![]() the multiplied frequencies and extended range of loads in the extrapolated LS). The problem of extrapolation can be illustrated by Figure 1, which presents both the transformation of a transfer array containing the LS from the flying session and the resulting changes of incremental load spectrum (ILS) (i.e. The problem of extrapolation of the LS from the short-term version (the LS collected during the flying sessions) to the long-term version (which is necessary to prove the operational life of the device) concerns many fields, such as wind power ( Moriarty et al., 2002 Veers and Winterstein, 1998), vehicle ( Rui and Wang, 2011) and machinery design ( Wang et al., 2011 O’Connor et al., 2002 Yamada et al., 2000) and, particularly, the aerospace ( Rodzewicz, 2008 Katcher, 1973). has to produce higher fatigue effect) and should be extended over a longer operational period. Such a LS should be more conservative than the LS observed during a flying session (i.e. The aim of this paper is to introduce the author’s method of developing the load spectrum (LS), which can be used in fatigue proof tests. Therefore, structure of heavier UAV classes should be investigated for proving their resistance to operational loads ( Jin et al., 2013 Rodzewicz, 2012). As always in aviation, one of the most important problems is strength and fatigue safety of the aircraft structure. The wide use of unmanned vehicles ( Everaerts, 2008 Norasma et al., 2019 Giordan et al., 2020 Goetzendorf-Grabowski et al., 2021) makes the problem of possible safety infringement caused by failures of the unmanned aerial vehicle (UAV) systems increasingly important. = coefficient depending on the type of array used in the modified P-M formula. ![]()
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