• 沒有找到結果。

五、 節線研究(Nodal Line)

5.3. 加干擾物的 Nodal line 波動行為探討

5.3.2 實驗結果討論

根據上述的資料所示,比對干擾物在不同距離下各個特徵態(K)的圖

形,其中特徵態(K)為17在各個距離皆出現相仿的圖形。因此以 Sinc function 為基底的數值方法可模擬出部分文獻所研究的二維方形及圓形的 Chladni pattern。

第六章 結論與未來展望

Sinc function 為具有正交性質的基底函數,其完備性並不完全,故其數

值解有些許的誤差,以二維方形圓形解析解與數值解的結果比較可以得 知;以 Sinc function 為基底的數值方法模擬,比較各個特徵態與解析解的特 徵態,在相同特徵態下的圖形是相當接近的;比對特徵能量值(Energy),

能量值相當的接近,方形及圓形數值解對解析解的誤差各約為 1.1% 及 2.39%,所以 Sinc function 依舊是為基底函數的最佳選擇之ㄧ。

而在 Chladni pattern 模擬,雖然所模擬的圖形及數量還無法與文獻完全 的類比,但已經顯示以 Sinc function 為基底的數值方法的確可以在給定特定 的邊界下,模擬出部分在相關文獻上所研究的 Chladni pattern。探討干擾物 對波動的 Nodal Line 圖形,我們亦可以針對干擾物在不同距離下,模擬出 與實際震砂實驗相似的圖形;而探討微擾對 Nodal Line 的影響,在有放置 干擾物下的特徵能量值,的確會高於無干擾物時的特徵能量值。

在此研究上並未針對 High Order 特徵態進行探討, High Order 特徵 態的圖形變化更為複雜,未來我們可以利用 Sinc function 為基底的數值方法 持續對在 High Order 特徵態作探討。另外我們可利用這個數值方法模擬干 擾物在任意邊界圖形中微擾的影響,尤其是當多個干擾物存在時,整個二 維系統會呈現出接近現實中無序的狀態,這在物理的研究上是相當重要的。

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