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題 名 | 線性及凸型陣列換能器聲場特性與陣元安排之關係=Sound Field of Linear of Convex Array Transducers with Various Element Arrangements |
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作 者 | 宋家驥; 劉宣志; | 書刊名 | 國立臺灣大學工程學刊 |
卷 期 | 74 1998.10[民87.10] |
頁 次 | 頁81-94 |
分類號 | 334.6 |
關鍵詞 | 陣列換能器; 線性陣列; 凸型陣列; 聲束成形; Array transducer; Linear array; Convex array; Beam forming; |
語 文 | 中文(Chinese) |
中文摘要 | 本文針對平面及凸形陣列換能器陣元不同的幾何尺寸及安排方式對聲的影 響, 做一綜合的探討,其中包括:單一陣元大小與陣元中心距離 (pitch) 對聲場分布的影 響,換能器短軸寬度的改變致使主軸上能量集中位置及壓力分布產生的變化,每一陣元的副 切割 (subdice) 數量對旁瓣 (sidelobe) 的影響, 以及弧形陣列與直線陣列的聲場差異等 。計算結果顯示:陣元大小、間距及中心距離對主瓣和旁瓣及衍生瓣 (grating lobe) 的產 生具有交互性的影響;短軸寬度對聚集及主軸壓力分布有很大的影響,在寬度較小時,能量 將在預期聚焦點之前集中。隨著寬度增加,能量方能愈接近所給定的聚焦點,但不同聚焦深 度亦有不同影響。副切割對於旁瓣具有抑制的效果,當切割數愈多,旁瓣將愈明顯的降低。 |
英文摘要 | The numerical simulation is undertaken in this paper to investigate the sound field distribution of linear and convex array in terms of various element dimensions, pitches, aperture lengths, and number of subdices. It is found that element and pitch sizes significantly affect the pattern of energy distribution. Because of the trade-off between the dimension of element and pitch, there are cross influences on main lobe, side lobes and grating lobes. It is also found that the energy distribution along the axial direction is affected by the dimension of the short axis. The energy will converge from the closer to the desired focus depth when the dimension of the short axis varies from narrow to a certain width. The energy no longer concentrates on a single point when the width is further increase. Subdicing is advantageous to reduce the energy intensity of side lobes. The more number of dices; the lower energy intensity of the side lobes will be. |
本系統中英文摘要資訊取自各篇刊載內容。