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  • Modelling of rainflow matrices with a maximum likelihood method
    Klemenc, Jernej ; Fajdiga, Matija
    A structure that operates in real operating conditions is usually exposed to dynamic loads. So an evaluation of the influence of dynamic loads to fatigue damage of the structure should also be ... carried out. To evaluate fatigue damage of the structure, a time history of structure load should first be acquired. This can be done by means of experiments or simulations. When the time history of load is known, it should be transformed into a form that is suitable for prediction of fatigue damage. Fatigue damage of the structure depends heavily on load cycles that are included in the load time history. Load cycles are extracted from the load time history with different counting methods. A rainflow counting method is widely used in automotive industry. Therainflow counting method results in a matrix of relative frequencies of load cycles, which are included in the load time history. With an approximation of the rainflow matrix by a continuous probability density function, random fluctuations of relative frequencies are reduced and an extrapolation of probability of load cycles that were not actually recorded is made possible. In a paper a method of modelling of rainflow matrices by means of a mixture of Gaussian functions will be presented. Unknown parameters of the normal mixture will be estimated with a maximum likelihood method. Effectiveness of this method will be presented and discussed on an example of load time histories of a real structure.
    Source: "Europe and the Second Century of Auto-mobility" : congress proceedings. Conference B, Vehicles for the next decade (Str. B/75-84 (SAITS 01055))
    Type of material - conference contribution
    Publish date - 2001
    Language - english
    COBISS.SI-ID - 4442395

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