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Artykuły w czasopismach na temat „Transient Signal Analysis”

Autor: Grafiati

Data publikacji: 12 października 2024

Data aktualizacji: 31 lipca 2025

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1

Fan, Wei, Z. K. Zhu, Wei Guo Huang, and Gai Gai Cai. "Sparse Representation De-Noising Based on Morlet Wavelet Basis and its Application for Transient Feature Extraction." Applied Mechanics and Materials 526 (February 2014): 200–204. http://dx.doi.org/10.4028/www.scientific.net/amm.526.200.

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Signals with multiple transients are often encountered with much noise in engineering. The transient feature extraction has always been the key issue for signal analysis. A new signal de-noising method combining sparse representation and Morlet wavelet basis is proposed for signal de-noising and feature extraction. Simulation study concerning multiple transients signal shows the effectiveness of this method in transient feature extraction. The efficiency of this de-noising method is also verified by its application to extract fault signature for gearbox.

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Guillén, Daniel, Gina Idárraga-Ospina, and Camilo Cortes. "A New Adaptive Mother Wavelet for Electromagnetic Transient Analysis." Journal of Electrical Engineering 67, no. 1 (2016): 48–55. http://dx.doi.org/10.1515/jee-2016-0007.

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Abstract Wavelet Transform (WT) is a powerful technique of signal processing, its applications in power systems have been increasing to evaluate power system conditions, such as faults, switching transients, power quality issues, among others. Electromagnetic transients in power systems are due to changes in the network configuration, producing non-periodic signals, which have to be identified to avoid power outages in normal operation or transient conditions. In this paper a methodology to develop a new adaptive mother wavelet for electromagnetic transient analysis is proposed. Classification

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Alam, M. Shafiul, Md Shamimul Haque Chowdhury, and Muhammad Athar Uddin. "Power System Switching Transient Detection using Wavelet Transformed Based Signal Decomposition." IIUC Studies 7 (October 19, 2012): 241–48. http://dx.doi.org/10.3329/iiucs.v7i0.12270.

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Switching transient phenomena in Electric Power System develop several disturbances, sometimes very hazardous for the electrical equipment life, for the environment and for the human life. Switching transient phenomena produce over voltage, over current and electrical fields, which haven't to neglect. Several types of wavelet network algorithms have been considered for detection of power system switching transients. But both time and frequency information are accessible by multiresolution analysis (MRA). This paper presents a wavelet transform based multiresolution analysis of power system sig

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4

Wang, Li Di, Meng Wang, and Chun Cheng Han. "Research on Simulation System for Power Transient Signal Analysis Based on Wavelet Theory." Advanced Materials Research 457-458 (January 2012): 500–503. http://dx.doi.org/10.4028/www.scientific.net/amr.457-458.500.

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For the purpose of power system transient signal analysis, recognition and classification respectively ,this paper focuses on the study of electric power transient signal acquisition, signal preprocessing method and transient signal feature extraction .Based on the wavelet theory and some simulation experiments, the process of transient signal analysis is studied. And it makes a primary development of electric power transient signal analysis automatic simulation system by the simulation software. In this research, the wavelet denoising method is used and to extract the transient signal feature

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Liu, Wei, and Tian Lan. "Analysis on the Characteristics of Transient Signal Transmission Based on GaAs Materials." Materials Science Forum 663-665 (November 2010): 502–5. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.502.

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The GaAs photoconductive switch is an important device in the measurement of the signal of ultra high-speed. In this paper, the transmission model of transient signals on GaAs photoconductive material is given, and the experimental system of near-field detection is set up. It is gotten that the full width half magnitude of signal is about 2ps. Based on the testing result of delay-time-modulation method, the relationship between signal amplitude and the form of connection mode is analyzed and discussed. It is shown that the coupling of capacity is important to acquire the transient signal.

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6

NICHELATTI, MICHELE, PAOLO PETTAZZONI, and GIOVANNI PALLOTTI. "SOME MATHEMATICAL TOOLS FOR THE ANALYSIS OF BIOLOGICAL SIGNALS." Journal of Mechanics in Medicine and Biology 07, no. 02 (2007): 215–27. http://dx.doi.org/10.1142/s0219519407002236.

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The paper presents an informal review of some techniques available for signal analysis. In the interpretation of biomedical signals, the individuation of hidden transient phenomena in the spectrum can have a crucial role for diagnostic purposes. Since most biological signals are nonstationary, the Fourier transform is not sufficient to detect possible transient phenomena in the spectrum; therefore, some improvements in the Fourier transform technique have been carried out by means of window functions in the transformation kernel. Some of the most important features of recent developments in si

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7

Hinich, M. J. "Detecting a transient signal by bispectral analysis." IEEE Transactions on Acoustics, Speech, and Signal Processing 38, no. 7 (1990): 1277–83. http://dx.doi.org/10.1109/29.57556.

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8

Naval, Solanki* Mrs. Jyoti Pipariya. "ANALYSIS OF WAVELETS USED IN COMPRESSED SENSING FOR IMAGE COMPRESSION." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 6, no. 11 (2017): 467–72. https://doi.org/10.5281/zenodo.1066212.

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Wavelet analysis has engrossed more researchers in the field because of its analyzing ability for fastly solving and altering transient signals. Wavelet investigates its capability to analyze locally i.e. localized area can be analyzed for any larger signal. Wavelet analysis is can reveal data aspects which other techniques for image analysis may fail to notice aspects such as tendency, discontinuities of higher derivatives, breakdown points, and self-similarity.   Wavelet Theory has significance in image analysis, signal processing, transient signal analysis, communication systems. Also

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9

Prokhorov, D. A., A. Moraghan, and J. Vink. "Search for gamma rays from SNe with a variable-size sliding-time-window analysis of the Fermi-LAT data." Monthly Notices of the Royal Astronomical Society 505, no. 1 (2021): 1413–21. http://dx.doi.org/10.1093/mnras/stab1313.

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ABSTRACT We present a systematic search for γ-ray emission from supernovae (SNe) in the Fermi Large Area Telescope (LAT) Pass 8 data. The sample of targets consists of 55,880 candidates from the Open Supernova Catalogue. We searched for γ rays from SNe by means of a variable-size sliding-time-window analysis. Our results confirm the presence of transient γ-ray emission from the sources of non-AGN classes, including transitional pulsars, solar flares, γ-ray bursts, novae, and the Crab Nebula, which are projected near some of these SN’s positions, and also strengthen support to the variable sign

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10

Lai, Ying-Cheng, and Nong Ye. "Recent Developments in Chaotic Time Series Analysis." International Journal of Bifurcation and Chaos 13, no. 06 (2003): 1383–422. http://dx.doi.org/10.1142/s0218127403007308.

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In this paper, two issues are addressed: (1) the applicability of the delay-coordinate embedding method to transient chaotic time series analysis, and (2) the Hilbert transform methodology for chaotic signal processing.A common practice in chaotic time series analysis has been to reconstruct the phase space by utilizing the delay-coordinate embedding technique, and then to compute dynamical invariant quantities of interest such as unstable periodic orbits, the fractal dimension of the underlying chaotic set, and its Lyapunov spectrum. As a large body of literature exists on applying the techni

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11

Zhou, Qing, Xia Yang, Yong Jian Mao, and Hong Jian Deng. "Wavelet Analysis of Transient Signals of Structural Responses to Impulsive Loads." Advanced Materials Research 452-453 (January 2012): 1522–26. http://dx.doi.org/10.4028/www.scientific.net/amr.452-453.1522.

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Based on a brief introduction to elementary theory of wavelet analysis, the disadvantages of wavelet method and wavelet packet method are given. A new wavelet analysis procedure is proposed for decomposition and reconstruction of measured transient signals. This method can search by specific frequency paths, then overcomes the shortcomings of uniform frequency intervals in pure wavelet analyses and of large computational costs in common wavelet packet analyses. As examples, a signal-noise separation and a weak signal extraction are given to show the effectiveness of the new procedure.

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12

Lazzari, Eleonora Fripp, Adriano Peres de Morais, Maicon Ramos, et al. "A Comprehensive Review on Transient Recovery Voltage in Power Systems: Models, Standardizations and Analysis." Energies 16, no. 17 (2023): 6348. http://dx.doi.org/10.3390/en16176348.

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Electrical power systems are exposed to transient disturbances that change the voltage and current signals of the network, which can interrupt power and damage equipment. In high-frequency phenomena, it is essential to study the transient recovery voltage (TRV) to ensure the electrical insulation limits of circuit breakers are not violated, thus leading to a safe and reliable operation. Adequate models are crucial to achieving satisfactory results in the studies, according to the range of frequency of the transient being evaluated. This paper presents a comprehensive literature review of metho

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13

Luo, Zhong Hui, and Qi Jun Xiao. "Time-Frequency Features of Signal Analysis and its Application in Mechanical Fault Diagnosis." Advanced Materials Research 834-836 (October 2013): 1065–68. http://dx.doi.org/10.4028/www.scientific.net/amr.834-836.1065.

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The early fault detection of mechanical equipment is the technical support of automation equipment to run efficiently. Because of various faults have the characteristics of sudden, transient degeneration, so the traditional Fourier transform based on signal processing method can't meet the needs of the transient signal. This paper discusses time-frequency analysis technology of local wave from signal denoising, signal singularity detection and signal frequency band energy distribution analysis to extract the transient signal characteristics, and the motor bearing fault is put forward as an exa

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14

Li, H., H. Q. Zheng, and L. W. Tang. "Hilbert-Huang Transform and Its Application in Gear Faults Diagnosis." Key Engineering Materials 291-292 (August 2005): 655–60. http://dx.doi.org/10.4028/www.scientific.net/kem.291-292.655.

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Time-frequency and transient analysis have been widely used in signal processing and faults diagnosis. These methods represent important characteristics of a signal in both time and frequency domain. In this way, essential features of the signal can be viewed and analyzed in order to understand or model the faults characteristics. Historically, Fourier spectral analyses have provided a general approach for monitoring the global energy/frequency distribution. However, an assumption inherent to this method is the stationary and linear of the signal. As a result, Fourier methods are not generally

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15

Gao, Yuan Sheng, Qiang Chen, Qiang Sun, Zhong Chen, and Wen Hai Zhang. "The Impedance Calculation Methods Using Damped Sinusoidal Signal." Advanced Materials Research 860-863 (December 2013): 2003–6. http://dx.doi.org/10.4028/www.scientific.net/amr.860-863.2003.

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There are large number of transient signals will be produced when the operation mode is changed. And the frequency of the transient signals distributed in wide range. The most of them are damped and oscillated. The impedance is a popular feature in power system, and it has been widely used in relay protection and fault location. So the impedance calculation based on the damped sinusoidal signal have been the important way to diagnosis the fault, locate the fault and so on. But the methods used now are based on the fundamental impedance calculation theory, lacking theoretical basis. In fact, th

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16

Wang, Zhe Yuan, Li Jiang, Ming Hu Xu, and Wei Gang Zheng. "Application of Wavelet Transform in Transient Signal." Applied Mechanics and Materials 556-562 (May 2014): 4711–17. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.4711.

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In this paper, analog signals will be built upon the dynamic load of transient signal with the help of MATLAB simulation method and wavelet transform concept, and analyze it with the application of wavelet denoise method, whose good effects would be proved by simulation experiment. To dispel noise from noisy signal through wavelet resolution theory approach based on collection of simulation experiment and theory. In conclusion, wavelet kernel function and decomposition have direct effect to denoise. In this paper, we’ve made an analysis to electric power transient signal characteristics by com

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17

Wang, Y., J. Lin, and G. H. Zhou. "Analysis of DC offset Influence on Transient Signal." Journal of Physics: Conference Series 48 (October 1, 2006): 462–66. http://dx.doi.org/10.1088/1742-6596/48/1/088.

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18

Taşcıoğlu, Selçuk, Aykut Kalaycıoğlu, Memduh Köse, and Gokhan Soysal. "RF Fingerprinting Using Transient-Based Identification Signals at Sampling Rates Close to the Nyquist Limit." Electronics 14, no. 1 (2024): 4. https://doi.org/10.3390/electronics14010004.

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Radio frequency (RF) fingerprinting is regarded as a promising solution to improve wireless security, especially in applications where resource-limited devices are employed. Unlike steady-state signals, such as preambles or data, the use of short-duration transient signals for RF fingerprinting offers distinct advantages for systems with low latency and low complexity requirements. One of the challenges associated with transient-based methods in practice is achieving high performance while utilizing low-cost receivers. In this study, we demonstrate for the first time that the performance of tr

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19

Guers, Manton J. "Consistent physical frequencies in time-frequency analysis." Journal of the Acoustical Society of America 154, no. 4_supplement (2023): A209. http://dx.doi.org/10.1121/10.0023302.

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Wavelet transforms have been studied extensively for a wide variety of applications such as signal compression and signal denoising. Wavelet transforms have also been examined for the detection of transient signals. However, wavelet levels (and corresponding pseudo-frequencies) are inherently dependent on the sampling rate of the analyzed data. The work presented herein examines how wavelet analysis can produce inconsistent data representations for the same analytical signal digitized at different sampling rates. Results are compared to time-octave and other time-frequency representations to i

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20

IOINOVICI, ADRIAN, and SORIN COSTINER. "COMPUTER-AIDED ANALYSIS OF CYCLICALLY SWITCHING CIRCUITS WITH IMPLICIT CONTROLLED TRANSITION TIMES." Journal of Circuits, Systems and Computers 01, no. 04 (1991): 373–99. http://dx.doi.org/10.1142/s0218126691000136.

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The power electronics circuits can be seen as a subset of periodically switched networks. Their distinctive feature is the variable duration of the switching stages, dependent on implicit, threshold conditions. The paper presents a new computer-oriented approach for transient and steady-state analysis of this class of electronic circuits. The switching elements are extracted in a linear time-variable two-port, which is defined by its nodal equations. A set of modified nodal equations is obtained for describing the overall transient of the circuit. No small-signal approximations are required. T

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21

Gómez-Luna, Eduardo, Dixon E. Cuadros-Orta, John E. Candelo-Becerra, and Juan C. Vasquez. "The Development of a Novel Transient Signal Analysis: A Wavelet Transform Approach." Computation 12, no. 9 (2024): 178. http://dx.doi.org/10.3390/computation12090178.

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This paper presents a new method for the analysis of transient signals in the frequency domain based on the Continuous Wavelet Transform (CWT). The proposed case study involves test signals measured from an electronic switch considering open and close operations. The source is connected to inductive, resistive, and capacitive loads. Resonance behaviors are introduced and compared with the Discrete Fourier Transform (DFT). Multiple factors, such as reliability, repeatability, high noise attenuation, and the smoothing of the analyzed spectrum, are considered in this study. This proposed study hi

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22

Mishra, Sanhita, Sarat Chandra Swain, and Ritesh Dash. "Switching transient analysis for low voltage distribution cable." Open Engineering 12, no. 1 (2022): 29–37. http://dx.doi.org/10.1515/eng-2022-0004.

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Abstract Low voltage cable is primarily connected from the transmission system to several household applications. It is quite common that switching transient in the power system during the energization of the high voltage and low voltage cables have a very crippling effect on the cable as well as the power system components. Hence, an experiment has been performed in the laboratory with a low voltage cable-connected motor system. The experimental results have been validated in the simulation platform, and they are capable of predicting the transient behavior during power cable energization. Th

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23

Wang, Wan Jin, and Kui Feng Chen. "Research of the Transient Signal Recognition Based on Empirical Mode Decomposition." Applied Mechanics and Materials 548-549 (April 2014): 1173–78. http://dx.doi.org/10.4028/www.scientific.net/amm.548-549.1173.

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This paper introduces the empirical mode decomposition (EMD) method of the basic theory, problems and means to solve. Apply the approach to mechanical vibration signal containing a transient pulse processing and analysis carried out, and the wavelet time-frequency analysis methods are compared, the results show that it can effectively decompose nonlinear and non-stationary vibration signals, and has a self-adaptive, and in the time domain and frequency domain have better resolution capabilities, and the component with a more clear physical meaning. Due to its diversity of showing the results,

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24

Chen, Man, and Biao Ma. "Fault Diagnosis of Wet-Shift Clutch Based on STFT and Wavelet." Advanced Materials Research 301-303 (July 2011): 1560–67. http://dx.doi.org/10.4028/www.scientific.net/amr.301-303.1560.

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The paper analyzes the failure mechanism of the wet shifting clutch, and puts forward the concept that the deformation of the clutch friction plate leads to the irregular collision between the driving and driven sides of disengaged clutch and accordingly forms the transient pulse signal; the short-time Fourier analysis on the vibration signals of failed clutch obtained via test proves such concept. The transient pulse signal in the relatively strong background signal is clearly extracted through the wavelet decomposition after zero setting, and an efficient wet shifting clutch fault diagnosis

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25

Zheng, Chen, Qionglin Li, Shuming Liu, Shuangyin Dai, Bo Zhang, and Yajuan Liu. "Power Quality Transient Disturbance Diagnosis Based on Dynamic Large Convolution Kernel and Multi-Level Feature Fusion Network." Energies 17, no. 13 (2024): 3227. http://dx.doi.org/10.3390/en17133227.

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Power quality is an important metric for the normal operation of a power system, and the accurate identification of transient signals is of great significance for the improvement of power quality. The diverse types of power system transient signals and strong characteristic coupling brings new challenges to the analysis and identification of power system transient signals. In order to enhance the identification accuracy of transient signals, one method of power system transient signal identification is proposed based on a dynamic large convolution kernel and multilevel feature fusion network.

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26

Zhao, Bin, Guanghao Yu, Dong Wang, Lei Chen, and Jingning Ou. "Analysis of Transient Response of ZPW-2000A Jointless Track Circuit Considering Frequency Variation." Computational Intelligence and Neuroscience 2022 (April 30, 2022): 1–7. http://dx.doi.org/10.1155/2022/2257313.

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In order to accurately analyze the influence of electromagnetic transient signals on the jointless track circuit when the electromagnetic transient signal propagates in the rail, it is necessary to consider the frequency-variable load terminated in the ZPW-2000A jointless track circuit and the frequency-variable loss inside the rail. A method is proposed for calculating the transient response of transmission lines system with frequency-variable end load of jointless track circuit. Firstly, the transmission lines model of jointless track circuit is established, based on multiconductor transmiss

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Streck, Luiza, Thomas Roth, Andreas Noel, Peter Keil, and Andreas Jossen. "Analysis of Transient Current and Heat Flow during Voltage Holds: For Relaxed and Unrelaxed G/NMC811 Cells." Journal of The Electrochemical Society 171, no. 7 (2024): 070515. http://dx.doi.org/10.1149/1945-7111/ad5d1b.

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This study investigates the transient heat flow during voltage holds for multi-layer pouch G/NMC811 lithium-ion cells. When applying a voltage hold to estimate the amount of parasitic side reactions, there is first a transient phase followed by a steady state. According to the literature, reversible processes mainly influence the transient phase, while the steady state presents the side reaction current. This work investigates the contributions to the transient behavior, evaluating the thermal and electrical signals and deconvoluting the different parasitic side reactions. In addition, a compa

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Semyonov, E. V. "Analysis of the Structure of Nonlinear Distortions at Baseband Pulse Impacts Using Behavioral Nonlinear Models of Electrical Circuits." Journal of the Russian Universities. Radioelectronics 25, no. 2 (2022): 29–39. http://dx.doi.org/10.32603/1993-8985-2022-25-2-29-39.

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Introduction. Measuring harmonic distortions of a baseband pulse signal constitutes a problem due to the continuous nature of their spectrum. In order to obtain nonlinear distortions of a signal, a comparison should be conducted either of the object’s responses to two different test signals or those of the real object and its linearized model. However, such an approach does not distinguish between various physical factors that cause nonlinear distortions. This, as a result, complicates the optimization of devices.Aim. To develop an approach capable of determining the contribution of various so

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Semyonov, E. V. "Analysis of the Structure of Nonlinear Distortions at Baseband Pulse Impacts Using Behavioral Nonlinear Models of Electrical Circuits." Journal of the Russian Universities. Radioelectronics 25, no. 2 (2022): 29–39. http://dx.doi.org/10.32603/1993-8985-2022-25-2-29-39.

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Introduction. Measuring harmonic distortions of a baseband pulse signal constitutes a problem due to the continuous nature of their spectrum. In order to obtain nonlinear distortions of a signal, a comparison should be conducted either of the object’s responses to two different test signals or those of the real object and its linearized model. However, such an approach does not distinguish between various physical factors that cause nonlinear distortions. This, as a result, complicates the optimization of devices.Aim. To develop an approach capable of determining the contribution of various so

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30

Sharma, Aditya, and D. K. Palwalia. "Small Signal Modelling and Stability Analysis of a Grid Connected Inverted Based Microgrid." Indian Journal Of Science And Technology 17, no. 19 (2024): 2024–37. http://dx.doi.org/10.17485/ijst/v17i19.379.

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Objectives: This work focuses on the stability analysis of grid connected microgrids. It considers the impact of load disturbance and grid voltage change on voltage and current levels, as well as reactive and active power responses, is analysed. Methods: A comprehensive small-signal state-space model is developed for an inverter-based microgrid, incorporating submodules of inverters, phase-locked loops (PLLs), and LCL filters. The model is linearized around a stable operating point, and eigenvalue analysis is performed and validated through MATLAB/Simulink simulations. A current controller ope

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Homborg, A. M., P. J. Oonincx, and J. M. C. Mol. "Wavelet Transform Modulus Maxima and Holder Exponents Combined with Transient Detection for the Differentiation of Pitting Corrosion Using Electrochemical Noise." Corrosion 74, no. 9 (2018): 1001–10. http://dx.doi.org/10.5006/2788.

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A potentially powerful tool to detect and classify corrosion mechanisms is the analysis of electrochemical noise (EN). Data analysis in the time-frequency domain using, e.g., continuous wavelet transform (CWT) allows the extraction of localized frequency information, providing information on the type of corrosion, i.e., uniform or localized corrosion, from the EN signal. The CWT provides the opportunity to analyze changes in frequency behavior of EN signals over time. In the presence of transients generated by pitting corrosion that occur only during short instants of time, this is an importan

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Xu, Zhi, Gang Tang, and Mengfu He. "Peak-Based Mode Decomposition for Weak Fault Feature Enhancement and Detection of Rolling Element Bearing." Shock and Vibration 2020 (April 9, 2020): 1–10. http://dx.doi.org/10.1155/2020/8901794.

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Rolling element bearings are widely used in rotating machinery to support shafts, whose failures may affect the health of the whole system. However, strong noise interferences often make the bearing fault features submerged and difficult to be identified. Peak-based wavelet method is such a way to reduce certain noise and enhance the fault features by increasing the sparsity of monitored signals. But peak-based wavelet parameters need to be optimized due to the determined basis function and constant resolution, which will affect the efficiency of vibration signal analysis. To address these pro

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Wang, Kun, and Juntong Xi. "A method to estimate the transient fluid pressure of a piezoelectric inkjet printer using system dynamic analysis." Rapid Prototyping Journal 23, no. 6 (2017): 1130–35. http://dx.doi.org/10.1108/rpj-11-2015-0174.

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Purpose This paper aims to present a method based on dynamics to find the transient pressure at the nozzle area of a piezoelectric inkjet printer. This pressure responds to input signals of the piezoelectric driver deformation. The pressure at the nozzle is the boundary condition of the computational fluid dynamics model of the inkjet printer nozzle, and serves as the “bridge” between the piezoelectric driver actuation and the droplet generation of an inkjet printer. Design/methodology/approach The transient pressure was estimated using a fluid-solid coupling numerical model of the printerhead

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Plusquellic, J., A. Singh, C. Patel, and A. Gattiker. "Power supply transient signal analysis for defect-oriented test." IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems 22, no. 3 (2003): 370–74. http://dx.doi.org/10.1109/tcad.2002.807896.

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Ishikawa, Toru, Young Kyu Kwon, and Hiroshi Kuwano. "Fourier analysis for the isothermal capacitance transient spectroscopy signal." Applied Physics Letters 47, no. 10 (1985): 1097–99. http://dx.doi.org/10.1063/1.96341.

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Plusquellic, J. F., S. P. Levitan, and D. M. Chiarulli. "Digital IC device testing by transient signal analysis (TSA)." Electronics Letters 31, no. 18 (1995): 1568–70. http://dx.doi.org/10.1049/el:19951065.

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Wang, Fengli. "Pulsation Signals Analysis of Turbocharger Turbine Blades based on Optimal EEMD and TEO." Polish Maritime Research 26, no. 3 (2019): 78–86. http://dx.doi.org/10.2478/pomr-2019-0048.

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Abstract Turbocharger turbine blades suffer from periodic vibration and flow induced excitation. The blade vibration signal is a typical non-stationary and sometimes nonlinear signal that is often encountered in turbomachinery research and development. An example of such signal is the pulsating pressure and strain signals measured during engine ramp to find the maximum resonance strain or during engine transient mode in applications. As the pulsation signals can come from different disturbance sources, detecting the weak useful signals under a noise background can be difficult. For this type o

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Li, Quanchang, Xiaoxi Ding, Tao Wang, Mingkai Zhang, Wenbin Huang, and Yimin Shao. "Time-frequency synthesis analysis for complex signal of rotating machinery via variational mode manifold reinforcement learning." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234, no. 7 (2019): 1438–55. http://dx.doi.org/10.1177/0954406219897688.

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The transient signal caused by localized fault in rotating machinery always contains complex modulation information with heavy background noise distributed, which brings much difficulties for fault feature identification in the application of rotating machinery fault diagnosis. Focusing on the sensitive feature extraction from these complex signals, this paper proposes a novel variational mode manifold reinforcement learning (VM2RL) to adaptively construct time-frequency synthesis analysis for enhancement of transient features. First, a method of adaptive variational mode decomposition (VMD) i

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Zhang, Na, and Chun Wu Liu. "Selection and Design of Excitation Signal in Test System." Journal of Physics: Conference Series 2428, no. 1 (2023): 012003. http://dx.doi.org/10.1088/1742-6596/2428/1/012003.

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Abstract Both the test system and testing technology are inseparable from the selection and construction of the excitation signal. This paper shows excitation signals including transient excitation, harmonic excitation, random signal excitation, etc, which are commonly used in the time domain, frequency domain, and correlation analysis of the stimulus-response test. Moreover, the selection and design method of excitation signals in the test system is introduced based on the principle of signal analysis and system identification, combined with research and engineering practice experience. The a

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Leach, Andrew M., and Gary M. Hieftje. "Factors Affecting the Production of Fast Transient Signals in Single Shot Laser Ablation Inductively Coupled Plasma Mass Spectrometry." Applied Spectroscopy 56, no. 1 (2002): 62–69. http://dx.doi.org/10.1366/0003702021954223.

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Low sample consumption and high achievable spatial resolution combine to make laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) an attractive direct sampling technique for the analysis of solids. These desirable characteristics are best realized when the laser ablation system is operated in a single-shot fashion, in which each laser pulse produces a transient analyte signal. The temporal width of a single-shot LA analyte transient is inversely related to the best achievable signal-to-noise ratio (S/N). Thus, production of fast transient signals is an important considerati

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Starkhammar, Josefin, and Maria Hansson-Sandsten. "Evaluation of Seven Time-Frequency Representation Algorithms Applied to Broadband Echolocation Signals." Advances in Acoustics and Vibration 2015 (July 16, 2015): 1–13. http://dx.doi.org/10.1155/2015/342503.

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Time-frequency representation algorithms such as spectrograms have proven to be useful tools in marine biosonar signal analysis. Although there are several different time-frequency representation algorithms designed for different types of signals with various characteristics, it is unclear which algorithms that are best suited for transient signals, like the echolocation signals of echolocating whales. This paper describes a comparison of seven different time-frequency representation algorithms with respect to their usefulness when it comes to marine biosonar signals. It also provides the answ

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González-Franco, José Antonio, Alberto Ruiz, and Joaquín Ángel Ortuño. "Dynamic Potentiometry with an Ion-Selective Electrode: A Tool for Qualitative and Quantitative Analysis of Inorganic and Organic Cations." Chemosensors 10, no. 3 (2022): 116. http://dx.doi.org/10.3390/chemosensors10030116.

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A study of the transient potential signals obtained with a cation-selective electrode based on an ion-exchanger was carried out for solutions of the following individual cations at different concentrations: H+, Li+, Na+, K+, Rb+, Mg2+, Ca2+, choline (Ch+), acetylcholine (AcCh+), and procaine (Pr+). Three different general types of transient signals were distinguished depending on the value of the selectivity coefficient of the corresponding ion. A principal component analysis (PCA) was performed on the signals, finding that the qualitative identification of the corresponding ion from the score

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Huang, Zhidu, Shan Li, Yubin Feng, et al. "Research on Fault Location Technology of Overhead Line Based on Non-Contact High Sensitivity Distributed Traveling Wave." Journal of Nanoelectronics and Optoelectronics 17, no. 9 (2022): 1238–44. http://dx.doi.org/10.1166/jno.2022.3319.

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Aiming at the characteristics of overhead transmission line faults and starting from the research of the fault transient current and features of traveling wave signals of the grounded transmission tower when fault occurs, this paper analyzes non-contact distributed methods of acquiring fault traveling wave signals and then puts forward one. The transient traveling wave signal designed at the earth potential terminal of the transmission line tower allows the quick and accurate acquisition of the fault signal, improving the reliability and accuracy of the fault signal. At the same time, a series

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Li, Meng Da, Yu Bo Duan, and Yan Wang. "Time-Frequency Analysis Method in the Transient Power Quality Disturbance Analysis Application." Applied Mechanics and Materials 700 (December 2014): 99–102. http://dx.doi.org/10.4028/www.scientific.net/amm.700.99.

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This paper uses the method of S transformation to test the starting time, the end of the time, frequency and amplitude characteristics of common transient power quality signal disturbance. Through error analysis and simulation show that this method can accurately determine the disturbance occurred time and duration, and the identification and determination of disturbance can be simple and intuitive. It has the practical value and realistic significance to power quality signal interference analysis.

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Crenna, Francesco, Giovanni Battista Rossi, and Marta Berardengo. "Filtering Biomechanical Signals in Movement Analysis." Sensors 21, no. 13 (2021): 4580. http://dx.doi.org/10.3390/s21134580.

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Biomechanical analysis of human movement is based on dynamic measurements of reference points on the subject’s body and orientation measurements of body segments. Collected data include positions’ measurement, in a three-dimensional space. Signal enhancement by proper filtering is often recommended. Velocity and acceleration signal must be obtained from position/angular measurement records, needing numerical processing effort. In this paper, we propose a comparative filtering method study procedure, based on measurement uncertainty related parameters’ set, based upon simulated and experimental

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Gourgiotis, Alkiviadis, Gérard Manhès, Pascale Louvat, Julien Moureau та Jérôme Gaillardet. "Transient signal isotope analysis using multicollection of ion beams with Faraday cups equipped with 1012 Ω and 1011 Ω feedback resistors". Journal of Analytical Atomic Spectrometry 30, № 7 (2015): 1582–89. http://dx.doi.org/10.1039/c5ja00094g.

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This work is a first attempt to evaluate the potential use of 10<sup>12</sup> Ω amplifiers for transient signal isotope analysis. We showed how the transient signal duration influences the accuracy of the isotope ratio measurements.

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Collar, Steven, and Garth Frazier. "Acoustic array signal processing with the Stockwell transform." Journal of the Acoustical Society of America 151, no. 4 (2022): A36. http://dx.doi.org/10.1121/10.0010576.

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The Stockwell transform is a wavelet-like transformation based on a Fourier kernel weighted by a symmetric, frequency-scaled, time-shifted window function. Thus, it is suitable for analysis of non-stationary waveforms and transients in particular. In its discrete-time, orthogonal basis realization known as the discrete orthogonal Stockwell transform (DOST), it is possible to transform an N-point sequence in O(N log N) operations. In this presentation, we show how to perform direction-of-arrival and transient waveform estimation in the Stockwell basis in a manner that is similar to traditional

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Velandy, Jeyabalan. "Vector space representation of signals for transient signal analysis in transformers and shunt reactor." Electric Power Systems Research 140 (November 2016): 745–60. http://dx.doi.org/10.1016/j.epsr.2016.06.038.

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Durden, Stephen L., Victor A. Vilnrotter, and Scott J. Shaffer. "Assessment of Techniques for Detection of Transient Radio-Frequency Interference (RFI) Signals: A Case Study of a Transient in Radar Test Data." Eng 4, no. 3 (2023): 2191–203. http://dx.doi.org/10.3390/eng4030126.

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The authors present a case study of the investigation of a transient signal that appeared in the testing of a radar receiver. The characteristics of the test conditions and data are first discussed. The authors then proceed to outline the methods for detecting and analyzing transients in the data. For this, they consider several methods based on modern signal processing and evaluate their utility. The initial method used for identifying transients is based on computer vision techniques, specifically, thresholding spectrograms into binary images, morphological processing, and object boundary ex

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Xie, Jingsong, Wei Cheng, Yanyang Zi, and Mingquan Zhang. "Phase-based spectrum analysis method for identifying weak harmonics." Journal of Vibration and Control 24, no. 23 (2018): 5585–96. http://dx.doi.org/10.1177/1077546318760904.

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Fault characteristic frequency extraction is an important means for the fault diagnosis of rotating machineries. Traditional signal processing methods commonly use the amplitude information of signals to detect damages. However, when the amplitudes of characteristic frequencies are weak, the recognition effects of traditional methods may be unsatisfactory. Therefore, this paper proposes the phase-based enhanced phase waterfall plot (EPWP) method and frequency equal ratio line (FERL) method for identifying weak harmonics. Taking a cracked rotor as an example, the characteristic frequency detect

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