Sökning: "Fourier Transformation"

Visar resultat 6 - 10 av 25 uppsatser innehållade orden Fourier Transformation.

  1. 6. 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

  3. 7. Near-Field Measurement System for 5G Advanced Antenna System at mm-Wavelength

    Master-uppsats, Lunds universitet/Institutionen för elektro- och informationsteknik

    Författare :Bofei Wang; [2020]
    Nyckelord :Near-field; Measurement system; 5G; mm-wave length; antenna; Technology and Engineering;

    Sammanfattning : An antenna is one of the most fundamental elements of wireless communication systems. The radiation behavior of antennas is characterized with the aid of the farfield radiation pattern. In this thesis, a near-field antenna measurement system is designed to predict the far-field pattern of antenna operational frequency 28 GHz and 39 GHz. LÄS MER

  4. 8. Elektrisk styrning av mekaniska vibrationer

    Kandidat-uppsats, Uppsala universitet/Materialteori

    Författare :Carolina Nilsson; [2019]
    Nyckelord :;

    Sammanfattning : In this report a theoretical study have been made in the research field of Materials physics. The system under consideration is based on a similar system from an article. The system consists of a junction between a normal metal and a topological insulator, where one of the materials vibrates. LÄS MER

  5. 9. 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

  7. 10. A Comparison of Data Transformations in Image Denoising

    Kandidat-uppsats, Uppsala universitet/Statistiska institutionen

    Författare :Simon Michael; [2018]
    Nyckelord :Fourier Analysis; Principal Component Analysis; Singular Value Decomposition; Image Denoising;

    Sammanfattning : The study of signal processing has wide applications, such as in hi-fi audio, television, voice recognition and many other areas. Signals are rarely observed without noise, which obstruct our analysis of signals. Hence, it is of great interest to study the detection, approximation and removal of noise. LÄS MER