Boundary conditioning for structural tuning using fuzzy logic approach

Technique of structural tuning is an important tool for structural engineer s, that facilitates in controlling the frequency response of the structure. The structural tuning method has immense potential in a variety of enginee ring applications. Since the quantification of the actual boundary conditio ns of engineering structures is extremely difficult, the tuning process bec omes inherently fuzzy in nature. In this study the Rayleigh-Ritz method alo ng with boundary characteristic orthogonal polynomials is employed to demon strate the influence of boundary conditions on the structural dynamic behav ior. The theory of fuzzy sets is applied to model the process of structural tuning since it has the capacity to absorb the fuzziness associated with o bservation and system definition. Structural tuning of a square plate is mo deled by Mamdani type fuzzy reasoning. The results obtained using the fuzzy model and those using the analytical model are in good agreement. (C) 2000 Elsevier Science Ltd. All rights reserved.