本論文係利用ANSYS軟體模擬小號內部容積之聲場分析，將分析出之自然頻率與442標準頻率、錐管聲場理論進行確認分析數據是否正確，並以不同的分析類型加以確認ANSYS在聲場領域上其分析數據之可靠度。由本研究模擬之設定方法，分析出之數據與442標準頻率相近，由此可知此設定方法其可行性很高。再進行調節小號各調節管，觀察各調節管對整體自然頻率之影響，並對小號的幾何設計進行修正，以達到更好的音高。The sound field of a trumpet is investigated by using a finite element software - ANSYS. The natural frequencies from the finite element analysis, the 442 standard frequencies, and the theoretical analysis of the conical tube are compared to verify the correctness and the reliability of FEM. These data are closed but with about 1%~4% errors are found between the 442 standard and the results from ANSYS. Then, for slightly adjusting the natural frequencies, the effects of various control tubes of trumpet are studied. Furthermore, the influence of revising trumpet's geometry is also presented to obtain better pitches.
