Portable sound insulation performance testing device and testing method thereof

Abstract

The invention relates to the technical field of sound insulation performance testing, and discloses a portable sound insulation performance testing device and a testing method thereof.The portable sound insulation performance testing device comprises a box body, a supporting assembly, a sound production unit, a sound level meter assembly and a dynamic signal tester; the supporting assembly is installed on the box body, a plate to be tested is installed on the supporting assembly, and the box body is divided into a sound source chamber and a receiving chamber; the sound production unit is mounted in the sound source chamber; the sound source chamber and the receiving chamber are internally provided with sound level meter assemblies used for collecting noise signals. And the dynamic signal tester is arranged outside the box body, is connected with the sound level meter assembly through a high-speed signal line assembly, and is used for receiving a signal of the sound level meter assembly. The device is simple in principle, convenient to install and easy to operate, the sound insulation testing efficiency can be greatly improved, and the testing energy consumption and cost are reduced.

Description

Technical Field

[0001] This invention belongs to the field of sound insulation performance testing technology, specifically relating to a portable sound insulation performance testing device and its testing method. Background Technology

[0002] Sound insulation performance has gradually become a core indicator of building quality. Building renovations and the development of new sound insulation materials due to substandard sound insulation will lead to a surge in demand for sound insulation testing. However, traditional sound insulation testing methods rely on standard laboratory environments, which are costly to build and complex to operate. The current technological gap between outdated sound insulation technologies and new regulatory requirements will result in significant energy consumption and resource waste, increasing carbon emissions throughout the building's lifecycle. Against this backdrop, there is an urgent need to overcome this technological bottleneck through the development of sound insulation performance testing technologies for building materials, achieving synergistic development between noise reduction and energy conservation / carbon reduction. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a portable sound insulation performance testing device and method. This invention features a simple device that is easy to install, solves the problems of high cost and complex operation in traditional testing methods, and significantly improves on-site testing efficiency.

[0004] This invention provides the following technical solution: In one aspect, a portable sound insulation performance testing device is provided, including a housing, a support component, a sound generating unit, a sound level meter component, and a dynamic signal tester; The support component is installed on the enclosure, the test plate is installed on the support component, and the enclosure is divided into a sound source chamber and a receiving chamber; The sound-generating unit is installed in the sound source chamber; Both the sound source chamber and the receiving chamber are equipped with sound level meter components for collecting noise signals; The dynamic signal tester is installed outside the enclosure and connected to the sound level meter assembly via a high-speed signal line assembly to receive signals from the sound level meter assembly.

[0005] Furthermore, the support component includes a support member and a clamping member. The support member is provided with a plurality of first through holes, the clamping member is provided with a plurality of second through holes, and the housing is provided with an array of third through holes and a plurality of fourth through holes. The supporting member is installed on the housing by bolts passing through the first through hole and the third through hole; the clamping member is installed on the housing by bolts passing through the second through hole and the fourth through hole. The plate to be tested is installed between the supporting member and the clamping member; Furthermore, the third through hole is a circular through hole, and the fourth through hole is an oblong through hole.

[0006] In the above technical solution, based on the size information of the plate to be tested, the support component can be adjusted up and down through the array of the third through holes during installation, and the clamping component can also be adjusted up and down within the waist-shaped hole of the fourth through hole. The waist-shaped hole can allow for manufacturing errors of the plate to be tested, so as to achieve support and clamping of plates of different thicknesses.

[0007] Furthermore, the supporting member is provided with a fifth through hole, the clamping member is provided with a sixth through hole, and the plate to be tested is fixed by bolts passing through the fifth through hole and the sixth through hole.

[0008] Furthermore, the sound level meter assembly includes a first sound level meter and a second sound level meter, and the housing is also provided with a first cable outlet and a second cable outlet. The high-speed signal line assembly includes a first high-speed signal line and a second high-speed signal line. One end of the first high-speed signal line is connected to the first sound level meter in the sound source chamber through the first cable outlet, and the other end is connected to the dynamic signal tester. One end of the second high-speed signal line is connected to the second sound level meter in the receiving chamber through the second cable outlet, and the other end is connected to the dynamic signal tester.

[0009] Furthermore, the inner wall of the box is provided with a sound-absorbing layer.

[0010] Furthermore, the thickness of the sound-absorbing layer is 10~30 mm.

[0011] In the above technical solution, the thickness of the sound-absorbing layer is adjusted according to the size of the test panel to mitigate the impact of environmental noise and the inner wall of the chamber on the test results.

[0012] Furthermore, the length and width of the test plate are 280~320 mm, and the thickness is 10~50 mm.

[0013] Secondly, a method for testing sound insulation performance is provided, employing the portable sound insulation performance testing device described in any one of the first aspects, comprising the following steps: The supporting components and the test plate are installed in a box with a sound-absorbing layer. The test plate divides the internal part of the box into a sound source chamber and a receiving chamber. The sound-generating unit is installed in the sound source chamber, and the sound level meter assembly is installed in the sound source chamber and the receiving chamber respectively, and connected to the dynamic signal tester; When the sound-generating unit is activated, the sound level meter component collects noise signals from the sound source chamber and the receiving chamber, and transmits them to the dynamic signal tester through the high-speed signal line component. The dynamic signal tester receives and obtains the time-domain signals of noise sound pressure before and after sound insulation. Based on the time-domain signal, the sound insulation of the test panel in each standard frequency band is calculated, and the average sound insulation or weighted sound insulation is further calculated.

[0014] Furthermore, the step of calculating the sound insulation of the test panel in each standard frequency band based on the time-domain signal includes: programming based on the MATLAB platform and using Fourier transform to convert the time-domain signals of noise sound pressure before and after sound insulation. L 1 (t) and L 2 (t) Convert to frequency domain signal L 1 (f) and L 2 (f) The root mean square values ​​of the sound pressure level in each standard frequency band of the test plate were calculated. L 1 ' ( f i )and L 2 ' ( f i This forms a 1 / 3 octave band spectrum or a 1 octave band spectrum, and the sound insulation of each standard frequency band... R ( f i )for L 1 ' ( f i )and L 2 ' ( f i The difference between ).

[0015] Compared with the prior art, the beneficial effects of the present invention are: (1) This invention provides a portable sound insulation performance testing device and its testing method, which is easy to carry and transport. It can be assembled according to the needs of the testing environment and test materials. It is easy to assemble and easy to disassemble and repair, effectively reducing the dependence of building material sound insulation performance testing on professional laboratory environment and complex equipment. Combined with the test method formulated by the building sound insulation evaluation standard GB / T50121-2005, the test process is simple and convenient. Based on the sound pressure meter and dynamic signal tester, it can be programmed through the MATLAB platform to quantify each frequency band, output the sound insulation of each standard frequency band, and further obtain the average sound insulation or weighted sound insulation, thereby more accurately evaluating the sound insulation effect of the test material on noise in each frequency band, and the test results are more authentic and accurate. (2) The device and testing method of the present invention are simple in principle and easy to operate, which greatly improves the sound insulation testing efficiency and reduces the testing energy consumption and cost. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the external structure of the portable building material sound insulation performance testing device according to Embodiment 2 of the present invention; Figure 2 This is a structural schematic diagram of the box portion in the unfolded state of Embodiment 2 of the present invention (excluding the sound-absorbing layer). Figure 3 A schematic diagram of the internal structure of the enclosure in Embodiment 2 of the present invention (excluding the sound-absorbing layer); Figure 4 This is a schematic diagram of the installation of the support component in Embodiment 2 of the present invention: (a) before the support component is installed; (b) after the support component is installed. Figure 5 This is a front view of the structure of the portable building material sound insulation performance testing device according to Embodiment 2 of the present invention; Figure 6 This is a schematic diagram of the internal structure of the enclosure (including the sound-absorbing layer) according to Embodiment 2 of the present invention. Figure 7 The sound pressure level curve for testing the sound insulation performance of EPS foamed cement mortar in Example 4 of this invention; Figure 8 The sound insulation of EPS foamed cement mortar in Example 4 of this invention is the standard frequency band sound insulation of 1 / 3 octave band. Figure 9 The sound pressure level curve for the sound insulation performance test of vermiculite cement mortar in Example 5 of the present invention; Figure 10 The sound insulation of the vermiculite cement mortar in Embodiment 5 of the present invention is the standard frequency band sound insulation of 1 / 3 octave band. Figure 11 The average sound insulation of the two types of cement mortar in Examples 4-5 of the present invention are: (a) EPS foamed cement mortar; (b) vermiculite cement mortar.

[0017] The following are labeled in the diagram: 1. Cabinet; 11. Front panel; 12. Back panel; 121. First cable outlet; 122. Second cable outlet; 13. Left side panel; 131. Third through hole; 132. Fourth through hole; 14. Right side panel; 15. Top panel; 16. Bottom panel; 2. Sound-absorbing layer; 31. Supporting component; 311. First through hole; 32. Clamping component; 321. Second through hole; 4. Test material; 5. Sound-generating unit; 61. First sound level meter; 62. Second sound level meter; 631. First high-speed signal line; 632. Second high-speed signal line; 7. Dynamic signal tester. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0019] It should be noted that in the description of this invention, the terms "front", "rear", "left", "right", "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and do not require that this invention must be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0020] In the description of this invention, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0021] Example 1

[0022] This embodiment provides a portable sound insulation performance testing device, including a housing 1, a support component, a sound generating unit 5, a sound level meter component, and a dynamic signal tester 7; The support components are installed on the enclosure 1 covered with the sound-absorbing layer 2. The two ends of the test plate 4 are overlapped and installed on the support components, and the internal space of the enclosure 1 is divided into a sound source chamber and a receiving chamber. Sound generating unit 5 is installed in the sound source chamber; Both the sound source chamber and the receiving chamber are equipped with sound level meter components for collecting noise signals; The dynamic signal tester 7 is installed outside the enclosure 1 and is connected to the sound level meter assembly via a high-speed signal line assembly to receive signals from the sound level meter assembly.

[0023] Example 2

[0024] This embodiment provides a portable sound insulation performance testing device based on embodiment 1, including a housing 1, a support component, a test plate 4, a sound generating unit 5, a sound level meter component, and a dynamic signal tester 7.

[0025] like Figures 1-3 This is a schematic diagram of the internal structure of the enclosure without a sound-absorbing layer. In this embodiment, the enclosure 1 is a hexahedral thin-walled structure, enclosed by six sides: a front panel 11, a back panel 12, a left side panel 13, a right side panel 14, a top panel 15, and a bottom panel 16. The front panel 11 and the top panel 15 are connected to the left side panel 13 via hinges. In this embodiment, the enclosure 1 is made of stainless steel. The length and width of the enclosure 1 are 320 mm, the height is 600 mm, the wall panel thickness is 3 mm, the weight is approximately 22.76 kg, and the floor area is approximately 0.1 m². 2 It occupies approximately 0.06 m of space. 3The internal cavity of the enclosure 1 is used for testing sound insulation performance. A dynamic signal tester 7 is installed externally, connected to a sound level meter assembly installed inside via a high-speed signal cable to receive signals from the sound level meter assembly. The enclosure has an array of third through holes 131 and multiple fourth through holes 132. In this embodiment, the left side plate 13 and the right side plate 14 are symmetrically arranged with arrays of third through holes 131 and two fourth through holes 132. The third through holes 131 are arranged in a 9×3 array. The third through holes 131 adopt... φ The array of circular through holes is 5 mm in diameter. The fourth through hole 132 is a vertical waist-shaped through hole with a width of 5 mm. The waist-shaped hole can allow for the dimensional error of the test plate 4 and is suitable for testing test plates 4 of different thicknesses.

[0026] like Figures 2-3 As shown, the support assembly includes a support member 31 and a clamping member 32. The support member 31 is installed on the lower part of the plate to be tested 4 to support the plate to be tested 4, and the clamping member 32 is installed on the upper part of the plate to be tested 4 to clamp the plate to be tested 4. In this embodiment, both the support member 31 and the clamping member 32 are made of 0.04 m equilateral angle steel and have a length of 0.3 m. The side of the support member 31 that contacts the housing 1 is provided with a first through hole 311, which corresponds to the array of third through holes 131 provided on the housing 1. In this embodiment, the first through hole 311 is made of... φ A 5 mm circular through hole, through which the support member 31 passes between the first through hole 311 and the third through hole 131. φ A 5 mm positioning bolt is fastened to the housing 1; a second through hole 321 is provided on the side of the clamping member 32 that contacts the housing 1, and the second through hole 321 corresponds to the fourth through hole 132 on the housing 1. In this embodiment, the second through hole 321 adopts... φ A 5 mm circular through hole, the clamping member 32 passes through the second through hole 321 and the fourth through hole 132. φ The 5mm positioning bolts are fastened to the housing 1.

[0027] like Figure 4 As shown, this embodiment provides an installation method for a support component. Before the support component is installed, the array of third through holes 131 and fourth through holes 132 on the housing 1 are staggered. When installing the support component, the first through hole 311 on the support member 31 corresponds to the third through hole 131 on the housing 1 and is fixed, and the second through hole 321 on the clamping member 32 corresponds to the fourth through hole 132 on the housing 1. According to the size of the plate 4 to be tested, the first through hole 311 and the second through hole 321 can be adjusted up and down on the third through hole 131 and the fourth through hole 132, respectively.

[0028] like Figure 5As shown, the test plate 4 is mounted on the support member 31 with its two ends overlapping, and is fixed by the clamping member 32. The test plate 4 divides the internal space of the housing 1 into a sound source chamber and a receiving chamber. In this embodiment, the upper area of ​​the test plate 4 is the sound source chamber, and the lower area is the receiving chamber. In some embodiments, the positions of the sound source chamber and the receiving chamber can be interchanged to simulate the impact of downstairs noise on upstairs noise. In some embodiments, the length and width of the test plate 4 are 280~320 mm, and the thickness is 10~50 mm, which can be replaced according to the testing requirements.

[0029] like Figure 5 As shown, the sound-generating unit 5 is installed in the sound source chamber. In this embodiment, the sound-generating unit 5 is installed on the test plate 4, and the sound-generating unit 5 can simulate common building noises such as knocking and vibration. In some embodiments, the sound-generating unit can be installed on the side wall of the enclosure 1 to simulate the impact of upstairs side wall construction on the downstairs. In addition, in some embodiments, the enclosure 1 can be laid flat to simulate the impact of noise from the adjacent room. In this embodiment, the sound level meter assembly includes a first sound level meter 61 installed in the sound source chamber and a second sound level meter 62 installed in the receiving chamber. The sound source chamber has a first outgoing hole 121 and a second outgoing hole 122 on the back plate 12 of the housing 1. One end of the first high-speed signal line 631 extends into the sound source chamber through the first outgoing hole 121 and is connected to the first sound level meter 61, while the other end is connected to the dynamic signal tester 7. The first sound level meter 61 is used to collect the noise signal in the sound source chamber and transmit it to the dynamic signal tester 7 through the first high-speed signal line 631. One end of the second high-speed signal line 632 extends into the receiving chamber through the second outgoing hole 122 and is connected to the second sound level meter 62, while the other end is connected to the dynamic signal tester 7. The second sound level meter 62 is used to collect the noise signal in the receiving chamber and transmit it to the dynamic signal tester 7 through the second high-speed signal line 632.

[0030] In this embodiment, the sound-generating unit 5 is used to simulate the generation of knocking noise at a frequency of 4 times per second; the first sound level meter 61 and the second sound level meter 62 have a range of 15~140 dB, can continuously collect noise signals, and transmit the data to computer processing software; the dynamic signal tester 7 has 8 channels and can achieve a maximum sampling frequency of 1 MHz.

[0031] like Figure 6 As shown, the inner wall of the enclosure 1 is also lined with a sound-absorbing layer 2. In this embodiment, the sound-absorbing layer 2 is made of sound-absorbing cotton, with a thickness of 10~30 mm. It can be adapted to test plates 4 of different sizes by cutting and splicing. The sound-absorbing layer 2 is adhered to the inner wall of the enclosure 1 with adhesive backing to reduce the influence of environmental noise on the test results. In addition, the sound-absorbing layer 2 located at the positions of the third through holes 131 and 132 on the enclosure 1 can reduce the influence of external noise to a certain extent.

[0032] Example 3

[0033] This embodiment 3, based on the portable sound insulation performance testing device of embodiments 1-2, provides a sound insulation performance testing method, which specifically includes the following steps: Before the installation and testing of the test panel 4, the sound-absorbing layer 2 is laid on the inner wall of the box 1. The thickness of the sound-absorbing layer 2 is adjusted according to the size of the test panel 4.

[0034] The support component 3 and the test plate 4 are installed in the box 1 covered with the sound-absorbing layer 2. The test plate 4 divides the internal cavity of the box 1 into a sound source chamber and a receiving chamber. Install the sound-generating unit 5 in the sound source chamber, install the sound level meter assembly in the sound source chamber and the receiving chamber respectively, and connect it to the dynamic signal tester 7; When the sound-generating unit 5 is activated, the sound level meter assembly collects noise signals from the sound source chamber and the receiving chamber, and transmits them to the dynamic signal tester 7 via a high-speed signal line assembly. The dynamic signal tester 7 receives the noise signal from the sound level meter assembly and obtains the time-domain signal of the noise sound pressure before and after sound insulation. L 1 (t) and L 2 (t) ; Based on time domain signal L 1 (t) and L 2 (t) Calculate the sound insulation of the test panel 4 in each standard frequency band. R ( f i ), and then calculate the average sound insulation. R Or weighted sound insulation R W .

[0035] The step of calculating the sound insulation of the test panel 4 in each standard frequency band based on the time-domain signal includes: programming based on the MATLAB platform and using Fourier transform to convert the time-domain signals of noise sound pressure before and after sound insulation. L 1 (t) and L 2 (t) Convert to frequency domain signal L 1 (f) and L 2 (f) Based on the specifications and referring to the building sound insulation evaluation standard GB / T50121-2005, MATLAB was used to calculate the root mean square values ​​of the sound pressure level of the tested panel in each standard frequency band.L 1 '(fi) and L 2 '(fi) This forms a 1 / 3 octave band spectrum or a 1 octave band spectrum, and the sound insulation amount... R(fi) for L 1 '(fi) and L 2 '(fi) The difference is used to characterize the sound insulation performance of the tested board material 4 for noise in different frequency bands, and further outputs the average sound insulation or weighted sound insulation. R w As a single-value evaluation metric for the sound insulation performance of building materials.

[0036] Example 4

[0037] This embodiment is based on the portable sound insulation performance testing device and testing method of embodiments 1 to 3. The test board 4 is made of EPS foamed cement mortar material, and its sound insulation performance is tested.

[0038] Before laying the test board 4, the sound-absorbing layer 2 is laid on the inner wall of the box 1. The sound-absorbing layer 2 is a layer of sound-absorbing cotton.

[0039] In this embodiment, the EPS foamed cement mortar material is made into a rectangular test plate with a length and width of 300 mm and a thickness of 30 mm.

[0040] Select the fifth horizontal row of through holes (middle position) in the array of third through holes 131 of the enclosure 1. The positioning bolt passes through the third through hole 131 of the enclosure 1 and the first through hole 311 of the support member 31, and fastens the support member 31 to the side plate of the enclosure 1. The two ends of the plate to be tested 4 are overlapped on the support member 31. The height of the clamping member 32 is adjusted according to the thickness of the plate to be tested 4. The positioning bolt passes through the fourth through hole 132 of the enclosure 1 and the second through hole 321 of the clamping member 32, and fastens the clamping member 32 to the side plate of the enclosure 1. The plate to be tested 4 is fixed between the support member 31 and the clamping member 32, thereby dividing the internal cavity of the enclosure 1 into a sound source chamber and a receiving chamber.

[0041] The sound-generating unit 5 is installed in the sound source chamber. In this embodiment, the sound-generating unit 5 is installed on the test plate 4. The first sound level meter 61 and the second sound level meter 62 are installed in the sound source chamber and the receiving chamber, respectively. They are connected to the dynamic signal tester 7 outside the box 1 by a high-speed signal line assembly through the first outlet hole 121 and the second outlet hole 122 of the box 1.

[0042] The sound-generating unit 5 is activated to generate common building noise. Noise signals from the source room and the receiving room are collected by the first sound level meter 61 and the second sound level meter 62, respectively. The signals are then transmitted to the dynamic signal tester 7 via a high-speed signal line assembly to obtain the time-domain signals of the noise sound pressure before and after sound insulation. L 1 (t) and L 2 (t) .

[0043] This paper implements sound insulation performance quantification using MATLAB platform programming, and transforms the time-domain signal using Fourier transform. L 1 (t) and L 2 (t) Convert to frequency domain signal L 1 (f) and L 2 (f) Based on the specifications and referring to the building sound insulation evaluation standard GB / T50121-2005, the root mean square value of the sound pressure level in the standard frequency band was calculated using MATLAB. L 1 '(fi) and L 2 '(fi) This forms a 1 / 3 octave band spectrum, outputting the sound insulation of building materials in each standard frequency band. R(fi) = L 1 '(fi)-L 2 '(fi) This further outputs the average sound insulation.

[0044] The results are as follows Figures 7-8 and Figure 11 As shown, this embodiment successfully detects the signal and average sound insulation before and after noise using the device and method of the present invention, demonstrating the feasibility of the device and method provided by the present invention.

[0045] like Figure 7 As shown, the sound pressure in the receiving chamber is significantly lower than that in the sound source chamber, indicating that the ESP foamed cement mortar material has a certain sound insulation effect.

[0046] like Figure 8As shown, ESP foamed cement mortar material has positive sound insulation values ​​in 10 frequency bands with center frequencies of 125 Hz, 200 Hz, 250 Hz, 500 Hz, 800 Hz, 1250 Hz, 1600 Hz, 2000 Hz, 2500 Hz and 3150 Hz, which can effectively insulate noise in these frequency bands, especially high-frequency noise.

[0047] like Figure 11 As shown, the average sound insulation of the EPS foamed cement mortar material provided in this embodiment is 6.23 dB.

[0048] Example 5

[0049] This embodiment is based on the portable sound insulation performance testing device and testing method of Embodiments 1 to 3. The test board 4 is made of vermiculite cement mortar material, and its sound insulation performance is tested using the testing method of Embodiment 4.

[0050] The results are as follows Figures 9-10 As shown, the sound pressure in the receiving chamber is significantly lower than that in the sound source chamber, indicating that the vermiculite cement mortar material has a certain sound insulation effect. The sound insulation of the vermiculite cement mortar material is positive in 13 frequency bands with center frequencies of 100 Hz, 160 Hz, 200 Hz, 250 Hz, 315 Hz, 400 Hz, 500 Hz, 630 Hz, 1250 Hz, 1600 Hz, 2000 Hz, 2500 Hz and 3150 Hz, which can play a sound insulation role for most frequency band noise, especially for high frequency noise.

[0051] like Figure 11 As shown, the average sound insulation of the vermiculite cement mortar material provided in this embodiment is 8.52 dB. Compared with Embodiment 4, the average sound insulation of the vermiculite cement mortar material in this embodiment is better than that of the EPS foam cement mortar material, indicating that the sound insulation performance of the vermiculite cement mortar material is better.

[0052] The portable sound insulation performance testing device provided by this invention has a simple structure and is easy to install. The installation materials used are readily available and have low cost. It is suitable for various testing sites. Combined with a dynamic signal tester, it effectively realizes the quantification of sound insulation performance at various frequency bands based on MATLAB platform programming. It solves the problems of high cost and complicated operation of traditional testing, significantly improves on-site testing efficiency, and provides a convenient testing method for the research and development and acceptance of building sound insulation materials.

[0053] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A portable sound insulation performance testing device, characterized in that, Includes enclosure (1), support components, sound generating unit (5), sound level meter components and dynamic signal tester (7); The support component is installed on the enclosure (1), the test plate (4) is installed on the support component, and the enclosure (1) is divided into a sound source chamber and a receiving chamber; The sound-generating unit (5) is installed in the sound source chamber; Both the sound source chamber and the receiving chamber are equipped with sound level meter components for collecting noise signals; The dynamic signal tester (7) is installed outside the housing (1) and connected to the sound level meter assembly via a high-speed signal line assembly to receive signals from the sound level meter assembly.

2. The portable sound insulation performance testing device according to claim 1, characterized in that, The support component includes a support member (31) and a clamping member (32). The support member (31) is provided with a plurality of first through holes (311), the clamping member (32) is provided with a plurality of second through holes (321), and the housing (1) is provided with an array of third through holes (131) and a plurality of fourth through holes (132). The supporting member (31) is installed on the housing (1) by bolts passing through the first through hole (311) and the third through hole (131); the clamping member (32) is installed on the housing (1) by bolts passing through the second through hole (321) and the fourth through hole (132); The plate to be tested (4) is installed between the support member (31) and the clamping member (32).

3. The portable sound insulation performance testing device according to claim 2, characterized in that, The third through hole (131) is a circular through hole, and the fourth through hole (132) is an oblong through hole.

4. The portable sound insulation performance testing device according to claim 2, characterized in that, The supporting member (31) is provided with a fifth through hole (312), the clamping member (32) is provided with a sixth through hole (322), and the plate to be tested (4) is fixed by bolts passing through the fifth through hole (312) and the sixth through hole (322).

5. The portable sound insulation performance testing device according to claim 1, characterized in that, The sound level meter assembly includes a first sound level meter (61) and a second sound level meter (62). The housing (1) is provided with a first outlet hole (121) and a second outlet hole (122). The high-speed signal line assembly includes a first high-speed signal line (631) and a second high-speed signal line (632). One end of the first high-speed signal line (631) is connected to the first sound level meter (61) in the sound source room through the first outlet hole (121), and the other end is connected to the dynamic signal tester (7). One end of the second high-speed signal line (632) is connected to the second sound level meter (62) in the receiving room through the second outlet hole (122), and the other end is connected to the dynamic signal tester (7).

6. The portable sound insulation performance testing device according to claim 1, characterized in that, The inner wall of the enclosure (1) is provided with a sound-absorbing layer (2).

7. The portable sound insulation performance testing device according to claim 6, characterized in that, The thickness of the sound-absorbing layer (2) is 10~30 mm.

8. The portable sound insulation performance testing device according to claim 1, characterized in that, The length and width of the test plate (4) are 280~320 mm and the thickness is 10~50 mm.

9. A method for testing sound insulation performance, characterized in that, The portable sound insulation performance testing device according to any one of claims 1 to 8 includes the following steps: The supporting components and the test plate (4) are installed inside the box (1), and the test plate (4) divides the inside of the box (1) into a sound source chamber and a receiving chamber. Install the sound generating unit (5) in the sound source chamber, install the sound level meter assembly in the sound source chamber and the receiving chamber respectively, and connect it to the dynamic signal tester (7). Start the sound generating unit (5), the sound level meter component collects the noise signals of the sound source room and the receiving room, and transmits them to the dynamic signal tester (7) through the high-speed signal line component. The dynamic signal tester (7) receives and obtains the time domain signal of the noise sound pressure before and after sound insulation. Based on the time domain signal, the sound insulation of the test board (4) in each standard frequency band is calculated, and the average sound insulation or weighted sound insulation is further calculated.

10. The sound insulation performance testing method according to claim 1, characterized in that, The calculation of the sound insulation of the test board (4) in each standard frequency band based on the time-domain signal includes: programming based on the MATLAB platform, and converting the time-domain signals of noise pressure before and after sound insulation into Fourier transform. L 1 (t) and L 2 (t) Convert to frequency domain signal L 1 (f) and L 2 (f) The root mean square values ​​of the sound pressure level of the test plate (4) in each standard frequency band were calculated. L 1 ' ( f i )and L 2 ' ( f i This forms a 1 / 3 octave band spectrum or a 1 octave band spectrum, and the sound insulation of each standard frequency band... R ( f i )for L 1 ' ( f i )and L 2 ' ( f i The difference between ).

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