基于VMD-OV的去噪算法研究

Research on Denoising Algorithm Based on VMD-OV

针对VMD算法存在分解后有效模态选取困难的问题,提出了一种VMD和正交值结合的信号去噪方法(VMD-OV)。该方法首先利用VMD算法将信号分解成K个固有模态函数,然后分别计算每两个相邻模态的正交值,通过评估各相邻模态间的正交值最大值的变化情况来选取有效模态进行信号重构。实验结果表明:该方法可以有效地选取有效模态,对天然气管道泄漏信号的去噪有着较好的效果。

In view of the difficulty in selecting effective mode after the decomposition in VMD algorithm,a signal denoising method(VMD-OV)based on the combination of VMD and orthogonal value was proposed.In which,having the VMD algorithm used to decompose the signal into K intrinsic mode functions(blimfs),and then to calculate the orthogonal values of each two adjacent modes respectively,and finally to select the effective modes for signal reconstruction by evaluating the change of the orthogonal maximum values between these modes.The experimental results showed that,this method can effectively select an effective mode,and has a good effect on the denoising of natural gas pipeline leakage signal.