To reliably predict the endurance limit of a randomly loaded structural component, it is necessary to carry out measurements in actual operating conditions. As a result load/stress time histories and corresponding loading/stress spectra are obtained. In the case of short time history samples loading spectra have to be extrapolated. Additionally, in reliability analysis the scatter of loading spectra has to be determined. A new method of the scatter of loading spectra prediction has been developed. Its use is much more general than that of other existing methods. To verify the new method extensive load measurements on a fork-lift at various operating conditions have been carried out. The measured loading spectra has been well within the calculated confidence limits, which proves the appropriateness of the new method.
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