臺灣博碩士論文加值系統

本論文使用多重物理量耦合數值分析軟體COMSOL Multiphysics之有限元素法(Finite element method，FEM)分析，其主要目的在於研究分析橢圓形截面直通式消音器內部放置開口擋板、延伸管、沖孔管和貼附吸音材料之尺寸設計及汽車排氣消音器分析與改良設計。
本論文主要分為二部分：(1) 探討汽車排氣消音器的消音性能，分析消音器的內部構造，如延伸管的長度、延伸管的半徑、膨脹室的長度、膨脹室的寬度，並且對消音器性能的影響。(2) 整合類神經網路與遺傳演算法之最佳化方法，設計機車排氣消音器內部延伸管長度之最佳化設計。
本論文之消音器設計，是使用COMSOL模擬分析與結合類神經網路及遺傳演算法之最佳化設計，藉此提升消音性能，並且提升產品競爭力。

COMSOL, a multiple physical quantities coupled numerical analysis software, is adopted in the acoustical analysis in the thesis. The primary purpose of the research is to analyze and design the ellipse straight-through muffler by adding baffles, extended tube, perforated tube and sound muffling material inside the motorcycle exhausting muffler.
The thesis includes two parts: (1)An assessment of the acoustical performance for the automobile exhausting muffler. Here, the acoustical effect of the internal extended tube and the placement of internal baffles will be discussed. (2)A best allocation of the automobile exhaust muffler with an interior extended tube will be explored by using the artificial neural network in conjunction with the GA optimizer.
Consequently, the motorcycle exhaust muffler is designed and improved using the COMSOL and the optimal process. With this analysis, the muffler’s competition in market will be greatly promoted.

致謝 I
摘要 II
Abstract III
目錄 IV
圖目錄 VI
表目錄 VIII
第一章 緒論 1
1.1 前言 1
1.2 文獻回顧 1
1.3 研究動機 4
第二章 理論基礎 5
2.1 消音器 5
2.2 排氣消音器 5
2.3 類神經網路系統 6
2.3.1 多項式類神經網路的概念 6
2.3.2 多項式類神經網路之建構 8
2.4 遺傳演算法 10
2.4.1 遺傳演算法流程 11
2.5 多重物理量耦合分析 12
2.5.1 有限元素法 12
2.5.2 平面波 12
2.5.3 COMSOL 建模流程 14
第三章 消音器性能驗證 15
3.1 消音器模擬驗證 15
3.2 分析設定 15
3.3 矩形截面出入口中心內置開口擋板直通式消音器 19
3.4 圓形截面出入口延伸管式消音器 21
3.5 單邊沖孔延伸型消音器 23
3.6 雙邊沖孔延伸型消音器 25
第四章 消音器內置多個開口擋板及內部延伸管之消音性能 27
4.1 消音器內部放置多個擋板及內部延伸管之消音性能 27
4.2 消音器內放置多個擋板及不同延伸管直徑之消音性能 30
4.3 消音器內置多個開口擋板及不同長度延伸管之消音性能 32
4.4 消音器內部沖孔改變之消音性能 34
4.5 消音器膨脹室長度變化之消音性能 36
4.6 消音器膨脹室直徑變化之消音性能 38
4.7 消音器內部貼附不同吸音材料之消音性能 40
第五章 汽車消音器之消音性能分析與改良 42
5.1 汽車消音器之消音性能 42
5.2 汽車消音器第一腔不同出口延伸管長度之消音性能 46
5.3 汽車消音器第三腔不同出口延伸管長度之消音性能 48
5.4 汽車消音器第三腔不同出口延伸管管徑變化之消音性能 50
5.5 汽車消音器改變膨脹室長度之消音性能 52
5.6 汽車消音器改變膨脹室直徑之消音性能 54
第六章 汽車排氣消音器尺寸最佳化 56
6.1 進出口延伸管置於汽車消音器內改變第二與第三腔出口延伸管之兩變數最佳化 58
6.2 進口延伸管置於汽車消音器內改變第一腔與第三腔進口延伸管長度之兩變數最佳化 64
第七章 結論 70
參考文獻 73
附錄一 76
附錄二 78
附錄三 80
附錄四 82

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