The Hilbert-Huang transformation technique (HHT) absorbs the advantage of wavelet transformation 'multi- resolution, as well as overcomes the difficulty that il is needed to choose an appropriate wavelet function for wavelet transformation. This kind of dative decomposition method is suitable very much to analyze nonlinear and non-stationary process.
This paper, in detect of the cementation performance between metal and non-metal material, analyses the signal of non stationary process by the method of wavelet transform,extracts effectively feature parameter which is needed in performance detect and improves the accuracy and efficiency of the detect.
With the theories of the Morlet continuous and Daubechies discrete wavelet transforms, time-frequency spectrum and multi-scaling decomposition are applied into the wave study. Wavelet transform is of great importance to the wave study in nonstationary process, localization and nonlinearity.
Through the effects of the electromechanic characteristic parameter's change on the mechanic rotor have been considered,the electromechanic coupling system is composed of converter based on SPWM,cage type asynchronous machine and mechanic rotor has been established to study the rotor's nonstationary process.
In non-stationary processes, as machines are subjected to larger stress than that in stationary processes, monitoring of the non-stationary process is helpful to find early faults and prevent machines from severe broken.
This article discusses the functional structure of a nonstationary random process on the complete probability space with martingale theory and stochastic analysis process, and ob-tains Wiener processes, diffusion processes, Ito processes and a series of important results ofthe functional structure under Gauss Conditions. It is important for solving the optimum non-linear filters of such measurable stochastic process.
This article discussed the charaeteristics score of the functional structure of a nonstationary random process on the generalized complete probability space with martingale theory and stochastic process statistics method,and obtained wiener process,diffusion processes,Ito processes and a series of important results of analysis statistics of the functional structure under Gauss conditions. It is important for solving the optimum nonlinear filters of such measurable stochastic process.
The nonstationary process of the accumulation of ions of meteoric origin, which is caused by propagation of planetary waves at altitudes of the lower ionosphere, is considered.
The duration of the nonstationary process is shown to be short on a macroscopic time scale.
As a result of variations in this force due to the nonstationary process of dike intrusion in the axial zone of the ridge, disturbances of the stationary stress-strain state of the lithosphere migrate from the ridge.
The expression is based on distribution of the absolute maximum of the nonstationary process differentiable in the mean square representation.
A generalized fluctuation theorem is derived which relates the response function to a correlation of fluctuations of the unperturbed nonstationary process.
Because of the ship's maneuvers, changes such as course and speed, the ship motions in waves are regarded as a nonstationary random process, although the seaway can be considered as a stationary stochastic process.
The recording of the nonstationary random process at the output of the measuring channel of the NAVSTAR satellite system is analyzed.
Axis crossings and relative time of existence of a periodically nonstationary random process
The probability density of the fade duration of a nonstationary random process
Dispersion of the number of fades of a piece of nonstationary random process