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Showing 1 to 12 of 12 for “"rainflow"”.
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Modeling Ambient Temperature Affected Photovoltaic Inverter IGBT Lifetimes With Rainflow Analysis
This manuscript details the modeling performed towards estimating lifetimes of IGBTs in PV inverters. Specifically, ambient temperature, solar irradiance, and load demand for a duration of a year were considered in modeling for a chosen integrated gate bipolar transistor (IGBT) from International …
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Transient and Spectral Fatigue Analysis for Random Base Excitation
… 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. The purpose was to compare the …
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Fatigue analysis for non-normal stochastic stress
… processes when both are analyzed by the rainflow counting method. Due to a lack of references on nongaussian process simulation, some initial effort is devoted to finding a simple way of generating nongaussian processes. In this study, in addition to mean and variance (the usual two …
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On stationary and nonstationary fatigue load modeling using autoregressive moving average (ARMA) models
… of the method is obtained through comparison of rainflow cycle distributions and resulting fatigue lives of original and simulated loadings. Due to the relatively small number of Fourier coefficients needed together with the use of ARMA models, a concise description of complex loadings is …
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ANALYTICAL FATIGUE DAMAGE CALCULATION FOR WIND TURBINE SUPPORT STRUCTURE
… turbine). Fatigue damage is quantified using a rainflow cycle counting method. By comparing the numerical simulation with the real recorded data, the analytical method proved to be reliable. For the cases considered, it was also observed that the fatigue damage of flexible-base foundations was …
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Development of a Field Monitoring System for the Northside Drive Bridge
… and output a stress range histogram using the rainflow cycle counting method. Using MATLAB, the stress range histogram from the structural monitoring system was used to generate an algorithm that outputs the remaining fatigue life of the bridge. Additionally, the preliminary measured strain …
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Identifying customer usage profiles of two-wheeled vehicles
… wheel forces are subsequently counted with the rainflow method. The validation was achieved by the comparison of measurements with wheel-load transducers. The second publication presents a three-part road classification system: first, a curve estimator was developed for identifying and …
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Fatigue crack growth in hydrogen pipeline steels
… pressure history is analyzed with the rainflow counting method and the crack depth calculations are carried out for a variety of API steels at load ratios for a given initial crack depth. The load ratio R equals where and are respectively the minimum and maximum stress intensity factors …
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Thermomechanical fatigue life investigation of an ultra-large mining dump truck tire
… of previous approaches.</p><p>In this study, a rainflow counting algorithm is used to consistently count strain reversals present in the complex multiaxial variable amplitude duty-cycle loads of the tire to assess fatigue damage on its material planes. A critical plane analysis method is then …
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Weight-optimised steel catenary risers and their applications in harsh deepwater environment
… by using specified bilinear S-N curve and rainflow cycle counting. Fatigue analysis results showed that the deepwater SCR with weight-optimised coating can meet the service life requirement. This suggested that weight-optimised coating as a mitigation method for deepwater SCR was effective …
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Analytical and computational methods for non-Gaussian reliability analysis of nonlinear systems operating in stochastic environments
… to the traditional linear models, e.g. the rainflow counting algorithm, especially in the long tail of early failure risks in the presence of intermittent extreme event loads, and make direct use of the statistics calculated in the first three parts. The four parts of this thesis fit …
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Entwicklung eines Lebensdauersensors : Entwicklung und Anwendung eines neuartiges Konzepts zur Aufnahme von Bauteilbeanspruchungen für Betriebsfestigkeitsanalysen
… data compared to cyclic pitch data based on Rainflow counting or cycle counting Algorithms, is the consideration of the shift in the mean stress. Successful testing of the data logging, measurement data pre-processing and wireless communication has been carried out on various test …