Measuring device and measuring system for measuring influence of structural vibration on acoustic impedance element

Abstract

The invention provides a measuring device and a measuring system for measuring the influence of structural vibration on an acoustic impedance element. The testing device comprises an acoustic impedance tube measuring unit and a vibration emitting unit. The vibration emitting unit comprises a bearing part, a transmission part and a vibration part; the vibration part is connected with the bearing part through the transmission part; the acoustic impedance tube measuring unit is arranged on the bearing part; the vibration part can send a preset force transmitted in a first direction to the bearing part through the transmission part and the bearing part, so that the acoustic impedance tube measurement unit generates structural vibration in the first direction; or the vibration part can send the preset force transmitted in the second direction to the bearing part through the transmission part and the bearing part, so that the acoustic impedance tube measurement unit generates structural vibration in the second direction. The vibration force is added on the basis of the existing measurement of the sound characteristics of the static and immovable material, so that the sound characteristics of the material under the condition of the preset vibration force are measured, and the blank in the field is made up.

Description

Technical Field

[0001] The present application relates to the field of aerospace technology, and in particular to a measuring device and a measuring system for measuring the influence of structural vibration on an acoustic impedance element. Background Art

[0002] Impedance tubes are commonly used in acoustic measurement to measure the acoustic properties of acoustic devices. This has led to the development of various measurement methods, such as the standing wave ratio method and the dual-microphone method. These methods are all effective in measuring the acoustic properties of the object under test. For example, patent number CN202210785731.6 details the design and measurement methods of acoustic impedance tubes.

[0003] However, the existing impedance tube is statically fixed. Scientific research shows that the periodic displacement of the acoustic boundary will affect the acoustic performance of the internal flow acoustic damper. If the statically fixed impedance tube is still used, the mechanical vibration of the damping element itself cannot be simulated, and the acoustic performance under this working condition cannot be accurately measured.

[0004] Therefore, there is an urgent need for a measuring device and a measuring system for measuring the influence of structural vibration on acoustic impedance elements, so as to solve the technical problems existing in the prior art to a certain extent. Summary of the Invention

[0005] The purpose of this application is to provide a measuring device and a measuring system for measuring the influence of structural vibration on an acoustic impedance element, and to apply vibration to a piece to be tested to a certain extent so as to study the effect of vibration on the acoustic characteristics of the piece to be tested.

[0006] The present application provides a measuring device for measuring the influence of structural vibration on an acoustic impedance element; comprising an acoustic impedance tube measuring unit and a vibration emitting unit;

[0007] The vibration emitting unit includes a bearing part, a transmission part and a vibration part; the vibration part is connected to the bearing part through the transmission part; the acoustic impedance tube measurement unit is arranged on the bearing part;

[0008] The vibrating portion can transmit a preset force along a first direction to the bearing portion through the transmission portion and the bearing portion, so that the acoustic impedance tube measuring unit undergoes structural vibration in the first direction; and / or the vibrating portion can transmit a preset force along a second direction to the bearing portion through the transmission portion and the bearing portion, so that the acoustic impedance tube measuring unit undergoes structural vibration in the second direction;

[0009] The acoustic impedance tube measuring unit can measure the acoustic characteristics of the test piece under the first direction structural vibration or the second direction structural vibration.

[0010] In the above technical solution, further, the vibration emitting unit includes a bearing platform capable of serving as the bearing portion, a transmission rod capable of serving as the transmission portion, and a modal exciter capable of serving as the vibration portion;

[0011] The supporting platform has a limited space extending along the second direction, and the acoustic impedance tube measuring unit is arranged in the limited space and extends along the second direction;

[0012] The transmission rod extends along the first direction, and both ends of the transmission rod are respectively connected to the supporting platform and the modal exciter. The modal exciter can transmit a preset force along the first direction to the supporting platform through the transmission rod, so that the acoustic impedance tube measurement unit undergoes structural vibration in the first direction.

[0013] In the above technical solution, further, the vibration emitting unit includes a bearing platform capable of serving as the bearing portion, a transmission rod capable of serving as the transmission portion, and a modal exciter capable of serving as the vibration portion;

[0014] The supporting platform has a limited space extending along the second direction, and the acoustic impedance tube measuring unit is arranged in the limited space and extends along the second direction;

[0015] The transmission rod extends along the second direction, and both ends of the transmission rod are respectively connected to the supporting platform and the modal exciter. The modal exciter can transmit a preset force along the second direction to the supporting platform through the transmission rod, so that the acoustic impedance tube measurement unit undergoes structural vibration in the second direction.

[0016] In the above technical solution, further, the vibration emitting unit also includes a sliding component arranged below the supporting platform;

[0017] The sliding assembly includes a slide rail and a slider adapted to the slide rail; the supporting platform can be slidably arranged on the slide rail through the slider.

[0018] In the above technical solution, further, the slide rail is provided in plurality, and the plurality of slide rails are arranged below the carrying platform at intervals;

[0019] When the vibration part generates a preset force transmitted along the first direction, the slide rail extends along the first direction; when the vibration part generates a preset force transmitted along the second direction, the slide rail extends along the second direction.

[0020] In the above technical solution, further, the measuring device for measuring the influence of structural vibration on the acoustic impedance element further includes a workbench;

[0021] The acoustic impedance tube measuring unit is sequentially arranged on the workbench through the carrying platform and the sliding assembly;

[0022] There is a preset interval between the modal exciter and the supporting platform, and the modal exciter is connected to the supporting platform through the transmission rod.

[0023] In the above technical solution, further, the vibration emitting unit also includes a support frame;

[0024] The support frame is provided with the modal exciter, which can support the modal exciter away from the workbench at the preset interval, and can make the axis of the modal exciter and the axis of the supporting platform be located on the same line.

[0025] In the above technical solution, further, the measuring device for measuring the influence of structural vibration on the acoustic impedance element further includes a laser vibration measurement unit;

[0026] The laser vibration measurement unit includes a laser generating and receiving sensor and a laser vibration measurement module signal conversion box;

[0027] The laser generating and receiving sensor is arranged on the workbench via a three-axis displacement platform and a laser vibration measurement module signal conversion box.

[0028] In the above technical solution, further, the acoustic impedance tube measurement unit includes a measuring section pipe, a microphone, a standing wave sound field forming tube, an air intake adapter section and a speaker;

[0029] The speaker, the air intake adapter section, the standing wave sound field forming tube and the measuring section pipeline are sequentially connected along the second direction;

[0030] One end of the measuring section pipe facing away from the standing wave acoustic field forming pipe is connected to the piece to be measured;

[0031] There are three microphones, which are arranged vertically on the measuring section pipe at intervals.

[0032] The present application also provides a measurement system for measuring the influence of structural vibration on an acoustic impedance element, comprising the above-mentioned measurement device for measuring the influence of structural vibration on an acoustic impedance element.

[0033] Compared with the prior art, this application has the following beneficial effects:

[0034] The present application provides a measuring device for measuring the influence of structural vibration on an acoustic impedance element; comprising an acoustic impedance tube measuring unit and a vibration emitting unit;

[0035] The vibration emitting unit includes a bearing part, a transmission part and a vibration part; the vibration part is connected to the bearing part through the transmission part; the acoustic impedance tube measurement unit is arranged on the bearing part;

[0036] The vibrating portion can transmit a preset force along a first direction to the bearing portion through the transmission portion and the bearing portion, so that the acoustic impedance tube measuring unit undergoes structural vibration in the first direction; and / or the vibrating portion can transmit a preset force along a second direction to the bearing portion through the transmission portion and the bearing portion, so that the acoustic impedance tube measuring unit undergoes structural vibration in the second direction;

[0037] The acoustic impedance tube measuring unit can measure the acoustic characteristics of the test piece under the first direction structural vibration or the second direction structural vibration.

[0038] In summary, this application adds vibration force to the existing measurement of the sound characteristics of stationary materials, thereby measuring the sound characteristics of the material under conditions of preset vibration force. In this respect, it fills the gap in this field.

[0039] The present application also provides a measurement system for measuring the effect of structural vibration on an acoustic impedance element, including the aforementioned measurement device for measuring the effect of structural vibration on an acoustic impedance element. Therefore, the system has all the beneficial effects of the measurement device for measuring the effect of structural vibration on an acoustic impedance element, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0041] Figure 1 A schematic diagram of the structure of the measuring device for measuring the influence of structural vibration on an acoustic impedance element provided by the present application, which is capable of generating structural vibration in a first direction and at a first viewing angle;

[0042] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0043] Figure 3 A schematic diagram of the structure of the measuring device for measuring the influence of structural vibration on an acoustic impedance element provided by the present application, which is capable of generating structural vibration in a first direction and at a second viewing angle;

[0044] Figure 4 for Figure 3Enlarged view of point B in the middle;

[0045] Figure 5 A schematic structural diagram of a measuring device for measuring the influence of structural vibration on an acoustic impedance element provided by the present application, capable of generating structural vibration in a second direction and at a first viewing angle;

[0046] Figure 6 for Figure 5 Enlarged view of point C in the middle;

[0047] Figure 7 This is a schematic structural diagram of the measuring device provided in the present application for measuring the influence of structural vibration on the acoustic impedance element, which can generate structural vibration in a second direction and at a second viewing angle.

[0048] Figure numerals: 1-acoustic impedance tube measurement unit; 101-measuring section pipeline; 102-microphone; 103-standing wave sound field forming tube; 104-air intake adapter section; 105-speaker; 106-test piece; 2-vibration emitting unit; 201-bearing part; 202-transmission part; 203-vibration part; 204-bearing platform; 205-transmission rod; 206-modal exciter; 207-limiting plate; 208-sliding assembly; 209-slide rail; 210-slider; 211-support frame; 3-first direction; 4-second direction; 5-workbench; 6-laser vibration measurement unit; 601-laser generating and receiving sensor; 602-laser vibration measurement module signal conversion box; 603-three-axis displacement platform. DETAILED DESCRIPTION

[0049] The following detailed description is provided to help the reader gain a comprehensive understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent upon understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein. Rather, except for operations that must occur in a particular order, changes may be made that will be apparent upon understanding the disclosure of this application. Furthermore, descriptions of features known in the art may be omitted for clarity and brevity.

[0050] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many possible ways to implement the methods, devices, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0051] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, it may be directly “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on,” “directly connected to,” “directly coupled to,” “directly over,” or “directly covering” another element, there may be no other elements intervening therebetween.

[0052] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0053] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are used only to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Thus, a first member, component, region, layer, or portion in the examples described herein may also be referred to as a second member, component, region, layer, or portion without departing from the teachings of the examples.

[0054] For ease of description, spatial relational terms such as "above," "upper," "below," and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element would subsequently be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientations "above" and "below," depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0055] The terms used herein are intended only to describe various examples and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular is intended to include the plural. The terms "comprise," "include," and "have" list the presence of stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0056] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include changes in shapes that occur during manufacturing.

[0057] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0058] Example 1

[0059] In this embodiment, a measuring device for measuring the effect of structural vibration on acoustic impedance elements is provided, which cleverly combines vibration generation and acoustic impedance measurement, thereby achieving the measurement of acoustic characteristics of the test piece 106 under different structural vibrations, such as acoustic impedance, sound absorption coefficient, etc. Figures 1-4 A measuring device for measuring the influence of structural vibration on an acoustic impedance element in this embodiment is described in detail.

[0060] In this embodiment, a measuring device for measuring the influence of structural vibration on an acoustic impedance element comprises an acoustic impedance tube measuring unit 1 and a vibration emitting unit 2 .

[0061] Specifically, combined Figure 1 And refer to Figure 2 As shown, the vibration emitting unit 2 includes a bearing portion 201, a transmission portion 202, and a vibration portion 203. The vibration portion 203 is connected to the bearing portion 201 via the transmission portion 202. The vibration portion 203 generates a vibration force, which is transmitted to the bearing portion 201 via the transmission portion 202. The acoustic impedance tube measurement unit 1 is disposed on the bearing portion 201; that is, the bearing portion 201 supports and fixes the acoustic impedance tube measurement unit 1; the vibration force is transmitted to the acoustic impedance tube measurement unit 1 via the bearing portion 201.

[0062] Specifically, the vibration part 203 can send a preset force along the first direction 3 to the acoustic impedance tube measurement unit 1 through the transmission part 202 and the bearing part 201, so that the acoustic impedance tube measurement unit 1 undergoes structural vibration in the first direction 3; specifically, combined with Figure 1As shown, the second direction 4 (the second direction 4 is described below) refers to the axial direction of the acoustic impedance tube measurement unit 1, and the first direction 3 refers to the direction perpendicular to the axis of the acoustic impedance tube measurement unit 1. That is, the vibrating portion 203 can exert a preset force perpendicular to the axis of the acoustic impedance tube measurement unit 1 on the acoustic impedance tube measurement unit 1 through the transmission portion 202 and the bearing portion 201, thereby causing the acoustic impedance tube measurement unit 1 to vibrate perpendicular to the axis of the acoustic impedance tube measurement unit 1.

[0063] It is worth noting that the above preset force is controlled by a digital voltage signal, and the maximum output force is 500N.

[0064] Specifically, the acoustic impedance tube measurement unit 1 can measure the acoustic characteristics of the test piece 106 under structural vibration in the first direction 3, such as acoustic impedance, sound absorption coefficient, etc., for evaluating the impact of the structural vibration in the first direction 3 on the acoustic impedance element.

[0065] In summary, this application adds vibration force to the existing measurement of the sound characteristics of stationary materials, thereby measuring the sound characteristics of the material under conditions of preset vibration force. In this respect, it fills the gap in this field.

[0066] In this embodiment, further, combined with Figure 2 As shown, the vibration emitting unit 2 includes a carrying platform 204 that can serve as a carrying portion 201 , a transmission rod 205 that can serve as a transmission portion 202 , and a modal exciter 206 that can serve as a vibration portion 203 .

[0067] Specifically, the support platform 204 serves as a support platform for the acoustic impedance tube measurement unit 1 and the test piece 106, and at the same time bears the vibration force transmitted by the modal exciter 206 through the transmission rod 205. Furthermore, the support platform 204 has a limited space extending along the second direction 4, and the acoustic impedance tube measurement unit 1 is arranged in the limited space and extends along the second direction 4. In other words, this limited space is used to install and fix the acoustic impedance tube measurement unit 1 to ensure that it can stably perform acoustic characteristic measurements during the test. Furthermore, combined with Figure 2 As shown, the vibration emitting unit 2 further includes two sets of limiting plates 207. The two sets of limiting plates 207 are spaced apart on the supporting platform 204 along the first direction 3, with a limiting space defined between the two sets of limiting plates 207. Multiple limiting plates 207 are provided within a set, and the plurality of limiting plates 207 are welded to the supporting platform 204 at intervals along the second direction 4.

[0068] Specifically, the transmission rod 205 extends along the first direction 3, and the two ends of the transmission rod 205 are respectively connected to the support platform 204 and the modal exciter 206. The modal exciter 206 can transmit a preset force along the first direction 3 to the support platform 204 through the transmission rod 205, causing the acoustic impedance tube measurement unit 1 to vibrate structurally in the first direction 3. Furthermore, the transmission rod 205 acts as a transmission medium for the vibration force, transmitting the vibration force generated by the modal exciter 206 to the support platform 204, thereby causing the acoustic impedance tube measurement unit 1 and the device under test 106 to vibrate. In addition, the structural arrangement in which the transmission rod 205 extends along the first direction 3 ensures that the vibration force can be transmitted along the first direction 3, thereby achieving precise vibration control of the acoustic impedance tube measurement unit 1 and the device under test 106. Furthermore, the modal exciter 206 is a prior art and is well understood by those skilled in the art, so it will not be elaborated on here. The modal exciter 206 can be understood as a device for mechanical vibration testing, which excites and stimulates the natural vibration modes of the structure by generating a vibration signal of a specific frequency and amplitude.

[0069] In this embodiment, further, combined with Figure 3 As shown, the vibration emitting unit 2 also includes a sliding assembly 208 arranged below the supporting platform 204. Specifically, the sliding assembly 208 includes a slide rail 209 and a slider 210 adapted to the slide rail 209; the supporting platform 204 can be slidably arranged on the slide rail 209 through the slider 210. Further, in this embodiment, the slide rail 209 extends along the second direction 4; there are multiple slide rails 209, preferably two, and the two slide rails 209 are arranged at intervals along the first direction 3, and the supporting platform 204 is slidably arranged on the slide rails 209 respectively through the two sliders 210. The structure of the two slide rails 209 realizes the balancing effect on the supporting platform 204, preventing the supporting platform 204 from being unbalanced left and right due to one slide rail 209.

[0070] Furthermore, the sliding assembly 208 serves as a track for the sliding of the carrier 204, ensuring that the carrier 204 can move smoothly and accurately along the predetermined direction during the test. Since the acoustic impedance tube measurement unit 1 is arranged on the carrier 204, it can be ensured that the acoustic impedance tube measurement unit 1 can move smoothly and accurately along the first direction 3 during the test.

[0071] Furthermore, the provision of the slide assembly 208 allows the platform 204 to be easily disassembled and reinstalled, which helps simplify the installation and maintenance of the test device. Simultaneously, the standardized design of the slide rails 209 and sliders 210 also facilitates replacement and upgrading.

[0072] In this embodiment, further, combined with Figure 1As shown, the measuring device for measuring the influence of structural vibration on the acoustic impedance element also includes a workbench 5; the acoustic impedance tube measurement unit 1 is arranged on the workbench 5 in sequence through the support platform 204 and the sliding assembly 208. There is a preset interval between the modal exciter 206 and the support platform 204, and it is connected to the support platform 204 through the transmission rod 205. In other words, the modal exciter 206 is not arranged on the workbench 5, that is, the vibration generated by the modal exciter 206 itself will not be transmitted to the acoustic impedance tube measurement unit 1. Therefore, the modal exciter 206 will not cause additional interference and impact to the acoustic impedance tube measurement unit 1 due to its own vibration, thereby ensuring the measurement accuracy. In other words, the workbench 5 plays a role in vibration reduction and isolation to a certain extent. Specifically, it reduces the vibration energy transmitted from the support platform 204 and isolates the vibration of the modal exciter 206. Ideally, it can be regarded as an absolutely stationary plane.

[0073] Furthermore, the vibration emitting unit 2 also includes a support frame 211; a modal exciter 206 is provided on the support frame 211, which can support the modal exciter 206 away from the workbench 5 at a preset interval, and can make the axis of the modal exciter 206 and the axis of the supporting platform located on the same line.

[0074] Furthermore, the design of support frame 211 ensures that the axis of modal exciter 206 and the axis of support platform 204 are aligned. In other words, support frame 211 ensures precise alignment between modal exciter 206 and support platform 204. This is crucial for precisely controlling vibration transmission and improving test accuracy. It reduces energy loss and error accumulation during vibration transmission, helping to improve the accuracy and reliability of test results. In addition, by adjusting the height and angle of support frame 211, the relative position of modal exciter 206 and support platform 204 can be precisely controlled.

[0075] Furthermore, the support frame 211 is made of a high-strength, high-rigidity material, such as steel or aluminum alloy, to ensure that it can withstand the dynamic load generated by the modal exciter 206 during vibration.

[0076] In this embodiment, further, combined with Figure 3 And refer to Figure 4 As shown, the measurement device for measuring the effect of structural vibration on the acoustic impedance element also includes a laser vibrometer unit 6. Specifically, the laser vibrometer unit 6 includes a laser generating and receiving sensor 601 and a laser vibrometer module signal conversion box 602. The laser generating and receiving sensor 601 is separated from the laser vibrometer module signal conversion box 602 and is mounted on the workbench 5 via a three-axis displacement platform 603.

[0077] Furthermore, the laser emitting and receiving sensor 601 is a core component of the laser vibrometer unit 6. It is responsible for emitting a laser beam and receiving the laser beam reflected from the test object 106. By measuring the frequency or phase changes of the reflected laser light, vibration information of the structure under test can be accurately obtained. The laser emitting and receiving sensor 601 is used in all embodiments because of its high sensitivity, high resolution, and high precision, ensuring accurate and reliable measurement results. It also offers the advantage of non-contact measurement, avoiding the errors and interference that may be associated with traditional contact measurement.

[0078] Furthermore, the laser vibration measurement module signal conversion box 602 is responsible for converting and processing the vibration signal collected by the laser generating and receiving sensor 601, and outputting it as a readable digital signal or analog signal; these signals can be used for further data analysis and processing.

[0079] Furthermore, the three-axis displacement platform 603 is used to precisely adjust the position and angle of the laser generating and receiving sensor 601 so as to accurately measure vibration information at different positions or directions on the test piece 106. By adjusting the three-axis displacement platform 603, the laser beam can be flexibly moved and precisely positioned in three-dimensional space.

[0080] In summary, the laser vibrometer unit 6 employs a non-contact measurement method, avoiding the errors and interference that can occur with traditional contact measurement. Furthermore, the laser generator and receiver sensor 601 possesses high sensitivity and high resolution, enabling precise measurement of vibration information from the structure under test. Furthermore, the high-speed, high-precision signal processing capabilities of the laser vibrometer module signal converter box 602 enable real-time and accurate conversion and processing of vibration signals. Furthermore, the high precision, high rigidity, and high stability of the three-axis displacement platform 603 ensure the accuracy of the position and angle of the laser generator and receiver sensor 601 during measurement.

[0081] In this embodiment, further, combined with Figure 3 As shown, the acoustic impedance tube measurement unit 1 includes a measuring section pipe 101 , a microphone 102 , a standing wave sound field forming tube 103 , an air intake adapter section 104 and a speaker 105 .

[0082] Specifically, the loudspeaker 105, the air intake adapter section 104, the standing wave sound field forming tube 103 and the measuring section pipe 101 are connected in sequence along the second direction 4; the end of the measuring section pipe 101 away from the standing wave sound field forming tube 103 is connected to the piece to be measured 106; there are three microphones 102, and the three microphones 102 are spaced apart and vertically arranged in the measuring section pipe 101. It is worth noting that: the dual-microphone method is currently often used to measure the sound field in the standing wave tube. The three-microphone method composed of three microphones used in this application is an advanced version of the current dual-microphone method, which can effectively improve the measurement accuracy. In addition, the three-microphone method composed of three microphones is the same as the current dual-microphone method in terms of measurement principles and methods, which can be understood by those skilled in the art.

[0083] Furthermore, the measuring section pipe 101 is one of the core parts of the acoustic impedance tube measuring unit 1 , which provides a closed space for accommodating the object to be measured 106 and measuring its acoustic impedance characteristics.

[0084] Furthermore, microphone 102 is used to measure the pressure changes of the sound waves in the measuring section pipe 101, thereby deriving the acoustic impedance characteristics of the test piece 106. Preferably, three microphones 102 are provided to ensure that sound wave information from different directions and positions can be captured during the measurement process, thereby improving the accuracy and comprehensiveness of the measurement.

[0085] Furthermore, the standing wave sound field forming tube 103 is used to form a stable standing wave sound field in the measuring section pipe 101, and is tightly connected to the speaker 105 and the air intake adapter section 104 to ensure smooth propagation and reflection of sound waves.

[0086] Furthermore, the air intake adapter section 104 is used to guide the sound waves generated by the speaker 105 into the standing wave sound field forming tube 103, ensuring that the sound waves propagate in the direction consistent with the tube axis. It is worth noting that the air intake adapter section 104 typically has a smooth transition curve and appropriate dimensions to reduce sound wave loss and interference during propagation. It also needs to be tightly connected to the speaker 105 and the standing wave sound field forming tube 103 to ensure the continuity and stability of the sound waves.

[0087] Furthermore, speaker 105 is used to generate sound waves and drive the formation of a standing wave acoustic field. During use, speaker 105 must have sufficient power and frequency response range to ensure that it can generate sound waves of sufficient intensity and cover the frequency range of the device under test 106. It must also be tightly connected to the air intake adapter 104 to ensure smooth propagation of the sound waves.

[0088] During the actual measurement process, speaker 105 generates sound waves, which propagate through air intake adapter 104 and standing wave acoustic field forming tube 103 into measurement section pipe 101. Within measurement section pipe 101, the sound waves interact with the device under test 106, generating reflected and transmitted sound waves. Microphone 102 captures these sound waves and converts them into electrical signals for recording and analysis. By analyzing the sound waves captured by microphone 102, the acoustic impedance characteristics of device under test 106 can be derived.

[0089] Example 2

[0090] In the first embodiment, a case where the vibration emitting unit 2 is used to generate a first direction 3 structural vibration on the acoustic impedance tube measuring unit 1 is described in detail. In this embodiment, a case where the vibration emitting unit 2 is used to generate a second direction 4 structural vibration on the acoustic impedance tube measuring unit 1 is described. Figure 5-Figure 7 FIG. 1 shows a measurement device for measuring the influence of structural vibration on an acoustic impedance element.

[0091] In this embodiment, the vibration emitting unit 2 includes a carrying platform 204 that can serve as a carrying portion 201 , a transmission rod 205 that can serve as a transmission portion 202 , and a modal exciter 206 that can serve as a vibration portion 203 .

[0092] Specifically, the support platform 204 serves as a support platform for the acoustic impedance tube measurement unit 1 and the test piece 106, and at the same time bears the vibration force transmitted by the modal exciter 206 through the transmission rod 205. Furthermore, the support platform 204 has a limited space extending along the second direction 4, and the acoustic impedance tube measurement unit 1 is arranged in the limited space and extends along the second direction 4. In other words, this limited space is used to install and fix the acoustic impedance tube measurement unit 1 to ensure that it can stably perform acoustic characteristic measurements during the test. Furthermore, combined with Figure 2 As shown, the vibration emitting unit 2 further includes two sets of limiting plates 207. The two sets of limiting plates 207 are spaced apart on the supporting platform 204 along the first direction 3, with a limiting space defined between the two sets of limiting plates 207. Multiple limiting plates 207 are provided within a set, and the plurality of limiting plates 207 are welded to the supporting platform 204 at intervals along the second direction 4.

[0093] Specifically, the transmission rod 205 extends along the second direction 4, and the two ends of the transmission rod 205 are respectively connected to the support platform 204 and the modal exciter 206. The modal exciter 206 can transmit a preset force along the second direction 4 to the support platform 204 through the transmission rod 205, causing the acoustic impedance tube measurement unit 1 to vibrate structurally in the second direction 4. Furthermore, the transmission rod 205 acts as a transmission medium for the vibration force, transmitting the vibration force generated by the modal exciter 206 to the support platform 204, thereby causing the acoustic impedance tube measurement unit 1 and the test piece 106 to vibrate. In addition, the structural arrangement in which the transmission rod 205 extends along the second direction 4 ensures that the vibration force can be transmitted along the second direction 4, thereby achieving precise vibration control of the acoustic impedance tube measurement unit 1 and the test piece 106.

[0094] In summary, the device causes the acoustic impedance tube to vibrate transversely perpendicular to the axial direction and longitudinally parallel to the axial direction in space through external actuation, filling the gap in this field.

[0095] It is worth noting that: in Example 1, a structure that generates three structural vibrations in the first direction is given, and in Example 2, a structure that generates four structural vibrations in the second direction is given; this application also protects a situation that can generate both three structural vibrations in the first direction and four structural vibrations in the second direction, and it only needs to superimpose the two.

[0096] Example 3

[0097] The present application also provides a measurement system for measuring the effect of structural vibration on an acoustic impedance element, including the aforementioned measurement device for measuring the effect of structural vibration on an acoustic impedance element. Therefore, the system has all the benefits of the measurement device for measuring the effect of structural vibration on an acoustic impedance element, which will not be elaborated here.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A measuring device for measuring the effect of structural vibration on an acoustic impedance element; characterized in that: It includes an acoustic impedance tube measuring unit and a vibration emitting unit; The vibration emitting unit includes a bearing part, a transmission part and a vibration part; the vibration part is connected to the bearing part through the transmission part; the acoustic impedance tube measurement unit is arranged on the bearing part; The vibrating portion can transmit a preset force along a first direction to the acoustic impedance tube measuring unit through the transmission portion and the bearing portion, so that the acoustic impedance tube measuring unit undergoes structural vibration in the first direction; or the vibrating portion can transmit a preset force along a second direction to the bearing portion through the transmission portion and the bearing portion, so that the acoustic impedance tube measuring unit undergoes structural vibration in the second direction; The acoustic impedance tube measuring unit can measure the acoustic characteristics of the test piece under the first direction structural vibration or the second direction structural vibration.

2. The measuring device for measuring the influence of structural vibration on acoustic impedance elements according to claim 1, characterized in that: The vibration emitting unit includes a bearing platform that can serve as the bearing part, a transmission rod that can serve as the transmission part, and a modal exciter that can serve as the vibration part; The supporting platform has a limited space extending along the second direction, and the acoustic impedance tube measuring unit is arranged in the limited space and extends along the second direction; The transmission rod extends along the first direction, and both ends of the transmission rod are respectively connected to the supporting platform and the modal exciter. The modal exciter can transmit a preset force along the first direction to the supporting platform through the transmission rod, so that the acoustic impedance tube measurement unit undergoes structural vibration in the first direction.

3. The measuring device for measuring the influence of structural vibration on acoustic impedance elements according to claim 1, characterized in that: The vibration emitting unit includes a bearing platform that can serve as the bearing part, a transmission rod that can serve as the transmission part, and a modal exciter that can serve as the vibration part; The supporting platform has a limited space extending along the second direction, and the acoustic impedance tube measuring unit is arranged in the limited space and extends along the second direction; The transmission rod extends along the second direction, and both ends of the transmission rod are respectively connected to the supporting platform and the modal exciter. The modal exciter can transmit a preset force along the second direction to the supporting platform through the transmission rod, so that the acoustic impedance tube measurement unit undergoes structural vibration in the second direction.

4. The measuring device for measuring the influence of structural vibration on an acoustic impedance element according to claim 2 or 3, characterized in that: The vibration emitting unit further includes a sliding assembly disposed below the supporting platform; The sliding assembly includes a slide rail and a slider adapted to the slide rail; the supporting platform can be slidably arranged on the slide rail through the slider.

5. The measuring device for measuring the influence of structural vibration on an acoustic impedance element according to claim 4, characterized in that: There are a plurality of slide rails, and the plurality of slide rails are spaced apart and arranged below the carrying platform; When the vibration part generates a preset force transmitted along the first direction, the slide rail extends along the first direction; when the vibration part generates a preset force transmitted along the second direction, the slide rail extends along the second direction.

6. The measuring device for measuring the influence of structural vibration on an acoustic impedance element according to claim 4, characterized in that: The measuring device for measuring the effect of structural vibration on the acoustic impedance element also includes a workbench; The acoustic impedance tube measuring unit is sequentially arranged on the workbench through the carrying platform and the sliding assembly; There is a preset interval between the modal exciter and the supporting platform, and the modal exciter is connected to the supporting platform through the transmission rod.

7. The measuring device for measuring the influence of structural vibration on an acoustic impedance element according to claim 6, characterized in that: The vibration emitting unit further includes a support frame; The support frame is provided with the modal exciter, which can support the modal exciter away from the workbench at the preset interval, and can make the axis of the modal exciter and the axis of the supporting platform be located on the same line.

8. The measuring device for measuring the influence of structural vibration on an acoustic impedance element according to claim 6, characterized in that: The measuring device for measuring the effect of structural vibration on the acoustic impedance element further comprises a laser vibration measuring unit; The laser vibration measurement unit includes a laser generating and receiving sensor and a laser vibration measurement module signal conversion box; The laser generating and receiving sensor is arranged on the workbench via a three-axis displacement platform and a laser vibration measurement module signal conversion box.

9. The measuring device for measuring the influence of structural vibration on an acoustic impedance element according to claim 1, characterized in that: The acoustic impedance tube measurement unit includes a measuring section pipe, a microphone, a standing wave sound field forming tube, an air intake adapter section and a speaker; The speaker, the air intake adapter section, the standing wave sound field forming tube and the measuring section pipeline are sequentially connected along the second direction; One end of the measuring section pipe facing away from the standing wave acoustic field forming pipe is connected to the piece to be measured; There are three microphones, which are arranged vertically on the measuring section pipe at intervals.

10. A measurement system for measuring the effect of structural vibration on an acoustic impedance element, characterized in that: A measuring device for measuring the influence of structural vibration on an acoustic impedance element according to any one of claims 1 to 9.

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