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Wave scattering theory applied to inversion and design
(Doctoral theses at NTNU;2018:310, Doctoral thesis, 2018)The scattering of waves from objects can be used as a tool for both characterization and manipulation. The way waves interact and scatter from objects can give us information about their structure and composition. Additionally, ... -
Wave Slamming Forces on Offshore Wind Turbine Jacket Substructures
(Doctoral theses at NTNU;2018:237, Doctoral thesis, 2018)Currently, the development of offshore wind energy is mainly in shallow or intermediate water, where bottom-fixed substructures (e.g. monopiles and jackets) are mainly used. In harsh environmental conditions at certain ... -
Wave slamming forces on truss structures for wind turbines
(Master thesis, 2013)Generally the foundations of offshore wind turbines are steel truss structures which are exposed to wave slamming forces due to breaking waves, typically plunging breaking waves in shallow water. Calculations show that the ... -
Wave slamming forces on truss support structures for wind turbines
(Master thesis, 2012)This thesis is a study of the slamming forces from plunging breaking waves on truss support structures in shallow water. The main parts have been model testing and analysis on an existing 1:50 scale model of a truss support ... -
Wave- and wind-induced responses of the semisubmersible wind energy and flap-type wave energy converter based on experiments
(Journal article; Peer reviewed, 2017)This paper deals with a study of wave and wind induced responses of the combined energy concept SFC in operational and survival conditions based on experimental data. The measured responses that are studied include motions ... -
Wave-in-Deck Forces and Response of Semi-Submersibles
(Master thesis, 2017)In critical sea states, semi-submersibles may experience large negative air gaps in which incoming waves cause large slamming loads that may lead to severe structural deformations. Wave loads due to slamming are difficult ... -
Wave-Induced Accelerations of a Fish-Farm Elastic Floater: Experimental and Numerical Studies
(Chapter; Peer reviewed, 2014)Numerical simulations and experiments of an elastic circular collar of a floating fish farm are reported. The floater model without netting structure is moored with nearly horizontal moorings and tested in regular deep-water ... -
Wave-induced bottom shear stress estimation in shallow water exemplified by using deep water wind statistics
(Journal article; Peer reviewed, 2017)The paper provides a simple and analytical method which can be used to give estimates of the wave-induced bottom shear stress for very rough beds and mud beds in shallow water based on wind statistics in deep water. This ... -
Wave-induced current for long-crested and short-crested random waves
(Journal article; Peer reviewed, 2014)This paper provides a simple analytical tool which can be used to calculate the wave-induced current beneath long-crested (2D) and short-crested (3D) random waves. The approach is based on assuming the waves to be a ... -
Wave-induced nonlinear effects on a pontoon-type Very Large Floating Structures (VLFS)
(Doktoravhandlinger ved NTNU, 1503-8181; 2011:61, Doctoral thesis, 2011)The wave-induced nonlinear effects on the pontoon-type Very Large Floating Structure (VLFS) is investigated in this thesis. Typical dimensions of the pontoon-type VLFS such as a floating airport are 5000m in length, 2000m ... -
Wave-to-Wire Model of the Wave Energy Converter Bolt2: Control and Power Extraction with an All-Electric Power Take-Off System
(Master thesis, 2012)Fred Olsen is currently testing their latest wave energy converter outside of Falmouth Bay in England, preparing it for commercial exploitation at the Wavehub-project. Previous studies have shown that this device has ... -
Wavefield reconstruction for velocity–stress elastodynamic full-waveform inversion
(Peer reviewed; Journal article, 2020)Gradient computations in full-waveform inversion (FWI) require calculating zero-lag cross-correlations of two wavefields propagating in opposite temporal directions. Lossless media permit accurate and efficient reconstruction ... -
Waveform Analysis of Nonlinear Electric Loads Through Investigation of High and Low Sampling Frequency Data - Exploring the Possibility of Signature Analysis by Comparing Data Provided by an Advanced Measuring System and High Frequency Data Provided by an Oscilloscope
(Master thesis, 2018)This thesis investigates the data provided by the Home Area Network, HAN, port installed in all new Advanced Metering System, AMS, power meters. The data is provided over an M-bus protocol, with a low bandwidth of maximum ... -
Waveform Design for Software Defined Multifunctional RF Systems
(Master thesis, 2017)In this thesis, a study of multifunctional radio frequency (RF) systems implementing radar, communication, and electronic warfare (EW) is presented. Development of low cost and highly adaptable software defined radios ... -
Wavefront aberration correction in medical ultrasound imaging
(Doktoravhandlinger ved NTNU, 1503-8181; 2004:165, Doctoral thesis, 2004)Medisinsk ultralydavbildning er et relativt rimelig verktøy som er i utstrakte bruk på dagens sykehus og tildels også legekontor. En underliggende antakelse ved dagens avbildningsteknikker er at vevet som skal avbildes i ... -
Waveguide asymmetric long-period grating couplers as refractive index sensors
(Peer reviewed; Journal article, 2020)A highly sensitive integrated photonic transducer is designed by utilizing asymmetric long-period gratings on a silicon waveguide. These gratings are formed by periodic perturbation of the waveguide width, leading to ... -
Wavelength and orientation dependent capture of light by diatom frustule nanostructures
(Peer reviewed; Journal article, 2015)The ecological success of diatoms is emphasized by regular blooms of many different species in all aquatic systems, but the reason behind their success is not fully understood. A special feature of the diatom cell is ... -
Wavelength conversion and supercontinuum generation in silicon optical fibers
(Journal article, 2018)This paper describes the state of the art in wavelength conversion and supercontinuum generation using glass-clad silicon core optical fibers. Such semiconductor fibers have enjoyed considerable attention due to their ... -
Wavelet based feature extraction and visualization in hyperspectral tissue characterization
(Journal article; Peer reviewed, 2014)Hyperspectral images of tissue contain extensive and complex information relevant for clinical applications. In this work, wavelet decomposition is explored for feature extraction from such data. Wavelet methods are simple ... -
Wavelet based Video coding with optical flow for motion compensation
(Master thesis, 2011)In broadcasting environments intra-only video coding with JPEG 2000 has shownto provide many desired features along with high picture quality. However, thereis no exploitation of temporal redundancy, which can reduce the ...