. However, it is difficult to completely eliminate sound in any sound-absorbing end established by any method, and especially under the excitation of lower-frequency sound waves, the sound-absorbing coefficient of the sound-absorbing end often does not meet the required requirement. In addition, the acoustic performance of the aeronautical structure is influenced by the pressure difference in the cruising state, the sound insulation performance of the aeronautical structure is different from that of the aeronautical structure in the ground state, and the influence of the sound insulation performance caused by the pressure difference needs to be considered in the acoustic design of the aeronautical structure. The current impedance tube method test does not consider the pressure difference environment and can not simulate the cruise pressure difference state.
Disclosure of Invention
The invention aims to provide a double-sound-source standing wave tube acoustic testing system which can solve the problems in the prior art and can test the sound insulation quantity and the sound absorption coefficient of the medium-low frequency bidirectional normal incidence aiming at the internal and external pressure difference environment of a small sample piece in a simulated cruise state.
The above objects of the invention are achieved by a double-sound-source standing wave tube acoustic test system, which comprises a pressure-resistant pipe section, a normal-pressure pipe section, a test piece mounting pipe section, a test piece clamp, a vacuum pump, a multi-channel input and output module, two groups of microphones and two sound sources;
one end of the pressure-resistant pipe section is provided with one of the two sound sources, the other end of the pressure-resistant pipe section is connected to the test piece mounting pipe section, and the pressure-resistant pipe section is provided with a microphone mounting hole;
one end of the normal pressure pipe section is provided with the other sound source of the two sound sources, the other end of the normal pressure pipe section is connected to the test piece mounting pipe section, and a microphone mounting hole is formed in the normal pressure pipe section;
the test piece mounting pipe section is connected between the pressure-resistant pipe section and the normal-pressure pipe section;
the test piece fixture is arranged in the test piece mounting pipe section and used for fixing a test piece;
the vacuum pump is connected to the pressure-resistant pipe section and is used for forming negative pressure in the pressure-resistant pipe section;
the multichannel input and output module is used for collecting signals of the two groups of microphones and controlling input signals of the two sound sources, the multichannel input and output module comprises a signal input end and two signal output ends, the signal input end of the multichannel input and output module is connected with the output ends of the two groups of microphones, and the two signal output ends of the multichannel input and output module are respectively connected with the input ends of the two sound sources;
the two groups of microphones are respectively arranged in microphone mounting holes in the pressure-resistant pipe section and microphone mounting holes in the normal-pressure pipe section and are used for respectively acquiring sound pressure in the pressure-resistant pipe section and sound pressure in the normal-pressure pipe section.
According to the technical scheme, the acoustic test system of the standing wave tube with the double-sound-source method can achieve the following beneficial technical effects: the test of the sound insulation quantity and the sound absorption coefficient of the medium-low frequency bidirectional normal incidence can be carried out aiming at the internal and external pressure difference environment of the small sample piece under the simulated cruising state.
Specifically, on one hand, a stable differential pressure environment is established on two sides of the test piece, so that the environmental condition under the cruising state can be effectively simulated, an effective plane wave sound field is formed in the pipeline, and the normal incidence sound insulation quantity and the sound absorption coefficient in the middle and low frequency range are tested; on the other hand, the normal incidence sound insulation quantity and the sound absorption coefficient of the test piece in two directions can be tested simultaneously by double-sound-source excitation.
Preferably, the cross section of the pressure-resistant pipe section is square, the cross section of the normal-pressure pipe section is square, and the cross-sectional dimension d is determined according to the upper limit f of the test frequency max Determining that the requirements are met: d is less than or equal to c/(2 f) max ) Wherein c is the speed of sound.
According to the technical scheme, the acoustic test system of the standing wave tube by the double-sound-source method can achieve the following beneficial technical effects: through the preferable sectional shape and sectional dimension of the pressure-resistant pipe section/normal-pressure pipe section, the test of the medium-low frequency bidirectional normal incidence sound insulation quantity and the sound absorption coefficient can be better carried out.
Preferably, the dual-source standing wave tube acoustic testing system further comprises a pressure control module, wherein the pressure control module is connected to the vacuum pump and is used for adjusting the gas pressure in the pressure-resistant pipe section to a set range.
According to the technical scheme, the acoustic test system of the standing wave tube by the double-sound-source method can achieve the following beneficial technical effects: the test device can effectively simulate the internal and external pressure difference environment in a cruising state and test the sound insulation quantity and the sound absorption coefficient of the medium-low frequency bidirectional normal incidence.
Preferably, the pressure control module is configured to achieve a pressure differential of 0-8 psi across the test piece.
According to the technical scheme, the acoustic test system of the standing wave tube by the double-sound-source method can achieve the following beneficial technical effects: the test method can effectively simulate the internal and external pressure difference environment in the cruising state and test the sound insulation quantity and the sound absorption coefficient of the medium and low frequency bidirectional normal incidence.
Preferably, the acoustic test system for the standing wave tube by the dual-sound-source method further comprises a microphone dummy head, the shape of the microphone dummy head is the same as that of the microphone but does not have a sound transmission function, and the microphone dummy head is used for plugging hole positions, where no microphone is installed, in the pressure-resistant tube section and the normal-pressure tube section.
According to the technical scheme, the acoustic test system of the standing wave tube by the double-sound-source method can achieve the following beneficial technical effects: the hole sites of the pressure-resistant pipe section and the normal-pressure pipe section, on which the microphones are not installed, can be effectively plugged, and the air tightness of the pipe sections is ensured, so that the normal test of the medium-low frequency bidirectional normal incidence sound insulation quantity and the sound absorption coefficient is ensured to be normally carried out.
Preferably, the pressure-resistant pipe section is provided with at least three microphone mounting holes.
According to the technical scheme, the acoustic test system of the standing wave tube by the double-sound-source method can achieve the following beneficial technical effects: the test precision is improved, and the test of the medium and low frequency bidirectional normal incidence sound insulation quantity and the sound absorption coefficient is better performed.
Preferably, the normal pressure pipe section and the pressure resistant pipe section are made of the same material and have the same structure.
According to the technical scheme, the acoustic test system of the standing wave tube by the double-sound-source method can achieve the following beneficial technical effects: the method improves the component universality of the acoustic testing system, reduces the testing cost and optimizes the testing environment.
Preferably, a slide way is arranged in the test piece mounting pipe section and is used for enabling the test piece clamp to freely slide in the test piece mounting pipe section, and the inner cross section of the test piece mounting pipe section is matched with the outer cross section of the test piece clamp.
According to the technical scheme, the acoustic test system of the standing wave tube with the double-sound-source method can achieve the following beneficial technical effects: the test piece can be fixed at a proper position in the test piece mounting pipe section, and deflection and other phenomena cannot occur in the sliding process.
Preferably, the specimen holder includes a plurality of slide rail frames of different thicknesses.
According to the technical scheme, the acoustic test system of the standing wave tube by the double-sound-source method can achieve the following beneficial technical effects: the test piece can be installed on the slide rail frame of difference according to thickness size, the quick dismantlement of being convenient for.
Preferably, the inner cross-sectional dimension of the slide rail frame is identical to the inner cross-sectional dimension of the pressure pipe section and the atmospheric pipe section.
According to the technical scheme, the acoustic test system of the standing wave tube by the double-sound-source method can achieve the following beneficial technical effects: the test of the sound insulation quantity and the sound absorption coefficient of the medium and low frequency bidirectional normal incidence can be better carried out.
Drawings
Fig. 1 is a schematic diagram of a dual-source standing wave tube acoustic testing system according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a standing wave tube used in a dual-source standing wave tube acoustic testing system according to an embodiment of the present invention.
Fig. 3 is a cross-sectional view of a pressure-resistant pipe section or a normal-pressure pipe section adopted in a dual-sound-source standing wave tube acoustic testing system according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a test piece mounting tube section adopted in a dual-source standing wave tube acoustic testing system according to an embodiment of the present invention.
FIG. 5 is a cross-sectional view of a test piece mounting tube section for use in a dual source standing wave tube acoustic testing system, in accordance with an embodiment of the present invention.
FIG. 6 is a cross-sectional view of a test piece mounting tube section for use in a dual source standing wave tube acoustic testing system in accordance with an embodiment of the present invention.
FIG. 7 is a cross-sectional view of a specimen holder employed in a dual source standing wave tube acoustic testing system in accordance with an embodiment of the present invention.
Fig. 8 is a schematic diagram of test piece fixtures with different thicknesses used in a dual-source standing wave tube acoustic testing system according to an embodiment of the present invention.
List of reference numerals
1. A pressure-resistant pipe section;
2. a normal pressure pipe section;
3. installing a test piece on a pipe section;
4. a test piece clamp;
5. a vacuum pump;
6. a pressure control module;
7. a multi-channel input-output module;
8. a microphone;
9. a microphone dummy head;
10. a sound source.
Detailed Description
While specific embodiments of the invention will be described below, it should be noted that in the course of the detailed description of these embodiments, in order to provide a concise and concise description, all features of an actual implementation may not be described in detail. It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions are made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another. Moreover, it should be appreciated that such a development effort might be complex and tedious, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure, given the benefit of this disclosure, without departing from the scope of this disclosure.
Unless otherwise defined, technical or scientific terms used in the claims and the specification should have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and claims of the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The terms "a" or "an," and the like, do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalent, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, nor are they restricted to direct or indirect connections.
Fig. 1 is a schematic diagram of a dual-source standing wave tube acoustic testing system according to an embodiment of the present invention. Fig. 2 is a schematic diagram of a standing wave tube (including a pressure-resistant tube section, a normal-pressure tube section, and a test piece mounting tube section) used in a dual-sound-source standing wave tube acoustic testing system according to an embodiment of the present invention. Fig. 3 is a cross-sectional view of a pressure-resistant pipe section or a normal-pressure pipe section adopted in a dual-source standing wave tube acoustic testing system according to an embodiment of the present invention.
As shown in fig. 1-3, according to an embodiment of the present invention, a dual-sound-source standing wave tube acoustic testing system includes a pressure-resistant tube section 1, a normal-pressure tube section 2, a test piece installation tube section 3, a test piece fixture 4, a vacuum pump 5, a multi-channel input/output module 7, two sets of microphones 8, and two sound sources 10;
one end of the pressure-resistant pipe section 1 is provided with one sound source 10 of the two sound sources 10, the other end of the pressure-resistant pipe section 1 is connected to the test piece mounting pipe section 3, and the pressure-resistant pipe section 1 is provided with a microphone mounting hole;
one end of the normal pressure pipe section 2 is provided with the other sound source 10 of the two sound sources 10, the other end of the normal pressure pipe section 2 is connected to the test piece mounting pipe section 3, and the normal pressure pipe section 2 is provided with a microphone mounting hole;
the test piece mounting pipe section 3 is connected between the pressure-resistant pipe section 1 and the normal-pressure pipe section 2;
the test piece clamp 4 is arranged in the test piece mounting pipe section 3 and used for fixing a test piece;
a vacuum pump 5 is connected to the pressure-resistant pipe section 1 for creating negative pressure within the pressure-resistant pipe section 1;
the multichannel input and output module 7 is used for collecting signals of the two groups of microphones 8 and controlling input signals of the two sound sources 10, the multichannel input and output module 7 comprises a signal input end and two signal output ends, the signal input end of the multichannel input and output module 7 is connected with the output ends of the two groups of microphones 8, and the two signal output ends of the multichannel input and output module 7 are respectively connected with the input ends of the two sound sources 10, so that the two sound sources 10 work according to a set sound field in sequence;
the two groups of microphones 8 are respectively arranged in microphone mounting holes on the pressure-resistant pipe section 1 and microphone mounting holes on the normal-pressure pipe section 2 and are used for respectively collecting sound pressure in the pressure-resistant pipe section 1 and sound pressure in the normal-pressure pipe section 2.
According to the technical scheme, the acoustic test system of the standing wave tube by the double-sound-source method can achieve the following beneficial technical effects: the test of the sound insulation quantity and the sound absorption coefficient of the medium-low frequency bidirectional normal incidence can be carried out aiming at the internal and external pressure difference environment of the small sample piece under the simulated cruising state.
Specifically, on one hand, a stable differential pressure environment is established on two sides of the test piece, so that the environmental condition under the cruising state can be effectively simulated, an effective plane wave sound field is formed in the pipeline, and the normal incidence sound insulation quantity and the sound absorption coefficient in the medium and low frequency range are tested; on the other hand, the normal incidence sound insulation quantity and the sound absorption coefficient of the test piece in two directions can be tested simultaneously by double-sound-source excitation.
Preferably, as shown in fig. 1-3, the sound source 10 is a detachable sound source.
Preferably, the pressure pipe section 1 and/or the atmospheric pipe section 2 are made of a metallic material or a composite material.
Preferably, as shown in fig. 1 to 3, the connection between the pressure pipe section 1 and/or the atmospheric pipe section 2 and the specimen installation pipe section 3 is provided with a flange having a seal built therein.
Preferably, as shown in fig. 1-3, the pressure pipe section 1 and/or the atmospheric pipe section 2 have smooth and air-gap-free pipe walls, and the pipe sections can transmit plane waves below the cut-off frequency.
Preferably, as shown in FIGS. 1-3, the pressure pipe section 1 has a square cross-section, the atmospheric pipe section 2 has a square cross-section, and the cross-sectional dimension d is determined according to the upper limit f of the test frequency max Determining that the requirements are met: d is less than or equal to c/(2 f) max ) Wherein c is the speed of sound.
According to the technical scheme, the acoustic test system of the standing wave tube by the double-sound-source method can achieve the following beneficial technical effects: through the preferable sectional shape and sectional dimension of the pressure-resistant pipe section/normal-pressure pipe section, the test of the medium-low frequency bidirectional normal incidence sound insulation quantity and the sound absorption coefficient can be better carried out.
Of course, the square cross-sectional shape is merely the preferred cross-sectional shape of the tube segment used in the dual source standing wave tube acoustic testing system of the present application, and those skilled in the art will appreciate based on the present disclosure that other suitable cross-sectional shapes of tube segments (e.g., circular cross-sections) may be used without departing from the scope of the claims of the present application.
Preferably, as shown in fig. 1-3, the dual-source standing wave tube acoustic testing system further includes a pressure control module 6, and the pressure control module 6 is connected to the vacuum pump 5 for adjusting the gas pressure in the pressure-resistant pipe section 1 to a set range.
According to the technical scheme, the acoustic test system of the standing wave tube by the double-sound-source method can achieve the following beneficial technical effects: the test device can effectively simulate the internal and external pressure difference environment in the cruising state and test the sound insulation and the sound absorption coefficient of the medium and low frequency bidirectional normal incidence.
Preferably, as shown in FIGS. 1-3, the pressure control module 6 is configured to achieve a pressure differential of 0-8 psi across the test piece.
According to the technical scheme, the acoustic test system of the standing wave tube by the double-sound-source method can achieve the following beneficial technical effects: the test device can effectively simulate the internal and external pressure difference environment in the cruising state, test the sound insulation quantity and the sound absorption coefficient of the medium and low frequency bidirectional normal incidence, and the formed test environment meets the requirement of GB/T18696.2-2002.
Preferably, as shown in FIGS. 1-3, the pressure control module 6 is configured to control the differential pressure error across the test piece to + -0.1 psi.
Preferably, as shown in fig. 1-3, the dual-source standing wave tube acoustic testing system further includes a microphone dummy head 9, where the shape of the microphone dummy head 9 is the same as that of the microphone 8 but does not have a sound transmission function, and the microphone dummy head is used for plugging the hole sites where the microphone 8 is not installed in the pressure-resistant pipe section 1 and the normal-pressure pipe section 2.
According to the technical scheme, the acoustic test system of the standing wave tube with the double-sound-source method can achieve the following beneficial technical effects: the hole sites of the pressure-resistant pipe section and the normal-pressure pipe section, on which the microphones are not installed, can be effectively plugged, and the air tightness of the pipe sections is ensured, so that the normal test of the medium-low frequency bidirectional normal incidence sound insulation quantity and the sound absorption coefficient is ensured to be normally carried out.
Preferably, the radian of the end surface of the dummy head 9 of the microphone is consistent with the radian of the inner wall of the pipe section, and the pipe wall can be ensured to be smooth and have no air gap after being installed in an unused hole position.
Preferably, the pressure-resistant pipe section 1 is provided with at least three microphone mounting holes.
According to the technical scheme, the acoustic test system of the standing wave tube by the double-sound-source method can achieve the following beneficial technical effects: the test precision is improved, and the test of the medium and low frequency bidirectional normal incidence sound insulation quantity and the sound absorption coefficient is better performed.
Preferably, as shown in fig. 1 to 3, the pressure-resistant pipe section 1 is provided with four microphone mounting holes. Preferably, in order to improve the test accuracy, at least three microphone mounting holes with different intervals are respectively arranged on two sides of the test piece (namely, on the pressure pipe section 1 and the normal pressure pipe section 2), and different microphone positions can be selected according to the test frequency for testing. Preferably, at least three microphone mounting holes on the pressure pipe section 1 are provided with microphones 8, so as to avoid the need to disassemble and assemble the microphones 8 under different test conditions.
Preferably, as shown in fig. 1 to 3, the atmospheric pressure pipe section 2 and the pressure resistance pipe section 1 are made of the same material and have the same structure.
According to the technical scheme, the acoustic test system of the standing wave tube by the double-sound-source method can achieve the following beneficial technical effects: the method improves the component universality of the acoustic testing system, reduces the testing cost and optimizes the testing environment.
Fig. 4 is a schematic diagram of a test piece mounting tube section adopted in a dual-source standing wave tube acoustic testing system according to an embodiment of the present invention. FIG. 5 is a cross-sectional view of a test piece mounting tube section employed in a dual source standing wave tube acoustic testing system in accordance with an embodiment of the present invention. FIG. 6 is a cross-sectional view of a test piece mounting tube section for use in a dual source standing wave tube acoustic testing system in accordance with an embodiment of the present invention. FIG. 7 is a cross-sectional view of a specimen holder employed in a dual source standing wave tube acoustic testing system in accordance with an embodiment of the present invention. Fig. 8 is a schematic diagram of test piece fixtures with different thicknesses used in a dual-source standing wave tube acoustic testing system according to an embodiment of the present invention.
Preferably, as shown in fig. 4-8, a slide is provided in the test piece mounting tube section 3 for the test piece clamp 4 to slide freely in the test piece mounting tube section 3, and the inner cross section of the test piece mounting tube section 3 matches the outer cross section of the test piece clamp 4.
According to the technical scheme, the acoustic test system of the standing wave tube by the double-sound-source method can achieve the following beneficial technical effects: the test piece can be fixed at a proper position in the test piece mounting pipe section, and deflection and other phenomena cannot occur in the sliding process.
Preferably, the hard test piece can be clamped between the test piece clamps 4; soft test pieces such as foam, sponge and the like can be directly placed in the test piece clamp 4.
Preferably, as shown in fig. 4-8, the specimen holder 4 includes a plurality of slide rail frames of different thicknesses.
According to the technical scheme, the acoustic test system of the standing wave tube with the double-sound-source method can achieve the following beneficial technical effects: the test piece can be installed on the slide rail frame of difference according to the thickness size, and the quick dismantlement of being convenient for.
Preferably, the thickness dimension of the slide rail frame is a combination of 5mm, 10mm, 20mm and 50 mm.
Preferably, the inner cross-sectional dimension of the slide rail frame is identical to the inner cross-sectional dimension of the pressure pipe section 1 and the atmospheric pipe section 2.
According to the technical scheme, the acoustic test system of the standing wave tube by the double-sound-source method can achieve the following beneficial technical effects: the test of the sound insulation quantity and the sound absorption coefficient of the medium and low frequency bidirectional normal incidence can be better carried out.
While particular embodiments of the present invention have been described above, it will be understood by those skilled in the art that they are not intended to limit the invention, and that various modifications may be made by those skilled in the art based on the above disclosure without departing from the scope of the invention.
Claims (8)
1. The acoustic test system for the standing wave tube with the double sound source method is characterized by comprising a pressure-resistant tube section, a normal-pressure tube section, a test piece mounting tube section, a test piece clamp, a vacuum pump, a multi-channel input and output module, two groups of microphones and two sound sources;
one end of the pressure-resistant pipe section is provided with one of the two sound sources, the other end of the pressure-resistant pipe section is connected to the test piece mounting pipe section, and the pressure-resistant pipe section is provided with a microphone mounting hole;
one end of the normal pressure pipe section is provided with the other sound source of the two sound sources, the other end of the normal pressure pipe section is connected to the test piece mounting pipe section, and a microphone mounting hole is formed in the normal pressure pipe section;
the test piece mounting pipe section is connected between the pressure-resistant pipe section and the normal-pressure pipe section;
the test piece clamp is arranged in the test piece mounting pipe section and used for fixing a test piece;
the vacuum pump is connected to the pressure-resistant pipe section and is used for forming negative pressure in the pressure-resistant pipe section;
the multichannel input and output module is used for collecting signals of the two groups of microphones and controlling input signals of the two sound sources, the multichannel input and output module comprises a signal input end and two signal output ends, the signal input end of the multichannel input and output module is connected with the output ends of the two groups of microphones, and the two signal output ends of the multichannel input and output module are respectively connected with the input ends of the two sound sources;
the two groups of microphones are respectively arranged in microphone mounting holes on the pressure-resistant pipe section and microphone mounting holes on the normal-pressure pipe section and are used for respectively acquiring sound pressure in the pressure-resistant pipe section and sound pressure in the normal-pressure pipe section;
the pipe walls of the pressure-resistant pipe section and the normal-pressure pipe section are smooth and have no air gaps, the pipe sections can transmit plane waves below a cut-off frequency, the test piece clamp comprises a slide rail frame, and the size of the inner cross section of the slide rail frame is consistent with that of the pressure-resistant pipe section and the normal-pressure pipe section;
the section of the pressure-resistant pipe section is square, the section of the normal-pressure pipe section is square, and the section dimension d is determined according to the upper limit f of the test frequency max Determining that the requirements are met: d is less than or equal to c/(2 f) max ) Wherein c is the speed of sound.
2. The dual source standing wave tube acoustic testing system of claim 1, further comprising a pressure control module connected to the vacuum pump for regulating a gas pressure within the pressure resistant section to a set range.
3. The dual source standing wave tube acoustic testing system of claim 2, wherein the pressure control module is configured to achieve a pressure differential across the test piece of 0-8 psi.
4. The dual-source standing wave tube acoustic test system according to claim 1, wherein the dual-source standing wave tube acoustic test system further comprises a microphone dummy head, and the microphone dummy head has a shape the same as that of the microphone but does not have a sound transmission function, and is used for plugging hole sites of the pressure-resistant tube section and the normal-pressure tube section where the microphone is not installed.
5. The dual source standing wave tube acoustic testing system of claim 1, wherein at least three microphone mounting holes are provided on the pressure resistant tube section.
6. The acoustic test system of the double-sound-source standing wave tube according to claim 1, wherein the normal pressure tube section and the pressure resistant tube section are made of the same material and have the same structure.
7. The dual-sound-source standing wave tube acoustic testing system of claim 1, wherein a slide is provided in the test piece mounting tube section for the test piece clamp to freely slide in the test piece mounting tube section, and an inner cross section of the test piece mounting tube section is matched with an outer cross section of the test piece clamp.
8. The dual source standing wave tube acoustic testing system of claim 7, wherein the specimen holder comprises a plurality of slide rail frames of different thicknesses.
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