Sökning: "ocean wave spectrum"

Visar resultat 1 - 5 av 6 uppsatser innehållade orden ocean wave spectrum.

  1. 1. Improving the Accuracy of FFT-based GPGPU Ocean Surface Simulations

    Master-uppsats, Göteborgs universitet/Institutionen för data- och informationsteknik

    Författare :Jacob Eriksson; Joakim Wingård; [2022-12-01]
    Nyckelord :computer graphics; 3D graphics; real-time rendering; Fourier transform; FFT; simulation; GPGPU; interactive; ocean wave spectrum; oceanography;

    Sammanfattning : In this paper, we explore how the current state of the art in real-time ocean simulations can be improved in terms of simulation accuracy, while preserving performance. Current methods, both in academia and in the industry, simulate an ocean model in frequency space on the GPU, convert said model on an approximately frame-byframe basis to the spatial domain using the Fourier transform, and then read back the resulting heightfield to the CPU as input to the application’s physics engine. LÄS MER

  3. 2. Propagation of Radio Waves in a Realistic Environment using a Parabolic Equation Approach

    Master-uppsats, Linköpings universitet/Teoretisk Fysik

    Författare :Jonas Ehn; [2019]
    Nyckelord :Electromagnetic fields; wave propagation; radar; parabolic equation; split-step Fourier method;

    Sammanfattning : Radars are used for range estimation of distant objects. They operate on the principle of sending electromagnetic pulses that are reflected off a target. This leads to the propagation of electromagnetic waves over large distances. As the waves propagate, they are affected by several aspects that decrease the performance of the radar system. LÄS MER

  4. 3. Ocean Waves Estimation : An Artificial Intelligence Approach

    Master-uppsats, Mälardalens högskola/Akademin för innovation, design och teknik

    Författare :Andreas Ramberg; [2017]
    Nyckelord :Artificial Intelligence; Case-Based Reasoning; Encounter Angle; Encounter Spectrum; Feedforward Neural Network; Genetic Algorithm; Inverse Problem; Marine Vessels; Master Thesis; MATLAB; Model Parameter Estimation; Ocean Theory; Peak Period; Response Amplitude Operator; Ships; Significant Wave Height; Transfer Function; Wave Spectrum; Waves;

    Sammanfattning : This thesis aims to solve the mathematical inverse problem of characterizing sea waves based on the responses obtained from a marine vessel sailing under certain sea conditions. By researching this problem the thesis contributes to the marine industry by improving products that are using ocean behavior for controlling ship's dynamics. LÄS MER

  5. 4. Estimation and prediction of wave input and system states based on local hydropressure and machinery response measurements

    Master-uppsats, KTH/Optimeringslära och systemteori

    Författare :Quentin Laurent; [2016]
    Nyckelord :;

    Sammanfattning : Waves represent a big untapped energy source and many are endeavouring to develop Wave Energy Converters (WEC) to harvest this resource. The goal of this thesis, carried out with the young technology company CorPower Ocean AB, is to enable a better control of the company’s WEC by providing control strategies with a prediction of the input force on the device, also called excitation force. LÄS MER

  7. 5. Uncertainties introduced by the ocean surface when conducting airborne lidar bathymetry surveys

    Magister-uppsats, Lunds universitet/Fysiska institutionen; Lunds universitet/Atomfysik

    Författare :Torbjörn Karlsson; [2011]
    Nyckelord :Physics and Astronomy;

    Sammanfattning : A method for investigating how the ocean surface aects the accuracy of Airborne Lidar Bathymetry surveys, (ALB), due to environmental conditions, was developed. Computer graphic techniques were examined and utilized for construction of realistic ocean surfaces. LÄS MER