Acoustic vibration control material damping performance testing device based on dynamic stiffness method

Abstract

The utility model relates to an acoustic vibration control material damping performance testing device based on a dynamic stiffness method. The acoustic vibration control material damping performance testing device comprises an excitation module, a clamp position adjusting module, a sample piece testing and mounting module, a data acquisition and analysis module and a support. The method comprises the following steps: taking an acoustic vibration control material as a test object, performing standardized sample preparation according to sample preparation requirements, and stably mounting a sample on a sample testing and mounting module; the excitation module controls excitation amplitude and excitation frequency and excites the sample piece to vibrate, and force and displacement signals acting on the sample piece are obtained through the data acquisition and analysis module; the obtained test result is solved, damping-related dynamic mechanical property results such as complex modulus and loss factor of the material are obtained in combination with the shape factor of the sample, and guidance and reference can be provided for optimization design and engineering application of the acoustic vibration control material. Compared with the prior art, the device disclosed by the utility model can be suitable for testing the damping performance of the acoustic vibration control material in different stress states (stretching, compressing, shearing and the like).

Description

Technical Field

[0001] The utility model relates to the technical field of material dynamic parameter testing, in particular to a device for testing damping performance of acoustic vibration control materials based on a dynamic stiffness method. Background Art

[0002] Due to the different, complex and even extreme service conditions in various fields, acoustic vibration control materials with specific properties are required to achieve the required acoustic vibration control effect. However, the existing acoustic vibration control material damping performance test and evaluation methods are not unified, and there is a certain deviation between the test results and the actual engineering application effects. It is urgent to accurately evaluate the damping performance of different acoustic vibration control materials. Therefore, building a comprehensive test and analysis bench that meets different stress states (tension, compression, shear, etc.) at the same time has great scientific research and engineering practical application significance.

[0003] The dynamic stiffness method obtains the complex modulus and loss factor of the material by analyzing the phase difference between excitation and response. The amplitude, frequency, and temperature correlation curves of the complex modulus and loss factor of the material can be obtained through different excitation amplitude, frequency, and temperature test conditions. The international standard ISO 18437-4-2005 "Mechanical vibration and shock characterization of dynamic mechanical properties of viscoelastic materials Part 4: Dynamic stiffness method" stipulates the test process, test principle, and relevant parameter requirements of the components of the dynamic stiffness method, but does not make relevant provisions for the specific implementation method of the test device.

[0004] The existing principles for testing and evaluating the damping performance of acoustic vibration control materials are quite diverse. In the utility model patent with publication number CN111458288A, a material damping property testing device based on the cantilever beam method and the free beam method is proposed. The basic principle is the half-power method, which can only obtain the Young's modulus and corresponding loss factor value of the material under the tensile stress state; in the utility model patent with publication number DE102015203561A1, a test method for the Young's modulus, shear modulus and corresponding loss factor of the material under the tensile and shear stress states is proposed, and the bulk modulus and the corresponding loss factor test method are not involved.

[0005] Therefore, the more common testing methods currently have certain limitations, and there is a lack of a set of testing devices for the damping performance of acoustic vibration control materials that are suitable for meeting different stress states (tension, compression, shear, etc.). Utility Model Content

[0006] The purpose of the utility model is to overcome the defects of the above-mentioned prior art and to provide a damping performance test device for acoustic vibration control materials based on the dynamic stiffness method, which can obtain damping-related dynamic mechanical performance results such as the complex modulus and loss factor of materials under different frequencies, temperatures and vibration amplitudes and different deformation states. It is a damping performance test device for acoustic vibration control materials based on the dynamic stiffness method that meets the international standard ISO18437-4-2005 "Characterization of dynamic mechanical properties of viscoelastic materials for mechanical vibration and impact Part 4: Dynamic stiffness method".

[0007] The purpose of the utility model can be achieved through the following technical solutions:

[0008] The utility model aims to provide a device for testing the damping performance of acoustic vibration control materials based on a dynamic stiffness method, wherein the device comprises an excitation module, a fixture position adjustment module, a sample testing and installation module, a data acquisition and analysis module, and a support.

[0009] Furthermore, the excitation module is used to drive the sample to vibrate; the fixture position adjustment module is used to adjust the fixture position to meet the requirements of different fixture tests; the sample testing and installation module includes a fixture, and the fixture is installed between the excitation module and the fixture position adjustment module; the data acquisition and analysis module is electrically connected to the excitation module; the fixture position adjustment module is mechanically connected to the support; and the excitation module is mechanically connected to the support.

[0010] Furthermore, the excitation module includes a piezoelectric exciter and an exciter connecting rod; the piezoelectric exciter is coaxial with the exciter connecting rod; the exciter connecting rod includes a short rod and a long rod.

[0011] Furthermore, the long rod is located below the short rod.

[0012] Furthermore, the vibration exciter connecting rod is made of rigid material.

[0013] Furthermore, the fixture position adjustment module includes a sliding base, a slide groove limit block, a spring sheet, and a fastening screw; the sliding base has mounting holes required for installing the fixture, and the requirements for testing different fixtures can be met by adjusting the height of the sliding base; the sliding base is provided with a slide groove; a spring sheet is installed on the inner wall of the slide groove; a slide groove limit block is installed on the sliding base; the fastening screw is connected to the slide groove for fixing the slide groove position.

[0014] Furthermore, the fixture of the sample testing and installation module is selected from a universal shear modulus test fixture, a viscoelastic material shear modulus test fixture, a bulk modulus test fixture, and a Young's modulus test fixture; the fixture is installed between the bottom of the exciter connecting rod and the sliding base.

[0015] Furthermore, each fixture can be installed replaceably to meet different test requirements, and the fixture is installed between the bottom of the long rod of the exciter connecting rod and the sliding base.

[0016] Furthermore, the data acquisition and analysis module includes a force sensor, a displacement sensor, and a thermocouple; the upper end of the force sensor is connected to the piezoelectric vibrator, and the lower end is connected to the displacement sensor through the vibrator connecting rod short rod; the lower end of the displacement sensor is connected to the vibrator connecting rod long rod; the force sensor, displacement sensor and vibrator connecting rod are coaxial; the front end of the thermocouple is close to but not in contact with the sample. The force sensor and displacement sensor respectively obtain the force signal and displacement signal acting on the sample, and the thermocouple is used to measure the temperature signal of the sample position.

[0017] Furthermore, the data acquisition and analysis module also includes a power amplifier, a temperature transmitter, a data acquisition instrument, and a test computer; the power amplifier and the data acquisition instrument are respectively connected to the force sensor and the displacement sensor, and the power amplifier and the data acquisition instrument are used to collect and process force signals and displacement signals; the temperature transmitter is connected to the data acquisition instrument to process and transmit the temperature signal to the data acquisition instrument; the test computer is connected to the data acquisition instrument to receive the data collected by the data acquisition instrument and perform post-processing.

[0018] Furthermore, the support includes a supporting structure, a displacement sensor mounting seat, a heat insulating sheet, long bolts, and a height adjustment rod; the displacement sensor mounting seat is installed on the supporting structure; the height adjustment rod is connected to the supporting structure; and the heat insulating sheet is fixedly mounted on the height adjustment rod by long bolts.

[0019] Furthermore, the slide groove is connected to the height adjustment rod and can slide freely up and down on the height adjustment rod.

[0020] Furthermore, the displacement sensor is mounted on a displacement sensor mounting seat.

[0021] Furthermore, the thermal insulation sheet is composed of a multi-layer structure with excellent thermal insulation performance. When installed on the environmental box under environmental control conditions, it is used to prevent heat exchange between the inside of the environmental box and the outside world. The thermal insulation sheet is fixed to the support by long bolts.

[0022] Furthermore, the bottom of the long connecting rod of the vibration exciter is provided with a mounting hole required for mounting the fixture.

[0023] Furthermore, the universal shear modulus test fixture includes a slide groove, an inner stop block, an outer stop block, a locking pin, a thin gasket, and a spiral push rod that are connected to each other. One side of the thin gasket is bonded to the sample, and the other side is bonded to the outer stop block.

[0024] Furthermore, the viscoelastic material shear modulus test fixture includes a piston connected to the excitation module and an outer mounting ring connected to the fixture position adjustment module.

[0025] Furthermore, the bulk modulus test fixture includes an upper push block connected to the excitation module and a lower push block connected to the fixture position adjustment module.

[0026] Furthermore, the Young's modulus test fixture includes an upper gasket connected to the excitation module and a lower gasket connected to the fixture position adjustment module.

[0027] The utility model further provides a testing method of a device for testing damping performance of acoustic vibration control materials based on a dynamic stiffness method, and the device is used to test the damping performance of materials, comprising the following steps:

[0028] Furthermore, the device performs a material damping performance test, comprising the following steps:

[0029] The first step is to select different fixtures for different test conditions, and to prepare standardized samples of different specifications of the acoustic vibration control materials and firmly install them in the sample test and installation module fixture;

[0030] The second step is to install the corresponding fixture of the sample test and installation module between the sliding base and the long rod of the exciter connecting rod, and fix the height of the sliding base by tightening the screws;

[0031] The second step is to calibrate the system and obtain the phase difference between the output signals of the force sensor and the displacement sensor;

[0032] The third step is to control the test environment temperature to reach the specified conditions through the environmental chamber;

[0033] The fourth step is to turn on the piezoelectric exciter, control the vibration displacement and drive the exciter connecting rod to drive the sample to vibrate;

[0034] The fifth step is to collect signals from the force sensor, displacement sensor, and thermocouple through the data acquisition and analysis module to obtain test results such as force signal, displacement signal, and temperature of the tested sample;

[0035] The sixth step is to solve the test results of the tested sample through the test computer, and obtain the damping-related dynamic mechanical performance results such as the material's complex modulus and loss factor in combination with the shape factor of the sample.

[0036] Furthermore, multiple tests under different excitation and temperature conditions can obtain the correlation between the damping performance of the acoustic vibration control material and the frequency, temperature, and vibration amplitude, providing guidance and reference for the optimal design and engineering application of acoustic vibration control materials.

[0037] Compared with the prior art, the utility model has the following beneficial effects:

[0038] 1) The present technical solution provides a device for testing the damping performance of acoustic vibration control materials based on the dynamic stiffness method, which has the characteristic of replaceable test fixtures and can measure the Young's modulus, shear modulus, bulk modulus and loss factor of the material under corresponding working conditions.

[0039] 2) The present technical solution provides a device (and method) for testing the damping performance of acoustic vibration control materials based on the dynamic stiffness method, which can obtain information such as modulus and loss factor by measuring the phase difference between the excitation and response signals. The range of the measured Young's modulus and damping loss factor is larger than that of the modal method and the energy method.

[0040] 3) The present technical solution provides a device (and method) for testing the damping performance of acoustic vibration control materials based on the dynamic stiffness method, which is suitable for testing materials within a wide frequency and temperature range.

[0041] 4) The present technical solution provides a device for testing the damping performance of acoustic vibration control materials based on the dynamic stiffness method. The device has a compact and streamlined structure. The test process can be completed through the steps of sample fixing and installation, environmental adjustment, sample parameter and test condition input, testing, and data post-processing. The test results are robust and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the overall structure of a device for testing the damping performance of acoustic vibration control materials based on a dynamic stiffness method in an embodiment of the utility model;

[0043] Figure 2 It is a schematic diagram of an excitation module and a data acquisition and analysis module of a device for testing damping performance of acoustic vibration control materials based on a dynamic stiffness method in an embodiment of the utility model;

[0044] Figure 3 It is a schematic diagram of a fixture position adjustment module of a device for testing damping performance of acoustic vibration control materials based on a dynamic stiffness method in an embodiment of the utility model;

[0045] Figure 4 It is a schematic diagram of a universal shear modulus test fixture of a sample test and installation module of a damping performance test device for acoustic vibration control materials based on a dynamic stiffness method in an embodiment of the utility model;

[0046] Figure 5 It is a schematic diagram of a viscoelastic material shear modulus test fixture of a sample test and installation module of an acoustic vibration control material damping performance test device based on a dynamic stiffness method in an embodiment of the utility model;

[0047] Figure 6 It is a schematic diagram of a bulk modulus test fixture of a sample test and installation module of a damping performance test device for acoustic vibration control materials based on a dynamic stiffness method in an embodiment of the utility model;

[0048] Figure 7 It is a schematic diagram of a Young's modulus test fixture of a sample test and installation module of a damping performance test device for acoustic vibration control materials based on a dynamic stiffness method in an embodiment of the utility model;

[0049] Figure 8 It is a schematic diagram of a support of a device for testing the damping performance of acoustic vibration control materials based on a dynamic stiffness method in an embodiment of the utility model.

[0050] The numbers in the figure show:

[0051] 1 is the excitation module, 2 is the fixture position adjustment module, 3 is the sample test and installation module, 4 is the data acquisition and analysis module; 5 is the support; 1-1 is the piezoelectric exciter, 1-2 is the exciter connecting rod; 2-1 is the sliding base, 2-2 is the slide limit block, 2-3 is the spring sheet, 2-4 is the fastening screw; 3-1 is the universal shear modulus test fixture, 3-2 is the viscoelastic material shear modulus test fixture, 3-3 is the bulk modulus test fixture, 3-4 is the Young's modulus test fixture; 3-1-1 is the slide, 3-1-2 is the inner stopper, 3-1-3 is the outer stopper, 3-1-4 is the lock Stop pin, 3-1-5 is a thin gasket, 3-1-6 is a spiral push rod; 3-2-1 is a piston, 3-2-2 is an outer mounting ring; 3-3-1 is an upper push block, 3-3-2 is a lower push block; 3-4-1 is an upper gasket, 3-4-2 is a lower gasket; 4-1 is a force sensor, 4-2 is a displacement sensor, 4-3 is an electric thermocouple, 4-4 is a power amplifier, 4-5 is a temperature transmitter, 4-6 is a data acquisition instrument, 4-7 is a test computer; 5-1 is a supporting structure, 5-2 is a displacement sensor mounting seat, 5-3 is a heat insulating sheet, 5-4 is a long bolt, and 5-5 is a height adjustment rod. DETAILED DESCRIPTION

[0052] The following is a detailed description of the present invention in conjunction with the accompanying drawings and specific embodiments. If the component models, material names, connection structures, control methods and other features not clearly described in this technical solution are all regarded as common technical features disclosed in the prior art.

[0053] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] It should be noted that, in the present utility model, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0055] This technical solution provides a damping performance test device for acoustic vibration control materials based on the dynamic stiffness method, including an excitation module, a fixture position adjustment module, a sample test and installation module, a data acquisition and analysis module, and a support. Taking the acoustic vibration control material as the test object, standardized sample preparation is carried out according to the sample preparation requirements for different test conditions such as tension, shearing, and compression, and the sample is stably installed on the sample test and installation module; the excitation module controls the excitation amplitude and excitation frequency and excites the sample to vibrate, and the force and displacement signals acting on the sample are obtained through the data acquisition and analysis module; the obtained test results are solved, and the damping-related dynamic mechanical performance results such as the complex modulus and loss factor of the material are obtained in combination with the shape factor of the sample, which can provide guidance and reference for the optimal design and engineering application of acoustic vibration control materials.

[0056] Example

[0057] This embodiment provides a device for testing the damping performance of an acoustic vibration control material, comprising a vibration excitation module 1 , a fixture position adjustment module 2 , a sample testing and installation module 3 , a data acquisition and analysis module 4 , and a support 5 .

[0058] The excitation module 1 is used to drive the sample to vibrate; the fixture position adjustment module 2 is used to adjust the fixture position to meet the requirements of different fixture tests; the sample testing and installation module 3 includes a fixture, which is installed between the excitation module 1 and the fixture position adjustment module 2; the data acquisition and analysis module 4 is electrically connected to the excitation module 1; the fixture position adjustment module 2 is mechanically connected to the support 5; the excitation module 1 is mechanically connected to the support 5.

[0059] The excitation module 1 includes a piezoelectric exciter 1-1 and an exciter connecting rod 1-2; the piezoelectric exciter 1-1 and the exciter connecting rod 1-2 are coaxial; the exciter connecting rod 1-2 includes a short rod and a long rod.

[0060] The long rod is located below the short rod.

[0061] The exciter connecting rod 1-2 is made of rigid material.

[0062] The clamp position adjustment module 2 includes a sliding base 2-1, a slide groove limit block 2-2, a spring sheet 2-3, and a fastening screw 2-4; the sliding base 2-1 has mounting holes required for installing the clamp; the sliding base 2-1 is provided with a slide groove; the spring sheet 2-3 is installed on the inner wall of the slide groove; the slide groove limit block 2-2 is installed on the sliding base 2-1; the fastening screw 2-4 is connected to the slide groove for fixing the slide groove position.

[0063] The fixture of the sample testing and installation module 3 is selected from the general shear modulus test fixture 3-1, the viscoelastic material shear modulus test fixture 3-2, the bulk modulus test fixture 3-3, and the Young's modulus test fixture 3-4; the fixture is installed between the bottom of the long rod of the exciter connecting rod 1-2 and the sliding base 2-1.

[0064] Each fixture can be replaced and installed to meet different test requirements. The fixture is installed between the bottom of the long rod of the exciter connecting rod 1-2 and the sliding base 2-1.

[0065] The data acquisition and analysis module 4 includes a force sensor 4-1, a displacement sensor 4-2, a thermocouple 4-3, a power amplifier 4-4, a temperature transmitter 4-5, a data acquisition instrument 4-6, and a test computer 4-7; the upper end of the force sensor 4-1 is connected to the piezoelectric exciter 1-1, and the lower end is connected to the displacement sensor 4-2 through the short rod of the exciter connecting rod 1-2; the lower end of the displacement sensor 4-2 is connected to the long rod of the exciter connecting rod 1-2; the force sensor 4-1, the displacement sensor 4-2 and the exciter connecting rod 1-2 are coaxial; the front end of the thermocouple 4-3 is close to but not in contact with the sample. The force sensor 4-1 and the displacement sensor 4-2 respectively obtain the force signal and the displacement signal acting on the sample, and the thermocouple 4-3 is used to measure the temperature signal of the sample position; the power amplifier 4-4 and the data acquisition instrument 4-6 are respectively connected to the force sensor 4-1 and the displacement sensor 4-2, and the power amplifier 4-4 and the data acquisition instrument 4-6 are used to collect and process the force signal and the displacement signal; the temperature transmitter 4-5 is connected to the data acquisition instrument 4-6 for processing and transmitting the temperature signal to the data acquisition instrument 4-6. The test computer 4-7 is connected to the data acquisition instrument 4-6 for receiving the data collected by the data acquisition instrument 4-6 and performing post-processing.

[0066] The support 5 includes a supporting structure 5-1, a displacement sensor mounting seat 5-2, a heat insulating sheet 5-3, a long bolt 5-4, and a height adjustment rod 5-5; the displacement sensor mounting seat 5-2 is installed on the supporting structure 5-1; the height adjustment rod 5-5 is connected to the supporting structure 5-1; the heat insulating sheet 5-3 is fixedly installed on the height adjustment rod 5-5 by the long bolt 5-4.

[0067] The slide slot is connected with the height adjustment rod 5-5 and can slide freely up and down on the height adjustment rod 5-5.

[0068] The displacement sensor 4-2 is mounted on the displacement sensor mounting seat 5-2.

[0069] The heat insulation sheet 5-3 is composed of a multi-layer structure with excellent heat insulation performance. When installed on the environmental box under environmental control conditions, it is used to prevent heat exchange between the inside of the environmental box and the outside. The heat insulation sheet 5-3 is fixed to the support 5 by long bolts 5-4.

[0070] The bottom of the long rod of the exciter connecting rod 1-2 has the mounting holes required for the mounting fixture.

[0071] The universal shear modulus test fixture 3-1 includes a slide groove 3-1-1, an inner stopper 3-1-2, an outer stopper 3-1-3, a locking pin 3-1-4, a thin gasket 3-1-5, and a screw push rod 3-1-6 which are connected to each other.

[0072] The viscoelastic material shear modulus test fixture 3 - 2 includes a piston 3 - 2 - 1 connected to the excitation module 1 and an outer mounting ring 3 - 2 - 2 connected to the fixture position adjustment module 2 .

[0073] The bulk modulus test fixture 3 - 3 includes an upper push block 3 - 3 - 1 connected to the excitation module 1 and a lower push block 3 - 3 - 2 connected to the fixture position adjustment module 2 .

[0074] The Young's modulus test fixture 3 - 4 includes an upper gasket 3 - 4 - 1 connected to the excitation module 1 and a lower gasket 3 - 4 - 2 connected to the fixture position adjustment module 2 .

[0075] refer to Figure 1-Figure 8 This embodiment provides a device for testing the damping performance of acoustic vibration control materials based on the dynamic stiffness method, including an excitation module 1, a fixture position adjustment module 2, a sample testing and installation module 3, a data acquisition and analysis module 4, and a support 5.

[0076] In this embodiment, the excitation module 1 includes a piezoelectric exciter 1-1 and an exciter connecting rod 1-2. The piezoelectric exciter 1-1 can be a piezoelectric exciter of model FPA-2000E-P-1072-150-SS-1M5 produced by Dynamic Structures and Materials, LLC, with a nominal stroke of 2100μm (-30V to150V); the piezoelectric exciter 1-1 is coaxial with the exciter connecting rod 1-2, and the exciter connecting rod 1-2 is made of rigid material and is divided into two sections, with effective lengths of 20mm and 175mm respectively, and the cross-section is a circle with a diameter of 5mm, and the bottom of the long rod has the installation holes required for the installation fixture; wherein, the 20mm section connects the force sensor 4-1 and the displacement sensor 4-2, and the 175mm section connects the displacement sensor 4-2 and the fixture.

[0077] Figure 3 In the figure, the upper structure of the height adjustment rod 5-5 is not shown completely, which does not affect the structural expression of the clamp position adjustment module 2. In this embodiment, the clamp position adjustment module 2 includes a sliding base 2-1, a slide groove limit block 2-2, a spring sheet 2-3, and a fastening screw 2-4. The sliding base 2-1 has mounting holes required for installing the clamp. The sliding base 2-1 has four slide grooves with a length of 50mm. A spring sheet 2-3 is installed on the inner wall of each slide groove, and a slide groove limit block 2-2 is installed on the opening side. The slide groove can slide up and down freely on the height adjustment rod 5-5. By adjusting the height of the sliding base 2-1, the requirements of different clamp tests can be met. The effective stroke of the sliding base 2-1 is 80mm; the fastening screw 2-4 is used to fix the position of the slide groove on the height adjustment rod 5-5 after the height adjustment is completed.

[0078] In this embodiment, the sample testing and installation module 3 includes a universal shear modulus test fixture 3-1, a viscoelastic material shear modulus test fixture 3-2, a bulk modulus test fixture 3-3, and a Young's modulus test fixture 3-4. Each fixture can be replaced and installed to meet different test requirements, and the fixture is installed between the bottom of the long rod of the exciter connecting rod 1-2 and the sliding base 2-1.

[0079] The universal shear modulus test fixture 3-1 includes a slide 3-1-1, an inner stopper 3-1-2, an outer stopper 3-1-3, a locking pin 3-1-4, a thin gasket 3-1-5, and a screw push rod 3-1-6; the two outer stoppers 3-1-3 can move smoothly between the slides 3-1-1 through the screw push rod 3-1-6; the two sides of the two universal shear modulus test specimens are bonded to the thin gaskets by 495 glue, and the specimens are fixed to the slide 3-1-1. The parts are installed between the inner block 3-1-2 and the outer block 3-1-3. The thin gasket 3-1-5 is completely consistent with the sample except for the thickness. The thin gasket 3-1-5 and the outer block 3-1-3 are also bonded by 495 glue. The lower end surface of the thin gasket 3-1-5 is flush with the lower end surface of the outer block 3-1-3. The sample is clamped by the screw push rod 3-1-6, and the locking pin 3-1-4 is used to tighten the screw push rod 3-1-6. The recommended value of the size of a single sample is 30mm (l) × 15mm (b) × 2mm (δ). For a rectangular sample with a length of l, a width of b and a thickness of δ, the shape coefficient α G =δ / 2lb, the length of the sample should be greater than 4 times the thickness.

[0080] The viscoelastic material shear modulus test fixture 3-2 includes a piston 3-2-1 and an outer mounting ring 3-2-2; the height of the piston 3-2-1 and the outer mounting ring 3-2-2 are both 20mm; the viscoelastic material shear modulus test sample is put on the piston 3-2-1, the outer diameter of the piston 3-2-1 is consistent with the inner diameter of the sample, and the bottom of the sample is 2mm away from the bottom of the piston 3-2-1, and then the two halves of the outer mounting ring 3-2-2 are put on the sample, and the two halves of the outer mounting ring 3-2-2 are fastened by bolts, the top of the outer mounting ring 3-2-2 is flush with the top of the sample, and the inner diameter of the outer mounting ring 3-2-2 is consistent with the outer diameter of the sample. The recommended value of the sample size, the inner diameter d n 20mm, outer diameter d w is 24mm, height h is 16mm. For the inner diameter d n 、Outer diameter d w and a cylindrical specimen with a height h, the shape factor α G =(d w -d n ) / [π×(d w +d n )×h];

[0081] The bulk modulus test fixture 3-3 includes an upper push block 3-3-1 and a lower push block 3-3-2; place the bulk modulus test sample into the lower push block 3-3-2 so that the lower surface of the sample just contacts the bottom surface of the lower push block 3-3-2; move the lower push block 3-3-1 upward so that the upper surface of the sample contacts the lower surface of the upper push block 3-3-1 and compacts the sample. The inner diameter of the lower push block 3-3-2, the diameter of the upper push block 3-3-1, and the sample diameter are consistent. The recommended value of the sample size is For a cylindrical specimen with diameter D and height h, the shape factor α k =4h / πD 2 ;

[0082] The Young's modulus test fixture 3-4 includes an upper gasket 3-4-1 and a lower gasket 3-4-2. The lower surface of the upper gasket 3-4-1 is bonded to the upper surface of the sample by 495 glue, and the upper surface of the lower gasket 3-4-2 is bonded to the lower surface of the sample by 495 glue. The recommended value of the sample size is For a cylindrical specimen with diameter D and height h, the shape factor α E =4h / πD 2 .

[0083] In this embodiment, the data acquisition and analysis module 4 includes a force sensor 4-1, a displacement sensor 4-2, a thermocouple 4-3, a power amplifier 4-4, a temperature transmitter 4-5, a data acquisition instrument 4-6, and a test computer 4-7; the upper end of the force sensor 4-1 is connected to the piezoelectric exciter 1-1, and the lower end is connected to the displacement sensor 4-2 through the short rod of the exciter connecting rod 1-2; the lower end of the displacement sensor 4-2 is connected to the long rod of the exciter connecting rod 1-2; the force sensor 4-1 can use the 208C01 type force sensor produced by the American PCB company, the tensile and compression measurement ranges are both 45N, and the maximum compression The tensile force and the tensile force are both 450N, and the sensitivity is 110mV / N; the displacement sensor 4-2 can be the FCNV19 displacement sensor produced by Beijing Abeke Sensor Technology Co., Ltd., with a displacement range of 2.5mm, a sensitivity of 4.0V / mm, and a core shaft length of 20.3mm; the force sensor 4-1 and the displacement sensor 4-2 are coaxial with the exciter connecting rod 1-2; the front end of the thermocouple 4-3 is close to the sample position, and the 5LSC-KK series thermocouple produced by OMGEA of the United States can be selected, with a measurement temperature range of -267~+260℃, a temperature measurement accuracy of 1℃, and a diameter of 0.51mm. The force sensor 4-1 and the displacement sensor 4-2 respectively obtain the force signal and the displacement signal acting on the sample; the thermocouple 4-3 is used to measure the temperature signal of the sample position; the power amplifier 4-4 and the data acquisition instrument 4-6 are used to collect and process the force signal and the displacement signal; the temperature transmitter 4-5 is used to process and transmit the temperature signal to the data acquisition instrument 4-6. The power amplifier 4-4 can use the SURE TA2024 power amplifier produced by Nanjing Schulse Technology Co., Ltd.; the data acquisition instrument 4-6 needs to meet the frequency resolution ≤ 0.1Hz, dynamic range ≥ 42dB, and is used for processing and collecting force signals and displacements; the test computer 4-7 is used to receive the data collected by the data acquisition instrument 4-6 and perform post-processing.

[0084] In this embodiment, the support 5 includes a support structure 5-1, a displacement sensor mounting seat 5-2, a heat insulating sheet 5-3, a long bolt 5-4, and a height adjustment rod 5-5. The heat insulating sheet 5-3 is composed of a multi-layer structure with excellent heat insulation performance. When installed on the environmental box under environmental control conditions, it is used to prevent the inside of the environmental box from exchanging heat with the outside. The heat insulating sheet 5-3 is fixedly installed on the support 5 by a long bolt 5-4, and the specification of the long bolt is M3*115; the effective adjustment height of the height adjustment rod 5-5 is 0~80mm.

[0085] The device is used to test the damping performance of materials, including the following steps:

[0086] The first step is to select different fixtures for different test conditions, and to prepare standardized samples of different specifications of the acoustic vibration control materials and firmly install them in the fixture of the sample test and installation module 3;

[0087] The second step is to install the corresponding fixture of the sample test and installation module 3 between the sliding base 2-1 and the long rod of the exciter connecting rod 1-2, and fix the height of the sliding base 2-1 by tightening the screws 2-4;

[0088] The second step is to calibrate the system. β(f) is the characteristic of the exciter, displacement sensor and force sensor of the test device under no-load condition, which is determined by formula (1):

[0089] β(f)=[cosΔφ(f)-isinΔφ(f)] / ( |K s |·|λ F |) (1)

[0090] in,

[0091] |K s | is 1 / displacement sensor sensitivity, in meters / volts; |λ F | is the sensitivity of the force sensor, in volts / Newton; Δφ(f) is the phase difference between the output signals of the force sensor 4-1 and the displacement sensor 4-2 under no-load conditions.

[0092] The third step is to control the test environment temperature to reach the specified conditions through the environmental chamber;

[0093] The fourth step is to turn on the piezoelectric exciter 1-1, control the vibration displacement and drive the exciter connecting rod 1-2 to drive the sample to vibrate;

[0094] The fifth step is to collect signals from the force sensor 4-1, the displacement sensor 4-2, and the thermocouple 4-3 through the data acquisition and analysis module 4 to obtain test results such as the force signal, displacement signal, and temperature of the tested sample;

[0095] The sixth step is to solve the test results of the tested sample by the test computer 4-7, and obtain the damping-related dynamic mechanical performance results such as the complex modulus and loss factor of the material in combination with the shape factor of the sample. When using various types of fixtures for testing, the real part of each modulus E', G', K'(f) is as shown in formula (2):

[0096] E′, G′, K′(f) = α E，G，K Re[β(f)·H(f)] (2)

[0097] Where, β(f) and H(f) are defined as shown in equation (1) and equation (6), respectively. E，G，K It is a conversion factor, which is determined according to different stress modes and size parameters of the specimen.

[0098] The imaginary parts of each modulus E″, G″, K″(f) are as shown in formula (3):

[0099] E″, G″, K″(f) = α E，G,K Im[β(f)·H(f)] (3)

[0100] The magnitude of the modulus |E, G, K(f)| is as shown in formula (4):

[0101] |E,G,K(f)|=α E，G，K |β(f)·H(f)| (4)

[0102] Loss factor η E，G，K (f) As in formula (6):

[0103] η E，G，K (f)=Im[β(f)·H(f)] / Re[β(f)·H(f)] (5)

[0104] Place the sample in the corresponding fixture for testing. The complex function H(f) is as follows:

[0105] H(f)=U F (f) / U S (f) (6)

[0106] Among them, U F (f) and U S (f) are the complex signals at the output ends of the force sensor 4-1 and the displacement sensor 4-2 respectively.

[0107] Repeated testing under different excitation and temperature conditions can obtain the correlation between the damping performance of the acoustic vibration control material and the frequency, temperature, and vibration amplitude, providing guidance and reference for the optimal design and engineering application of acoustic vibration control materials.

[0108] The above description of the embodiments is to facilitate the understanding and use of the utility model by those skilled in the art. It is obvious that those familiar with the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the utility model is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the utility model without departing from the scope of the utility model should be within the scope of protection of the utility model.

Claims

1. A device for testing the damping performance of acoustic vibration control materials based on the dynamic stiffness method, characterized in that: The acoustic vibration control material damping performance testing device comprises a vibration excitation module (1), a fixture position adjustment module (2), a sample testing and installation module (3), a data acquisition and analysis module (4), and a support (5); The vibration excitation module (1) is used to drive the sample to vibrate; The fixture position adjustment module (2) is used to adjust the fixture position to meet the requirements of different fixture tests; The sample testing and installation module (3) comprises a fixture, and the fixture is installed between the excitation module (1) and the fixture position adjustment module (2); The data acquisition and analysis module (4) is electrically connected to the vibration excitation module (1); The clamp position adjustment module (2) is mechanically connected to the support (5); The vibration excitation module (1) is mechanically connected to the support (5).

2. The damping performance testing device for acoustic vibration control materials based on the dynamic stiffness method according to claim 1, characterized in that: The excitation module (1) comprises a piezoelectric exciter (1-1) and an exciter connecting rod (1-2); The piezoelectric vibrator (1-1) is coaxial with the vibrator connecting rod (1-2).

3. The damping performance testing device for acoustic vibration control materials based on the dynamic stiffness method according to claim 2, characterized in that: The clamp position adjustment module (2) comprises a sliding base (2-1), a slide slot limit block (2-2), a spring sheet (2-3), and a fastening screw (2-4); The sliding base (2-1) is provided with mounting holes required for mounting the fixture; The sliding base (2-1) is provided with a sliding groove; A spring sheet (2-3) is installed on the inner wall of the slide groove; A slide groove limiting block (2-2) is installed on the sliding base (2-1); The fastening screw (2-4) is connected to the slide slot and is used to fix the position of the slide slot.

4. The damping performance testing device for acoustic vibration control materials based on the dynamic stiffness method according to claim 3 is characterized in that: The fixture of the sample testing and installation module (3) is selected from a universal shear modulus testing fixture (3-1), a viscoelastic material shear modulus testing fixture (3-2), a bulk modulus testing fixture (3-3), and a Young's modulus testing fixture (3-4); The clamp is installed between the vibration exciter connecting rod (1-2) and the sliding base (2-1).

5. The damping performance testing device for acoustic vibration control materials based on the dynamic stiffness method according to claim 4, characterized in that: The universal shear modulus test fixture (3-1) comprises a slide groove (3-1-1), an inner stopper (3-1-2), an outer stopper (3-1-3), a locking pin (3-1-4), a thin gasket (3-1-5), and a screw push rod (3-1-6) which are connected to each other.

6. The damping performance testing device for acoustic vibration control materials based on the dynamic stiffness method according to claim 4, characterized in that: The viscoelastic material shear modulus testing fixture (3-2) comprises a piston (3-2-1) connected to a vibration excitation module (1) and an outer mounting ring (3-2-2) connected to a fixture position adjustment module (2).

7. The device for testing damping performance of acoustic vibration control materials based on dynamic stiffness method according to claim 4, characterized in that: The bulk modulus testing fixture (3-3) comprises an upper push block (3-3-1) connected to the excitation module (1) and a lower push block (3-3-2) connected to the fixture position adjustment module (2).

8. The device for testing damping performance of acoustic vibration control materials based on dynamic stiffness method according to claim 4, characterized in that: The Young's modulus test fixture (3-4) comprises an upper gasket (3-4-1) connected to the excitation module (1) and a lower gasket (3-4-2) connected to the fixture position adjustment module (2).

9. The device for testing damping performance of acoustic vibration control materials based on dynamic stiffness method according to claim 2, characterized in that: The data acquisition and analysis module (4) comprises a force sensor (4-1), a displacement sensor (4-2), and a thermocouple (4-3); The upper end of the force sensor (4-1) is connected to the piezoelectric exciter (1-1), and the lower end is connected to the displacement sensor (4-2) via the exciter connecting rod (1-2); The lower end of the displacement sensor (4-2) is connected to the vibration exciter connecting rod (1-2); The force sensor (4-1), the displacement sensor (4-2) and the vibration exciter connecting rod (1-2) are coaxial; The front end of the thermocouple (4-3) is close to but not in contact with the sample.

10. The device for testing damping performance of acoustic vibration control materials based on dynamic stiffness method according to claim 9, characterized in that: The data acquisition and analysis module (4) also includes a power amplifier (4-4), a temperature transmitter (4-5), a data acquisition instrument (4-6), and a test computer (4-7); The power amplifier (4-4) is connected to the force sensor (4-1) and the displacement sensor (4-2) respectively; The data acquisition instrument (4-6) is connected to the force sensor (4-1) and the displacement sensor (4-2) respectively; The temperature transmitter (4-5) is connected to the data acquisition instrument (4-6); The test computer (4-7) is connected to the data acquisition instrument (4-6).

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