Essays about: "Fourier transform"

Showing result 1 - 5 of 192 essays containing the words Fourier transform.

  1. 1. Vibration analysis for condition monitoring of mechanical presses

    University essay from Lunds universitet/Industriell Produktion

    Author : Julia Runesson; [2019]
    Keywords : Vibration analysis; Predictive maintenance; Condition monitoring; Mechanical press; Press maintenance; PSD; DFT FFT; RMS; Kurtosis; Technology and Engineering;

    Abstract : In a world where the concept of just-in-time has been lifted outside of the manu-facturing world and onto the market, the increasing demand of luxury wares like cars is accompanied only by tougher industrial conditions and no room for error. Loss of productivity and decrease in efficiency can be devastating to any manufac-turing company in today’s market climate. READ MORE

  2. 2. Bioactivity testing of dental materials

    University essay from Uppsala universitet/Tillämpad materialvetenskap

    Author : Alexander Eriksson; [2019]
    Keywords : Bioactivity; bioactive glass; soaking experiment;

    Abstract :  Ever since Hench et al. first discovered bioactive glass in 1969, extensive interest was created because of the materials ability to chemically bond with living tissue. In this project the bioactivity of three different compositions of the bioactive glass Na2O-CaO-SiO2 have been studied. READ MORE

  3. 3. Combining Acoustic Echo Cancellation and Voice Activity Detection in Social Robotics

    University essay from KTH/Matematik (Avd.)

    Author : Anton Fahlgren; [2019]
    Keywords : ;

    Abstract : This thesis is partly a theoretical introduction to some basic concepts of signal processing such as the Fourier transform, linear time invariant systems and spectral analysis of random signals, both in the continuous and discrete setting. A second part is devoted to theory and applications of echo cancellation and voice activity detection in so called social robotics. READ MORE

  4. 4. Development of new criteria for train detection and evaluation in critical conditions

    University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Author : Sofiane Kerbal; [2019]
    Keywords : railway signaling; train detection; track circuit; shunt; frequency modulation; frequency-shift keying modulation; third-order harmonic; short-time Fourier transform; power spectral density estimation; cross-correlation;

    Abstract : Railway signaling is of paramount importance to ensure traffic management andsafety on the rail network. The main lines are divided into sections called ‘blocks’,which are governed by a fixed signal installation. To prevent trains from colliding,each block allows one train at once. READ MORE

  5. 5. Survival Analysis Using Time-Frequency Analysis of Heart Rate Variability During Exercise

    University essay from Lunds universitet/Avdelningen för Biomedicinsk teknik

    Author : Carl Sjögren; [2019]
    Keywords : Technology and Engineering;

    Abstract : Heart rate variability as an indicator of increased morbidity has been established in previous studies. It is defined by different frequency bands, corresponding to different biological mechanisms. This thesis aims to study heart rate variability indices in the time-frequency domain through extraction from the UK Biobank dataset. READ MORE