... directional spectrum based on finite data was first proposed by Barber (1954). The measured data were transformed by Fourier transform to obtain the cross-spectrum. At present, the estimation methods of directional spectrum for direct measurement mainly include direct Fourier transform method (Barber,1954...

... conducted on the moving point, even though it is crucial for ships in motion at forward speed. Consequently, it is one of the areas that can be identified as needing improvement. The Fourier transform is widely used to examine and record time-series data. During the last several decades, all prior efforts...

... into the superposition of plane waves as the incident sound field by spatial Fourier transformation. Then, the transmission of each plane wave component after incident on the solid plate is superimposed to obtain the total transmitted sound field according the angular spectrum method, the result is also verified...

... analytically by using the complex error function or the Fresnel integral. The reason why the causality is not satisfied is that the impulse response function is derived from the Fourier transform of the frequency characteristic (frequency response function) of the wave assuming a stationary process...

...). Therefore, a real-time monitoring of the offshore wind turbine becomes more and more important. Traditional signal processing methods, such as fast Fourier transform, require the signals should satisfy the hypotheses of stationary and linear. However, when analyzing non-stationary or non-linear signal...

... ABSTRACT: Many time-frequency analysis methods, such as Short Time Fourier Transform (STFT), Wavelet Transform (WT), Hilbert-Huang Transform (HHT), and the newly developed method -Short Time Prony Transform (STPT), have been developed to investigate the time- varying performance of structures...

... learning ireland extreme wave boundary wave height interaction extreme storm wave wave train equation spectrum wave event pseudo-spectral method scalability artificial intelligence stoke wave train fourier transform coefficient ocean A Pseudo-Spectral Method for Extreme Storm Waves...

... calculated via the embedment procedure had a very large inaccuracy on the prediction of the force peak height. subset elevation amplitude embedment procedure cylinder analytical signal time series fourier transform spectrum machine learning wave elevation upstream oil & gas hilbert...

... correlation fourier transform normalized frequency distribution Stochastic Sea-state Model based on Fourier Series Expansion Munehiko Minoura Department of Naval Architecture and Ocean Engineering, Osaka University, Osaka, Japan ABSTRACT A stochastic sea-state model expressed with the Fourier series...

... in steady state global elastic vibration known as springing and decrease the fatigue life of the floating bodies (Newman 1994, Kara 2000, Kara et.al. 2007). numerical result time domain itu-wave numerical result heave coefficient experimental result fourier transform deformable mode shear...

... of the absorber in still water fhs is the buoyancy force caused by the static water pressure on the moving absorber in still water. Taking the Fourier transform of Eq. 2, the behavior of the system can be analyzed in the frequency domain by Eq. 3 2 PTOhsrex FFFFmX 3 Where, the block letter represents the time...

... cylinder circular cylinder vorticity contour downstream cylinder 3 configuration fluid dynamics drag coefficient cylinder 1 strouhal number upstream oil & gas cylinder 3 vortex street cylinder fourier transform cylinder 2 coefficient downstream cylinder arrangement interference...

...-generated unsteady waves and then evaluating the wave amplitude function and the added resistance. resistance fourier transform complex amplitude ship-generated unsteady wave kashiwagi amplitude unsteady wave analysis direct measurement radiation wave linear superposition fn 0 fluid...

... eastern water taiwan characteristic typhoon tide data wavelet energy frequency domain time series tidal data fourier transform data quality energy distribution taiwan eastern water wavelet transform Study on the Characteristics of Storm Surge over Taiwan Eastern Waters by Wavelet...

... of the data. order response function wave height load index nonlinear ship response bispectral analysis skewness bispectrum time series wave pattern amplitude ship motion variance response function fourier transform time history data artificial intelligence input signal Bispectral...

... to realize. It also prove that the CWT indeed a suitable way to help explication and judgment the results from Sonic Echo (SE) method easily and precisely. INTRODUCTION Most of the techniques to detect defects are based on the using of the Fourier transform, which breaks down a signal into constituent...

... fourier transform subsea system platform mini tlp pitch response air gap upstream oil & gas floating production system fpso equation time domain coefficient mini tension leg platform Paper No. 2005-JSC-177 Kang Page:1 of 8 A Feasibility Study for Mini Tension Leg Platform Based...

... history cwt fourier transform wavelet transform technique offshore coherence analysis impact force data quality morlet wavelet frequency component freak wave wave force spectrum wavelet transform high impact force high frequency component Wavelet Transform Technique for Analysis...

... including current loads (non-linear), wind loads (non-linear), 1 st order wave loads (linear) and 2 nd order (non-linear) wave loads. It has been common practice to generate time series from spectra by using the Fast Fourier Transform (FFT) assuming stationary conditions. In many cases however...

... x and x+ x, and assuming the linear dispersion relation (2). In our study, calculation are made using velocity and pressure data at given location. Assuming linear waves, analysis may be conducted for each Fourier component independently. After Fast Fourier transform analysis, measured velocity...