机械工程学报
機械工程學報
궤계공정학보
CHINESE JOURNAL OF MECHANICAL ENGINEERING
2015年
1期
138-145
,共8页
广义经验模态分解%希尔伯特黄变换%瞬时频率%滚动轴承%故障诊断
廣義經驗模態分解%希爾伯特黃變換%瞬時頻率%滾動軸承%故障診斷
엄의경험모태분해%희이백특황변환%순시빈솔%곤동축승%고장진단
generalized empirical mode decomposition (GEMD)%Hilbert-Huang transform%instantaneous frequency%rolling bearing%fault diagnosis
希尔伯特黄变换(Hilbert-Huang transform, HHT)是一种优秀的时频分析方法，包含经验模态分解(Empirical mode decomposition, EMD)和希尔伯特变换(Hilbert transform, HT)两部分，通过EMD对信号进行分解，再对得到的内禀模态函数(Intrinsic mode function, IMF)进行HT解调。针对EMD存在的包络误差，模态混淆，端点效应以及HT易产生负频率等缺陷，提出一种改进的HHT方法(Improved HHT, IHHT)，IHHT包括广义经验模态分解(Generalized EMD, GEMD)和改进的直接正交(Improved direct quadrature, IDQ)解调，GEMD通过定义多种均值曲线，从得到的多个IMF中选择最优分量，从而保证了每阶分量的优越性；再采用改进的经验调幅调频分解和 IDQ 方法对信号进行解调，提高了分解和解调的精确性、抑制了端点效应的产生。将提出的方法应用于滚动轴承故障诊断，分析结果表明IHHT是一种有效的信号处理方法。
希爾伯特黃變換(Hilbert-Huang transform, HHT)是一種優秀的時頻分析方法，包含經驗模態分解(Empirical mode decomposition, EMD)和希爾伯特變換(Hilbert transform, HT)兩部分，通過EMD對信號進行分解，再對得到的內稟模態函數(Intrinsic mode function, IMF)進行HT解調。針對EMD存在的包絡誤差，模態混淆，耑點效應以及HT易產生負頻率等缺陷，提齣一種改進的HHT方法(Improved HHT, IHHT)，IHHT包括廣義經驗模態分解(Generalized EMD, GEMD)和改進的直接正交(Improved direct quadrature, IDQ)解調，GEMD通過定義多種均值麯線，從得到的多箇IMF中選擇最優分量，從而保證瞭每階分量的優越性；再採用改進的經驗調幅調頻分解和 IDQ 方法對信號進行解調，提高瞭分解和解調的精確性、抑製瞭耑點效應的產生。將提齣的方法應用于滾動軸承故障診斷，分析結果錶明IHHT是一種有效的信號處理方法。
희이백특황변환(Hilbert-Huang transform, HHT)시일충우수적시빈분석방법，포함경험모태분해(Empirical mode decomposition, EMD)화희이백특변환(Hilbert transform, HT)량부분，통과EMD대신호진행분해，재대득도적내품모태함수(Intrinsic mode function, IMF)진행HT해조。침대EMD존재적포락오차，모태혼효，단점효응이급HT역산생부빈솔등결함，제출일충개진적HHT방법(Improved HHT, IHHT)，IHHT포괄엄의경험모태분해(Generalized EMD, GEMD)화개진적직접정교(Improved direct quadrature, IDQ)해조，GEMD통과정의다충균치곡선，종득도적다개IMF중선택최우분량，종이보증료매계분량적우월성；재채용개진적경험조폭조빈분해화 IDQ 방법대신호진행해조，제고료분해화해조적정학성、억제료단점효응적산생。장제출적방법응용우곤동축승고장진단，분석결과표명IHHT시일충유효적신호처리방법。
Hilbert-Huang transform (HHT) is an excellent time-frequency analysis method, which contains empirical mode decomposition (EMD) and Hilbert transform (HT). A given signal is decomposed by EMD and then each of the obtained intrinsic mode functions (IMFs) is demodulated by HT. Aim to solve the problems of envelope errors, mode mixing and end effort of EMD method and negative frequency of HT, an improved HHT method (IHHT) is proposed, which contains generalized EMD (GEMD) and improved direct quadrature (IDQ) demodulation. By GEMD several different IMFs are obtained by defining different mean curves and in each rank the best IMF is selected. The improved empirical AM-FM decomposition and IDQ are used to demodulate the component. The proposed method improved the accuracy of decomposition and demodulation and restrained the end effort. IHHT is applied to rolling bearing experiment data and the analysis results indicate that IHHT is an effective signal processing method.
