This work aims at the establishment of a complete method for the prediction and evaluation of the acoustical characteristics of string instruments based on the vibrational behavior of the instruments individual parts. It is well known that the vibrational characteristics of the top plates of string instruments affect significantly their sound emission characteristics. In this respect, a method for the vibration analysis and characterization of the top plates of string instruments is reported. The method combines two experimental techniques, namely time-average Electronic Speckle Pattern Interferometry (ESPI) and impulse response analysis, as well as a theoretical finite element (FE) analysis of models of the top plates constructed by 3- dimensional laser scans. The method is applied to characterize the vibrational behavior of the top plates of various traditional Greek string instruments (Cretan lyre) but can be extended to any string instruments, such as guitars and violins. The resonance curves of the top plates extracted through impulse response measurements reveal the eigenfrequencies for each top plate, which are in excellent agreement with the observed ones with time-average ESPI. The vibration amplitude distributions (eigenmodes) obtained by time-average ESPI for each eigenfrequency are in good agreement with the predicted ones from the FE analysis.
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