Sökning: "power spectral density estimation"

Visar resultat 1 - 5 av 7 uppsatser innehållade orden power spectral density estimation.

  1. 1. Transient and Spectral Fatigue Analysis for Random Base Excitation

    H-uppsats, Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper

    Författare :Albin Bäckstrand; Prithviraj Madhava Acharya; [2019]
    Nyckelord :Spectral fatigue analysis; transient fatigue analysis; power spectral density PSD ; transfer function; base excitation; Dirlik s empirical formula; equivalent von Mises stress EVMS ; rainflow count; Wang and Brown s method; Dang Van equivalent stress; Palmgren-Miner rule;

    Sammanfattning : This thesis work gives an insight on how to estimate the fatigue damage using transient and spectral fatigue analysis for both uniaxial and multiaxial stress states in case of random vibration base excitation. The transient method involves a rainflow count algorithm that counts the number of cycles causing the fatigue damage, while the spectral method is based on probabilistic assumptions from which an expected value of fatigue damage can be estimated. LÄS MER

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

    Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Sofiane Kerbal; [2019]
    Nyckelord :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;

    Sammanfattning : 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. LÄS MER

  3. 3. Study of Vibration Transmissibility of Operational Industrial Machines

    Master-uppsats, Blekinge Tekniska Högskola/Institutionen för tillämpad signalbehandling; Blekinge Tekniska Högskola/Institutionen för tillämpad signalbehandling

    Författare :Sindhura Chilakapati; Sri Lakshmi Jyothirmai Mamidala; [2016]
    Nyckelord :Noise and Vibration; Spectral estimation; Vibration isolation; Vibration transfer;

    Sammanfattning : Industrial machines during their operation generate vibration due to dynamic forces acting on the machines. This vibration may create noise, abrasion in the machine parts, mechanical fatigue, degrade performance, transfer to other machines via floor or walls and may cause complete shutdown of the machine. LÄS MER

  4. 4. Development of a Vehicle Simulation Model Consisting of Low and High Frequency Dynamics

    Master-uppsats, Linköpings universitet/Fordonssystem

    Författare :Dennis Belousov; [2016]
    Nyckelord :Vehicle dynamics; simulation model; parameter estimation; road profile characteristics; power spectral density;

    Sammanfattning : As vehicle testing on existing vehicles is both time and resource consuming, the work of testing safety algorithms on vehicle is desired to be made more efficient. Therefore the goal of this thesis is to study and develop a vehicle simulation model that can simulate desired dynamics of existing and non-existing vehicles. LÄS MER

  5. 5. Local Impacts of Climate Change on Fortum´s Hydropower Production

    Master-uppsats, KTH/Vattendragsteknik

    Författare :Joakim Thanke Wiberg; [2016]
    Nyckelord :Global warming; climate variability; hydropower plants; spectral analysis;

    Sammanfattning : Background: Climate change and the consequences of global warming is probably one of the greatest issues of our time. Among other concerns, global warming is thought to have a great impact on hydrology worldwide. When the atmosphere warms up, river runoff patterns are altered. LÄS MER