The thesis discusses different examples of application of counting methods for fatigue damage estimation to the dynamic response signal of an electronic actuator prototype. The basics of signal analysis in time and frequency domain as well as random proces analysis are introduced. Methods used were developed for fatigue life estimation based on the time history of vibration loading. Real dynamic response signals and two synthetically generated signals were evaluated using specifically developed computer program. The algorithms used and the steps for generating synthetic signals are described in the study. Relations between signal characteristics and the accuracy of the damage intensity obtained by the counting methods is discussed, where the rainflow counting method is used as a reference. Results indicate that the effect of signal's probability density and frequency content on the accuracy of the frequency method estimation is not negligible.
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