CN210347550U - Insertion loss testing device - Google Patents
Insertion loss testing device Download PDFInfo
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- CN210347550U CN210347550U CN201921214935.4U CN201921214935U CN210347550U CN 210347550 U CN210347550 U CN 210347550U CN 201921214935 U CN201921214935 U CN 201921214935U CN 210347550 U CN210347550 U CN 210347550U
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- 238000012360 testing method Methods 0.000 title claims abstract description 107
- 238000003780 insertion Methods 0.000 title claims abstract description 27
- 230000037431 insertion Effects 0.000 title claims abstract description 27
- 238000011144 upstream manufacturing Methods 0.000 claims description 53
- 230000003014 reinforcing effect Effects 0.000 claims description 8
- 230000030279 gene silencing Effects 0.000 claims description 7
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 238000010276 construction Methods 0.000 claims 1
- 230000003584 silencer Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 4
- 238000012827 research and development Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
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Abstract
The utility model belongs to the technical field of the acoustics test, a insertion loss testing arrangement is disclosed, including the sound source device that connects gradually, the upper reaches section, test section and downstream section, upper reaches section and the coaxial setting of downstream section, the test section is used for installing the piece that awaits measuring, the sound wave that the sound source device sent can pass the upper reaches section in proper order, the piece that awaits measuring and the downstream section in the test section, be provided with the upper reaches test section in the upper reaches section, be provided with the low reaches test section in the downstream section, upper reaches test section and low reaches test section set up for the test section symmetry, the acoustics performance of piece that awaits measuring can be measured in the mutually supporting of upper reaches test section and low reaches test. The utility model provides a pair of insertion loss testing arrangement, simple structure, the cost is lower, can test the acoustic effect of piece that awaits measuring in different frequency bands, is fit for using in the research and development stage of silencer.
Description
Technical Field
The utility model relates to an acoustics tests technical field, especially relates to an insertion loss testing arrangement.
Background
The acoustic performance of the silencer can be represented and measured by insertion loss, the insertion loss is that a silencer is inserted between a noise source and a measuring point, and the sound pressure level difference between before and after the silencer is installed is measured at the measuring point.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an insertion loss testing arrangement is convenient for carry out the acoustics test to it at the research and development stage of silencer, and experimental apparatus's cost is moderate.
To achieve the purpose, the utility model adopts the following technical proposal:
the insertion loss testing device comprises a sound source device, an upstream section, a testing section and a downstream section which are sequentially connected, wherein the upstream section and the downstream section are coaxially arranged, the testing section is used for mounting a piece to be tested, and sound waves emitted by the sound source device can sequentially penetrate through the upstream section, the piece to be tested in the testing section and the downstream section;
the upstream section is provided with an upstream test section, the downstream section is provided with a downstream test section, the upstream test section with the downstream test section is relative to the test section symmetry setting, the upstream test section with the downstream test section can mutually cooperate and measure the acoustic performance of the piece that awaits measuring.
Preferably, the silencer further comprises a silencing end connected to the downstream section, and the test section and the silencing end are respectively located at two ends of the downstream section in the length direction.
Preferably, the sound attenuation end is of a straight pipe structure, and the size of the end face of the sound attenuation end is the same as that of the cross section of the downstream section.
Preferably, the sound absorption material is filled in the sound attenuation tail end, and the length of the sound attenuation tail end is 1/4-1/2 of the wavelength corresponding to the cut-off frequency of the sound wave emitted by the sound source device.
Preferably, the test section comprises a box body and a box cover, and the box cover is detachably connected with the box body.
Preferably, the case cover is provided with a handle.
Preferably, the box body is provided with a reinforcing structure, and the reinforcing structure extends along the height direction of the box body.
Preferably, a first boss is arranged at the joint of the box body and the upstream section, and when the upstream section is connected with the test section, the first boss surrounds the periphery of the upstream section;
the junction of box with the downstream section is provided with the second boss, the downstream section with when experimental section is connected, the second boss encloses to be located the periphery of downstream section.
Preferably, the upstream section and the downstream section are both rectangular tubes, and the upstream section and the downstream section have the same size.
Preferably, the distance between the upstream test section and the sound source device is greater than 3 times the length of the side of the cross section of the rectangular tube, and the distance between the upstream test section and the test section is greater than 1/2 times the length of the side of the cross section of the rectangular tube.
The utility model has the advantages that:
the insertion loss testing device measures the sound pressure level of sound waves passing through the front and back of the piece to be tested by arranging the upstream testing section and the downstream testing section, the upstream testing section and the downstream testing section are respectively provided with a plurality of testing microphone mounting hole sites, the acoustic effect of the piece to be tested in different frequency bands can be tested, the device is simple in structure, the cost of each component forming the device is low, and the device is suitable for being used in the research and development stage of a silencer.
This insertion loss testing arrangement still is provided with the noise elimination end, can absorb the sound wave of transmitting the downstream section, prevents the sound wave reflection, improves and measures the rate of accuracy.
Drawings
Fig. 1 is a schematic structural diagram of an insertion loss testing apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a test section according to an embodiment of the present invention.
In the figure:
1. a sound source device; 2. an upstream section; 3. a test section; 4. a downstream section; 5. a sound-deadening tip; 31. a box body; 32. a box cover; 311. a reinforcing structure; 312. a first boss; 313. a second boss; 321. a handle; 100. an upstream test section; 200. a downstream test section.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly and can include, for example, fixed or removable connections, mechanical or electrical connections, direct connections, indirect connections through an intermediary, communication between two elements, or an interaction between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the description of the present invention, unless otherwise expressly specified or limited, the first feature "on" or "under" the second feature may include both the first and second features being in direct contact, and may also include the first and second features being in contact, not in direct contact, but with another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
As shown in fig. 1, the utility model provides an insertion loss testing device, which comprises a sound source device 1, an upstream section 2, a testing section 3 and a downstream section 4 which are connected in sequence, wherein the upstream section 2 and the downstream section 4 are coaxially arranged, the testing section 3 is used for installing a piece to be tested, and sound waves emitted by the sound source device 1 can sequentially pass through the piece to be tested in the upstream section 2 and the testing section 3 and the downstream section 4; the upstream section 2 is provided with an upstream testing section 100, the downstream section 4 is provided with a downstream testing section 200, the upstream testing section 100 and the downstream testing section 200 are symmetrically arranged relative to the testing section 3, and the upstream testing section 100 and the downstream testing section 200 can be matched with each other to measure the acoustic performance of the piece to be tested.
The selection of the sound source device 1 needs to be determined according to the range of the test frequency band, the sound wave emitted by the sound source device 1 needs to cover the test frequency band, the upstream test section 100 can measure the sound pressure level of the sound wave before passing through the piece to be tested, the downstream test section 200 can measure the sound pressure level of the sound wave after passing through the piece to be tested, and the insertion loss of the piece to be tested is the difference of the two sound pressure levels. The upstream test section 100 and the downstream test section 200 are respectively provided with a plurality of test microphone mounting holes, and the plurality of test microphone mounting holes are arranged according to the frequency band of sound waves, so that the acoustic effect of the piece to be tested in different frequency bands can be tested. The insertion loss testing device is simple in structure, and the cost of each component forming the device is low, so that the insertion loss testing device is suitable for being used in the development stage of a silencer.
Optionally, the upstream segment 2 and the downstream segment 4 are both rectangular tubes, the upstream segment 2 and the downstream segment 4 have the same size, and the inner tube wall surfaces of the upstream segment 2 and the downstream segment 4 are smooth, rigid and dense enough to avoid being excited by sound signals to generate vibration during use.
The sound wave emitted from the sound source device 1 generates plane wave and non-plane wave modes in the upstream section 2, and those non-plane wave modes with frequencies lower than the cutoff frequency of the first higher-order wave mode are attenuated within a distance of about three times the side length of the cross section of the rectangular tube, and preferably, the distance between the upstream test section 100 and the sound source device 1 is greater than 3 times the side length of the cross section of the rectangular tube, and specifically, when the side lengths of the two adjacent sides of the cross section of the rectangular tube are not equal, the distance between the upstream test section 100 and the sound source device 1 is greater than 3 times the side length of the long side. Since the piece to be tested can cause sound field distortion, optionally, the distance between the upstream test section 100 and the test section 3 is greater than 1/2 of the side length of the section of the rectangular tube, specifically, when the side lengths of two adjacent sides of the section of the rectangular tube are not equal, the distance between the upstream test section 100 and the test section 3 is greater than 1/2 of the side length of the long side.
Optionally, the insertion loss testing device further comprises a silencing tail end 5 connected to the downstream section 4, the test section 3 and the silencing tail end 5 are respectively located at two ends of the downstream section 4 in the length direction, and the silencing tail end 5 can absorb sound waves transmitted to the downstream section 4, so that the sound waves are prevented from being reflected to influence a measurement experiment, and the measurement accuracy is improved.
According to the principle that sound waves propagate along a straight line, the sound attenuation tail end 5 is preferably of a straight pipe structure, and the size of the end face of the sound attenuation tail end 5 is the same as that of the cross section of the downstream section 4, so that the sound waves can be completely introduced into the sound attenuation tail end 5. Optionally, the sound absorption material is filled in the sound attenuation tail end 5, the length of the sound attenuation tail end 5 is 1/4-1/2 of the wavelength corresponding to the cut-off frequency of the sound wave emitted by the sound source device 1, the length of the sound attenuation tail end 5 and the sound absorption material are selected on the principle that a good sound absorption effect can be achieved, preferably, the length of the sound attenuation tail end 5 is 1/3 of the wavelength corresponding to the cut-off frequency of the sound wave emitted by the sound source device 1, and the sound absorption material is selected from melamine foam cotton with good environmental protection performance.
Optionally, the test section 3 includes a box 31 and a box cover 32, the box cover 32 is detachably connected to the box 31, and after the box cover 32 is removed, the operator performs an installation or a disassembly operation on the to-be-tested piece, and preferably, the box cover 32 is connected to the box 31 by a snap.
Preferably, the box cover 32 is provided with two handles 321, which facilitate the operator to take the box cover 32, and more preferably, the specific positions of the two handles 321 are set according to the ergonomic principle.
In order to make the fixing of the test section 3 more secure, optionally, a reinforcing structure 311 is provided on the box 31, the reinforcing structure 311 extends along the height direction of the box 31, and the reinforcing structure 311 is provided on each outer side surface of the box 31.
Preferably, a first boss 312 is arranged at the joint of the box body 31 and the upstream section 2, and when the upstream section 2 is connected with the test section 3, the first boss 312 is arranged around the periphery of the upstream section 2; the junction of box 31 and downstream section 4 is provided with second boss 313, and when downstream section 4 and experimental section 3 were connected, second boss 313 surrounded the periphery of locating downstream section 4. The arrangement of the first boss 312 and the second boss 313 enables the sound waves to be transmitted from the upstream section 2, and in the process of being transmitted to the downstream section 4 after passing through the piece to be measured, the conditions of sound wave reflection and loss are reduced, and the measurement accuracy is improved.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The insertion loss testing device is characterized by comprising a sound source device (1), an upstream section (2), a test section (3) and a downstream section (4), wherein the sound source device (1), the upstream section (2) and the downstream section (4) are connected in sequence, the test section (3) is used for mounting a piece to be tested, and sound waves emitted by the sound source device (1) can sequentially penetrate through the upstream section (2), the piece to be tested in the test section (3) and the downstream section (4);
the acoustic performance testing device is characterized in that an upstream testing section (100) is arranged on the upstream section (2), a downstream testing section (200) is arranged on the downstream section (4), the upstream testing section (100) and the downstream testing section (200) are symmetrically arranged relative to the testing section (3), and the upstream testing section (100) and the downstream testing section (200) can be matched with each other to measure the acoustic performance of a piece to be tested.
2. The insertion loss testing device according to claim 1, further comprising a sound-deadening tip (5) attached to the downstream section (4), the trial section (3) and the sound-deadening tip (5) being located at both ends in a length direction of the downstream section (4), respectively.
3. The insertion loss testing device according to claim 2, characterized in that the sound-attenuating tip (5) is of a straight tube construction, the end face of the sound-attenuating tip (5) being of the same size as the cross-section of the downstream section (4).
4. The insertion loss testing device according to claim 3, wherein the silencing tail end (5) is filled with a sound absorption material, and the length of the silencing tail end (5) is 1/4-1/2 of the wavelength corresponding to the cut-off frequency of the sound wave emitted by the sound source device (1).
5. The insertion loss testing device according to claim 1, wherein the test section (3) comprises a box body (31) and a box cover (32), the box cover (32) being detachably connected to the box body (31).
6. The insertion loss testing device according to claim 5, wherein a handle (321) is provided on the case lid (32).
7. Insertion loss testing device according to claim 5, wherein a reinforcing structure (311) is provided on the box (31), the reinforcing structure (311) extending in the height direction of the box (31).
8. The insertion loss testing device according to claim 5, wherein a first boss (312) is arranged at the joint of the box body (31) and the upstream section (2), and when the upstream section (2) is connected with the test section (3), the first boss (312) is arranged around the periphery of the upstream section (2);
the junction of box (31) with downstream section (4) is provided with second boss (313), when downstream section (4) with experimental section (3) are connected, second boss (313) enclose locate the periphery of downstream section (4).
9. The insertion loss testing device according to claim 1, wherein the upstream section (2) and the downstream section (4) are both rectangular tubes, the upstream section (2) and the downstream section (4) being of the same size.
10. The insertion loss testing device according to claim 9, wherein the distance between the upstream testing section (100) and the sound source device (1) is greater than 3 times the length of the side of the rectangular tube cross-section, and the distance between the upstream testing section (100) and the testing section (3) is greater than 1/2 times the length of the side of the rectangular tube cross-section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921214935.4U CN210347550U (en) | 2019-07-30 | 2019-07-30 | Insertion loss testing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921214935.4U CN210347550U (en) | 2019-07-30 | 2019-07-30 | Insertion loss testing device |
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| Publication Number | Publication Date |
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| CN210347550U true CN210347550U (en) | 2020-04-17 |
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| CN201921214935.4U Active CN210347550U (en) | 2019-07-30 | 2019-07-30 | Insertion loss testing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114076674A (en) * | 2021-11-20 | 2022-02-22 | 西北工业大学 | Acoustic measurement device and method suitable for outlet of cascade rectangular pipeline |
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2019
- 2019-07-30 CN CN201921214935.4U patent/CN210347550U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114076674A (en) * | 2021-11-20 | 2022-02-22 | 西北工业大学 | Acoustic measurement device and method suitable for outlet of cascade rectangular pipeline |
| CN114076674B (en) * | 2021-11-20 | 2024-01-16 | 西北工业大学 | Acoustic measurement device and method suitable for blade grid rectangular pipeline outlet |
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