CN114487123A - Sound insulation testing device and sound insulation testing method - Google Patents
Sound insulation testing device and sound insulation testing method Download PDFInfo
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- CN114487123A CN114487123A CN202210006748.7A CN202210006748A CN114487123A CN 114487123 A CN114487123 A CN 114487123A CN 202210006748 A CN202210006748 A CN 202210006748A CN 114487123 A CN114487123 A CN 114487123A
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- 238000009413 insulation Methods 0.000 title claims abstract description 189
- 238000012360 testing method Methods 0.000 title claims abstract description 94
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 53
- 239000010959 steel Substances 0.000 claims abstract description 53
- 239000002023 wood Substances 0.000 claims abstract description 42
- 238000003825 pressing Methods 0.000 claims abstract description 28
- 239000010802 sludge Substances 0.000 claims abstract description 5
- 238000010998 test method Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 18
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- 230000004075 alteration Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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- G—PHYSICS
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- 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
- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N2291/01—Indexing codes associated with the measuring variable
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention provides a sound insulation testing device and a sound insulation testing method, wherein the device comprises: the sound insulation cave entrance is arranged along one side wall of the sound source chamber; the positioning bolts are uniformly installed on the wall along the edge of the sound insulation opening; the fastening clamp is correspondingly arranged at the positioning bolt through the through hole; the steel baffle plate is welded on the inner side wall surface of the sound insulation cave, and the inner side of the steel baffle plate is pasted with the rubber gasket; the sound insulation test sample is placed in the sound insulation cave opening, the edge of the sound insulation test sample props against the rubber gasket on the inner side of the steel baffle, and the sound insulation test sample and the sound insulation cave opening are sealed by adopting oil sludge; and the wood pressing strip is arranged corresponding to the boundary of the sound insulation sample, and the fastening clamp is abutted against the wood pressing strip. The device can enable the small-size rectangular thin plate to be capable of achieving an approximate simply supported boundary in the sound insulation opening, is simple and convenient to operate, is stable and controllable in sample boundary, is beneficial to greatly improving the sound insulation test efficiency and the repeatability and reproducibility of test results, and is particularly suitable for the sound insulation test process of the small-size material thin plate without clear use occasions.
Description
Technical Field
The invention relates to the technical field of sound insulation performance testing, in particular to a sound insulation testing device and a sound insulation testing method.
Background
The existing sound insulation test standard mainly aims at building samples such as doors, windows, glass and the like, but the test requirements on sound insulation samples of general materials are not very clear. The material type sound insulation sample is variable in use occasion, so that the material type sound insulation sample is often made into a standard rectangular plate-shaped sample with a smaller size to carry out sound insulation test research, and compared with a large-size sample, the sample preparation and test of the small-size sample are easier to realize and are convenient for rule discovery.
However, the sound insulation test of small-size samples is particularly sensitive to installation conditions, the current conventional sample installation method is mainly a wall building installation method, but installation conditions of different laboratories often have small differences, the differences mainly affect boundary conditions of the samples, and particularly below the matching frequency, the influence degree is further increased due to the fact that the samples have strong modal characteristics, and the vibration modes are closely related to the boundaries of the samples. The main reason why the sound insulation test of the same sample is carried out in different laboratories according to standards is that the result difference is large, and the repeatability and reproducibility of the test result are not ideal.
How to improve the repeatability and reproducibility of the test result becomes one of the problems to be solved urgently in the field of the existing sound insulation test.
Disclosure of Invention
The present inventors have made a study and recognition of the following problems:
the sound insulation test of the same sample is carried out in different laboratories according to the standard, and larger result difference may exist. The same sample, laboratories A, B and C, were tested to a uniform standard, but always gave very different test results; even different operators of the same laboratory will measure different results. This is because there is no clear regulation for the installation conditions of the sample in the standard, which results in that each laboratory and each experimenter install the sample in a customary manner, for example, some laboratories install the sample by a wall building method, some laboratories install the sample by a clipping edge method, some experimenters clip the sample tightly, and some experimenters clip the sample slightly loosely, so the difference of the installation methods can cause serious influence on the boundary conditions of the sample, and the boundary conditions have great influence on the acoustic performance of the sample, thus resulting in different test results. For example, for the same wood veneer, laboratory A measures 35 db and laboratory B measures 32 db, or laboratory 1 measures 35 db and laboratory 2 measures 34 db. Then, according to the classification standard of the sound insulation value of the material, laboratory A can define that the material belongs to Class A, and laboratory B can define that the material belongs to Class B, which causes trouble to the classification of the acoustic performance of the sample.
One effective way to improve the reproducibility and reproducibility of the test results is to make the sample have a stable and controllable boundary, i.e., the mounting and fixing methods of the sample, including the fabrication of specific devices, specific bolt torques, specific sealing methods, etc., can be streamlined. For a material sound insulation sample without a clear use occasion, the boundary under the actual use condition cannot be simulated, so that the boundary supporting condition of the sample in the sound insulation test needs to be considered to be uniform. Typical boundaries such as free, simple and fixed boundaries are primarily considered options, wherein the free boundary is often approximately realized in an elastic suspension mode, the fixed boundary can be realized by welding a heavy metal frame with high rigidity on the periphery of a test sample, but in a sound insulation test, the periphery of a plate is inevitably contacted with a hole and needs to be sealed, so that the free boundary is not easy to realize, and on the other hand, the sound insulation test sample needs to be frequently disassembled and replaced in the test, so that the implementation of the fixed boundary is inconvenient. The implementation of the simple boundary has feasibility, and the numerical calculation of the simple boundary is also beneficial to simulation.
The present invention is directed to solving the above-mentioned problems, and a first object of the present invention is to provide a sound insulation testing apparatus.
The second purpose of the invention is to provide a sound insulation testing device.
The technical scheme adopted by the invention is as follows:
an embodiment of a first aspect of the present invention provides a sound insulation testing device, including: the sound insulation cave opening is arranged along the wall on one side of the sound source chamber; the positioning bolts are uniformly installed along the wall extending along the edge of the sound insulation opening; the fastening clamp is correspondingly installed at the positioning bolt through a through hole and is used for applying fastening pressure; the steel baffle is welded on the inner side wall surface of the sound insulation cave, and a rubber gasket is adhered on the inner side of the steel baffle; the sound insulation test sample is placed in the sound insulation hole, the edge of the sound insulation test sample props against the rubber gasket on the inner side of the steel baffle, and the sound insulation test sample and the sound insulation hole are sealed through oil sludge; the wood pressing strip is arranged corresponding to the boundary of the sound insulation sample, and the fastening clamp props against the wood pressing strip, so that the edge of the sound insulation sample is clamped by the wood pressing strip and the steel baffle from two sides.
The sound insulation testing device provided by the invention can also have the following additional technical characteristics:
according to one embodiment of the invention, the sound insulation sample is a rectangular plate-shaped member with the side length less than or equal to 1m and the thickness less than or equal to 15 mm.
According to one embodiment of the invention, the positioning bolts are M16 bolts, the number of the positioning bolts is 12, and the positioning bolts are respectively arranged at each corner of the sound insulation cave opening and at the trisection point of each side of the sound insulation cave opening.
According to one embodiment of the invention, the number of the fastening clamps is 12, each fastening clamp is composed of a steel block of 100mm x 40mm x 15mm and an M12 bolt, the steel block is provided with 1 phi 18 through hole and 1 phi 12 threaded hole, the fastening clamp is installed at the positioning bolt through the phi 18 through hole, and the M12 bolt applies fastening pressure to the sound insulation test sample through the phi 12 threaded hole.
According to one embodiment of the invention, the steel baffle plate is welded in the sound insulation cave opening 200mm away from one side of the sound source chamber, the size of the steel baffle plate is 20mm in width and 2mm in thickness, and the rubber gasket is 3mm rubber gasket.
According to one embodiment of the invention, the number of the wood battens is 4, the cross-sectional dimension of the wood battens is 20mm multiplied by 20mm, the M12 bolts uniformly support against the wood battens, and a pre-tightening torque of 4N M is applied to each M12 bolt.
An embodiment of a second aspect of the present invention provides a sound insulation testing method, including the steps of: positioning bolts are uniformly arranged on the wall extending along the edge of the sound insulation opening on one side of the sound source chamber; installing a fastening clamp on the positioning bolt through the through hole; welding a steel baffle on the inner side wall surface of the sound insulation cave, and sticking a rubber gasket on the inner side of the steel baffle; placing a sound insulation sample in the sound insulation opening, and sealing the edge of the sound insulation sample; and arranging a wood pressing strip corresponding to the boundary of the sound insulation sample, wherein the fastening clamp props against the wood pressing strip so that the edge of the sound insulation sample is clamped by the wood pressing strip and the steel baffle plate from two sides.
According to one embodiment of the invention, the sound insulation sample is a rectangular plate-shaped member with the side length less than or equal to 1m and the thickness less than or equal to 15 mm.
According to one embodiment of the invention, the positioning bolts are M16 bolts, the number of the positioning bolts is 12, and the positioning bolts are respectively arranged at each corner of the sound insulation cave opening and at the trisection point of each side of the sound insulation cave opening.
According to one embodiment of the invention, the number of the fastening clamps is 12, each fastening clamp is composed of a steel block of 100mm × 40mm × 15mm and an M12 bolt, the steel block is provided with 1 phi 18 through hole and 1 phi 12 threaded hole, the fastening clamp is installed at the positioning bolt through the phi 18 through hole, and the M12 bolt applies fastening pressure to the sound insulation test sample through the phi 12 threaded hole.
The invention has the beneficial effects that:
the invention can enable the small-size rectangular thin plate to realize an approximate simply supported boundary in the sound insulation opening, has simple and convenient operation and stable and controllable sample boundary, is beneficial to greatly improving the sound insulation test efficiency and the repeatability and reproducibility of test results, and is particularly suitable for the sound insulation test process of the small-size material thin plate without clear use occasions.
Drawings
FIG. 1 is a schematic perspective view of a sound insulation testing device according to an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion A of the sound isolation test apparatus shown in FIG. 1 according to one embodiment of the present disclosure;
FIG. 3 is a side view of a sound insulation testing device according to one embodiment of the present invention;
fig. 4 is a graph comparing a frequency response curve test value and a simple-supported boundary theoretical value of sound insulation sample 1 according to one specific example of the present invention;
fig. 5 is a graph comparing a frequency response curve test value with a simple boundary theoretical value of a sound insulation sample 2 according to one specific example of the present invention;
fig. 6 is a graph comparing a frequency response curve test value with a simple boundary theoretical value of a sound insulation sample 3 according to one specific example of the present invention;
fig. 7 is a graph comparing a frequency response curve test value with a simple boundary theoretical value of a sound insulation sample 4 according to one embodiment of the present invention;
fig. 8 is a graph comparing a frequency response curve test value with a simple boundary theoretical value of sound insulation sample 5 according to one embodiment of the present invention;
fig. 9 is a graph comparing a frequency response curve test value with a simple boundary theoretical value of a sound insulation sample 6 according to one specific example of the present invention;
FIG. 10 is a flow chart of a sound insulation testing method according to one embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic perspective view of a sound insulation testing device according to an embodiment of the present invention, fig. 2 is a partially enlarged view of the sound insulation testing device shown in fig. 1 according to an embodiment of the present invention, and fig. 3 is a side view of the sound insulation testing device according to an embodiment of the present invention.
It should be noted that the sound insulation testing device provided by the invention is based on a building sample.
As shown in fig. 1-3, the sound insulation test apparatus includes: the sound insulation tunnel comprises a sound insulation tunnel opening 1, a positioning bolt 2, a fastening clamp 3, a steel baffle 4, a sound insulation sample 5 and a wood pressing strip 6.
Wherein, the sound insulation cave entrance 1 is arranged along one side wall of the sound source chamber; the positioning bolts 2 are uniformly arranged along the wall along the edge of the sound insulation cave entrance 1; the fastening jig 3 is correspondingly installed at the set bolt 2 through the through hole, and the fastening jig 3 is used for applying fastening pressure. The steel baffle 4 is welded on the inner side wall surface of the sound insulation cave entrance 1, and a rubber gasket 7 is stuck on the inner side of the steel baffle 4; the sound insulation test sample 5 is placed in the sound insulation cave entrance 1, the edge of the sound insulation test sample 5 props against the rubber gasket 7 on the inner side of the steel baffle 4, and a gap between the sound insulation test sample 5 and the sound insulation cave entrance 1 is sealed by adopting oil sludge 8; the wood pressing strip 6 is arranged corresponding to the boundary of the sound insulation sample 5, and the fastening clamp 2 props against the wood pressing strip 6, so that the edge of the sound insulation sample 5 is clamped by the wood pressing strip 6 and the steel baffle 4 from two sides.
The sound insulation sample 5 is a small-size rectangular thin plate, namely a rectangular plate-shaped member with the side length less than or equal to 1m and the thickness less than or equal to 15 mm.
Further, in a specific example of the present invention, as shown in fig. 1, the positioning bolts 2 are M16 bolts, and the number of the positioning bolts 2 is 12, which are respectively provided at each corner of the sound-proof opening 1 and at the trisection point of each side of the sound-proof opening 1.
In one specific example of the present invention, the number of the fastening jigs 3 is 12, as shown in fig. 2, each fastening jig 3 is composed of a steel block 31 of 100mm × 40mm × 15mm and an M12 bolt 32, and the steel block 31 is provided with 1 through hole of phi 18 and 1 threaded hole of phi 12, the fastening jig 3 is mounted at the positioning bolt through the through hole of phi 18, and the M12 bolt 32 applies fastening pressure to the sound insulation test piece 5 through the threaded hole of phi 12.
According to one embodiment of the invention, the steel baffle plate 4 is welded in the sound insulation cave mouth 1 200mm away from one side of the sound source chamber, the steel baffle plate 4 is 20mm in width and 2mm in thickness, and the rubber gasket is a 3mm rubber gasket 7.
According to one embodiment of the invention, the number of the wood battens 6 is 4, the cross-sectional dimension of the wood battens 6 is 20mm × 20mm, the M12 bolts uniformly support the wood battens 6, and each M12 bolt is applied with a pretension torque of 4N · M.
That is, 4 wood beads 6 having a cross-sectional size of 20mm × 20mm were pressed against 4 sides of the sound insulation test piece 5 while being uniformly pressed against the wood beads 6 on the sound source chamber side by the twelve M12 bolts 32 of the fastening jig 3, and a pre-tightening torque of 4N · M was applied to each M12 bolt. The edges of the sound insulation test piece 5 are clamped from both sides by the wooden batten 6 and the steel baffle 4 and are thereby fastened in the sound insulation opening 1.
Therefore, the sound insulation sample can be installed in the sound insulation cave entrance to achieve an approximate simply supported boundary, and the detection device can be popularized and applied in different test environments.
By using the sound insulation testing device, 6 different sound insulation samples (shown in table 1, different thicknesses and different materials are covered) are respectively installed in the sound insulation cave entrance 1, so that an approximate simply supported boundary can be realized. And then performing modal tests on the 6 sound insulation samples after being installed in the sound insulation cave according to the invention, and sequentially showing comparison results of Frequency Response curve test values and simple support boundary theoretical values of the 6 sound insulation samples in fig. 4-9, wherein the horizontal axis of fig. 4-9 represents the tested Frequency, the vertical axis represents the structure speed Frequency Response FRF (Frequency Response Function) of the sample along with the Frequency, and the two curves are respectively the Frequency Response curve (structure speed Frequency Response along with the Frequency) of the corresponding sound insulation sample and the simple support boundary theoretical value. It can be seen from fig. 4 to 9 that, by adopting the technical scheme of the invention, the goodness of fit between the frequency response curve test value and the simple support boundary theoretical value is good.
TABLE 1
Further, table 2 shows a comparison between the first 5-order modal frequency test value and the theoretical calculation value of the simple boundary based on fig. 4 to 9, and it can be seen that the error percentages of the modal frequencies are all below 5%, and most of the error percentages are not more than 3%. The implementation result proves that the scheme provided by the invention enables the sound insulation sample (thin plate) to realize an approximate simply supported boundary in the sound insulation cave entrance, and the implementation result is reliable and effective.
TABLE 2
In summary, according to the sound insulation testing device provided by the embodiment of the invention, the sound insulation cave opening is formed along the wall on one side of the sound source chamber, the positioning bolts are uniformly installed on the wall extending along the edge of the sound insulation cave opening, the fastening clamp is correspondingly installed at the positioning bolts through the through holes to apply fastening pressure, the steel baffle plate is welded on the inner side wall surface of the sound insulation cave opening, the rubber gasket is pasted on the inner side of the steel baffle plate, the sound insulation sample is placed in the sound insulation cave opening, the edge of the sound insulation sample abuts against the rubber gasket on the inner side of the steel baffle plate, the sound insulation sample and the sound insulation cave opening are sealed by adopting oil sludge, the wood pressing strip is arranged corresponding to the boundary of the sound insulation sample, and the fastening clamp abuts against the wood pressing strip, so that the edge of the sound insulation sample is clamped by the wood pressing strip and the steel baffle plate from two sides. Therefore, the device can enable the small-size rectangular thin plate to be capable of achieving an approximate simply supported boundary in the sound insulation opening, is simple and convenient to operate, stable and controllable in sample boundary, and beneficial to greatly improving the sound insulation test efficiency and the repeatability and reproducibility of test results, and is particularly suitable for the sound insulation test process of the small-size material thin plate without clear use occasions.
Corresponding to the sound insulation testing device, the invention also provides a sound insulation testing method. The method embodiment of the present invention corresponds to the apparatus embodiment described above, and details that are not disclosed in the method embodiment may refer to the method embodiment described above, and are not described again in the present invention.
FIG. 10 is a flow diagram of a sound insulation testing method according to one embodiment of the present invention, as shown in FIG. 10, including the steps of:
and S1, uniformly installing positioning bolts on the wall along the edge of the sound insulation opening on one side of the sound source chamber.
And S2, mounting a fastening clamp on the positioning bolt through the through hole.
And S3, welding a steel baffle on the inner side wall surface of the sound insulation cave, and sticking a rubber gasket on the inner side of the steel baffle.
And S4, placing the sound insulation sample in the sound insulation opening, and sealing the edge of the sound insulation sample.
And S5, arranging a wood pressing strip corresponding to the boundary of the sound insulation sample, and pressing the fastening clamp against the wood pressing strip so that the edge of the sound insulation sample is clamped by the wood pressing strip and the steel baffle plate from two sides.
According to one embodiment of the invention, the sound insulation sample is a rectangular plate-shaped member with the side length less than or equal to 1m and the thickness less than or equal to 15 mm.
According to one embodiment of the invention, the positioning bolts are M16 bolts, the number of the positioning bolts is 12, and the positioning bolts are respectively arranged at each corner of the sound insulation cave and at the trisection point of each side of the sound insulation cave.
According to one embodiment of the invention, the number of the fastening clamps is 12, each fastening clamp is composed of a steel block 100mm multiplied by 40mm multiplied by 15mm and an M12 bolt, the steel block is provided with 1 phi 18 through hole and 1 phi 12 threaded hole, the fastening clamp is arranged at the positioning bolt through the phi 18 through hole, and the M12 bolt applies fastening pressure to the sound insulation sample through the phi 12 threaded hole.
According to one embodiment of the invention, the steel baffle plate is welded in the sound insulation cave opening 200mm away from one side of the sound source chamber, the size of the steel baffle plate is 20mm in width and 2mm in thickness, and the rubber gasket is 3 mm.
The number of the wood battens is 4, the cross-sectional dimension of the wood battens is 20mm multiplied by 20mm, the M12 bolts evenly support the wood battens, and 4N M pre-tightening torque is applied to each M12 bolt.
According to the sound insulation test method, the positioning bolts are evenly installed on the wall extending along the sound insulation hole on one side of the sound source chamber, the fastening clamp is installed on the positioning bolts through the through holes, the steel baffle is welded on the inner side wall surface of the sound insulation hole, the rubber liner is pasted on the inner side of the steel baffle, the sound insulation sample is placed in the sound insulation hole, the edge of the sound insulation sample is sealed, the wood pressing strip is arranged on the boundary corresponding to the sound insulation sample, and the fastening clamp abuts against the wood pressing strip, so that the edge of the sound insulation sample is clamped by the wood pressing strip and the steel baffle from two sides. Therefore, the method can enable the small-size rectangular thin plate to be capable of achieving an approximate simply supported boundary in the sound insulation opening, is simple and convenient to operate, stable and controllable in sample boundary, and beneficial to greatly improving the sound insulation test efficiency and the repeatability and reproducibility of test results, and is particularly suitable for the sound insulation test process of the small-size material thin plate without clear use occasions.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. The meaning of "plurality" is two or more unless specifically limited otherwise.
In the present invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the second feature or the first and second features may be indirectly contacting each other through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction. In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A sound insulation test device, comprising:
the sound insulation cave opening is arranged along one side wall of the sound source chamber;
the positioning bolts are uniformly installed along the wall extending along the edge of the sound insulation opening;
the fastening clamp is correspondingly installed at the positioning bolt through a through hole and is used for applying fastening pressure;
the steel baffle is welded on the inner side wall surface of the sound insulation cave, and a rubber gasket is adhered on the inner side of the steel baffle;
the sound insulation test sample is placed in the sound insulation cave opening, the edge of the sound insulation test sample props against the rubber gasket on the inner side of the steel baffle, and the sound insulation test sample and the sound insulation cave opening are sealed by adopting oil sludge;
the wood pressing strip is arranged corresponding to the boundary of the sound insulation sample, and the fastening clamp props against the wood pressing strip, so that the edge of the sound insulation sample is clamped by the wood pressing strip and the steel baffle from two sides.
2. The sound insulation test device according to claim 1, wherein the sound insulation sample is a rectangular plate-shaped member having a side length of 1m or less and a thickness of 15mm or less.
3. The sound insulation testing device of claim 2, wherein the positioning bolts are M16 bolts, and the number of the positioning bolts is 12, and the positioning bolts are respectively arranged at each corner of the sound insulation cave opening and at the trisection point of each side of the sound insulation cave opening.
4. The sound insulation test device of claim 3, wherein the number of the fastening clamps is 12, each fastening clamp is composed of a steel block of 100mm x 40mm x 15mm and an M12 bolt, and the steel block is provided with 1 phi 18 through hole and 1 phi 12 threaded hole, the fastening clamp is mounted at the positioning bolt through the phi 18 through hole, and the M12 bolt applies fastening pressure to the sound insulation test sample through the phi 12 threaded hole.
5. The sound insulation testing device of claim 1, wherein the steel baffle is welded in the sound insulation tunnel opening 200mm away from one side of the sound source chamber, the steel baffle has a width of 20mm and a thickness of 2mm, and the rubber gasket is a 3mm rubber gasket.
6. The sound insulation testing device of claim 4, wherein the number of the wood battens is 4, the cross-sectional dimension of the wood battens is 20mm x 20mm, the M12 bolts uniformly support the wood battens, and a pre-tightening torque of 4N-M is applied to each M12 bolt.
7. A sound insulation test method is characterized by comprising the following steps:
positioning bolts are uniformly arranged on the wall extending along the edge of the sound insulation opening on one side of the sound source chamber;
installing a fastening clamp on the positioning bolt through the through hole;
welding a steel baffle on the inner side wall surface of the sound insulation cave, and sticking a rubber gasket on the inner side of the steel baffle;
placing a sound insulation sample in the sound insulation opening, and sealing the edge of the sound insulation sample;
and arranging a wood pressing strip corresponding to the boundary of the sound insulation sample, wherein the fastening clamp props against the wood pressing strip so that the edge of the sound insulation sample is clamped by the wood pressing strip and the steel baffle plate from two sides.
8. The sound insulation test method according to claim 7, wherein the sound insulation sample is a rectangular plate-shaped member having a side length of 1m or less and a thickness of 15mm or less.
9. The sound insulation test method according to claim 8, wherein the positioning bolts are M16 bolts, and the number of the positioning bolts is 12, and the positioning bolts are respectively arranged at each corner of the sound insulation cave opening and at the trisection point of each side of the sound insulation cave opening.
10. The sound insulation test method according to claim 8, wherein the number of the fastening jigs is 12, each fastening jig is composed of a steel block of 100mm x 40mm x 15mm and an M12 bolt, and the steel block is provided with 1 through hole of phi 18 and 1 threaded hole of phi 12, the fastening jig is mounted at the positioning bolt through the through hole of phi 18, and the M12 bolt applies fastening pressure to the sound insulation test piece through the threaded hole of phi 12.
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