ACOUSTICS CHARACTERIZATION OF BAMBOO VIOLIN AS MUSICAL INSTRUMENT

• Main Author: Ayu Agustiani Putri, Hardistya
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/44923
• Institution: Institut Teknologi Bandung

Bamboo violin has a unique sound quality that differs perceptually from common wooden violin. This research is focused on finding the physical parameters in order to get plausible explanations on that sound difference by conducting vibroacoustic analysis based on the results from physical experiment and numerical calculation (simulation). An automatic bow-moving machine was developed to provide a highly repeatable bowing strokes upon a string. A piezoelectric was put on the violin resonator surfaces for recording excitation force of bridge. Meanwhile, a microphone was put 50 cm from the resonator (soundbox) for recording sound pressure level produced by the violin. The measurement of both units was done simultaneously and then a transfer function was defined from the ratio of the units. For numerical calculation approach, only the violin’s body was considered. Using isotropic material parameters both bamboo’s and wooden’s resonator then simulated. From the result of experiment, it was found that bamboo and wooden violin have different output/input ratio, with the most different occured on the striking of D4 string. Further findings could be depicted from the resonator’s transfer function which resulting shifts in frequencies with different amplitudes. The result of numerical simulation showed lesser eigenfrequencies density of bamboo violin compared to wooden violin. The modes shape between the bamboo violin and the wooden violin were also different. These results could be the indicators hinting the differences between the sound of bamboo and wooden violin.