爆破振动信号的HHT时频能量谱分析

TheHHTtime-frequencypowerspectrumanalysisof theblastingvibrationsigna

摘要: 采用希尔伯特-黄变换对爆破振动信号进行时频能量谱分析。经验模态分解中采用了极值点对称延拓消除端点效应,采用分段三次Hemite保形插值算法插值拟合消除欠包络现象以及筛分终止局部准则; 对于传统HHT 计算瞬时频率的负峰问题采用了标准化和直接正交法解决。采用了LabView 平台实现,提高了计算效率和实用性。
- 振动与波 /
- 时频能量谱 /
- 希尔伯特-黄变换 /
- 爆破振动信号 /
- 经验模态分解
Abstract: Theshort-timeFouriertransformcannotmeetthedifferentrequirementsofthehighand lowfrequencychangesofsignalandthewavelettransformcanbelimitedbythewaveletbaseweselect. Therefore,weuse HHTtoanalysetheblastingvibrationsignalthroughthetime-frequency powerspectrum.IntheEMD,weusethesymmetricextendingofextremepointtoeliminatethe effectofendpoint.WeusethepiecewisecubicHermiteinterpolatingtoeliminatethephenomenondue totheenvelope,andadoptthelocalcriterionofsiftingtermination.Fortheproblemofnegativepeak incalculatingtheinstantaneousfrequencyinthetraditionalHilberttransform,weadoptthenormalizedHilbertandthedirectquadraturemethodtosolve. InalltheHHTanalysis,weusetheLabView platformtoachievewhichcanimprovecomputingefficiencyandpracticality,andweprovethatHHT isusefulfortheanalysisoftheblastingvibrationsignal.
- vibrationandwaves /
- time-frequencypowerspectrum /
- Hilbert-Huangtransform /
- blasting vibrationsignal /
- empiricalmodedecomposition