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An instrument for detecting arbitrary peaks and troughs of a fluctuating stress signal
Author(s) -
Wastling M. A.,
Smith J. W.
Publication year - 1987
Publication title -
strain
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.477
H-Index - 47
eISSN - 1475-1305
pISSN - 0039-2103
DOI - 10.1111/j.1475-1305.1987.tb00632.x
Subject(s) - signal (programming language) , microprocessor , trough (economics) , stress (linguistics) , bridge (graph theory) , acoustics , structural engineering , computer science , engineering , electronic engineering , physics , electrical engineering , linguistics , philosophy , medicine , economics , macroeconomics , programming language
An instrument has been developed to detect arbitrary peaks and troughs of a fluctuating stress signal. This information is used to perform a fatigue life prediction. The instrument uses an analogue method of detecting peaks and troughs. This is considered to be cheaper and faster than the digital alternative. A microprocessor was employed to read peak/trough values from seven such channels and perform a ‘rainflow’ cycle count of the stress histories. The equipment has been tested on the Humber Suspension Bridge and has been shown to work satisfactorily.