Search for dissertations about: "rainflow"

Showing result 1 - 5 of 6 swedish dissertations containing the word rainflow.

  2. 1. Rainflow Analysis of Switching Markov Loads

    Author : Pär Johannesson; Matematisk statistik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; actuarial mathematics; programming; operations research; Statistics; rainflow matrix; fatigue; vehicle load; hidden Markov model; random load; Markov model; Switching process; Statistik; operationsanalys; programmering; aktuariematematik;

    Abstract : Rainflow cycles are often used in fatigue analysis of materials for describing the variability of applied loads. Therefore, an important characteristic of a random load process is the intensity of rainflow cycles, also called the expected rainflow matrix (RFM), which can be used for evaluation of the fatigue life. READ MORE

  4. 2. Fatigue Assessment and Extreme Response Prediction of Ship Structures

    Author : Wengang Mao; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Fatigue assessment; extreme response; rainflow; narrow-band approximation; Laplace Moving Average model; transformed Gaussian; zero up-crossing response frequency; significant wave height; safety index; upcrossing spectrum; long term cumulative distribution function; ship routing.; transformed Gaussian;

    Abstract : In this thesis, a simplified narrow-band approximation model is proposed to estimate fatigue damage of ship structures, and an efficient method for extreme response predictions is also developed using upcrossing spectrums of ship responses. The proposed fatigue model includes two main parameters, significant stress range hs and zero upcrossing frequency fz. READ MORE

  5. 3. A statistical approach to multi-input equivalent fatigue loads for the durability of automotive structures

    Author : Gwenaelle Genet; Göteborgs universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Equivalent fatigue; uniaxial and multiaxial high cycle fatigue; multi-input variable amplitude loads; rainflow counting; Morel s model; Basquin s model; Gaussian process; Markov chain; Markov chain;

    Abstract : In the automotive industry, due to temporal and financial constraints, we need to strongly reduce the duration of the design phase, but still ensure reliability and robustness. Structures in service are often exposed to complex variable amplitude loads. READ MORE

  6. 4. Random Fatigue Analysis of Container Ship Structures

    Author : Wengang Mao; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; RAOs; rainflow counting; narrow band approximation; zero up-crossing response frequency; significant wave height; ship structure response; S-N curve; spatio-temporal model; safety index.; zero up-crossing response frequency;

    Abstract : .... READ MORE

  7. 5. Statistical Analysis of Crests and Maxima in Gaussian Seas

    Author : Jesper Rydén; Matematisk statistik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Geophysics; physical oceanography; meteorology; Geofysik; programmering; aktuariematematik; fysisk oceanografi; meteorologi; Statistik; operationsanalys; actuarial mathematics; programming; Statistics; operations research; Mathematics; Matematik;

    Abstract : An important problem in ocean engineering is to find distributions for characteristic wave parameters. For wind-generated water waves at deep water, a Gaussian distribution for the wave-surface elevation is considered a reasonable model. READ MORE