CN-122014517-A - Noise reduction device and method for wind generating set gear box braking system

CN122014517ACN 122014517 ACN122014517 ACN 122014517ACN-122014517-A

Abstract

The invention provides a noise reduction device and a noise reduction method for a wind generating set gearbox braking system, which belong to the technical field of wind power generation. One end of the shell is connected with the generator through a connecting disc with a first rubber medium, and the other end of the shell is respectively connected with a gear box caliper and a high-speed shaft through a second rubber medium and a third rubber medium, so that comprehensive vibration isolation is realized. The shell is hollow, and the inner wall is sequentially embedded with a metal layer, a sound absorbing medium and an external sound insulating medium so as to absorb and isolate noise. The shell is provided with a first sensor bracket for installing noise and a temperature sensor to extend into the shell, and a second sensor bracket for installing a first active noise reduction mechanism and a second active noise reduction mechanism. The device reduces noise from the source through the composite vibration reduction and sound insulation and absorption structure, and combines the sensor with active noise reduction to realize intelligent monitoring and accurate noise elimination, reduce the noise of a gear box braking system and improve the running environment of equipment.

Inventors

ZHANG GAO
ZHAO DENGLI
Xing Xianqi
LI JIXU
SUN PENG
CHEN XINYU
XIE LEI
Kou Jingyong

Assignees

中车山东风电有限公司

Dates

Publication Date: 20260512
Application Date: 20260416

Claims (10)

1. The noise reduction device of the wind generating set gear box braking system is characterized by comprising a shell (21), wherein a first end of the shell (21) is connected with a generator through a connecting disc (1); a first rubber medium (2) is arranged on the connection contact surface between the connecting disc (1) and the generator; One side part of the second end of the shell (21) is connected with a gear box caliper, and a second rubber medium (3) is arranged on a contact surface of the connection; the second end of the shell (21) is connected with the high-speed shaft end of the gear box, and a third rubber medium (4) is arranged on a contact surface of the connection; the shell (21) is of a hollow structure, and a gear box braking system is arranged in the hollow structure; the inner wall of the hollow structure is embedded with a metal layer (11), the metal layer (11) is sleeved with a sound absorbing medium (10), and the metal layer (11) is externally covered with a sound insulating medium (12).
2. A noise reduction device for a wind turbine generator system gearbox brake system according to claim 1, A first sensor bracket (5) is arranged at a position close to the first end of the shell (21); a noise sensor (9) and a temperature sensor (6) are arranged on the first sensor bracket (5); The induction end of the noise sensor (9) and the induction end of the temperature sensor (6) respectively extend into the shell (21) and are used for inducing noise information and temperature information in the shell.
3. A noise reduction device for a wind turbine generator system gearbox brake system according to claim 1, The shell (21) is also provided with a second sensor bracket (15); the second sensor bracket (15) is provided with a first active noise reduction mechanism (8) and a second active noise reduction mechanism (14).
4. A noise reduction device for a wind turbine generator system gearbox brake system according to claim 3, characterised in that the housing (21) is provided with a first through hole (7), the first through hole (7) being opposite to the first active noise reduction means (8).
5. A noise reduction device for a wind turbine generator system gearbox brake system according to claim 3, characterised in that the housing (21) is provided with a second through hole (13), the second through hole (13) being opposite to the second active noise reduction means (14).
6. The noise reduction method is characterized by being used for performing noise reduction on a noise reduction device of a wind generating set gearbox brake system, and comprises the following steps: S101, connecting a first end of a shell with a generator through a connecting disc, wherein a first rubber medium is arranged on a connecting contact surface between the connecting disc and the generator; the second end of the shell is respectively connected with a gear box caliper and a gear box high-speed shaft end surface, a second rubber medium is arranged on the connecting contact surface of the shell and the gear box caliper, and a third rubber medium is arranged on the connecting contact surface of the shell and the gear box high-speed shaft end surface; S102, installing a first sensor bracket at a position close to a first end of a shell, inserting sensing ends of a noise sensor and a temperature sensor into the shell through the shell, installing a second sensor bracket on the shell, and installing a first active noise reduction mechanism and a second active noise reduction mechanism on the second sensor bracket; S103, setting the sampling frequency of data acquisition to 2560Hz, and carrying out wavelet noise reduction pretreatment and spectral eigenvalue analysis on the data acquired by the noise sensor through the industrial personal computer; S104, setting threshold values for sound pressure levels in different frequency bands, controlling the first active noise reduction mechanism and the second active noise reduction mechanism to be started when the decibel value in any frequency band exceeds the threshold value so as to perform noise reduction treatment on a sound source in the shell, and feeding back decibel value signals to a fan control system PLC at preset time intervals; s105, when the temperature inside the shell acquired by the temperature sensor exceeds a preset temperature threshold, reducing the rotating speed of the fan through the fan control system PLC, and feeding back temperature signals to the fan control system PLC at preset intervals; s106, when the decibel values in all the frequency sections are smaller than the threshold value, closing the first active noise reduction mechanism and the second active noise reduction mechanism; and S107, when the internal temperature of the shell is smaller than the preset temperature threshold value, the rotating speed of the fan is recovered to the normal rotating speed through the fan control system PLC.
7. The method of noise reduction according to claim 6, wherein, S103 specifically comprises the following steps: Configuring sampling parameters of a noise sensor through a data acquisition card, fixing the sampling frequency to 2560Hz, and converting an analog noise signal into a digital signal sequence; the industrial personal computer receives the digital signal sequence through the serial communication interface and stores the digital signal sequence into discrete time signal data blocks according to time sequence; Performing discrete wavelet transformation processing on the discrete time signal data blocks, and performing multi-scale decomposition by using Daubechies wavelet basis functions to obtain wavelet coefficients of each layer; Setting a threshold value based on noise statistics characteristics, performing soft threshold quantization processing on the wavelet coefficients, reserving coefficients larger than the threshold value, performing inverse discrete wavelet transformation on the quantized coefficients, and reconstructing a time domain signal after noise reduction; And performing fast Fourier transform on the time domain signal after noise reduction, calculating a frequency amplitude spectrum, dividing frequency segments according to equal bandwidths, and calculating sound pressure level values in each frequency segment as frequency spectrum characteristic values.
8. The method of noise reduction according to claim 6, wherein, S104 specifically comprises the following steps: S1041, segmenting a noise frequency range by adopting an equal bandwidth or variable bandwidth mode according to the noise frequency characteristic of a wind generating set gear box braking system during operation, and determining the frequency interval boundary of each frequency segment; s1042, setting a sound pressure level threshold value for each frequency segment respectively by combining a noise sound pressure level fluctuation range and a noise reduction target under the normal working condition of a gear box braking system; S1043, collecting an electric signal output by a noise sensor in real time through an industrial personal computer, and converting the electric signal into a sound pressure level value of a corresponding frequency band; s1044, comparing the real-time sound pressure level value of each frequency band with the corresponding threshold value set in S1042 one by one, and judging whether the sound pressure level of a certain frequency band exceeds the threshold value of the frequency band; S1045, when the sound pressure level of any frequency segment exceeds the threshold value, an active noise reduction control instruction is generated and sent to a driving unit of the first active noise reduction mechanism and a driving unit of the second active noise reduction mechanism to drive the noise reduction mechanism to start, and the sound pressure level value of each current frequency segment is packaged into a signal frame at each preset interval time length and sent to a fan control system PLC.
9. The method of noise reduction according to claim 8, S1042 specifically comprises the following steps: under the working conditions of no-load, rated load and typical variable load of the wind generating set, acquiring an original noise time domain signal of a gear box braking system through a noise sensor, and storing the original noise time domain signal in an industrial personal computer; The industrial personal computer performs wavelet noise reduction pretreatment and fast Fourier transformation on the stored original noise time domain signals, and calculates sound pressure level values of all preset frequency bands; for each preset frequency segment, calculating a normal noise sound pressure level mean value and a noise sound pressure level fluctuation standard deviation of the frequency segment based on sound pressure level values of all working conditions; calculating the operation sound pressure level threshold value of each frequency segment by combining the upper limit of the continuous noise sound pressure level allowed by the gearbox region and the statistical characteristics of each frequency segment; and storing each frequency segment and the corresponding operation sound pressure level threshold value thereof into the industrial personal computer in a key value pair mode.
10. The method of noise reduction according to claim 6, wherein, S106 specifically comprises the following steps: The industrial personal computer collects the decibel values of each frequency segment in real time, compares the decibel values with a preset sound pressure level threshold value of the corresponding frequency segment, and judges whether the decibel values of all the frequency segments are smaller than the threshold value; recording a comparison result in each monitoring period by the industrial personal computer, marking the comparison result as meeting the requirement if the decibel values of all the frequency segments are smaller than the threshold value, otherwise marking the comparison result as not meeting the requirement; The industrial personal computer is configured with a timer, and when the monitoring period mark meets the requirement, the accumulated time is accumulated, and when the mark does not meet the requirement, the accumulated time is reset; the industrial personal computer checks the accumulated time, and when the accumulated time reaches 30 minutes, a control instruction for closing the active noise reduction mechanism is generated; The industrial personal computer sends a control instruction to the driving units of the first active noise reduction mechanism and the second active noise reduction mechanism, and the driving units execute closing operation to stop the sound source counteracting action.

Description

Noise reduction device and method for wind generating set gear box braking system Technical Field The invention belongs to the technical field of wind power generation, and particularly relates to a noise reduction device and method for a wind generating set gearbox braking system. Background With the development of large-scale wind generating sets, the noise pollution problem of the sets is also becoming more serious. Wind turbine generator set noise is mainly derived from mechanical noise, electromagnetic noise and aerodynamic noise. Mechanical noise mainly comes from a gear box, a yaw system and a heat dissipation system, electromagnetic noise mainly comes from a generator and a converter, and aerodynamic noise mainly comes from wind sweeping sound of wind wheel blades. The related scheme generally adopts metal rigid butt joint with the connection of generator and gear box braking system, and the vibration that the generator operation produced directly transmits to the braking system casing through the metal contact surface, forms secondary noise after the casing forced vibration, and long-term vibration conduction can lead to connecting bolt to become flexible, and vibration can disturb braking system's braking precision moreover, aggravates the frictional wear of internal part. After the connection parts of the gear box calipers, the high-speed shaft ends and the brake system shell are connected, instantaneous impact vibration and continuous vibration of the high-speed shaft during braking of the calipers act on the shell, different vibration sources are overlapped to cause resonance of the shell, high-frequency noise is generated, and vibration transmission can lead to increase of gaps of the connection parts, so that collision noise and component loss are further aggravated. In order to detect noise, noise and temperature sensors are arranged on the brake system, the sensing process is easy to be interfered by external airflow and environmental noise to acquire signals, data distortion is caused, the running state inside the brake system cannot be truly reflected, and the accurate formulation of a follow-up active noise reduction control strategy is affected. Disclosure of Invention The invention provides a noise reduction device of a gear box braking system of a wind generating set, which can effectively reduce noise decibels of the gear box braking system. In order to effectively monitor the internal temperature and noise change of the noise reduction device, a temperature sensor and a noise sensor are installed in the device, and a temperature and noise early warning threshold value is set. The noise and sound pressure of the wind generating set can be effectively reduced, the unplanned downtime of the wind generating set can be reduced, and the service life of the component equipment is prolonged. The device comprises a shell, a first end of which is connected with a generator through a connecting disc; A first rubber medium is arranged on the connecting contact surface between the connecting disc and the generator; one side part of the second end of the shell is connected with the gear box caliper, and a second rubber medium is arranged on a contact surface of the connection; The second end of the shell is connected with the high-speed shaft end of the gear box, and a third rubber medium is arranged on a contact surface of the connection; The shell is of a hollow structure, and a gear box braking system is arranged in the hollow structure; the inner wall of the hollow structure is embedded with a metal layer, the metal layer is sleeved with a sound absorbing medium, and the outside of the metal layer is covered with a sound insulating medium. Preferably, a first sensor mount is mounted proximate the first end of the housing; a noise sensor and a temperature sensor are arranged on the first sensor bracket; the induction end of the noise sensor and the induction end of the temperature sensor respectively extend into the shell and are used for inducing noise information and temperature information in the shell. Preferably, the housing is further provided with a second sensor holder; The second sensor bracket is provided with a first active noise reduction mechanism and a second active noise reduction mechanism. Preferably, the shell is provided with a first through hole, and the first through hole is opposite to the first active noise reduction mechanism. Preferably, a second through hole is formed in the shell, and the second through hole is opposite to the second active noise reduction mechanism. The invention also provides a noise reduction method, which comprises the following steps: S101, connecting a first end of a shell with a generator through a connecting disc, wherein a first rubber medium is arranged on a connecting contact surface between the connecting disc and the generator; the second end of the shell is respectively connected with a gear box caliper and a gear box high-speed shaft e