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Proceedings Paper

Frequency-Domain Analysis Techniques Developed For SPATE Response Signals
Author(s): Neil Harwood; William M. Cummings
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Paper Abstract

This paper discusses digital signal analysis techniques suitable for the measurement, by thermoelastic techniques, of full-field surface stress distributions on structures subjected to loading conditions which may not be of a uniform cyclic nature. A computer-aided test system has been programmed to acquire and analyse both sinusoidal and non-periodic signals from a SPATE 8000 infra-red scanning radiometer. The use of the system to measure stress and estimate damping under modal conditions is described. Sinusoidal data analysed by a digital technique together with results from a standard SPATE system are presented. The digital technique produced a clear reduction in edge effect compared with the data from the SPATE 8000 analogue instrumentation. Signal analysis procedures are presented which are suitable for the estimation of the quasi-static and modal behaviour of structures subjected to non-periodic, variable-amplitude loading. Stress patterns pre-dicted by the finite element method are also displayed for two simple structures and compared with thermoelastic data measured using wide-band random loading.

Paper Details

Date Published: 31 July 1989
PDF: 17 pages
Proc. SPIE 1084, Stress and Vibration: Recent Developments in Industrial Measurement and Analysis, (31 July 1989); doi: 10.1117/12.952914
Show Author Affiliations
Neil Harwood, National Engineering Laboratory (United Kingdom)
William M. Cummings, National Engineering Laboratory (United Kingdom)

Published in SPIE Proceedings Vol. 1084:
Stress and Vibration: Recent Developments in Industrial Measurement and Analysis
Peter Stanley, Editor(s)

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