CN219455301U - Near field noise collection cover and near field noise collection device - Google Patents

Abstract

The utility model relates to a noise acquisition device, which aims to solve the problem that the existing acoustic sensor is easy to be interfered when in near field noise acquisition, and the utility model constructs a near field noise acquisition cover and a near field noise acquisition device, wherein the acquisition cover comprises a cone-shaped shell, the shell is open at a large diameter end, a sealing plate is arranged at a small diameter end, a fixed cylinder for accommodating and fixing the acoustic sensor is fixed at the center of the sealing plate, and the fixed cylinder is coaxially arranged with the shell and is communicated with an inner cavity of the shell; and a sound absorption material layer is fixed on the inner side surface of the shell. According to the near-field noise acquisition cover, the near-field noise acquisition cover isolates and blocks the interference of an unintended sound source, so that the acoustic characteristic data acquired by the acoustic sensor is more accurate.

Description

Near field noise collection cover and near field noise collection device

Technical Field

The present utility model relates to a noise collection device, and more particularly, to a near-field noise collection cap and a near-field noise collection device.

Background

The construction machine includes a plurality of components such as an engine, a hydraulic pump, and a transmission, and these components generate noise when the machine is operated. In order to improve the noise radiation of the whole machine, near field acquisition measurement is required to be carried out on the noise radiation level of each component on the machine after the machine prototype is manufactured, so that the component with a large noise radiation value is improved by adopting targeted measures.

When the acoustic sensor is used for collecting near-field noise of a sound source in engineering, the collecting head of the acoustic sensor points to the detected sound source, but the sensor collects noise of other interference sound sources while collecting the intended detected sound source because the sensor does not do any acoustic treatment, so that the noise of the sound source is greatly interfered for sound source characteristic identification or abnormal sound source identification, and the subsequent data analysis is not facilitated.

Disclosure of Invention

The utility model aims to solve the technical problem that the existing acoustic sensor is easy to be interfered when in near-field noise collection, and provides a near-field noise collection cover and a near-field noise collection device so as to reduce the interference of noise of other parts when an acoustic sensor near-field collection machine part works.

The technical scheme for achieving the purpose of the utility model is as follows: the near-field noise acquisition cover is used for a columnar acoustic sensor and is characterized by comprising a cone-shaped shell, wherein the shell is open at a large-diameter end, a sealing plate is arranged at a small-diameter end, a fixed cylinder for accommodating and fixing the acoustic sensor is fixed at the center of the sealing plate, and the fixed cylinder is coaxially arranged with the shell and is communicated with an inner cavity of the shell; and a sound absorption material layer is fixed on the inner side surface of the shell. The sound absorption material layer is a porous sound absorption medium and is adhered to the inner wall surface of the shell of the collecting cover, so that noise is prevented from forming reverberation in the shell.

In the utility model, when near-field noise collection is carried out, the acoustic sensor is fixedly arranged in the fixed cylinder, the collection head is positioned in the inner cavity of the shell, the large end of the shell is aligned to and close to the intended sound source to be detected, and the shell has the effect of blocking and shielding the noise of the interference sound source, so that the interference of other unintended sound sources can be effectively avoided; the acoustic sensor can be used for detecting the characteristic of the intention sound source more accurately, and the abnormal sound source can be identified.

In the near-field noise acquisition cover, a plurality of gaps which are uniformly distributed along the circumferential direction and are parallel to the axial direction are formed at the tail end of the fixed cylinder, and a clamp is arranged at the position where the gaps are formed in the fixed cylinder. The gap enables the tail end of the fixed cylinder to radially deform, and the acoustic sensor is fixedly held and fastened under the action of the clamp, so that the acoustic sensor is fixedly connected with the acquisition cover.

In the near-field noise acquisition cover, the shell comprises a conical cylindrical main body section, a large-diameter cylindrical surface section and a small-diameter cylindrical surface section, wherein the large-diameter cylindrical surface section and the small-diameter cylindrical surface section are positioned at two ends of the main body, and the circumferential side surfaces of the large-diameter cylindrical surface section and the small-diameter cylindrical surface section are cylindrical surfaces.

In the near-field noise collection cover, the cone apex angle of the main body section of the shell is 20+/-5 degrees. Further, the main body section of the shell has a large end diameter of 80+/-2 mm and a small end diameter of 45+/-1 mm.

In the near-field noise collecting cover, the collecting cover further comprises an externally-expanded horn-shaped vibration damping rubber cover, the small end of the vibration damping rubber cover is fixedly sleeved on the large-diameter cylindrical surface section of the shell, and the large end of the vibration damping rubber cover is an elastic deformation end.

In the near-field noise acquisition cover, the length of the vibration reduction rubber cover is 50+/-2 millimeters.

In the near-field noise acquisition cover, a plurality of gaps which are uniformly distributed along the circumferential direction and are parallel to the axial direction are formed in the large end of the vibration reduction rubber cover. The gap at the position enables the local deformability of the large end of the vibration reduction rubber cover to be stronger, the vibration reduction rubber cover is better close to a measured sound source, and other noise is reduced to enter the collecting cover.

In the near-field noise collecting cover, the middle section of the vibration reduction rubber cover is wavy. The wave-shaped vibration reduction section in the middle section of the vibration reduction rubber cover is beneficial to attenuating the transmission of vibration of a measured sound source to the acoustic sensor.

The technical scheme for achieving the purpose of the utility model is as follows: the near-field noise acquisition device is characterized by comprising an acoustic sensor and the near-field noise acquisition cover, wherein the acoustic sensor is fixedly installed in the fixed cylinder, and an acquisition head of the acoustic sensor is positioned in the inner cavity of the shell.

Compared with the prior art, the near-field noise acquisition cover disclosed by the utility model has the advantages that the near-field noise acquisition cover isolates and blocks the interference of an unintended sound source, so that the acoustic characteristic data acquired by the acoustic sensor is more accurate.

Drawings

Fig. 1 is a schematic structural view of a near field noise acquisition cover of the present utility model.

Fig. 2 is a schematic cross-sectional view of a near-field noise collection cover according to the present utility model.

Fig. 3 is a schematic view of the structure of the housing and the fixed cylinder in the near field noise collection housing of the present utility model.

Fig. 4 is a schematic structural view of a vibration damping rubber boot in the near field noise collection boot of the present utility model.

Fig. 5 is a schematic structural diagram of a near field noise acquisition device of the present utility model.

Part names and serial numbers in the figure:

the sound absorption device comprises a shell 1, a sealing plate 11, a cone section 12, a small-diameter section 13, a large-diameter end 14, a fixed cylinder 2, a gap 21, a clamp 3, a vibration absorption rubber cover 4, a separation gap 41, a wavy vibration absorption section 42, a sound absorption material layer 5 and an acoustic sensor 6.

Detailed Description

The following describes specific embodiments with reference to the drawings.

As shown in fig. 1 and 2, the near-field noise collection cover in the present embodiment is used for a columnar acoustic sensor, and comprises a cone-shaped shell 1, wherein the shell 1 is open at a large diameter end, a sealing plate 11 is arranged at a small diameter end, a fixed cylinder 2 for accommodating the fixed acoustic sensor is fixed at the center of the sealing plate 11, and the fixed cylinder 2 is coaxially arranged with the shell 1 and is communicated with an inner cavity of the shell 1; a sound absorbing material layer 5 is fixed to the inner side surface of the casing 1.

As shown in fig. 3, the housing 1 includes a small diameter cylindrical section 13, a main body section 12, and a large diameter cylindrical section 14 fixedly connected in this order. Wherein the main body section 12 is in a conical cylinder shape, the cone apex angle of the main body section 12 is 20+/-5 degrees, the diameter of the large end of the main body section 12 is 80+/-2 mm, and the diameter of the small end of the main body section 12 is 45+/-1 mm. The circumferential side of the large diameter cylindrical section 14 is a cylindrical surface having a diameter equal to the diameter of the large end of the main body section 12 and is connected to the large end of the main body section 12. The circumferential side of the small diameter cylindrical section 13 is a cylindrical surface, the diameter of which is equal to the diameter of the small end of the main body section 12, and is connected to the small end of the main body section 12.

The smooth surface of the shell 1 is beneficial to effective reflection of other interference noise sources, the sound absorption material layer 5 arranged in the shell 1 is a porous sound absorption medium, and the sound absorption material layer 5 is stuck on the inner wall surface of the shell of the collecting cover to avoid reverberation of the noise in the shell 1.

The sealing plate 11 is circular and is arranged at the end part of the small-diameter section of the shell, namely the end part of the small-diameter cylindrical section 13, and the fixed cylinder 2 is fixedly arranged at the center of the sealing plate 11. The end of the fixed cylinder 2 is provided with a plurality of gaps 21 which are uniformly distributed along the circumferential direction and are parallel to the axial direction, and the clamp is arranged at the position of the fixed cylinder 2 where the gaps 21 are arranged. The inner diameter of the fixed cylinder 2 is matched with the outer diameter of the cylindrical acoustic sensor 6, the gap 21 enables the end of the fixed cylinder 2 to deform radially, and the acoustic sensor 6 is fastened tightly under the action of the clamp 3 so that the acoustic sensor and the collecting cover are fixedly connected.

As shown in fig. 4, the vibration-damping rubber cover 4 is in an outward-expansion horn shape, the small end of the vibration-damping rubber cover 4 is fixedly sleeved on the large-diameter cylindrical section 14 of the shell 1, and the large end of the vibration-damping rubber cover 4 is an elastic deformation end.

The length of the vibration damping rubber cover 4 is 50±2 mm. The large end of the vibration damping rubber cover 4 is provided with a plurality of separation gaps 41 which are uniformly distributed along the circumferential direction and are parallel to the axial direction in the length direction. The separation gap 41 enables the large end of the vibration reduction rubber cover 4 to have stronger local deformation capability, better approaches to the sound source to be measured, and reduces other noise from entering the acquisition cover.

The middle section of the vibration damping rubber cover 4 is a wavy vibration damping section 42, and the wavy vibration damping section 42 is beneficial to damping the transmission of the vibration of the tested sound source to the acoustic sensor.

Fig. 5 shows the structure of a near-field noise collection device in an embodiment of the present utility model, in which the near-field noise collection device includes an acoustic sensor 6 and the aforementioned near-field noise collection cover, the acoustic sensor 6 is fixedly installed in the fixed cylinder 2, and a collection head of the acoustic sensor 6 is located in the inner cavity of the housing 1.

In the embodiment, when near-field noise collection is performed, the acoustic sensor is fixedly arranged in the fixed cylinder, the collection head of the acoustic sensor is positioned in the inner cavity of the shell, the large end of the shell is aligned to and close to the intended sound source to be detected, and the shell has the effect of blocking and shielding noise of the interference sound source, so that interference of other unintended sound sources can be effectively avoided; the acoustic sensor can be used for detecting the characteristic of the intention sound source more accurately, and the abnormal sound source can be identified.

Claims (10)

1. The near-field noise acquisition cover is used for a columnar acoustic sensor and is characterized by comprising a cone-shaped shell, wherein the shell is open at a large-diameter end, a sealing plate is arranged at a small-diameter end, a fixed cylinder for accommodating and fixing the acoustic sensor is fixed at the center of the sealing plate, and the fixed cylinder is coaxially arranged with the shell and is communicated with an inner cavity of the shell; and a sound absorption material layer is fixed on the inner side surface of the shell.

2. The near field noise collecting cover according to claim 1, wherein a plurality of slits which are uniformly distributed along the circumferential direction and are parallel to the axial direction are formed at the tail end of the fixed cylinder, and a clamp is arranged at the position where the slits are formed on the fixed cylinder.

3. The near field noise collecting cover according to claim 1 or 2, wherein the casing comprises a conical cylindrical main body section, a large diameter cylindrical section and a small diameter cylindrical section which are positioned at both ends of the main body and whose circumferential sides are cylindrical surfaces.

4. A near field noise pickup housing according to claim 3, wherein the cone apex angle of the main body section of the housing is 20±5°.

5. The near field noise pickup housing of claim 4, wherein the main section of the housing has a major diameter of 80 + -2 mm and a minor diameter of 45 + -1 mm.

6. The near field noise collection cover according to claim 5, wherein the collection cover further comprises a vibration-damping rubber cover in a flared horn shape, a small end of the vibration-damping rubber cover is fixedly sleeved on a large-diameter cylindrical section of the shell, and a large end of the vibration-damping rubber cover is an elastic deformation end.

7. The near field noise pickup housing of claim 6, wherein said vibration damping rubber housing has a length of 50±2 mm.

8. The near field noise collecting cover according to claim 6 or 7, wherein the large end of the vibration damping rubber cover is provided with a plurality of slits which are uniformly distributed along the circumferential direction and the length direction is parallel to the axial direction.

9. The near field noise pickup housing according to claim 6 or 7, characterized in that the middle section of the vibration damping rubber housing is wavy.

10. A near field noise acquisition device characterized by comprising an acoustic sensor and the near field noise acquisition cover of any one of claims 1 to 9, the acoustic sensor being fixedly mounted in the stationary cylinder and an acquisition head of the acoustic sensor being located in the housing inner cavity.