Articles techniques et présentations

When a wineglass is touched with a wet finger along its edge, it vibrates at single frequency and you hear a clear sound. If the water is added into the glass, the sound pitch changes because the resonance frequency changes with the mass of the glass. When there are plural glasses with different quantity of the water, it becomes the musical instrument called the glass harp. Although the glass harp generates large sound, the vibration amplitude of the glass is small and it is hard to observe the vibration directly. Therefore, analysis of the vibration using COMSOL Multiphysics is useful. Such an analysis has indicated that a resonance frequency changes with the amount of water in a wineglass.