Application of Vibration Pattern Imaging to modal analysis; a comparison with full-field and point measurement techniques

R. G. Bream; B. C. Gasper; B. E. Lloyd; G. M. Everett

doi:10.1117/12.952925

31 July 1989 Application of Vibration Pattern Imaging to modal analysis; a comparison with full-field and point measurement techniques

R. G. Bream, B. C. Gasper, B. E. Lloyd, G. M. Everett

Author Affiliations +

Proceedings Volume 1084, Stress and Vibration: Recent Developments in Industrial Measurement and Analysis; (1989) https://doi.org/10.1117/12.952925
Event: Sira/Stress and Vibration: Recent Developments in Measurement and Analysis, 1989, London, United Kingdom

Abstract

The application of structural dynamics principles and procedures to power station plant integrity assessment and condition monitoring encompasses both theoretical and experimental methods. In recent years structural dynamic response measurement has been developed to include non-contacting full-field measurement techniques such as laser holography, Stress Pattern Analysis by measurement of Thermal Emission (SPATE), and more recently Vibration Pattern Imaging (VPI). These full-field techniques have complemented the conventional point measurement methods with a degree of structural dynamic visualisation which was historically felt to be unachievable. This paper presents an assessment of one of the latest techniques, Vibration Pattern Imaging, applied to modal testing utilising a specially designed 'T' section plate as the test specimen. A comparison of the dynamic behaviour of the plate was performed using the following techniques: (i) Vibration Pattern Imaging, (ii) finite element modelling, (iii) frequency response function measurement, (iv) pulsed holography, and (v) Stress Pattern Analysis by measurement of Thermal Emission. In addition, the capability of the VPI to operate as a non-contacting vibration transducer for use in a standard modal analysis is compared with the performance of a conventional piezoelectric accelerometer.

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R. G. Bream, B. C. Gasper, B. E. Lloyd, and G. M. Everett "Application of Vibration Pattern Imaging to modal analysis; a comparison with full-field and point measurement techniques", Proc. SPIE 1084, Stress and Vibration: Recent Developments in Industrial Measurement and Analysis, (31 July 1989); https://doi.org/10.1117/12.952925

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