On the new method of the loading spectra extrapolation and its scatter prediction

摘要

Loading spectra are of paramount importance for service life prediction and durability approval.To obtain the necessary data,load measurements or simulations have to be carried out.The influence of variable operating conditions upon loading spectra should be taken into acount as well.The present paper deals with the properties of a general multi-modal probability density function (p.d.f.) for load ranges of stationary random processes.Additionally,a new,more general method for prediction of the scatter of loading spectra is presented.However,the main emphasis of the article is the proof that the procedures mentioned above hold also in the case of variable operating conditions.To illustrate the advantages of the new method compared to the existing one,the data obtained by measurements on a fork-lift a various operating conditions have been analysed by both methods independently.