Detecting damage in vibrating structures with a scanning LDV

A. Z. Khan; Anthony B. Stanbridge; David J. Ewins

doi:10.1117/12.307730

1 June 1998 Detecting damage in vibrating structures with a scanning LDV

A. Z. Khan, Anthony B. Stanbridge, David J. Ewins

Proceedings Volume 3411, Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (1998) https://doi.org/10.1117/12.307730
Event: Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 1998, Ancona, Italy

Abstract

It has been demonstrated through experiments on steel and concrete laboratory structures that structural defects or faults, as determined by changes in the dynamic properties or response of structures, can be detected and located using a continuously-scanning Laser Doppler Vibrometer (LDV) if vibration to flex the defects can be induced and if the defects are such as to produce localised mode shape discontinuities. This paper describes such a defect detection method using a short linear LDV scan across the crack location. It has been observed that through cracks are easily detected in thin plates whereas narrow slots in a solid cantilever beam have no easily-identifiable effect on its mode shapes unless cracks extend more than half way through the thickness. Cracks in a reinforced-concrete beam were found to introduce marked and identifiable discontinuities in mode shapes. Keywords: LDV, Vibration, Scanning, Measurement, Cracks, Damage, Structures, Mode Shapes, Modal Analysis, Concrete Beams

Citation Download Citation

A. Z. Khan, Anthony B. Stanbridge, and David J. Ewins "Detecting damage in vibrating structures with a scanning LDV", Proc. SPIE 3411, Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (1 June 1998); https://doi.org/10.1117/12.307730

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available