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Noise decibel value calculation method

A calculation method and decibel value technology, which is applied in complex mathematical operations, monitoring of wind turbines, and measurement of ultrasonic/sonic/infrasonic waves, etc., can solve the problems of cumbersome calculation methods and many materials, and achieve the effect of calculating noise values

Pending Publication Date: 2020-05-19
CHINA SINOGY ELECTRIC ENG
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Problems solved by technology

[0008] It can be seen that the existing technology requires more materials and the calculation method is cumbersome;

Method used

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  • Noise decibel value calculation method
  • Noise decibel value calculation method

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Embodiment 1

[0041] The present invention provides a kind of calculation method of noise decibel value, it is characterized in that, comprises the following steps:

[0042] 1) Calculate the sound pressure level at the noise test point P according to the noise intensity value at the sound source and the preset position of the noise test point P;

[0043] 2) Calculate the 1 / 3 octave center frequency according to the free layer velocity at the radius of the wind rotor, the height of the hub, and the value of the radius of the wind rotor;

[0044] 3) According to the 1 / 3 octave band center frequency, the number of blades, the air density, the blade chord length of the wind turbine, the radius of the wind rotor, the average turbulence intensity, and the straight-line distance from the center of the wind rotor to the predicted point, the suction turbulence noise 1 is calculated / 3 octave sound pressure level;

[0045] 4) The A sound level of each 1 / 3 octave band is obtained by superimposing mul...

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Abstract

The invention relates to the technical field of wind power generation, in particular to a noise decibel value calculation method which comprises the following steps: calculating the probability valueof wind resource wind speed distribution; using a single-machine power curve and a thrust coefficient; and calculating the decibel value of noise generated by the building sound source influenced by the fan according to the probability value of each wind speed, the single-machine power curve of each wind turbine generator and the mutual distance between the machine sites or the linear distance between the machine sites and the residential site. According to the method, the problems of complex calculation method and high workload in the prior art are solved, and the noise decibel value of the fan in the operation period can be simply and quickly calculated.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a method for calculating a noise decibel value. Background technique [0002] At present, wind turbines will generate noise when they are running. The noise of a typical modern wind turbine is mainly the starting broadband noise generated by the blades. The spectrum of the noise is similar to hissing. It is the noise emitted by the blades when they sweep the wind, especially the blade tips. The internal line speed can be as high as 200km / h, which is the largest part of the noise. Factors affecting aerodynamic noise include blade shape, tip speed ratio, pitch angle, blade trailing edge thickness, blade surface finish, and blade curvature distribution; [0003] In the prior art, the calculation of the decibel value of the fan noise generally requires the following conditions: [0004] 1. Analyze the wind resource data in the project area in detail, and sort out the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00G06F17/10F03D17/00
CPCG01H17/00G06F17/10F03D17/00Y02B10/30
Inventor 王玙张敬昂田源李岩王亮孙海生张称亮耿霏
Owner CHINA SINOGY ELECTRIC ENG
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