【摘要】 介绍了Hilbert Huang变换(HHT)法的原理、内容和优越性,并用仿真信号进行实例分析,以验证其关键技术经验模态分解(EMD)的高效性、自适应性,以及其时频图能定量地描述时间与瞬时频率的关系。用HHT法对爆破震动信号进行分析与处理。研究结果表明:EMD能很好地按不同的时间尺度对信号进行分解,分解后的固有模态函数能反映信号本身所固有的特性;能将Hilbert能量谱中的信号能量清晰地表示在时间-频率-能量的分布图上;HHT法能有效地提取爆破震动信号的时频特征;HHT法比小波分析更具适应性,为爆破震动信号的分析与处理提供了新的研究思路与方向。更多还原

【Abstract】 The principle,contents and superiorities of HilbertHuang transform(HHT) were briefly introduced and example analysis was carried out with simulative signal on computer,and blasting vibration signal was analyzed and processed as an example as well.The results show that the empirical mode decomposition method which is the key of HHT method with different time scales can efficiently decompose the blasting vibration signal into intrinsic mode functions reflecting the intrinsic characteristics of the signal,and the signal energy can be clearly shown on the Hilbert energy spectrum with an energyfrequencytime distribution.Besides,the HHT method,which is more adaptive than other methods,can draw timefrequency characteristics from blasting vibration signal and provides a new research approach to blasting vibration analyzing and processing.更多还原