Device and method for testing sound insulation performance of test piece

Abstract

The invention discloses a device and a method for testing sound insulation performance of a test piece. The testing device comprises a fixing device, a first impedance tube, a second impedance tube and a loudspeaking assembly, each of the first impedance tube and the second impedance tube comprises a tube body and a sound transmission assembly arranged on the surface of the tube body; a fixing device is arranged between the first impedance tube and the second impedance tube and is used for fixing a test piece; one end of the second impedance tube far away from the fixing device is provided with a loudspeaking assembly, and one end of the first impedance tube far away from the fixing device is provided with a sealing cover; the fixing device adopts split type clamping and fixing, comprises two clamping pieces and a plurality of connecting pieces, and is used for fixing test pieces with different sizes; according to the testing device, by means of the fixing device, the first impedance tube, the second impedance tube and the loudspeaking assembly, sound insulation index testing of test pieces of different sizes can be met, and the testing precision is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of acoustic parameter testing, and in particular to a device and method for testing the sound insulation performance of a specimen. Background Art

[0002] The impedance tube is a standard test device used to test the sound insulation performance of small-sized sound insulation materials or structures. Its main body consists of two rigid-walled cylinders: the sound source tube and the test tube. The test sample is located on one side of the test tube, and two microphones are arranged on both sides of the sample to receive the plane wave sound pressure emitted by the sound source in the tube. After the sound wave reaches the surface of the test sample, part of the sound wave is reflected and absorbed, and the rest of the sound wave passes through the sample and is detected by the microphone behind the test sample. Finally, the sound insulation of the test sample can be calculated based on the transfer function method.

[0003] However, the geometric dimensions of the test piece are often inconsistent with the aperture size of the impedance tube, which makes it impossible to install and will affect the accuracy of the test. At the same time, the test piece contains non-metallic components, and the sound insulation performance is related to temperature. The effect of temperature on the sound insulation performance needs to be included in the research scope. At present, there are very few test devices that can provide a high-temperature sound insulation performance test environment for the test piece, and the test research can only be carried out by testing the samples in a high-temperature box. The above method not only has the problems of cumbersome operation, poor economy, and many uncontrollable factors, but the accuracy of the data obtained from the test is also unstable.

[0004] In summary, it is very important to design a sound insulation performance testing device that can test specimens of different sizes and enable the specimens to have a certain high temperature environment when testing the sound insulation performance. Summary of the invention

[0005] The purpose of the present invention is to provide a device and method for testing the sound insulation performance of a specimen. The testing device utilizes a fixing device, a first impedance tube, a second impedance tube and a speaker assembly to meet the sound insulation test of specimens of different sizes, thereby making the test accuracy higher.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a device for testing the sound insulation performance of a specimen, comprising: a fixing device, a first impedance tube, a second impedance tube and a speaker assembly; the first impedance tube and the second impedance tube both comprise a tube body and a sound transmission assembly arranged on the surface of the tube body; a fixing device is arranged between the first impedance tube and the second impedance tube for fixing the specimen; a speaker assembly is arranged at one end of the second impedance tube away from the fixing device, and a sealing cover is arranged at one end of the first impedance tube away from the fixing device; the fixing device is fixed by a split clamp, comprising two clamps and a plurality of connectors, for fixing specimens of different sizes.

[0007] Optionally, the testing device also includes an induction heating device and an infrared temperature sensor. The induction heating device is arranged around the fixing device to provide a controllable high temperature environment for the test piece; the infrared temperature sensor is arranged around the fixing device and is electrically connected to the induction heating device to test the temperature of the surface of the fixing device and feed back the temperature value to the induction heating device to control the heating temperature.

[0008] Optionally, the two clamps in the fixing device are arranged in a mirror-like manner, and both include a first connecting plate and a second connecting plate vertically connected to the first connecting plate; a hole matching the tube body is provided in the middle of the first connecting plate; the number of the second connecting plates is at least 2, and they are symmetrically arranged near the edge of the first connecting plate and parallel to the edge of the first connecting plate.

[0009] Optionally, a connecting piece parallel to the axial direction of the tube body is provided between the edges of the two first connecting plates; and a connecting piece is provided on the second connecting plate for fixing the second connecting plate to the test piece.

[0010] Optionally, the number of the connecting pieces parallel to the axial direction of the tube body is at least 2 and they are symmetrically arranged.

[0011] Optionally, the sound transmission component is two microphone sensors arranged axially along the surface of the tube body.

[0012] Optionally, the sound-speaking assembly includes a speaker, a sealing connector and a power amplifier, one side of the sealing connector is connected to the power amplifier, and the other side is connected to the tube body of the second impedance tube away from the fixing device; the speaker is arranged inside the sealing connector and connected to the power amplifier through the sealing connector.

[0013] Optionally, the induction heating device includes: a copper tube and a chassis; the chassis is connected to the copper tube and is used to provide current to the copper tube to make the copper tube heat up; the copper tube is evenly wrapped around the fixing device, and the copper tube is non-contact with the fixing device.

[0014] Optionally, a rubber gasket is provided at the connection between the fixing device and the first impedance tube or the second impedance tube.

[0015] In a second aspect, the present invention provides a testing method for the test piece sound insulation performance testing device according to the first aspect, characterized by comprising: Assemble the test setup and connect the output of the microphone assembly to the data logger; Place the test piece in the placement cavity of the fixture, adjust the position of the test piece, and fix it with the clamping parts and connecting parts of the fixture; Start the induction heating device to heat the copper tube, and indirectly heat the fixture and the test piece until the preset test temperature is reached; Start the sound-speaker component, collect the sound pressure through the sound-transmitting component, and calculate the sound insulation of the test piece by the transfer function method.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a test piece sound insulation performance test device and method. The test device is provided with a fixing device between a first impedance tube and a second impedance tube. The fixing device fixes the test piece by clamping, so that test pieces of different sizes can be tested for sound insulation, thereby improving the disadvantage that traditional impedance tubes cannot adapt to the test of test pieces of different sizes. The present invention provides a device and method for testing the sound insulation performance of a specimen. The testing device meets the requirement of providing a specific high-temperature environment for the specimen through the cooperation between a first impedance tube, a second impedance tube and a fixing device, combined with an infrared temperature sensor and an induction heating device outside the fixing device, thereby achieving the purpose of testing the sound insulation of specimens of different sizes in a specific high-temperature environment and improving the test accuracy of the sound insulation performance. The present invention provides a device and method for testing the sound insulation performance of a specimen. A rubber gasket is provided at the connection between the fixing device and the first impedance tube or the second impedance tube of the testing device. The rubber gasket plays a buffering role and to a certain extent isolates the temperature conduction from the specimen tooling to the impedance tube, thereby affecting the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Shown is a schematic structural diagram of a testing device (without induction heating equipment) in an embodiment of the present invention; Figure 2 The figure shows a schematic diagram of the structure of a first impedance tube in an embodiment of the present invention; Figure 3 The figure shows a schematic diagram of the structure of a second impedance tube in an embodiment of the present invention; Figure 4 Shown is a schematic diagram of the structure of a fixing device in an embodiment of the present invention; Figure 5 The figure shows a schematic diagram of the structure of the first connecting plate in an embodiment of the present invention; Figure 6 Shown is a schematic structural diagram of a testing device (with an induction heating device) in an embodiment of the present invention; Figure 7 The figure is a schematic diagram of a testing method flow in one embodiment of the present invention; 1. First impedance tube; 2. Second impedance tube; 3. Fixing device; 4. Induction heating device; 6. Microphone sensor; 7. Power amplifier; 8. Sealing connector; 9. Chassis; 10. Copper tube; 11. Bolt; 13. Tube body; 14. Sealing cover; 15. Clamp; 15-1. First connecting plate; 15-2. Second connecting plate. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may also include different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0020] In the description of the present invention, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0021] Example 1

[0022] The embodiment of the present invention introduces a test piece sound insulation performance testing device, such as Figure 1-7 As shown, it includes: a fixing device 3, a first impedance tube 1, a second impedance tube 2 and a speaker assembly; the first impedance tube 1 and the second impedance tube 2 both include a tube body 13 and a sound transmission assembly arranged on the surface of the tube body 13; a fixing device is arranged between the first impedance tube 1 and the second impedance tube 2 for fixing the test piece; the second impedance tube 2 is provided with a speaker assembly at one end away from the fixing device 3, and the first impedance tube 1 is provided with a sealing cover 14 at one end away from the fixing device 3; the fixing device 3 is fixed by a split clamp, including two clamps 15 and a plurality of connectors, which are used to fix test pieces of different sizes.

[0023] Specifically, the connecting member may be any detachable connecting member, and in this embodiment, the connecting members are all bolts; Specifically, Figure 2 and Figure 3 As shown, the first impedance tube 1 and the second impedance tube 2 both include a tube body 13, which is a tube with a circular cross-section and a rigid wall. The length of the tube is to ensure that at the lowest measurement frequency, at least one antinode and one node appear in the tube; a sound transmission component is also provided on the upper surface of the tube body 13, namely, two microphone sensors 6 distributed along the axial direction of the tube body 13. During the test, since the distance between the two microphone sensors 6 is known, the microphone sensor 6 is used to measure the standing wave ratio of the antinode and the node closest to the test piece, as well as the distance between the test piece and the first node, the acoustic impedance of the test piece material can be calculated.

[0024] Specifically, a support assembly is provided below the tube body 13 , and two support plates are used for support in this embodiment.

[0025] Specifically, Figure 2 As shown, a thread connected to a fixing device is provided at one end of the first impedance tube 1, and a sealing cover 14 is provided at the other end; in this embodiment, the sealing cover 14 has threads and is adapted to the port of the tube body 13 of the first impedance tube 1 to achieve sealing; in this embodiment, the sealing cover is made of aluminum.

[0026] Specifically, Figure 3 As shown, a thread connected to a fixing device is provided at one end of the second impedance tube 2, and a speaker assembly is provided at the other end, the speaker assembly includes a speaker, a sealing connector 8 and a power amplifier 7, and a thread matching the end of the tube body 13 of the second impedance tube 2 is provided on one side of the inside of the sealing connector 8, so as to achieve a threaded connection with the end of the second impedance tube 2 away from the fixing device 3; the other side of the sealing connector 8 is fixedly connected to the power amplifier 7 through two hollow tubes; the speaker is arranged inside the sealing connector 8 (not shown in the figure), and is connected to the power amplifier 7 by means of the gap in the middle of the hollow tube; in this embodiment, the size of the sound source (speaker 8) inside the sealing connector 8 can be controlled by the power amplifier 7, and the sound source generates a plane wave in the tube body 13, which is partially reflected at the test piece and forms a standing wave in front of it.

[0027] Specifically, Figure 4-Figure 5 As shown, the two clamping members 15 in the fixing device 3 are arranged in a mirror image, and both include a first connecting plate 15-1 and a second connecting plate 15-2; a hole matching the tube body 13 is provided in the middle of the first connecting plate 15-1, and a thread matching the tube body is attached to the hole, which is used to connect the fixing device 3 and the two impedance tubes; a connecting piece parallel to the axial direction of the tube body 13 is provided between the edges of the two first connecting plates 15-1; In this embodiment, the number of second connecting plates 15-2 is 4, and they are interconnected and arranged on the first connecting plate 15-1. Each second connecting plate 15-2 corresponds to each edge of the first connecting plate 15-1 one by one and is perpendicular to the first connecting plate 15-1. When the fixing device 3 is assembled, a accommodating space is formed between the two clamps 15 for placing the test piece. A connecting member is provided on the second connecting plate 15-2 for fixing the second connecting plate 15-2 and the test piece. In this embodiment, the connecting member is a bolt 11, and the first connecting plate 15-1 is also provided with four bolt holes for placing the bolts 11, and the four bolt holes are respectively arranged at the four corners of the first connecting plate 15-1; bolt holes for placing the bolts 11 may also be provided on the two symmetrical second connecting plates 15-2. During testing, the relative position of the test piece and the second connecting plate 15-2 is fixed by the bolts 11.

[0028] In this embodiment, a rubber gasket is provided at the connection between the fixing device 3 and the first impedance tube 1 or the second impedance tube 2. In this way, the rubber gasket is used to play a buffering role between the fixing device 3 and the two impedance tubes, and to a certain extent isolate the temperature conduction from the fixing device 3 to the two impedance tubes. At the same time, it has a sealing effect to prevent sound leakage from the gap, which is beneficial to the stability of the test accuracy.

[0029] In summary, the test device installs a fixing device 3 between the first impedance tube 1 and the second impedance tube 2. The fixing device 3 fixes the test piece by clamping, so that test pieces of different sizes can be tested for sound insulation, which improves the shortcoming that traditional impedance tubes cannot adapt to the testing of test pieces of different sizes and is beneficial to the stability of the test accuracy.

[0030] Example 2

[0031] like Figure 6 As shown, based on the test device for testing the sound insulation performance of a specimen introduced in Example 1, the test device further includes an induction heating device 4 and an infrared temperature sensor 5. The induction heating device 4 is arranged around the fixture 3 to provide a controllable high-temperature environment for the specimen; the infrared temperature sensor (shown in the figure) is arranged around the fixture 3 and is electrically connected to the induction heating device 4 to test the temperature of the surface of the fixture 3 and feed back the temperature value to the induction heating device 4 to control the heating temperature; In this embodiment, the induction heating device 4 includes: a copper tube 10 and a chassis 9; the chassis 9 is connected to the copper tube 10 and is used to provide current to the copper tube 10 to make the copper tube 10 heat up; the copper tube 10 is evenly wound around the fixing device, and the copper tube 10 is non-contact with the fixing device 3.

[0032] Specifically, during the test piece test, the chassis 9 is powered on to provide current to the copper tube 10. The copper tube 10 is wound according to the shape of the fixture 3, and the fixture 3 is heated by induction. The infrared temperature sensor 5 tests the surface temperature of the fixture 3, and feeds back the temperature value to the chassis 9. After reaching the preset temperature, the chassis 9 reduces the current to control the heating temperature. The induction device is arranged outside the fixture, and the induction heating method is adopted to heat the copper tube and the fixture in a non-contact manner. While the sound insulation test of the specimen is being carried out, the heating is carried out synchronously to achieve the purpose of providing an adjustable ambient temperature during the specimen test. Because the sound insulation performance of the materials of some specimens will change at different temperatures, the induction heating device and the fixture can provide a controllable high temperature environment during the specimen test.

[0033] In summary, the present invention provides a device and method for testing the sound insulation performance of a specimen. The testing device meets the requirement of providing a specific high-temperature environment for the specimen through the cooperation between the first impedance tube, the second impedance tube and the fixing device, combined with an infrared temperature sensor and an induction heating device outside the fixing device, and achieves the purpose of testing the sound insulation of specimens of different sizes in a specific high-temperature environment, thereby improving the test accuracy of the sound insulation performance. Example 3

[0034] The embodiment of the present invention introduces a test method of a test piece sound insulation performance test device based on the embodiment or embodiment 2, including: Step S1: assembling the test device and connecting the output end of the microphone assembly to the data acquisition device; Step S2: placing the test piece in the placement cavity of the fixture, adjusting the position of the test piece, and fixing it with the clamping piece and the connecting piece of the fixture; Step S3: starting the induction heating device to heat the copper tube, and indirectly heating the fixture and the test piece until a preset test temperature is reached; Step S4: Start the sound-speaking component, collect the sound pressure through the sound-transmitting component, and calculate the sound insulation of the test piece by the transfer function method.

[0035] Specifically, in step S4, the sound insulation of the test piece is calculated by the transfer function method according to the national standard GB / T18696.2-2002 "Measurement of sound absorption coefficient and acoustic impedance in impedance tubes Part 2: Transfer function method" and ISO10534-2:1998, which will not be described in detail here; The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which all fall within the protection of the present invention.

Claims

1. A test piece sound insulation performance testing device, characterized in that: include: A fixing device, a first impedance tube, a second impedance tube and a speaker assembly; the first impedance tube and the second impedance tube each include a tube body and a sound transmission assembly arranged on the surface of the tube body; a fixing device is arranged between the first impedance tube and the second impedance tube for fixing the test piece; the second impedance tube is provided with a speaker assembly at one end away from the fixing device, and a sealing cover is provided at one end of the first impedance tube away from the fixing device; the fixing device adopts a split clamping fixation, including two clamping parts and a plurality of connecting parts, for fixing test pieces of different sizes.

2. The test piece sound insulation performance testing device according to claim 1, characterized in that: The testing device also includes an induction heating device and an infrared temperature sensor. The induction heating device is arranged around the fixing device to provide a controllable high-temperature environment for the test piece; the infrared temperature sensor is arranged around the fixing device and is electrically connected to the induction heating device to test the temperature of the surface of the fixing device and feed back the temperature value to the induction heating device to control the heating temperature.

3. The test piece sound insulation performance testing device according to claim 1, characterized in that: The two clamps in the fixing device are arranged in a mirror image, and both include a first connecting plate and a second connecting plate vertically connected to the first connecting plate; a hole matching the tube body is provided in the middle of the first connecting plate; the number of the second connecting plates is at least 2, and they are symmetrically arranged near the edge of the first connecting plate and parallel to the edge of the first connecting plate.

4. The test piece sound insulation performance testing device according to claim 3, characterized in that: A connecting piece parallel to the axial direction of the tube body is provided between the edges of the two first connecting plates; a connecting piece is provided on the second connecting plate for fixing the second connecting plate to the test piece.

5. The test piece sound insulation performance testing device according to claim 4, characterized in that: The number of the connecting pieces parallel to the axial direction of the tube body is at least 2 and they are symmetrically arranged.

6. The test piece sound insulation performance testing device according to claim 1, characterized in that: The sound transmission component is two microphone sensors arranged axially along the surface of the tube body.

7. The test piece sound insulation performance testing device according to claim 1, characterized in that: The speaker assembly includes a speaker, a sealing connector and a power amplifier. One side of the sealing connector is connected to the power amplifier, and the other side is connected to the tube body of the second impedance tube away from the fixing device. The speaker is arranged inside the sealing connector and connected to the power amplifier through the sealing connector.

8. The test piece sound insulation performance testing device according to claim 1, characterized in that: The induction heating device comprises: a copper tube and a chassis; the chassis is connected to the copper tube and is used to provide current to the copper tube to make the copper tube heat up; the copper tube is evenly wound around a fixing device, and the copper tube is non-contacting with the fixing device.

9. The test piece sound insulation performance testing device according to claim 1, characterized in that: A rubber gasket is provided at the connection between the fixing device and the first impedance tube or the second impedance tube.

10. The testing method of the test piece sound insulation performance testing device according to any one of claims 1 to 9, characterized in that: include: Assemble the test setup and connect the output of the microphone assembly to the data logger; Place the test piece in the placement cavity of the fixture, adjust the position of the test piece, and fix it with the clamping parts and connecting parts of the fixture; Start the induction heating device to heat the copper tube, and indirectly heat the fixture and the test piece until the preset test temperature is reached; Start the sound-speaker component, collect the sound pressure through the sound-transmitting component, and calculate the sound insulation of the test piece by the transfer function method.

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