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    基于IEC标准的风力发电机组声发射评估方法

    2008-02-25

     

    摘  要:研究了基于IEC 61400-11测量标准,确保风力发电机组声学噪声评估过程准确、可重复的声学测试分析方法,如风速的测量与转换、1/3倍频程分析的背景噪声修正、整风速下的声压级等;推导了适用于工程实践的由声压级估算声功率级的计算公式;并详细分析了基于窄带谱与心理声学的音调及能听度的计算过程。对基于上述原理所开发的测量评估系统于2007年7月在新疆达坂城2号风场进行了为期三周的现场验证性试验,各模块的分析精度与频响范围均达到IEC标准1级仪器的要求,所有指标的评估结果均与MEASNET成员单位所做结论保持一致。

     

    关键词:声学噪声;风力发电机;视在声功率;音调;IEC 61400-11

    中图分类号:TB52+2, TB533+.1       文献标识码:A       

    文章编号:1672-4984(2008)01-0005-05

     

    Acoustic emission assessment of wind turbines based on IEC standard

    SUN Lei1, QIN Shu-ren1, BO Lin1, XU Li-ping2

    (1.Test Center,Chongqing University,Chongqing 400030,China;

    2.School of Mechanical Engineering,Chongqing University,Chongqing 400030,China)

    Abstract: A novel measurement and analysis methods of noise emission assessments and verifications for the wind turbine generator system, which complies with specification IEC 61400-11, were investigated. Wind speed measurement and conversion, background correction for 1/3 octave analysis, and sound pressure levels at the integer wind speed which was recommended to ensure the consistency and accuracy of this procedure were included. A practical calculation formula for the sound power level measurement of wind turbine was induced from the sound pressure level. The tonality calculation and audibility calculation were analyzed in detail based on narrowband analyses and psychoacoustics. Experiments had been carried out in Xinjiang Dabancheng No.2 Wind Farm during July 2007 in order to validate the performances of the assessment system which was developed according to the above. The analysis precision and power responding range for each module of this system were satisifed with IEC requirements for type 1 instrument. And every assessment result of each indictor was in accord with that given by MEASENT member.

    Key words: Acoustic noise; Wind turbine generator; Apparent Sound Power; Tonality; IEC 61400-11       Editor:liyan




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