A solid-borne sound field measuring device
By using a metal plate as the sound field propagation medium on the ultrasonic transducer, combined with a three-dimensional moving platform and coupling block, the problem of inaccurate measurement results by the water immersion method is solved, and accurate sound field measurement is achieved in a high-temperature environment, ensuring the accuracy and stability of the measurement results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ANHUI UNIVERSITY OF TECHNOLOGY
- Filing Date
- 2025-09-29
- Publication Date
- 2026-07-21
AI Technical Summary
Existing water immersion methods for measuring the acoustic field of ultrasonic transducers have poor accuracy, cannot reflect the true acoustic field characteristics of the transducer at actual operating temperatures, and cannot accurately reflect the acoustic characteristics of ultrasound in solid metals, resulting in discrepancies between the measurement results and the actual application effects.
A solid-state acoustic field measurement device is used, which utilizes a metal plate as the sound field propagation medium. Through a cage, pressure sensor, ultrasonic transducer under test, coupling block and three-dimensional moving platform, the ultrasonic transducer is accurately positioned on the metal plate and the sound wave signal is received. This eliminates measurement errors caused by temperature changes and is suitable for acoustic field performance calibration in high-temperature environments.
It ensures that the measurement results reflect the actual working conditions, reduces the error between the measurement results and the actual application, provides a stable transducer reference, and is suitable for contact stress measurement of large and precision equipment such as aero engines.
Smart Images
Figure CN224535233U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a solid-state acoustic field measurement device, belonging to the field of non-destructive testing technology. Background Technology
[0002] In the aerospace field, aero-engines, as the core power unit of aircraft, are directly related to aviation safety in terms of reliability. These large rotating machines, composed of multi-stage rotors with precision assembly, have high requirements for the uniformity of contact stress at the assembly interface during high-speed operation. If uneven contact stress distribution occurs during assembly, the abnormal vibrations generated during high-speed rotation will not only exacerbate component wear but may also lead to serious failures such as blade breakage and bearing failure, posing a direct threat to aviation safety. Therefore, there is an urgent need for precise measurement of the contact stress at the aero-engine rotor assembly interface to further achieve precise control of the contact stress. Ultrasonic stress wave detection technology, due to its non-contact nature, high sensitivity, and applicability to harsh environments, has become an important means of detecting contact stress at the assembly interface of rotor engines. However, the complex structure of rotor engine components requires ultrasonic transducers to generate highly focused and precisely located sound beams to effectively detect stress concentration points in minute areas. The sound field changes caused by contact stress are often weak, requiring transducers with extremely high receiving sensitivity and signal-to-noise ratio to capture these subtle signal changes. Therefore, accurate characterization and calibration of the transducer's sound field performance are the core foundation for ensuring the accuracy and reliability of ultrasonic measurement results of contact stress in aero-engine rotor engines.
[0003] Traditional measurement methods involve immersing the transducer in water, but this approach has inherent limitations in terms of environmental stability, measurement accuracy, and application scenarios. Existing water immersion methods can only be calibrated at low temperatures, failing to reflect the true acoustic field characteristics of the transducer at actual operating temperatures. Even at room temperature, minute changes in water temperature can cause significant changes in sound velocity, greatly affecting the measurement results. Furthermore, in stress measurements of large, precision equipment such as aero-engines, ultrasonic waves primarily propagate in solid metals, whose acoustic characteristics differ drastically from those in water. This inaccurately reflects the actual performance of the transducer after coupling with engine metal components, leading to discrepancies between calibration results and practical applications. Additionally, water immersion methods can cause rust and corrosion on the transducer surface, further affecting the acoustic field measurement results. Utility Model Content
[0004] The present invention aims to solve the problem of poor measurement accuracy in existing ultrasonic transducer sound field measurement using the water immersion method, and thus provides a solid-state sound field measurement device.
[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: A solid-state acoustic field measurement device includes a cage, a pressure sensor, a transducer under test, a coupling block, a measuring transducer, and a three-dimensional moving platform. The metal plate is fixed by an external structure, the cage is mounted on top of the metal plate, and a clamping bolt is threaded vertically through the cage. The transducer under test is clamped between the clamping bolt and the metal plate. A pressure sensor is clamped between the clamping bolt and the top of the transducer under test. The measuring transducer is mounted on the upper surface of the three-dimensional moving platform, and a coupling block is provided between the top of the measuring transducer and the lower surface of the metal plate.
[0006] Furthermore, the bottom end of the cage is connected to the metal plate via a vacuum suction cup.
[0007] Furthermore, the three-dimensional moving platform includes a mounting platform and a three-dimensional moving component, wherein the three-dimensional moving component includes an X-axis slide, a Y-axis slide mounted on the X-axis slide, and a Z-axis slide mounted on the Y-axis slide, and the mounting platform is mounted on the Z-axis slide.
[0008] Furthermore, the Z-axis slide includes a support base, a telescopic adjustment assembly, two V-shaped adjustment blocks, and two first adjustment columns. The support base is fixedly mounted on the slider of the Y-axis slide, and the mounting platform is placed on the support base. The two first adjustment columns are vertically fixed on the lower surface of the mounting platform and are located on both sides of the support base. The two V-shaped adjustment blocks are inverted and rotatably mounted on both sides of the support base. The two first adjustment columns are in contact with the outer inclined surface of one side of the two V-shaped adjustment blocks. The telescopic adjustment assembly is mounted on the support base, and the synchronous rotation of the two V-shaped adjustment blocks is controlled by the telescopic adjustment assembly to realize the up and down movement of the mounting platform.
[0009] Furthermore, the telescopic adjustment assembly includes a telescopic drive body, a connecting rod fixed to the output end of the telescopic drive body, and two second adjustment columns fixed to both ends of the connecting rod. The telescopic drive body is horizontally fixed on the support base, and the two second adjustment columns are in contact with the outer inclined surfaces of the other side of the two V-shaped adjustment blocks.
[0010] Furthermore, the cage is a gantry frame.
[0011] Furthermore, a stepped hole is vertically opened on the top crossbeam of the cage. The small diameter section of the stepped hole is a threaded hole or a smooth hole, and a nut is installed in the large diameter section of the stepped hole. The clamping bolts are sequentially installed from top to bottom in the small diameter section of the stepped hole and in the nut.
[0012] Furthermore, the coupling block is made of rubber. Compared with the prior art, the present invention has the following advantages: This invention relates to a fixed sound field measurement device that utilizes a metal plate as the sound field propagation medium to measure the ultrasonic signal received by the ultrasonic transducer under test. Choosing metal as the sound field propagation medium eliminates sensitivity to temperature changes, thus eliminating measurement errors caused by water temperature variations and providing a stable and reliable transducer reference for contact stress measurement. Furthermore, it can operate stably in high-temperature environments, enabling conditional calibration of the sound field performance of high-temperature transducers and ensuring that the measurement results reflect the actual operating conditions. In addition, the metal plate, as a solid-state acoustic medium, has sound propagation characteristics more closely resembling those of engine metal components. The transducer sound field performance calibrated in this environment is highly consistent with the actual application scenario, effectively reducing the error between the measurement results and the specific application.
[0013] The solid-state acoustic field measurement device of this invention has a simple structure, low production cost, and is easy to maintain. Attached Figure Description
[0014] Figure 1 This is a first three-dimensional structural schematic diagram of a solid-state acoustic field measuring device according to the present invention; Figure 2 This is a second three-dimensional structural diagram of a solid-state acoustic field measuring device according to the present invention; Figure 3 This is a partial cross-sectional schematic diagram of a solid-state acoustic field measuring device according to the present invention.
[0015] In the picture: 1. Cage; 2. Pressure sensor; 3. Ultrasonic transducer under test; 4. Metal plate; 5. Coupling block; 6. Measuring ultrasonic transducer; 7. Three-dimensional moving platform; 8. Mounting platform; 9. X-axis slide; 10. Y-axis slide; 111. Support base; 112. Telescopic adjustment assembly; 113. V-shaped adjustment block; 114. First adjustment column; 12. Clamping bolt; 13. Nut; 14. Vacuum suction cup. Detailed Implementation
[0016] Specific implementation method one: Combining Figures 1-3 This description aims to clearly and completely describe the technical solutions in this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0017] It should be noted that the descriptions of "front," "rear," "left," "right," "inner," "outer," "left side," "right side," "upper part," "lower part," "top," and "bottom" in this invention are defined based on the orientation or positional relationships shown in the accompanying drawings. They are merely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the described structure must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.
[0018] A solid-state acoustic field measurement device includes a retainer 1, a pressure sensor 2, an ultrasonic transducer under test 3, a coupling block 5, a measuring ultrasonic transducer 6, and a three-dimensional moving platform 7. A metal plate 4 is fixed by an external structure. The retainer 1 is mounted above the metal plate 4, and a clamping bolt 12 is threaded vertically through the retainer 1. The ultrasonic transducer under test 3 is clamped between the clamping bolt 12 and the metal plate 4. A pressure sensor 2 is clamped between the clamping bolt 12 and the top of the ultrasonic transducer under test 3. The measuring ultrasonic transducer 6 is mounted on the upper surface of the three-dimensional moving platform 7, and a coupling block 5 is provided between the top of the measuring ultrasonic transducer 6 and the lower surface of the metal plate 4.
[0019] The retainer 1 is used to fix the pressure sensor 2 and the ultrasonic transducer 3 under test.
[0020] The lower end of the clamping bolt 12, the pressure sensor 2, and the top end of the ultrasonic transducer 3 under test are in sequential contact. An axial force is applied by the clamping bolt 12, and the lower surface of the pressure sensor 2 is in contact with the upper surface of the ultrasonic transducer 3 under test. This is used to precisely control the detection pressure and adjust the axial load applied to the ultrasonic transducer under test. The metal plate 4 serves as the medium for sound field propagation, and the lower surface of the ultrasonic transducer 3 under test is in contact with the upper surface of the metal plate 4 to excite ultrasonic signals.
[0021] The upper and lower surfaces of the coupling block 5 are in contact with the lower surface of the metal plate 4 and the upper surface of the measuring ultrasonic transducer 6, respectively, to ensure stable acoustic coupling between the measuring ultrasonic transducer 6 and the metal plate 4.
[0022] The measuring ultrasonic transducer 6 is placed on the three-dimensional moving platform 7 to receive the ultrasonic signals emitted by the ultrasonic transducer 3 under test. The three-dimensional moving platform 7 allows for precise control of the position of the measuring ultrasonic transducer 6 in the X, Y, and Z directions.
[0023] This invention discloses a fixed sound field measurement device that utilizes a metal plate 4 as the sound field propagation medium to measure the ultrasonic signal received by the ultrasonic transducer 6 from the ultrasonic transducer 3 under test. The use of metal as the sound field propagation medium is insensitive to temperature changes, eliminating measurement errors caused by water temperature variations and providing a stable and reliable transducer reference for contact stress measurement. Furthermore, it can operate stably in high-temperature environments, enabling conditional calibration of the sound field performance of high-temperature transducers and ensuring that the measurement results reflect the actual operating conditions. In addition, the metal plate 4, as a solid acoustic medium, has sound propagation characteristics more closely resembling those of engine metal components. The transducer sound field performance calibrated in this environment is highly consistent with the actual application scenario, effectively reducing the error between the measurement results and the specific application.
[0024] The solid-state acoustic field measurement device of this invention has a simple structure, low production cost, and is easy to maintain.
[0025] The three-dimensional moving platform 7 of this utility model can be any structure in the prior art that can realize three-dimensional movement. Its three-dimensional movement can be realized manually or through automated means such as electric motor.
[0026] The bottom end of the retainer 1 is connected to the metal plate 4 via a vacuum suction cup 14. This design allows the retainer 1 to be stably mounted on the metal plate 4. The vacuum suction cup 14 can be fixed to either the bottom end of the retainer 1 or the top surface of the metal plate 4. Preferably, the vacuum suction cup 14 is fixed to the bottom end of the retainer 1, which facilitates adjustment of the retainer 1's mounting position on the metal plate 4. Furthermore, the vacuum suction cup connection is suitable for connecting metal plates of various materials to the retainer.
[0027] The three-dimensional moving platform 7 includes a mounting platform 8 and a three-dimensional moving component, wherein the three-dimensional moving component includes an X-axis slide 9, a Y-axis slide 10 mounted on the X-axis slide 9, and a Z-axis slide mounted on the Y-axis slide 10. The mounting platform 8 is mounted on the Z-axis slide. With this design, the slide rail of the X-axis slide 9 is fixedly mounted on an external device, the slide rail of the Y-axis slide 10 is fixedly mounted on the slider of the X-axis slide 9, and the Z-axis slide is fixedly mounted on the slider of the Y-axis slide 10.
[0028] The Z-axis slide table includes a support base 111, a telescopic adjustment assembly 112, two V-shaped adjustment blocks 113, and two first adjustment columns 114. The support base 111 is fixedly mounted on the slider of the Y-axis slide table 10. The mounting platform 8 is placed on the support base 111. The two first adjustment columns 114 are vertically fixed to the lower surface of the mounting platform 8 and located on both sides of the support base 111. The two V-shaped adjustment blocks 113 are inverted and rotatably mounted on both sides of the support base 111. The two first adjustment columns 114 contact one side of the outer inclined surface of the two V-shaped adjustment blocks 113. The telescopic adjustment assembly 112 is mounted on the support base 111. The telescopic adjustment assembly 112 controls the synchronous rotation of the two V-shaped adjustment blocks 113, thereby achieving the vertical movement of the mounting platform 8. In this design, the telescopic adjustment assembly 112 controls the synchronous rotation of the two V-shaped adjustment blocks 113, causing the two first adjustment columns 114 to move upwards along the inclined surface of the inverted V-shaped adjustment blocks 113, thus achieving the vertical movement of the mounting platform 8.
[0029] The telescopic adjustment assembly 112 includes a telescopic drive body, a connecting rod fixed to the output end of the telescopic drive body, and two second adjustment columns fixed to both ends of the connecting rod. The telescopic drive body is horizontally fixed on the support base 111, and the two second adjustment columns are in contact with the outer inclined surfaces of the other side of the two V-shaped adjustment blocks 113. With this design, the telescopic drive body can be any existing technology that can realize the telescopic function, such as a telescopic cylinder.
[0030] Cage 1 is a gantry frame.
[0031] The top crossbeam of the retainer 1 has a stepped hole vertically formed. The small diameter section of the stepped hole is either a threaded hole or a smooth hole, and a nut 13 is installed in the large diameter section of the stepped hole. The clamping bolt 12 is sequentially inserted into the small diameter section of the stepped hole and the nut 13 from top to bottom. With this design, when the small diameter section of the stepped hole is a smooth hole, a hexagonal groove or hexagonal hole matching the nut is formed in the large diameter section of the stepped hole. The nut 13 achieves a threaded connection with the clamping bolt 12, thereby fixing the axial position of the clamping bolt 12. When the small diameter section of the stepped hole is a threaded hole, the nut 13 further tightens the clamping bolt 12. In this case, the large diameter section of the stepped hole can be a circular hole or a hexagonal hole, as long as the nut 13 can be inserted.
[0032] The coupling block 5 is made of rubber.
[0033] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A solid-state acoustic field measuring device, characterized in that: The device includes a retainer (1), a pressure sensor (2), an ultrasonic transducer under test (3), a coupling block (5), a measuring ultrasonic transducer (6), and a three-dimensional moving platform (7). The metal plate (4) is fixed by an external structure. The retainer (1) is installed above the metal plate (4). A clamping bolt (12) is threaded vertically through the retainer (1). The ultrasonic transducer under test (3) is clamped between the clamping bolt (12) and the metal plate (4). A pressure sensor (2) is clamped between the clamping bolt (12) and the top of the ultrasonic transducer under test (3). The measuring ultrasonic transducer (6) is installed on the upper surface of the three-dimensional moving platform (7). A coupling block (5) is provided between the top of the measuring ultrasonic transducer (6) and the lower surface of the metal plate (4).
2. The solid-state acoustic field measuring device according to claim 1, characterized in that: The bottom end of the retainer (1) is connected to the metal plate (4) by a vacuum suction cup (14).
3. The solid-state acoustic field measuring device according to claim 1, characterized in that: The three-dimensional moving platform (7) includes a mounting platform (8) and a three-dimensional moving component, wherein the three-dimensional moving component includes an X-axis slide (9), a Y-axis slide (10) mounted on the X-axis slide (9), and a Z-axis slide mounted on the Y-axis slide (10), and the mounting platform (8) is mounted on the Z-axis slide.
4. The solid-state acoustic field measuring device according to claim 3, characterized in that: The Z-axis slide includes a support base (111), a telescopic adjustment assembly (112), two V-shaped adjustment blocks (113), and two first adjustment columns (114). The support base (111) is fixed on the slider of the Y-axis slide (10). The mounting platform (8) is placed on the support base (111). The two first adjustment columns (114) are vertically fixed on the lower surface of the mounting platform (8) and located on both sides of the support base (111). The two V-shaped adjustment blocks (113) are inverted and rotatably mounted on both sides of the support base (111). The two first adjustment columns (114) are in contact with the outer inclined surface of one side of the two V-shaped adjustment blocks (113). The telescopic adjustment assembly (112) is mounted on the support base (111). The telescopic adjustment assembly (112) controls the synchronous rotation of the two V-shaped adjustment blocks (113) to realize the up and down movement of the mounting platform (8).
5. A solid-state acoustic field measuring device according to claim 4, characterized in that: The telescopic adjustment assembly (112) includes a telescopic drive body, a connecting rod fixed to the output end of the telescopic drive body, and two second adjustment columns fixed to both ends of the connecting rod. The telescopic drive body is horizontally fixed on the support base (111), and the two second adjustment columns are in contact with the outer inclined surface of the other side of the two V-shaped adjustment blocks (113).
6. A solid-state acoustic field measuring device according to claim 1, characterized in that: The cage (1) is a gantry frame.
7. A solid-state acoustic field measuring device according to claim 1, characterized in that: The top crossbeam of the retainer (1) has a stepped hole vertically opened. The small diameter section of the stepped hole is a threaded hole or a smooth hole. A nut (13) is provided in the large diameter section of the stepped hole. The clamping bolt (12) is installed from top to bottom in the small diameter section of the stepped hole and the nut (13).
8. A solid-state acoustic field measuring device according to claim 1, characterized in that: The coupling block (5) is made of rubber.