Wind turbine nacelle active noise reduction device

Abstract

The application relates to the field of wind turbine nacelle noise reduction technology and discloses a wind turbine nacelle active noise reduction device, which comprises a sound collecting part, a noise reduction part, a controller and a protection assembly. The sound collecting part is arranged in the wind turbine nacelle to collect noise. The noise reduction part is arranged in the wind turbine nacelle to emit directional sound waves. The controller is electrically connected with the sound collecting part and the noise reduction part, is used for receiving noise signals and generating reverse sound wave control signals. The protection assembly comprises a sound collecting protection part, the sound collecting protection part comprises a protection box, at least part of the sound collecting part is arranged in the protection box, and a sound collecting end of the sound collecting part faces a first side of the protection box. A mesh plate is arranged on the side to enable sound to enter the protection box. The device can actively reduce noise of local noise sources in the nacelle, meanwhile, the protection assembly can adapt to the complex environment of the wind turbine nacelle, and the long-term operation reliability is ensured.

Description

Technical Field

[0001] This invention belongs to the field of wind turbine nacelle noise reduction technology, specifically relating to an active noise reduction device for wind turbine nacelles. Background Technology

[0002] In related technologies, noise control inside wind turbine nacelles often employs passive noise reduction methods, such as laying sound-absorbing materials on the inner walls of the nacelle, covering the equipment casing with sound insulation, installing sound-absorbing structures in the air ducts, or adding sound-absorbing panels in localized areas. These methods are effective for mid-to-high frequency noise, but for low-frequency or narrowband peak noise generated by localized sound sources such as cooling fans, generators, and hot air ducts, relying on passive materials often requires a large thickness or a large placement space, making it difficult to achieve ideal results within the limited space of the nacelle.

[0003] Active noise cancellation technology reduces noise levels in localized areas by collecting noise signals and generating inverse sound waves that match the target noise. However, the interior of a wind turbine nacelle is a complex environment characterized by high temperature, high humidity, dust, salt spray, vibration, and airflow. Ordinary microphones, speakers, and controllers are directly placed inside the nacelle, making them susceptible to problems such as moisture absorption, overheating, acoustic performance degradation, electronic component failure, and maintenance difficulties. This makes it difficult for general-purpose active noise cancellation equipment to operate reliably in wind turbine nacelle environments for extended periods. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose an active noise reduction device for wind turbine nacelles, capable of targeted active noise reduction of local noise sources within the nacelle, while adapting to the complex environment of wind turbine nacelles such as high temperature, high humidity, and dust, ensuring long-term operational reliability.

[0005] The active noise reduction device for wind turbine nacelles according to embodiments of this disclosure includes:

[0006] A receiver, which is installed in the wind turbine nacelle, is used to collect noise; A noise reduction device, which is installed in the wind turbine nacelle, to emit directional sound waves; The controller is electrically connected to the receiver and the noise reduction device, and is used to receive the noise signal collected by the receiver and generate a reverse sound wave control signal. The noise reduction device emits directional sound waves according to the reverse sound wave control signal. A protective assembly includes a microphone protective element, which includes a protective housing. At least a portion of the microphone is disposed inside the protective housing. The microphone receiving end faces a first side of the protective housing. The first side of the protective housing is provided with a perforated plate to allow sound to enter the protective housing.

[0007] The active noise reduction device for wind turbine nacelles in this embodiment forms an active noise reduction circuit through the arrangement of a receiver, a noise reduction component, a controller, and a protective component, enabling targeted noise reduction of local noise sources within the nacelle. The receiver is housed inside a protective enclosure, which has a perforated plate on one side of the receiver. This allows external sound to pass through the perforated plate into the enclosure and be collected by the receiver. Simultaneously, the perforated plate provides physical protection for the receiver, preventing larger particles or airflow from directly impacting the receiver.

[0008] In some embodiments, the radio protection device further includes a cooling fan, which is disposed in the protective box and located on the side of the radio end away from the perforated plate. The airflow direction of the cooling fan is configured such that the air entering the protective box flows from the perforated plate side to the cooling fan side.

[0009] The active noise reduction device for wind turbine nacelles in this embodiment of the present disclosure forms an airflow from the mesh plate side to the cooling fan side inside the protective box through the setting of the cooling fan. This can timely dissipate the heat generated by the operation of electronic components inside the protective box. At the same time, the airflow path avoids the front of the receiver, reducing the direct impact of the airflow on the receiver and reducing the interference of airflow noise on sound acquisition.

[0010] In some embodiments, the radio protection device further includes a hydrophobic acoustic membrane, which is sleeved on the radio receiver.

[0011] The active noise reduction device for wind turbine nacelles in this embodiment forms a hydrophobic and sound-permeable protective layer on the surface of the receiver end by setting a hydrophobic and sound-permeable membrane. This can ensure the penetration of sound signals while preventing condensation, moisture or water droplets from directly contacting the diaphragm or sound hole of the receiver end, thereby reducing the risk of signal distortion or device failure caused by moisture.

[0012] In some embodiments, the protective assembly further includes a noise reduction protective element, which includes a protective housing. At least a portion of the noise reduction element is disposed within the protective housing. A protective door is provided on one side of the protective housing. The protective door is hinged to the protective housing. The protective door has multiple through holes for directional sound waves emitted by the noise reduction element to pass through.

[0013] The active noise reduction device for wind turbine nacelles in this embodiment of the present disclosure, through the installation of a noise reduction protective component, places the noise reduction component inside a protective box, providing physical protection for the noise reduction component and preventing dust, salt spray, and airflow from directly corroding the sound wave emitting unit. The protective door is hinged to the protective box, facilitating the opening of the protective door for inspection or replacement of the internal noise reduction component. Multiple through holes are formed in the protective door, providing an emission channel for the directional sound waves emitted by the noise reduction component, allowing the reverse sound waves to be effectively output onto the noise propagation path.

[0014] In some embodiments, the active noise reduction device for wind turbine nacelles further includes a movable component, which includes a slide rail and a slide base. The slide rail is used to be disposed on the inner wall of the wind turbine nacelle, and the slide base is slidably disposed on the slide rail. The sound receiver and the noise reduction component are both mounted on the slide base.

[0015] The active noise reduction device for wind turbine nacelles in this embodiment of the present disclosure, through the setting of the moving component, enables the sound receiving component and the noise reduction component to move as a whole along the slide rail, which facilitates the adjustment of the position according to the change of the noise source position in the nacelle or different nacelle structures, thereby improving the adaptability and installation flexibility of the device.

[0016] In some embodiments, the slide is provided with a rotating member, and at least one of the microphone and the noise reduction member is connected to the slide via the rotating member. The rotating member is used to adjust the orientation of the microphone and / or the noise reduction member.

[0017] The active noise reduction device for wind turbine nacelles in this embodiment adds an angle adjustment function to the existing movement adjustment by setting a rotating component. This allows the sound receiving direction of the receiver and the emission direction of the noise reduction component to be precisely adjusted according to the direction of the noise propagation path, thereby improving the effectiveness of active noise reduction.

[0018] In some embodiments, both the microphone and the noise reduction device are connected to the slide via the rotating member, and the microphone's receiving direction is consistent with the noise reduction device's transmitting direction.

[0019] The active noise reduction device for wind turbine nacelles in this embodiment of the invention sets the sound receiving direction of the receiver to be consistent with the emission direction of the noise reduction device, so that the direction of noise collection by the receiver matches the direction of the reverse sound wave emitted by the noise reduction device, ensuring spatial alignment between the reference signal and the secondary sound wave, which is beneficial to improving the effect of sound wave superposition and cancellation.

[0020] In some embodiments, there are multiple moving components, and each moving component is provided with a sound-receiving element and a noise-reducing element on its slide. The multiple moving components are respectively arranged at different noise sources inside the wind turbine nacelle.

[0021] The active noise reduction device for wind turbine nacelles in this embodiment of the present disclosure, by setting up multiple movable components, can respectively arrange sound receiving components and noise reduction components at multiple local noise sources such as cooling units, generators, and hot air ducts in the nacelle, so as to realize distributed active noise reduction control for noise sources with different locations and different frequency characteristics, thereby improving the overall noise reduction effect of the nacelle. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the internal structure of the radio protection component in this invention.

[0023] Figure 2 This is a top view of the radio protection component in this invention.

[0024] Figure 3 This is a schematic diagram of the noise reduction component in this invention.

[0025] Figure 4 This is a schematic diagram of the noise reduction and protection component in this invention.

[0026] Figure 5 This is a schematic diagram of the distribution of the mobile components in the wind turbine nacelle in this invention.

[0027] Figure 6 This is a schematic diagram of the structure of the moving component in this invention.

[0028] Figure label: 1. Receiver; 11. Receiver terminal; 2. Noise reduction components; 3. Controller; 4. Protective components; 41. Soundproofing components; 411. Protective enclosure; 412. Mesh panel; 413. Cooling fan; 414. Hydrophobic and acoustically permeable membrane; 42. Noise reduction components; 421. Protective enclosure; 422. Protective door; 423. Through hole; 5. Moving component; 51. Slide rail; 52. Slide block; 53. Rotating component. Detailed Implementation

[0029] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0030] The active noise reduction device for wind turbine nacelles according to this disclosure can be applied inside the nacelle of a wind turbine generator set to actively reduce local noise sources such as cooling units, generators, and hot air ducts. Of course, this device can also be applied to other enclosed or semi-enclosed spaces with local noise sources and complex environmental conditions.

[0031] like Figures 1-5As shown, the active noise reduction device for wind turbine nacelles according to this embodiment includes a receiver 1, a noise reduction component 2, a controller 3, and a protective assembly 4. The receiver 1 is disposed in the wind turbine nacelle to collect noise. The noise reduction component 2 is disposed in the wind turbine nacelle to emit directional sound waves. The controller 3 is electrically connected to the receiver 1 and the noise reduction component 2, and is used to receive the noise signal collected by the receiver 1 and generate a reverse sound wave control signal. The noise reduction component 2 emits directional sound waves according to the reverse sound wave control signal. The protective assembly 4 includes a sound-receiving protective component 41, which includes a protective housing 411. At least a portion of the receiver 1 is disposed within the protective housing 411, with the receiving end 11 of the receiver 1 facing a first side of the protective housing 411. A perforated plate 412 is provided on the first side of the protective housing 411 to allow sound to enter the protective housing 411.

[0032] The active noise reduction device for wind turbine nacelles in this embodiment forms an active noise reduction circuit through the arrangement of a receiver 1, a noise reduction component 2, a controller 3, and a protective component 4, which can target and reduce local noise sources within the nacelle. The receiver 1 is housed inside a protective box 411. A perforated plate 412 is provided on the side of the receiver 11 in the protective box 411, allowing external sound to enter the protective box 411 through the perforated plate 412 and be collected by the receiver 1. At the same time, the perforated plate 412 provides physical protection for the receiver 1, preventing larger particles or airflow from directly impacting the receiver 11.

[0033] Specifically, the receiver 1 includes at least one microphone unit for acquiring signal information such as the frequency, amplitude, and phase of the noise source. The noise reduction unit 2 includes a directional sound wave transmitter array, which comprises multiple sound wave transmitting units. These units can be arranged in a linear or area array as needed to form a directional sound wave emission beam. The controller 3 receives the noise signal output from the receiver 1, processes the signal, and generates a reverse sound wave control signal with the opposite phase to the target noise, driving the noise reduction unit 2 to emit the reverse sound wave.

[0034] In some embodiments, the radio protection component 41 further includes a cooling fan 413, which is disposed in the protection box 411 and located on the side of the radio end 11 away from the perforated plate 412. The airflow direction of the cooling fan 413 is configured to allow the air entering the protection box 411 to flow from the perforated plate 412 side to the cooling fan 413 side.

[0035] The active noise reduction device for wind turbine nacelles in this embodiment of the present disclosure, through the arrangement of the cooling fan 413, forms an airflow from the mesh plate 412 side to the cooling fan 413 side inside the protective box 411, which can timely dissipate the heat generated inside the protective box 411 due to the operation of electronic components. At the same time, the airflow path avoids the front of the receiver 11, reducing the direct impact of the airflow on the receiver 11 and reducing the interference of airflow noise on sound acquisition.

[0036] Specifically, there can be one or more cooling fans 413. When multiple cooling fans 413 are installed, an auxiliary fan can be added to the side of the protective box 411 opposite to the cooling fans 413 to form opposing airflow and improve heat dissipation efficiency.

[0037] In some embodiments, the sound-receiving protective component 41 further includes a hydrophobic sound-permeable membrane 414, which is sleeved on the sound-receiving end 11.

[0038] The active noise reduction device for wind turbine nacelles in this embodiment forms a hydrophobic and sound-permeable protective layer on the surface of the receiver 11 by setting a hydrophobic and sound-permeable membrane 414. This can ensure the penetration of sound signals while preventing condensation, moisture or water droplets from directly contacting the diaphragm or sound hole of the receiver 11, thereby reducing the risk of signal distortion or device failure caused by moisture.

[0039] Specifically, the hydrophobic and sound-permeable membrane 414 can be made of polytetrafluoroethylene microporous membrane or other membrane materials with hydrophobic and sound-permeable properties, and is fixed to the receiver 11 by means of fitting, bonding or hot pressing.

[0040] In some embodiments, the protective component 4 further includes a noise reduction protective element 42, which includes a protective housing 421. At least a portion of the noise reduction element 2 is disposed inside the protective housing 421. A protective door 422 is provided on one side of the protective housing 421. The protective door 422 is hinged to the protective housing 421. A plurality of through holes 423 are provided on the protective door 422 for directional sound waves emitted by the noise reduction element 2 to pass through.

[0041] The active noise reduction device for wind turbine nacelles in this embodiment uses a noise reduction protection component 42 to place the noise reduction component 2 inside a protective housing 421, providing physical protection for the noise reduction component 2 and preventing dust, salt spray, and airflow from directly eroding the sound wave emitting unit. A protective door 422 is hinged to the protective housing 421, facilitating the opening of the protective door 422 for inspection or replacement of the internal noise reduction component 2. Multiple through holes 423 are formed on the protective door 422, providing an emission channel for the directional sound waves emitted by the noise reduction component 2, allowing the reverse sound waves to be effectively output onto the noise propagation path.

[0042] Specifically, the through-hole 423 can be circular, square, or strip-shaped, and the distribution area of ​​the through-hole 423 corresponds to the emitting surface of the noise reduction component 2. Furthermore, a sound-permeable protective membrane can be provided on the inner or outer side of the protective door 422, covering multiple through-holes 423, to further enhance the moisture-proof and dust-proof effect while ensuring the passage of sound waves.

[0043] In some embodiments, the active noise reduction device for wind turbine nacelles further includes a movable component 5, which includes a slide rail 51 and a slide base 52. The slide rail 51 is used to be installed on the inner wall of the wind turbine nacelle, and the slide base 52 is slidably installed on the slide rail 51. The sound receiver 1 and the noise reduction component 2 are both installed on the slide base 52.

[0044] The active noise reduction device for wind turbine nacelles in this embodiment of the present disclosure, through the setting of the moving component 5, enables the sound receiver 1 and the noise reduction component 2 to move as a whole along the slide rail 51, which facilitates the adjustment of the position according to the change of the noise source position in the nacelle or different nacelle structures, thereby improving the adaptability and installation flexibility of the device.

[0045] Specifically, the slide rail 51 can be fixed to the inner wall of the cabin by bolts or brackets, and the slide block 52 and the slide rail 51 can be slidably engaged by rollers or sliders. A locking element can be provided on the slide block 52 to lock the slide block 52 in a predetermined position on the slide rail 51 after adjustment.

[0046] In some embodiments, the slide 52 is provided with a rotating member 53, and at least one of the microphone 1 and the noise reduction member 2 is connected to the slide 52 through the rotating member 53. The rotating member 53 is used to adjust the orientation of the microphone 1 and / or the noise reduction member 2.

[0047] The active noise reduction device for wind turbine nacelles in this embodiment adds an angle adjustment function to the existing movement adjustment by setting the rotating component 53. This allows the sound receiving direction of the receiver 1 and the emission direction of the noise reduction component 2 to be precisely adjusted according to the direction of the noise propagation path, thereby improving the effectiveness of active noise reduction.

[0048] Specifically, the rotating component 53 can be a turntable, a hinged base, or a universal joint, etc. The microphone 1 and the noise reduction component 2 can be connected to the slide 52 separately through independent rotating components, or they can share the same rotating component to achieve synchronous angle adjustment.

[0049] In some embodiments, both the receiver 1 and the noise reduction component 2 are connected to the slide 52 via the rotating component 53, and the receiving direction of the receiver 1 is consistent with the transmitting direction of the noise reduction component 2.

[0050] The active noise reduction device for wind turbine nacelles in this embodiment of the present invention sets the sound receiving direction of the receiver 1 to be consistent with the emission direction of the noise reduction component 2, so that the direction of noise collected by the receiver 1 matches the direction of the reverse sound wave emitted by the noise reduction component 2, ensuring that the reference signal and the secondary sound wave are aligned in space, which is beneficial to improving the effect of sound wave superposition and cancellation.

[0051] In some embodiments, there are multiple moving components 5, and each moving component 5 has a sound receiver 1 and a noise reduction component 2 on its slide 52. The multiple moving components 5 are respectively arranged at different noise sources in the wind turbine nacelle.

[0052] The active noise reduction device for wind turbine nacelles in this embodiment of the present disclosure, by setting multiple movable components 5, can respectively arrange sound receivers 1 and noise reduction components 2 at multiple local noise sources such as cooling units, generators, and hot air ducts in the nacelle, so as to realize distributed active noise reduction control for noise sources with different locations and different frequency characteristics, and improve the overall noise reduction effect of the nacelle.

[0053] Specifically, multiple moving components 5 can be controlled independently, and noise reduction control can be performed by the same controller 3 or by their respective controllers, depending on the operating status and noise characteristics of different noise sources.

[0054] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0056] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0058] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0059] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. An active noise reduction device for wind turbine nacelles, characterized in that, include: A receiver (1) is installed in the wind turbine nacelle to collect noise; Noise reduction component (2), which is installed in the wind turbine nacelle to emit directional sound waves; The controller (3) is electrically connected to the receiver (1) and the noise reduction device (2) for receiving the noise signal collected by the receiver (1) and generating a reverse sound wave control signal. The noise reduction device (2) emits directional sound waves according to the reverse sound wave control signal. The protective component (4) includes a sound-receiving protective element (41), which includes a protective box (411). At least a portion of the sound-receiving element (1) is disposed inside the protective box (411). The sound-receiving end (11) of the sound-receiving element (1) faces the first side of the protective box (411). The first side of the protective box (411) is provided with a mesh plate (412) to allow sound to enter the protective box (411).

2. The active noise reduction device for wind turbine nacelles according to claim 1, characterized in that, The radio protection component (41) also includes a cooling fan (413), which is located in the protective box (411) and on the side of the radio end (11) away from the perforated plate (412). The airflow direction of the cooling fan (413) is set so that the air entering the protective box (411) flows from the perforated plate (412) side to the cooling fan (413) side.

3. The active noise reduction device for wind turbine nacelles according to claim 1, characterized in that, The sound-receiving protective component (41) also includes a hydrophobic sound-permeable membrane (414), which is sleeved on the sound-receiving end (11).

4. The active noise reduction device for wind turbine nacelles according to claim 1, characterized in that, The protective component (4) further includes a noise reduction protective component (42), which includes a protective box (421). At least a portion of the noise reduction component (2) is disposed inside the protective box (421). A protective door (422) is provided on one side of the protective box (421). The protective door (422) is hinged to the protective box (421). A plurality of through holes (423) are provided on the protective door (422). The through holes (423) are used for directional sound waves emitted by the noise reduction component (2) to pass through.

5. The active noise reduction device for wind turbine nacelles according to claim 1, characterized in that, It also includes a moving component (5), which includes a slide rail (51) and a slide base (52). The slide rail (51) is used to be installed on the inner wall of the wind turbine nacelle, and the slide base (52) is slidably installed on the slide rail (51). The sound receiver (1) and the noise reduction component (2) are both installed on the slide base (52).

6. The active noise reduction device for wind turbine nacelles according to claim 5, characterized in that, The slide (52) is provided with a rotating member (53), and at least one of the sound receiver (1) and the noise reduction member (2) is connected to the slide (52) through the rotating member (53). The rotating member (53) is used to adjust the orientation of the sound receiver (1) and / or the noise reduction member (2).

7. The active noise reduction device for wind turbine nacelles according to claim 6, characterized in that, The receiver (1) and the noise reduction component (2) are both connected to the slide (52) via the rotating component (53), and the receiving direction of the receiver (1) is consistent with the transmitting direction of the noise reduction component (2).

8. The active noise reduction device for wind turbine nacelles according to claim 5, characterized in that, There are multiple moving components (5), and each moving component (5) has a sound receiver (1) and a noise reduction component (2) on its slide (52). The multiple moving components (5) are respectively set at different noise sources in the wind turbine nacelle.

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