臺灣博碩士論文加值系統

本文以共軛梯度法與變尺度法為基礎發展出一個方法，其可用來估算動圈式揚聲器中重要但難以量測的非線性電域參數。藉由揚聲器電流及音圈位移訊息之量測，可透過正解問題、伴隨方程式問題及靈敏度問題等三個計算程序，同時反算出未知的磁力轉換因子 及音圈電感 這兩個非線性電域參數與揚聲器振膜質量 、非線性阻尼係數 及振膜懸吊系統剛性係數 這三個難以量測的機械域參數。經由數值模擬之驗證，顯示本文所提出之電聲逆運算理論具有計算時間短、迭代次數少、準確性高之特性。並發現係數比例調整之加入確實可有效改善預測結果的穩定性。此外本方法透過簡易之電聲量測及數值計算，即使在具有量測誤差的情況下，依然可獲得良好之結果，顯示本文所提出之電聲逆運算理論可有效減低量測誤差所造成之影響。

This paper develops a method for estimating the important and hardly measured nonlinear electroacoustic parameters in moving-coil loudspeaker based on conjugate gradient method and variable-metric method. By measuring the information of loudspeaker displacement and current, three hardly measured mechanical domain parameters, including loudspeaker diaphragm mass , nonlinear damping coefficient and diaphragm suspension system stiffness coefficient and the two electrical domain parameters, unknown force factor and voice coil inductance and diaphragm suspension system stiffness coefficient can be calculated inversely through direct problem, adjoint equation problem and sensitivity problem calculation procedures. According to the validation of numerical simulation, the addition of coefficient scale adjustment actually improves the stability of prediction result effectively. In addition, based on simple electroacoustic measurement and numerical calculation, even if there is measurement error, this method can obtain good result, meaning the inverse electroacoustic theory proposed in this paper can reduce the effect of measurement error effectively.

目錄
誌謝 i
摘要 ii
Abstract iii
目錄 iv
圖目錄 vi
表目錄 viii
符號表 ix
第一章 緒論 1
1-1前言 1
1-2研究動機 1
1-3文獻回顧 2
1-4論文架構 4
第二章 電聲參數量測方法 6
2-1附加質量法(Added mass method) 8
2-2附加順性法(Added compliance method) 12
2-3 Klippel量測系統 15
第三章 反算理論與優化技巧 21
3-1反算理論 21
3-2優化技巧 22
第四章 電域參數之反算 30
4-1集中參數模型 30
4-2電流量測逆運算法 31
4-3參數比例調整 38
4-4計算方法與步驟 39
4-5結果與討論 40
第五章 機械域參數之反算 52
5-1動圈式揚聲器的模型架構 52
5-2目標函數之定義與變尺度法之搜尋方向 53
5-3計算方法與步驟 61
5-4結果與討論 62
第六章 結論與未來展望 73
6-1結論 73
6-1未來展望 74
參考文獻 75

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