Results 21 to 30 of about 436,878 (286)
Numerical treatment of seismic accelerograms and of inelastic seismic structural responses using harmonic wavelets [PDF]
, 2007 The harmonic wavelet transform is employed to analyze various kinds of nonstationary signals common in aseismic design. The effectiveness of the harmonic wavelets for capturing the temporal evolution of the frequency content of strong ground motions is ...
Burrus C. S. +6 more
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An instantaneous frequency analysis method of stay cables
Journal of Low Frequency Noise, Vibration and Active Control, 2021 This paper presents and evaluates in detail a conjugate-pair decomposition method for tracking the instantaneous frequency of a vibration signal by processing only three (or more) most recent data points, and Probability Box theory was employed to obtain
Rumian Zhong, P Frank Pai
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Novel multivariate methods to track frequency shifts of neural oscillations in EEG/MEG recordings
NeuroImage, 2023 Instantaneous and peak frequency changes in neural oscillations have been linked to many perceptual, motor, and cognitive processes. Yet, the majority of such studies have been performed in sensor space and only occasionally in source space. Furthermore,
C. Vidaurre +7 more
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Improved EMD Using doubly-iterative sifting and high order spline interpolation [PDF]
, 2008 Empirical mode decomposition (EMD) is a signal analysis method which has received much attention lately due to its application in a number of fields. The main disadvantage of EMD is that it lacks a theoretical analysis and, therefore, our understanding ...
Kopsinis, Yannis, McLaughlin, Stephen
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Instantaneous Frequency Representation Used for CPA Laser Simulation
Applied Sciences, 2021 In the current study, we present a novel intuitive graphical method for the simulation of nonlinear effects on stretched pulses, characterized by a large time-bandwidth product.
Thomas Oksenhendler +2 more
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Advances in Mechanical Engineering, 2023 Mechanical equipment often works on variable speed condition, its corresponding vibration signal presents multi-component, modulation coupling with fast time-varying instantaneous frequency (IF), how to effectively compute IF and realize fasting varying ...
Lu Yan +7 more
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Adaptive Window Zero-Crossing-Based Instantaneous Frequency Estimation
EURASIP Journal on Advances in Signal Processing, 2004 We address the problem of estimating instantaneous frequency (IF) of a real-valued constant amplitude time-varying sinusoid. Estimation of polynomial IF is formulated using the zero-crossings of the signal.
Sekhar S Chandra, Sreenivas TV
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Machines, 2022 The vibration signal from the rotatory machinery condition monitoring under time-varying speed is usually amplitude-modulated (AM) and frequency-modulated (FM).
Yuexin Huang +4 more
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Research of Instantaneous Frequency Measurement Receiver
2020 Dynamics of Systems, Mechanisms and Machines (Dynamics), 2020 В данной работе рассматривается двухканальный МИЧ-приемник с двумя линиями задержки. Проведя математическое моделирование МИЧ-приемника, были получены зависимости СКО оценки частоты от задержки при различных соотношениях С/Ш на входе. Также получена зависимость вероятности ошибочного определения зоны неоднозначности, приводящей к увеличению СКО оценки ...
M. A. Kvachev +2 more
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One-shot 3d surface reconstruction from instantaneous frequencies: solutions to ambiguity problems [PDF]
, 2009 Phase-measuring profilometry is a well known technique for 3D surface reconstruction based on a sinusoidal pattern that is projected on a scene. If the surface is partly occluded by, for instance, other objects, then the depth shows abrupt transitions at
Heijden, F. van der +2 more
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