Numerical and experimental modal analysis of the setar
Keywords:Excitation points, Experimental modal analysis, Finite element models, Fixed points, Fluid-structure coupling, Minor components, MSC/NASTRAN, Orthotropic properties, Persians, Pre loads, Radiated sound, Structural details, Vibrating systems, Working conditions
AbstractStringed musical instruments are complex vibrating systems from both the structural and the fluid-structure coupling perspective. The direct sound of the strings is a minor component of the sound output, with most of the radiated sound generated by the body and cavity of the instrument. The setar is used mainly to play Persian classical music, called Dastgah. This instrument is played with the tip of the index fingernail, by strumming up and down. The excitation is imposed on a fixed point on the apex of the bridge, beside the notch where the first C4 string is passing, and the response is measured at 60 points all over the soundboard. The choice of the excitation point ensured that all prominent modes in the working condition of setar are properly excited. A finite element model of a setar was developed in MSC/NASTRAN taking into account structural details such as orthotropic properties, direction of the grains, non-ideal joints, and the effect of strings preload.
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