CN203101335U - Acoustic test equipment-reverberation box - Google Patents
Acoustic test equipment-reverberation box Download PDFInfo
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- CN203101335U CN203101335U CN 201320023521 CN201320023521U CN203101335U CN 203101335 U CN203101335 U CN 203101335U CN 201320023521 CN201320023521 CN 201320023521 CN 201320023521 U CN201320023521 U CN 201320023521U CN 203101335 U CN203101335 U CN 203101335U
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Abstract
The utility model discloses an acoustic test equipment-reverberation box which comprises an outer wall, an air layer, glass fiber cotton, an inner wall, a rubber gasket, I-shaped steel, a diffuser, a sponge gasket, a fixture, fixture handles, a threaded hole, a bolt, universal wheels, a wiring hole and a sound source positioning pin, wherein the box body sequentially consists of the outer wall, the air layer, the glass fiber cotton and the inner wall from exterior to interior; the outer wall and the inner wall are connected through elastic support formed by the I-shaped steel provided with the rubber gasket; the bottom of the outer wall is provided with four universal wheels; the diffuser and the sound source positioning pin are arranged on three adjacent surfaces of the inner wall; the lower part of the reverberation box is provided with a wiring hole; the window part is provided with the sponge gasket and the fixture; threaded holes are formed in the outer wall and the fixture, and the outer wall and the fixture are connected through a bolt; and two fixture handles are arranged on the fixture. The sound reduction index of the box body can be effectively improved, and the operation is convenient; and moreover, the measurement result is consistent with the result in practical engineering, the testing area of the material to be tested is greatly reduced, the cost is saved, and the efficiency is improved.
Description
Technical field
The utility model relates to a kind of sound insulation of research material under the reverberation space, acoustic test equipment of sound absorption characteristics-reverberation case of being used for, and is particularly useful for small specimen.
Background technology
Along with growth in the living standard; people more and more pay attention to the tonequality problem; this just need test the acoustic characteristic of test specimen; but when sound insulation of measuring finished product and sound absorption characteristics; usually can run into three problems; the one, test specimen can not cut puts into the standing wave tube measurement, and the 2nd, the construction cost of reverberation chamber is too high, and the 3rd, the size of test specimen is less can not finish acoustical testing by reverberation chamber.
Summary of the invention
The purpose of this utility model is in order to overcome the deficiencies in the prior art, to provide a kind of and can measure the sound insulation of small specimen, the equipment of sound absorption characteristics-reverberation case.
A kind of acoustic test equipment-reverberation case, it comprises outer wall, air layer, glass fibre cotton, inwall, rubber sheet gasket, i shaped steel, diffuser, sponge pad, anchor clamps, anchor clamps handle, threaded hole, bolt, universal wheel, routing hole, auditory localization pin; Outer wall, air layer, glass fibre cotton, inwall are installed successively, be provided with the resiliency supported that rubber sheet gasket and i shaped steel are formed between outer wall and the inwall, the outer wall bottom is installed on four universal wheels, three adjacent surfaces of inwall diffuser, auditory localization pin is installed, reverberation case lower right side is provided with a routing hole, the window position is provided with on sponge pad and anchor clamps, outer wall and the anchor clamps threaded hole, connect by bolt, arrange two anchor clamps handles on the anchor clamps.
The lamination layer structure that casing adopts outer wall, air layer, glass fibre cotton, inwall to link to each other successively.
Case Internal Spherical Surface diffuser can reflect sound wave because of the difference of its surface configuration and size to different directions, thereby guarantees that sound field evenly distributes in the reverberation case, has identical sound energy density everywhere.
The resiliency supported of forming by rubber sheet gasket and i shaped steel between outer wall and inwall connects, and the vibration that can well ground be come is lowered, prevent its excite in wall vibrations and the sound field that produces influence the internal acoustic field distribution.
The utility model can effectively improve the casing oise insulation factor, and is easy to operate; Guaranteed consistance in measurement result and the actual engineering, significantly reduced the test area of detected materials simultaneously, saved cost, raised the efficiency.
Description of drawings
The structural representation of Fig. 1 reverberation case;
Fig. 2 reverberation case A-A sectional view;
Fig. 3 reverberation case test synoptic diagram;
Fig. 4 reverberation case sound insulation curve;
Each microphone sound pressure level in Fig. 5 reverberation case;
The experiment of Fig. 6 magnesium alloy plate sound insulation characteristics contrasts with the result of quality rule;
The contrast of experiment of Fig. 7 magnesium alloy plate sound insulation characteristics and simulation result;
Wherein, outer wall 1, air layer 2, glass fibre cotton 3, inwall 4, rubber sheet gasket 5, i shaped steel 6, diffuser 7, sponge pad 8, anchor clamps 9, anchor clamps handle 10, threaded hole 11, bolt 12, universal wheel 13, routing hole 14, auditory localization pin 15.
Embodiment
Below in conjunction with drawings and Examples the utility model is described further.A kind of acoustic test equipment-reverberation case, from Fig. 1-2 as can be known, it comprises outer wall 1, air layer 2, glass fibre cotton 3, inwall 4, rubber sheet gasket 5, i shaped steel 6, diffuser 7, sponge pad 8, anchor clamps 9, anchor clamps handle 10, threaded hole 11, bolt 12, universal wheel 13, routing hole 14, auditory localization pin 15; Outer wall 1, air layer 2, glass fibre cotton 3, inwall 4 are installed successively, be provided with the resiliency supported that rubber sheet gasket 5 and i shaped steel 6 are formed between outer wall 1 and the inwall 2, outer wall 1 bottom is installed diffuser 7, auditory localization pin 15 is installed on four universal wheels 8,4 three adjacent surfaces of inwall, reverberation case lower right side is provided with a routing hole 14, the window position is provided with on sponge pad 8 and anchor clamps 9, outer wall 1 and the anchor clamps 9 threaded hole 11, connect by bolt 12, arrange two anchor clamps handles 10 on the anchor clamps 9.
The lamination layer structure that casing adopts outer wall 1, air layer 2, glass fibre cotton 3, inwall 4 to link to each other successively.
Case Internal Spherical Surface diffuser 7 differences because of its surface configuration and size can reflect sound wave to different directions, thereby guarantee that sound field evenly distributes in the reverberation case, have identical sound energy density everywhere.
The resiliency supported of forming by rubber sheet gasket 5 and i shaped steel 6 between outer wall 1 and inwall 4 connects, and the vibration that can well ground be come is lowered, and prevents that it from exciting inwall 4 vibrations and the sound field that produces influence the internal acoustic field distribution.
Embodiment
Each layer thickness of reverberation case composite structure is: interior case steel plate thickness is 4mm, and glass fibre cotton thickness is 70mm, and air layer thickness is 10mm, and outer container steel plate thickness is 3mm.Experiment is finished in semianechoic room, does not have other sound source on every side.The actual measurement ground unrest is 35.1dB.Be brushed with white enamel paint in the case, make the case inside surface smooth, reduced the acoustical absorption coefficient of interior case.Two loudspeakers are installed, as the sound source of test on the reverberation case inner opposite angle position.
Settle three microphones in the reverberation case, as shown in Figure 3.By steel plate and acoustic absorbant reverberation case test specimen installation site is sealed.Microphone 1,2 and 3 is not less than 0.3 meter apart from inwall in the case, is not less than 0.4 meter apart from the position of loudspeaker, highly is uniformly distributed in the reverberation case on the case between lower wall surface.The outer microphone 4,5 of case highly is 0.65 meter, apart from 1 meter of tank wall.
Fig. 4 has provided the oise insulation factor under two kinds of microphone arrangements.Be not difficult to find out also that from figure the oise insulation factor of twice experiment reverberation case is more or less the same, illustrate that the oise insulation factor of reverberation case has stability preferably.
Fig. 5 is in order to verify whether the sound field distribution is even in the reverberation case, the sound pressure level curve of reverberation case under two kinds of different operating modes (case1 and case2), under the different microphone position.Three microphones record acoustic pressure and found that the reverberation case is under same operating mode in the contrast reverberation case, and inwardly the sound pressure level at diverse location place differs very little.Illustrate that the sound field distribution in the reverberation case is uniform.
Sound insulation characteristics to the magnesium alloy plate has been carried out experimental study, and the structure of result of study and theory and emulation contrasts, as shown in Figure 6 and Figure 7.Fig. 6 is the contrast of magnesium alloy plate sound insulation characteristics experiment with simulation result for result's contrast of magnesium alloy plate sound insulation characteristics experiment with the quality rule, Fig. 7.No matter the sound insulation characteristics curve of magnesium alloy plate is at low frequency or can both coincide good with theoretical and simulation result well at high frequency under the reverberation case as can be seen.As seen the design of reverberation case is reasonable and reliable.
Table 1 is the reverberation time of reverberation case under 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz and 8000Hz.
The reverberation time of table 1 reverberation case
| Frequency/Hz | 125 | 250 | 500 | 1000 |
| Reverberation time/s | 2.125 | 2 | 2.125 | 2.25 |
| Frequency/ |
2000 | 4000 | 8000 | ? |
| Reverberation time/s | 2.125 | 2 | 2.125 | ? |
As seen, under different frequency, the reverberation time of reverberation case all was not less than 2.0 seconds, illustrated that the reverberation case all has reverberation effect preferably.
Claims (4)
1. acoustic test equipment-reverberation case, it is characterized in that it comprises outer wall (1), air layer (2), glass fibre cotton (3), inwall (4), rubber sheet gasket (5), i shaped steel (6), diffuser (7), sponge pad (8), anchor clamps (9), anchor clamps handle (10), threaded hole (11), bolt (12), universal wheel (13), routing hole (14), auditory localization pin (15); Outer wall (1), air layer (2), glass fibre cotton (3), inwall (4) is installed successively, be provided with the resiliency supported that rubber sheet gasket (5) and i shaped steel (6) are formed between outer wall (1) and the inwall (2), four universal wheels (8) are installed in outer wall (1) bottom, on (4) three adjacent surfaces of inwall diffuser (7) is installed, auditory localization pin (15), reverberation case lower right side is provided with a routing hole (14), the window position is provided with sponge pad (8) and anchor clamps (9), on outer wall (1) and the anchor clamps (9) threaded hole (11) is arranged, connect by bolt (12), anchor clamps (9) are gone up and are arranged two anchor clamps handles (10).
2. according to claims 1 described a kind of acoustic test equipment-reverberation case, it is characterized in that the lamination layer structure that casing adopts outer wall (1), air layer (2), glass fibre cotton (3), inwall (4) to link to each other successively.
3. according to claims 1 described a kind of acoustic test equipment-reverberation case, it is characterized in that, case Internal Spherical Surface diffuser (7) is because of the difference of its surface configuration and size, sound wave can be reflected to different directions, thereby guarantee that sound field evenly distributes in the reverberation case, have identical sound energy density everywhere.
4. according to claims 1 described a kind of acoustic test equipment-reverberation case, it is characterized in that, the resiliency supported of forming by rubber sheet gasket (5) and i shaped steel (6) between outer wall (1) and inwall (4) connects, the vibration that ground can be come is lowered, and prevents that it from exciting inwall (4) vibration and the sound field that produces influence the internal acoustic field distribution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320023521 CN203101335U (en) | 2013-01-16 | 2013-01-16 | Acoustic test equipment-reverberation box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320023521 CN203101335U (en) | 2013-01-16 | 2013-01-16 | Acoustic test equipment-reverberation box |
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| Publication Number | Publication Date |
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| CN203101335U true CN203101335U (en) | 2013-07-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320023521 Expired - Fee Related CN203101335U (en) | 2013-01-16 | 2013-01-16 | Acoustic test equipment-reverberation box |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103105436A (en) * | 2013-01-16 | 2013-05-15 | 浙江大学 | Acoustic test equipment-reverberation box |
| CN111781272A (en) * | 2019-10-24 | 2020-10-16 | 东北大学 | Composite material vibration and noise reduction tester and method based on reverberation plane acoustic wave excitation |
-
2013
- 2013-01-16 CN CN 201320023521 patent/CN203101335U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103105436A (en) * | 2013-01-16 | 2013-05-15 | 浙江大学 | Acoustic test equipment-reverberation box |
| CN111781272A (en) * | 2019-10-24 | 2020-10-16 | 东北大学 | Composite material vibration and noise reduction tester and method based on reverberation plane acoustic wave excitation |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130731 Termination date: 20150116 |
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| EXPY | Termination of patent right or utility model |