By Dmytro Iatsenko (auth.)

ISBN-10: 2015030042

ISBN-13: 9782015030043

ISBN-10: 3319200151

ISBN-13: 9783319200156

ISBN-10: 331920016X

ISBN-13: 9783319200163

This paintings introduces a brand new technique for analysing measured signs: nonlinear mode decomposition, or NMD. It justifies NMD mathematically, demonstrates it in numerous functions and explains intimately tips to use it in perform. Scientists usually must be capable of examine time sequence facts that come with a fancy mixture of oscillatory modes of differing starting place, frequently infected via random fluctuations or noise. in addition, the elemental oscillation frequencies of the modes may possibly range in time; for instance, human blood move manifests at the least six attribute frequencies, all of which wander in time. NMD permits us to split those elements from one another and from the noise, with quick power functions in prognosis and diagnosis. Mat Lab codes for fast implementation can be found from the writer. NMD will probably turn out to be utilized in a wide diversity of applications.

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**Extra info for Nonlinear Mode Decomposition: Theory and Applications**

**Example text**

E. can be recovered with a relative error not exceeding some threshold). 20), from which one wants to find the individual analytic signals xνν;1 a (t) = ei(ν+ ν)t ei ϕ for each of the two tones. 11). 26). a a (t) − xνν;1,2 (t) generally depend on Obviously, the reconstruction errors xνν;1,2 the phase-shift ϕ. Therefore, in the corresponding expressions one should take the average over ϕ, which will be denoted as ... ϕ . 29) − ν)| . 2 26 2 Linear Time-Frequency Analysis Note that, in the present case, averaging over ϕ and time-averaging will give the same results; however, in general the TFR resolution properties can depend on time, and taking the mean over phase-shifts allows one to localize these errors at each t.

2). 3 Time-, Frequency- and Time-Frequency Resolution The notions of time, frequency and time-frequency resolutions have been often used in the preceding section, but were defined only briefly. In this section different resolution characteristics are considered in detail, and the definitions are made more precise. 21) ϕ ]. g. 21). 20) [27]. 20) represents an exception. This is because, without the phase shift introduced by ei φ , the analogy between sτ τ (t) and sνν (t) would be incomplete while, intuitively, the time and frequency domains should have equal rights.

Note, however, that many real signals have structure that is more suited to studies based on the WT. Additionally, one can often analyse a variety of time-series of different kinds using the same wavelet parameters, while for the WFT the window parameters should be adjusted for each particular case. Usually, the WT is also computationally cheaper due to the logarithmic frequency scale, requiring fewer bins to cover the same frequency range. On the other hand, the WFT generally has better resolution properties (see Sect.

### Nonlinear Mode Decomposition: Theory and Applications by Dmytro Iatsenko (auth.)

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