| Summary: | 碩士 === 國立屏東科技大學 === 機械工程系所 === 104 === There are many types of percussion instruments that can be categorized as the tuned and un-tuned; however, there is no proper sound quality evaluation method to quantify percussion instruments. This work aims to perform vibro-acoustic analysis on the harmonic sound plate (HSP) developed by adopting structural vibration analysis and optimum design method. The percussion sound spectrum from HSP can then be predicted and used to obtain objective evaluation index that will be compared with subjective evaluation. The evaluation methodology can also be adopted for other percussion instrument as well. This work applies finite element analysis (FEA) to determine structural vibration modes of HSP as well as the air-structure coupling modes. Both structural vibration modes and air-structure acoustic modes can be, respectively, interpreted. Through literature reviews on various musical sound quality evaluations for different musical instruments, this work builds up the objective evaluation indices, in particular for percussion instruments, such as pitch frequency, tonality, continuity and spectrum centroid. Sound simulation program module is developed to generate the sound response with the knowledge of sound spectrum information. The subjective evaluation is conducted by human ears to validate the effectiveness of the program module. Finally, by the integration of sound measurement and sound simulation program modules, the correlation between the subjective and objective evaluation results can be justified and applied to different percussion instruments.
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