2pSA7. An algorithm to count fatigue cycles in an arbitrary loading waveform.

Session: Tuesday Afternoon, June 17

Author: R. P. Kendig
Location: Energy Systems Technol. Development, Westinghouse Sci. and Technol. Ctr., Pittsburgh, PA 15235, kendig.r.p.@wec.com


The purpose of this investigation is to introduce a different algorithm for counting fatigue cycles due to an arbitrary acoustic or vibration excitation. The scope of this study is limited to a mathematical analysis with comparisons to several standard fatigue counting methods. The proposed algorithm, based on the Hilbert transform, processes a time history representing the loading condition to generate the number of cycle-counts with their corresponding amplitudes. The approach is general, is accurate within any desirable degree of accuracy, and is amenable to modern signal processing. The utility of the algorithm is demonstrated through comparisons to standard fatigue cycle-counting practices. [See NOISE-CON Proceedings for full paper.]

ASA 133rd meeting - Penn State, June 1997