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2. 发明授权

KR101328997B1 연소 불안정 점검 방법 有权
标题翻译：检查燃烧不稳定性的方法
公开(公告)号：KR101328997B1
公开(公告)日：2013-11-14
申请号：KR1020120072068
申请日：2012-07-03
申请人： 한밭대학교 산학협력단
发明人： 차동진 , 송원준
IPC分类号： F02D45/00 , G01M15/08
摘要： The prevent invention provides a method for checking combustion instability at real time in multiple dimensions by calculating sound pressure, kurtosis, a damping coefficient of combustion dynamic pressure frequency components corresponding to a sound mode. The method for checking the combustion instability includes a step for measuring a combustion dynamic pressure signal generated in combustion; a step for determining a sound mode frequency by applying high speed Fourier transform to the combustion dynamic pressure signal; a step for extracting the combustion dynamic pressure signal in a sound mode frequency band by applying a wavelet filter or by passing through the band in which the sound mode frequency is a center frequency on the combustion dynamic pressure signal; a step for calculating an RMS sound pressure and the damping coefficient during a predetermined period on the combustion dynamic pressure signal in the sound mode frequency band; a step for comparing an RMS sound pressure with a first combustion instability threshold; a step for determining that the combustion instability is generated in case that the RMS sound pressure is more than the first combustion instability threshold; a step for calculating the kurtosis during the period on the combustion dynamic pressure signal in the sound mode frequency band in case that the RMS sound pressure is less than the first combustion instability threshold; a step for determining whether the kurtosis is larger than a standard value; a step for calculating the RMS sound pressure corrected by the kurtosis when the kurtosis is larger than the standard value and comparing that with a second combustion instability threshold; a step for determining that the combustion instability is generated when the corrected RMS sound pressure is larger than the first combustion instability threshold; a step for comparing the damping coefficient with the second combustion instability threshold; and a step for determining that the combustion instability is generated when the damping coefficient is under the second combustion instability threshold. [Reference numerals] (AA) Start;(BB) Pass through a band/a wavelet filter;(CC) End;(S202) Measure p(t);(S204) Determine a sound mode frequency;(S206) Extract p*(t) of the sound mode frequency band;(S208) Calculate P_rms;(S210) Calculate average movement of autocorrelation data, Determine autocorrelation;(S212) Calculate a hilbert-transform value;(S214) Calculate 瓘;(S218) Determine that the combustion instability is generated;(S220) Continue operation;(S224,S228) Calculate k
摘要翻译：本发明提供了一种通过计算声压，峰度，对应于声音模式的燃烧动态压力频率分量的阻尼系数来在多个维度上实时检查燃烧不稳定性的方法。用于检查燃烧不稳定性的方法包括测量在燃烧中产生的燃烧动态压力信号的步骤; 通过对燃烧动态压力信号应用高速傅里叶变换来确定声音模式频率的步骤; 通过应用小波滤波器或通过声音模式频率为中心频率的频带对燃烧动态压力信号提取声音模式频带中的燃烧动态压力信号的步骤; 用于在声音模式频带中的燃烧动态压力信号上计算RMS声压和预定时间段内的阻尼系数的步骤; 将RMS声压与第一燃烧不稳定阈值进行比较的步骤; 在RMS声压大于第一燃烧不稳定阈值的情况下，确定产生燃烧不稳定性的步骤; 在RMS声压小于第一燃烧不稳定阈值的情况下，计算在声模频带中的燃烧动态压力信号的期间的峰度的步骤; 确定峰度是否大于标准值的步骤; 当峰度大于标准值并与第二燃烧不稳定性阈值比较时，计算由峰度校正的RMS声压的步骤; 当校正的RMS声压大于第一燃烧不稳定性阈值时，确定产生燃烧不稳定性的步骤; 将阻尼系数与第二燃烧不稳定阈值进行比较的步骤; 以及当所述阻尼系数处于所述第二燃烧不稳定性阈值时确定所述燃烧不稳定性的步骤。（AA）开始;（BB）通过频带/小波滤波器;（CC）结束;（S202）测量p（t）;（S204）确定声音模式频率;（S206）提取p * （S210）计算P_rms;（S210）计算自相关数据的平均移动，确定自相关;（S212）计算希尔伯特变换值;（S214）计算瓘;（S218）确定产生燃烧不稳定性（S220）继续运行;（S224，S228）计算k

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