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Proceedings Paper

The Application Of Thermoelastic Stress Measurement To Both Modal Analysis And The Dynamic Behaviour Of Electrical Power Plant Structures
Author(s): R. G. Bream; B. C. Gasper; B. E. Lloyd; S. W. J. Page
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Paper Abstract

Structural dynamics for integrity assessment and condition monitoring of electrical power station plant can be approached using a variety of methods combining theoretical modelling with experimental measurements. In recent years experimental approaches have broadened to include non-contacting, full-field response measurement techniques using laser holography and more recently, stress pattern analysis from thermal emission (SPATE) to obtain the dynamic stresses. This paper presents the use of thermoelastic techniques for modal evaluation. The modal shapes of a welded 'T' section laboratory specimen obtained from the SPATE 8000 camera system are compared with results of finite element modelling, frequency response function and pulsed holographic techniques. In addition a compensating bellows unit taken from the gas circuit of a nuclear power station was dynamically tested in the laboratory using an electromagnetic shaker to excite resonances in the frequency range 300Hz to 400Hz. The dynamic stress data as recorded by the SPATE 8000 camera was compared with finite element model predictions. A further example describes a similar modal response investigation performed during a routine overhaul on an Advanced Gas Cooled Reactor gas circulator inner casing ring which is designed to isolate the stress concentrations present.

Paper Details

Date Published: 1 January 1987
PDF: 25 pages
Proc. SPIE 0817, Optomechanical Systems Engineering, (1 January 1987); doi: 10.1117/12.967418
Show Author Affiliations
R. G. Bream, Central Electricity Generating Board (England)
B. C. Gasper, Central Electricity Generating Board (England)
B. E. Lloyd, Central Electricity Generating Board (England)
S. W. J. Page, Central Electricity Generating Board (England)


Published in SPIE Proceedings Vol. 0817:
Optomechanical Systems Engineering
Daniel Vukobratovich, Editor(s)

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