Research on damage location of GFRP composites based on Morlet wavelet analysis

Warming has strongly influenced the quantity and variability of natural disasters around the globe. This study aims to characterize the varying patterns between rising temperatures and climate-related natural disasters in China from 1951 to 2010. We examined the overall trend in the patterns of an 11-year cycle, and climate-related natural disaster responses to periods of rising and dropping temperature. We used Morlet wavelet analysis to determine the length of a temperature cycle period, and the arc elasticity coefficient to assess the number of climate-related natural disasters in response to the changing temperature. We found that: (1) the overall relationship between temperature and the number of climate-related natural disasters was positive; (2) however, on the cycle level, the pattern of climate-related natural disasters was found to be independent of temperature variation; (3) on the rise-drop level, temperature increases were associated with declines in the number of climate-related natural disasters. Moreover, as temperature decreased, the number of climate-related natural disasters increased substantially, such that temperature had a more considerable influence on the quantity of climate-related natural disasters during the temperature-drop period. Findings in this study can help enhance the dissemination of warning and mitigation efforts to combat natural disasters in the changing climate.

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Nucleosome location method based on morlet wavelet analysis scalograms investigation

2016 2nd International Conference on Advanced Technologies for Signal and Image Processing (ATSIP) ◽

10.1109/atsip.2016.7523097 ◽

2016 ◽

Cited By ~ 1

Author(s):

Rabeb Touati ◽

Imen Massaoudi ◽

Afef Elloumi Oueslati ◽

Zied Lachiri ◽

Noureddine Ellouze

Keyword(s):

Wavelet Analysis ◽

Morlet Wavelet ◽

Location Method ◽

Nucleosome Location

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The Research of Gantry Crane Girder Damage Problem by Modal Analysis Method

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.578-579.872 ◽

2014 ◽

Vol 578-579 ◽

pp. 872-876

Author(s):

Xiao Peng Nie ◽

Xin Gang Li ◽

Hong Wei Fan ◽

Ke Qin Ding ◽

Li Bin Xu

Keyword(s):

Numerical Simulation ◽

Wavelet Analysis ◽

Static Analysis ◽

Damage Identification ◽

Three Dimensional ◽

Gantry Crane ◽

Analysis Method ◽

Ansys Software ◽

Vibration Equation ◽

Damage Location

most crane damage identification of the work has focused on the static analysis, that can't explain whether the crane has a damage or not by this way. So the paper explained the modal signal to analysis this problem , Used 300 tons gantry crane’s beam for background and ANSYS software as a tool was used for numerical simulation. The purpose is to find difference between the damage beam of the crane and health one,because if there was a damage on the beam , the formations and frequency will be changed. This theory of analysis is based on the vibration equation. In order to illustrate it better, the wavelet analysis method as a tool has been used ,in this case the signal was filtered, we can judge the damage location from the three dimensional curve. The basic aim of this paper is to arrive at a better way to judge the damage.Through the above analysis, the results proved the author's idea, identify structural’s damage basically, but it still need further research.

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Morlet Wavelet Analysis of ML ≥ 3 Earthquakes in the Taipei Metropolitan Area

Terrestrial Atmospheric and Oceanic Sciences ◽

10.3319/tao.2014.09.09.01(t) ◽

2015 ◽

Vol 26 (2-1) ◽

pp. 83 ◽

Cited By ~ 1

Author(s):

Kou-Cheng Chen ◽

Jeen-Hwa Wang ◽

Kwang-Hee Kim ◽

Win-Gee Huang ◽

Kao-Hao Chang ◽

...

Keyword(s):

Wavelet Analysis ◽

Metropolitan Area ◽

Morlet Wavelet

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Damage Location in Beam and Plate Structures by Wavelet Analysis of Experimentally Determined Mode Shapes

Damage Assessment of Structures VI - Key Engineering Materials ◽

10.4028/0-87849-976-8.313 ◽

2005 ◽

pp. 313-320

Author(s):

Magdalena Rucka ◽

Krzysztof Wilde

Keyword(s):

Wavelet Analysis ◽

Mode Shapes ◽

Plate Structures ◽

Damage Location

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Damage Location in Beam and Plate Structures by Wavelet Analysis of Experimentally Determined Mode Shapes

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.293-294.313 ◽

2005 ◽

Vol 293-294 ◽

pp. 313-320 ◽

Cited By ~ 3

Author(s):

Magdalena Rucka ◽

Krzysztof Wilde

Keyword(s):

Wavelet Analysis ◽

Wavelet Transforms ◽

Mode Shapes ◽

Engineering Structures ◽

Plate Structures ◽

Continuous Wavelet Transforms ◽

Damage Location ◽

Structural Mode ◽

Crack Position ◽

Fixed Boundary Condition

In this paper a method for estimating the damage location in beam and plate structures is presented. A plexiglas cantilever beam and a plexiglas plate with one fixed boundary condition are tested experimentally. The dynamic response of the structures is analyzed using one and twodimensional continuous wavelet transforms of the structural mode shapes. The location of the crack is indicated by a peak in the spatial variation of the transformed response. The proposed wavelet analysis can effectively identify the crack position without knowledge of either the structure characteristics or its mathematical model. The practical application of the technique for civil engineering structures requires only the response of the structure.

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Analysis of Agile Canine Gait Characteristics Using Accelerometry

Sensors ◽

10.3390/s19204379 ◽

2019 ◽

Vol 19 (20) ◽

pp. 4379 ◽

Cited By ~ 2

Author(s):

Hasti Hayati ◽

Fatemeh Mahdavi ◽

David Eager

Keyword(s):

Wavelet Analysis ◽

Morlet Wavelet ◽

Frame Rate ◽

High Rate ◽

Measurement Unit ◽

Contributing Factors ◽

Severe Injuries ◽

Speed Reduction ◽

Morlet Wavelet Transform ◽

The Time Domain

The high rate of severe injuries associated with racing greyhounds poses a significant problem for both animal welfare and the racing industry. Using accelerometry to develop a better understanding of the complex gait of these agile canines may help to eliminate injury contributing factors. This study used a single Inertial Measurement Unit (IMU) equipped with a tri-axial accelerometer to characterise the galloping of thirty-one greyhounds on five different race tracks. The dorsal-ventral and anterior-posterior accelerations were analysed in both the time and frequency domains. The fast Fourier transform (FFT) and Morlet wavelet transform were applied to signals. The time-domain signals were synced with the corresponding high frame rate videos of the race. It was observed that the acceleration peaks in the dorsal-ventral accelerations correspond to the hind-leg strikes which were noted to be fifteen times the greyhound’s weight. The FFT analysis showed that the stride frequencies in all tracks were around 3.5 Hz. The Morlet wavelet analysis also showed a reduction in both the frequency and magnitude of signals, which suggests a speed reduction throughout the race. Also, by detecting abrupt changes along the track, the wavelet analysis highlighted potentially hazardous locations on the track. In conclusion, the methods applied in this research contribute to animal safety and welfare by eliminating the factors leading to injuries through optimising the track design and surface type.

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Characterization of Monsoonal Rainfall in the Sudano-Sahelian Zone of Northwestern Nigeria

Indonesian Journal of Earth Sciences ◽

10.52562/injoes.v1i2.261 ◽

2021 ◽

Vol 1 (2) ◽

pp. 123-135

Author(s):

Abdullahi Umar ◽

Saadu Umar Wali ◽

Ibrahim Mustapha Dankani

Keyword(s):

Wavelet Transform ◽

Wavelet Analysis ◽

Daily Rainfall ◽

Kendall Test ◽

Morlet Wavelet ◽

Rainfall Data ◽

Seasonal Rainfall ◽

Rainfall Characteristics ◽

Sahelian Zone

Wavelet transform has been underutilized in characterization of rainfall (Real Onset Dates and Real Cessation Dates) in the study area. This study aims at the characterization of monsoonal rainfall. Daily rainfall data of four stations for the period 1981-2018 were collected from Nigerian Meteorological Agency. The Intra-seasonal Rainfall Monitoring Index (IRMI) was generated and used in determining the RODs and RCDs. The Mann–Kendall test was used to detect trends of the rainfall characteristics. Wavelet transform was used in modelling RODs and RCDs. Findings revealed that RODs vary between stations. There is low (0.3 Spearman’s Rank r) correlation between latitudes and Early Cessations (ECs) of rains. The Morlet wavelet analysis revealed that from 1999 to 2018, there were more of EOs and NOs especially in Kano station. We conclude that from 1981 to 2018 there has been a minimal increase in the retreat dates of rainfall in the study area.

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Identification of solar periodicities in southern African baobab δ13C record

South African Journal of Science ◽

10.17159/sajs.2020/6813 ◽

2020 ◽

Vol 116 (7/8) ◽

Author(s):

Pieter B. Kotze

Keyword(s):

South Africa ◽

Spectral Analysis ◽

Wavelet Analysis ◽

Maximum Entropy ◽

Carbon Isotope ◽

Confidence Level ◽

Morlet Wavelet ◽

Sunspot Minimum ◽

Annual Carbon ◽

Schwabe Cycle

Spectral analysis using wavelet, Lomb–Scargle and maximum entropy techniques of the proxy rainfall record of northeastern South Africa based on annual carbon isotope (δ13C) data obtained from baobab trees for the period 1600 AD – 2000 AD show clear evidence of the presence of characteristic solar periodicities. Solar periodicities that were identified above the 95% confidence level include the ~11-year Schwabe cycle, the ~22-year Hale cycle as well as the 80–110-year Gleissberg cycle. A Morlet wavelet analysis of the δ13C data between 1600 AD and 1700 AD shows the effect of the Maunder sunspot minimum on both the Schwabe and Hale cycles during this time.

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