Modeling and analysis of Sompoton vibrator using cantilever beam model

• Main Author: Wong, Tee Hao
• Format: Thesis
• Language: English; English
• Published: 2014
• Subjects: ML459-1380 Instruments and instrumental music
• Online Access: https://eprints.ums.edu.my/id/eprint/38518/1/24%20PAGES.pdf; https://eprints.ums.edu.my/id/eprint/38518/2/FULLTEXT.pdf; https://eprints.ums.edu.my/id/eprint/38518/

Sompoton is one of the famous traditional musical instruments in Sabah. This instrument consists of several parts with the vibrator being the most important of all. In this research, the vibrator is modeled as a cantilever beam with uniformly distributed mass. Using this model, the fundamental frequency is analyzed using single degree of freedom system (SDOF) and exact analysis. The vibrator made from aluminum and brass is fabricated in different dimensions and is excited using constant air jet to obtain its fundamental resonance frequency. The fundamental frequency obtained from the experiment is compared with the theoretical values calculated based on cantilever beam model, SDOF system and exact analysis theories. It is found that the exact analysis gives closer match to the experimental results compared to SDOF system for aluminum vibrator. However, result for brass vibrator showed that SDOF system gives closer match compared to exact analysis. In both test, experimental and theoretical results exhibit the same trend but differ in magnitude. To overcome the differences in both theories, a correction factor is added to the theoretical formulation to account for the fabrication errors.