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Proceedings Paper

Laser Technology For Measuring Vibrational Power Transmission In Beam-Like Structures.
Author(s): J. R. Baker; N. A. Halliwell; J. L. Horner; R. G. White
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Paper Abstract

When attempting to control vibration in structures, the identification of the significant paths of vibration transmission from sources, through the structure to some point of interest is desirable. The concept of power flow, a vector quantity related to vibration energy transport, has been developed to allow evaluation of the significance of the various transmiision paths in a typical, complex structure. For flexural-wave, power flow measurements in beam-like structues, existing schemes employ two accelerometers, which suffer from inter-transducer phase differences, inducing measurement errors, particularly significant in the prescence of standing waves. This paper proposes a real-time, laser power flow meter with negligible inter-transducer phase differences and thus improved accuracy. Laser point velocity sensors offer remote, non-contact vibration measurements whose use will further extend employment of the technique to hot, light or inaccessible surfaces. Further improvement in measurement accuracy and simplification in the measurement scheme may be obtained by utilising a laser velocity gradient system to obtain normal-to-surface velocity spatial derivatives. A scheme is proposed for measuring longitudinal wave power flow in beams, in the prescence of flexural waves.

Paper Details

Date Published: 31 July 1989
PDF: 11 pages
Proc. SPIE 1084, Stress and Vibration: Recent Developments in Industrial Measurement and Analysis, (31 July 1989); doi: 10.1117/12.952915
Show Author Affiliations
J. R. Baker, The University, Highfield (UK)
N. A. Halliwell, The University, Highfield (UK)
J. L. Horner, The University, Highfield (UK)
R. G. White, The University, Highfield (United Kingdom)


Published in SPIE Proceedings Vol. 1084:
Stress and Vibration: Recent Developments in Industrial Measurement and Analysis

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