...键词 ： EMD 端点效应 特征尺度延拓 轧机扭振信号 [gap=1183]Keywords : empirical mode decomposition(EMD);end effect;characteristic scale extension;torsional vibration signal of rolling mill ..
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The theory of HHT is studied and the decomposition accuracy is improved by adopting the proper method to deal with end effect. Simulation experiments show that it can get finer time-frequency structure compared with STFT,WVD and Choi-Williams.
分析了HHT算法的原理,采用了合适的端点效应处理方法提高了EMD的分解精度,通过仿真实验得到了语音信号更加精细的时频结构,并与STFT、WVD及Choi-Williams分布进行了对比,显示了HHT算法的优越性。
参考来源 - HilbertMarginal Effect is the basic causation of affect precision that HHT measure frequency. Apply symmetry extend can reduce error which be aroused by cubic spine interpolation.
端点效应是影响HHT方法频率测量精度的主要原因，利用对称延拓的方法有效的抑制三次样条插值端点效应引起的测量误差。
参考来源 - HHT方法在电力系统频率测量与分析中的应用研究The author researched the basic theory of Hilbert-Huang transform and the signification of IMF, analyzed the process of EMD algorithm, and pointed the endpoint effect along with its present resolves. Then use experiment simulation validated the availability of the algorithm.
本文研究了Hilbert-Huang变换的基本原理及瞬时频率和固有模态函数的含义,分析了经验模式分解的算法过程和其中的端点效应问题及现有的研究进展,并用仿真实例验证了该方法的有效性。
参考来源 - 基于Hilbert·2,447,543篇论文数据，部分数据来源于NoteExpress
但是经验模态分解方法存在严重的端点效应。
采用相似系数滤波方法可以压制这种假频和端点效应的干扰。
Similarity coefficient filtering may remove the noises due to aliasing and end point effect.
在已有的端点效应评价指标的基础上，给出了端点效应有效数据的定义。
On the basis of the old end effect evaluating indicator, the definition of the end effect valid data is defined.
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