Sökning: "Fast Fourier Transformation"

Visar resultat 1 - 5 av 8 uppsatser innehållade orden Fast Fourier Transformation.

1. 1. A comparative performance analysis of Fast Fourier Transformation and Gerstner waves

   Kandidat-uppsats, Blekinge Tekniska Högskola/Institutionen för datavetenskap

   Författare :Morgan Westerberg; Oliver Olguin Jönsson; [2023]
   Nyckelord :Water simulation; Procedural methods; Ocean waves; Fast Fourier Transformation; Gerstner waves;

   Sammanfattning : Background:  As time moves on hardware is able to tackle heavier and more complex computations in real-time systems. This means that more realistic and stylistic environments can be computed. One of these environments is the ocean. LÄS MER

3. 2. Vibroacoustic Analysis of an OLTC Diverter Switch for Condition Monitoring : Time frequency analysis with Fourier and wavelet transform in combination with multivariate logistic regression for condition monitoring of OLTC diverter switch

   Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Avdelningen för systemteknik

   Författare :Simon Persson; [2023]
   Nyckelord :Wavelet transform; CWT; logistic regression; machine learning; ML; vibroacoustic analysis; time frequency analysis; tap changer; diverter switch; power transformer; classification; prediction; condition; vibrations; state prediction; Hitachi Energy;

   Sammanfattning : Vibrations are everywhere around us all the time and we often recognise them as sounds that we can hear and analyse with our brain. In this thesis, data that has been gathered from a diverter switch (DS) in a controlled environment, is analysed. LÄS MER

4. 3. Utilisation of hardwood in cross-laminated timber - A numerical study on vibrations in floors

   Uppsats för yrkesexamina på avancerad nivå, Lunds universitet/Byggnadsmekanik; Lunds universitet/Institutionen för byggvetenskaper

   Författare :Johannes Jonasson; Olle Karlsson; [2022]
   Nyckelord :hardwood; birch; beech; clt; cross-laminated timber; vibrations; floors; footfall; accelerations; Technology and Engineering;

   Sammanfattning : Cross-laminated timber (CLT) is an engineered wood product consisting of several layers of laminations bonded together with adhesives. In contrast to heavier construction materials, timber and other lightweight building materials are more prone to serviceability issues due to vibrations. LÄS MER

5. 4. Numeriska fouriertransformen och dess användning : En introduktion

   Kandidat-uppsats, Linköpings universitet/Tillämpad matematik; Linköpings universitet/Tekniska fakulteten

   Författare :Kristoffer Tondel; [2022]
   Nyckelord :Fast Fourier Transform; FFT; Discrete Fourier transform; DFT; Scientific Computing; Partial differential equation; PDE; Williamsons Runga-Kutta; Fast Fourier Transform; FFT; Diskreta fouriertransformen; DFT; Beräkningsmatematik; Partiella differential ekvation; PDE; Williamsons Runga-Kutta;

   Sammanfattning : The aim of this bachelor's thesis is to use three variants of the discrete Fourier transform (DFT) and compare their computational cost. The transformation will be used to numerically solve partial differential equations (PDE). In its simplest form, the DFT can be regarded as a matrix multiplication. LÄS MER

7. 5. Numerical analysis of aerodynamic damping in a transonic compressor

   Master-uppsats, KTH/Skolan för industriell teknik och management (ITM)

   Författare :Vincenzo Stasolla; [2019]
   Nyckelord :transonic compressor; flutter; vibration; CFD; transonic kompressor; fladder; vibration; CFD;

   Sammanfattning : Aeromechanics is one of the main limitations for more efficient, lighter, cheaper and reliable turbomachines, such as steam or gas turbines, as well as compressors and fans. In fact, aircraft engines designed in the last few years feature more slender, thinner and more highly loaded blades, but this trend gives rise to increased sensitivity for vibrations induced by the fluid and result in increasing challenges regarding structural integrity of the engine. LÄS MER