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THEORETICAL AND EXPERIMENTAL STUDY OF MODAL STRAIN ANALYSIS

✍ Scribed by L.Y. Yam; T.P. Leung; D.B. Li; K.Z. Xue

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
442 KB
Volume
191
Category
Article
ISSN
0022-460X

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✦ Synopsis

The relationship between the strain mode and displacement mode for vibrating elastic structures is derived. It is based on the idea that when a structure is subjected to dynamic loading, its strain response can be expressed by the superposition of contributions from the ''natural strain modes''. Both the natural strain and natural displacement modes represent the dynamic characteristics of a vibrating structure. By using the finite element method, it has been possible to relate the Strain Frequency Response Function (SFRF) to the Displacement Frequency Response Function (DFRF). The technique used in the modal strain test and the method used for parameter identification are described. An experimental study of the modal strain analysis of cantilever rectangular thin plates has been performed. This shows that the strain mode is more sensitive to local changes of the structure than the displacement mode.

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