Near-field noise acquisition cover

Abstract

The utility model relates to the technical field of noise acquisition, and discloses a near-field noise acquisition cover which comprises an acquisition cover and an expansion cover, the acquisition cover is of a conical cylinder structure, the radius of the top end of the expansion cover is smaller than that of the tail end, and the tail end of the acquisition cover is connected with the top end of the expansion cover to form a large conical cylinder structure. The outer sides of the collection cover and the expansion cover are sleeved with a first sound insulation layer and a second sound insulation layer respectively, the edges of the first sound insulation layer and the second sound insulation layer extend to the outer sides of the collection cover and the expansion cover respectively, and the first sound insulation layer covers the outer side of the top of the expansion cover and makes contact with the outer wall of the expansion cover. Compared with the prior art, the noise collecting cover is composed of the collecting cover body and the expanding cover body, the noise collecting distance can be prolonged through the expanding cover body, noise in a narrow space can be collected only through the collecting cover body, the structure can be adjusted according to use scenes, and practicability is higher.

Description

Technical Field

[0001] This utility model relates to the field of noise acquisition technology, specifically to a near-field noise acquisition cover. Background Technology

[0002] Noise monitoring is an important means of assessing environmental noise levels and developing noise control strategies. In industrial production, construction machinery has many components such as engines, hydraulic pumps, and gearboxes, which generate noise during operation. To improve the overall noise radiation of the machine, it is necessary to conduct near-field data acquisition and measurement of the noise radiation levels of each component after the machine prototype is manufactured, so that targeted measures can be taken to improve components with high noise radiation values.

[0003] When using acoustic sensors to collect near-field noise from a sound source in engineering, the sensor's acquisition head is pointed towards the sound source being measured. However, because the sensor has not undergone any acoustic processing, it also collects noise from other interfering sound sources while collecting the sound source being measured. This greatly interferes with sound source feature identification or abnormal noise source identification, hindering subsequent data analysis. To address this issue, various near-field noise acquisition covers have emerged on the market. However, existing noise acquisition covers have a simple structure, typically an outward-expanding horn shape with a fixed shape. This makes it impossible to adjust the size according to the environment of the sound source location, resulting in limitations in use in some confined areas. Furthermore, the limited space at the top of the noise acquisition cover allows for the installation of only one set of acoustic sensors, leading to low accuracy in locating spatial noise sources.

[0004] To address the aforementioned technical problems, this application proposes a near-field noise acquisition hood. Utility Model Content

[0005] I. Technical problems to be solved

[0006] The technical problem this invention aims to solve is that existing noise collection covers have a simple structure and fixed shape, making it impossible to adjust their size according to the environment at the sound source location. They only install one set of acoustic sensors, resulting in low accuracy in locating spatial noise sources.

[0007] II. Technical Solution

[0008] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: a near-field noise collection cover, including a collection cover and an extension cover. The collection cover is a conical structure. The radius of the top end of the extension cover is smaller than the radius of the tail end. The tail end of the collection cover is connected to the top end of the extension cover to form a large conical structure. A sound insulation layer one and a sound insulation layer two are respectively sleeved on the outer sides of the collection cover and the extension cover. The edges of the sound insulation layer one and the sound insulation layer two extend to the outer sides of the collection cover and the extension cover, respectively. The sound insulation layer one covers the outer side of the top of the extension cover and contacts the outer wall of the extension cover.

[0009] Multiple acoustic sensors are provided on the inner side of the top of the collection cover. The multiple acoustic sensors are mounted on a circular plate. A conduit passes through the top of the collection cover. A threaded sleeve is installed on one side of the circular plate. The threaded sleeve is threaded to the outer side of the end of the conduit located inside the collection cover.

[0010] As an improvement, the top of the expansion cover is connected with a threaded connecting ring, and the inner wall of the tail end of the collection cover is provided with an annular threaded groove that is fitted to the threaded connecting ring.

[0011] As an improvement, the inner walls of the collection cover and the expansion cover are respectively equipped with a sound-absorbing layer one and a sound-absorbing layer two, with one end of the sound-absorbing layer one and the sound-absorbing layer two in contact.

[0012] As an improvement, both the first and second sound insulation layers are flared outwards.

[0013] As an improvement, a wire connected to multiple sets of acoustic sensors is connected at the center of the circular plate, and the wire extends out from the inside of the conduit.

[0014] As an improvement, an angle-adjustable connector is fitted onto the outer side of the catheter.

[0015] III. Beneficial Effects

[0016] The advantages of this utility model compared with the prior art are as follows:

[0017] 1. The noise collection hood consists of a collection hood and an extension hood. The extension hood can extend the noise collection distance, while the collection hood alone can be used to collect noise in confined spaces. The structure can be adjusted according to the usage scenario, making it more practical.

[0018] 2. The circular plate and multiple acoustic sensors are fixedly installed by connecting the threaded sleeve to the outside of the conduit, so that multiple acoustic sensors can be installed inside the acquisition hood, thereby improving the accuracy of spatial noise source positioning. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a near-field noise collection cover according to this utility model.

[0020] Figure 2 This is a schematic diagram of the overall cross-sectional structure of a near-field noise acquisition cover according to this utility model.

[0021] Figure 3 This is a schematic diagram of the inner structure of a near-field noise collection cover according to this utility model.

[0022] Figure 4 This is a schematic diagram of the structure of an acoustic sensor installed inside the near-field noise collection cover according to this utility model.

[0023] Figure 5This is a schematic diagram of the expansion cover structure of a near-field noise acquisition cover according to this utility model.

[0024] As shown in the figure: 1. Acquisition cover; 2. Expansion cover; 3. Annular threaded groove; 4. Threaded connecting ring; 5. Conduit; 6. Threaded sleeve; 7. Circular plate; 8. Acoustic sensor; 9. Wire; 10. Sound insulation layer one; 11. Sound absorption layer one; 12. Sound insulation layer two; 13. Sound absorption layer two; 14. Angle adjustment connector. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0026] As attached Figure 1 Appendix Figure 2 Appendix Figure 4 and attached Figure 5 As shown, a near-field noise collection cover includes a collection cover 1 and an extension cover 2. The collection cover 1 has a conical structure. The radius of the top end of the extension cover 2 is smaller than the radius of the bottom end. A threaded connecting ring 4 is connected to the top of the extension cover 2. The inner wall of the bottom end of the collection cover 1 has an annular threaded groove 3 for mounting with the threaded connecting ring 4. The bottom end of the collection cover 1 is connected to the top end of the extension cover 2 to form a large conical structure. Sound insulation layer 10 and sound insulation layer 2 are respectively sleeved on the outer sides of the collection cover 1 and the extension cover 2. Both sound insulation layer 10 and sound insulation layer 2 are horn-shaped. The edges of the 12 extend to the outside of the acquisition cover 1 and the expansion cover 2 respectively. The sound insulation layer 10 covers the top outside of the expansion cover 2 and contacts the outer wall of the expansion cover 2. The sound insulation layer 10 and the sound insulation layer 12 block external interference noise from entering the acquisition cover 1 and the expansion cover 2. The inner walls of the acquisition cover 1 and the expansion cover 2 are respectively glued with the sound absorption layer 11 and the sound absorption layer 13. One end of the sound absorption layer 11 and the sound absorption layer 13 are in contact to form a whole piece of sound absorption layer. The sound absorption layer 11 and the sound absorption layer 13 are porous sound absorption media to prevent noise from forming reverberation inside the acquisition cover 1 and the expansion cover 2.

[0027] Example 2

[0028] Based on Example 1, in order to improve the accuracy of spatial noise source localization, as shown in the attached... Figure 3 and attached Figure 4As shown, multiple acoustic sensors 8 are provided on the inner side of the top of the acquisition cover 1. The multiple acoustic sensors 8 are mounted on a circular plate 7. A conduit 5 passes through the top of the acquisition cover 1. A threaded sleeve 6 is installed on one side of the circular plate 7. The threaded sleeve 6 is threaded to the outer side of the end of the conduit 5 located inside the acquisition cover 1. A wire 9 connected to the multiple acoustic sensors 8 is connected at the center of the circular plate 7. The wire 9 passes through the inner side of the conduit 5 and connects to the noise processor. An angle adjustment connector 14 is sleeved on the outer side of the conduit 5. The angle of the noise acquisition cover can be adjusted by connecting the external connector of the angle adjustment connector 14.

[0029] The specific usage method is as follows:

[0030] When monitoring sound sources in a confined space, the expansion cover 2 is removed. The edge of the sound insulation layer 10 has a small radius, making it easy to enter the confined space. The noise enters the acquisition cover 1, and the noise source location is monitored by multiple sets of acoustic sensors 8. In a more spacious space, depending on the monitoring distance requirements, the expansion cover 2 can be connected to the acquisition cover 1 to expand the noise protection range of external interference sound sources, and the noise source location is monitored by multiple sets of acoustic sensors 8.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0033] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A near-field noise acquisition hood, comprising an acquisition hood (1) and an extension hood (2), wherein the acquisition hood (1) has a conical structure, characterized in that: The top radius of the expansion cover (2) is smaller than the tail radius. The tail end of the collection cover (1) is connected to the top of the expansion cover (2) to form a large cone structure. The outer sides of the collection cover (1) and the expansion cover (2) are respectively fitted with a sound insulation layer one (10) and a sound insulation layer two (12). The edges of the sound insulation layer one (10) and the sound insulation layer two (12) extend to the outer sides of the collection cover (1) and the expansion cover (2). The sound insulation layer one (10) covers the outer side of the top of the expansion cover (2) and is in contact with the outer wall of the expansion cover (2). Multiple acoustic sensors (8) are provided on the inner side of the top of the collection cover (1). The multiple acoustic sensors (8) are mounted on the circular plate (7). A conduit (5) passes through the top of the collection cover (1). A threaded sleeve (6) is installed on one side of the circular plate (7). The threaded sleeve (6) is threadedly connected to the outer side of the end of the conduit (5) located inside the collection cover (1).

2. The near-field noise acquisition cover according to claim 1, characterized in that: The top of the expansion cover (2) is connected to a threaded connecting ring (4), and the inner wall of the tail end of the collection cover (1) is provided with an annular threaded groove (3) that is fitted to the threaded connecting ring (4).

3. A near-field noise acquisition hood according to claim 2, characterized in that: The inner walls of the collection cover (1) and the expansion cover (2) are respectively equipped with a sound-absorbing layer one (11) and a sound-absorbing layer two (13), and one end of the sound-absorbing layer one (11) and the sound-absorbing layer two (13) are in contact.

4. A near-field noise acquisition hood according to claim 2, characterized in that: Both the first sound insulation layer (10) and the second sound insulation layer (12) are horn-shaped.

5. A near-field noise acquisition cover according to claim 1, characterized in that: The circular plate (7) is connected to a wire (9) at its center, which is connected to multiple acoustic sensors (8). The wire (9) passes through the inside of the conduit (5).

6. A near-field noise acquisition hood according to claim 5, characterized in that: An angle adjustment connector (14) is sleeved on the outside of the catheter (5).

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