ANALYSIS OF SOUND AND TIMBRE OF DIFFERENT VIOLIN STRINGS UNDER DIFFERENT STRING PRESSING MODES BASED ON FFT

This study systematically investigates the effects of water level, cup height, and bottom diameter on the fundamental frequency of a glass water chime (liquid bell) system. By establishing a standardized experimental platform and applying FFT spectrum analysis, we obtained primary frequency data for three types of glass cups under various water levels. The results show that the resonance frequency increases monotonically and then tends to level off as the water level decreases. The bottom diameter of the cup is the most sensitive parameter affecting the frequency, while the cup height primarily determines the response range. Theoretical modeling agrees well with the experimental results, revealing the sound response mechanism under multivariable coupling in such liquid bells. This work provides an experimental and theoretical foundation for the acoustic optimization and engineering applications of water cup chimes and related liquid containers.