A new method is presented for identifying the local stiffness of a structure from vibration test data. The method is based on a projection of the experimentally measured flexibility matrix onto the strain energy distribution in local elements or regional superelements. Using both a presumed connectivity and a presumed strain energy distribution pattern, the method forms a well-determined linear least squares problem for local stiffness eigenvalues. These eigenvalues are directly proportional to the stiffness of individual elements or superelements, including the bending stiffness of beams, plates, and shells, for example. An important part of the methodology is the formulation of nodal degrees of freedom as functions of the measured sensor degrees of freedom to account for the location offsets which are present in physical sensor measurements. Numerical results are presented which show the application of the approach to example problems.
Experimental determination of local structural stiffness by disassembly of measured flexibility matrices
Experimentelle Bestimmung der örtlichen Steifheit von Strukturen durch Zerlegung gemessener Biegsamkeitsmatrizen
1995
11 Seiten, 5 Bilder, 10 Quellen
Aufsatz (Konferenz)
Englisch
British Library Conference Proceedings | 1995
|Method for Structural Model Update Using Dynamically Measured Static Flexibility Matrices
Online Contents | 1997
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