Author(s)

E. Caetano & A. Cunha

Abstract

Experimental identification of modal parameters on a full scale structure E. Caetano, A. Cunha Porto, Portugal ABSTRACT With the purpose of measuring vibrations on different types of structures, the Department of Civil Engineering of Porto University has developed a simple and low cost data acquisition system based on a personal computer and on two A/D conversion cards. Several computer codes have been developed in order to either sample, view and store series or to go into a more thorough analysis, allowing the construction of the most well-known spectral estimates and particularly the obtention of FRF estimates for different forms of excitation. For the identification of modal parameters, some single or multi-degree-of-freedom algorithms are also available. This system has been used to identify modal parameters from a concrete square 6.6x6.6m2 plate using an impact hammer as a source of excitation and a set of piezoelectric accelerometers as motion transducers. The great con

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