臺灣博碩士論文加值系統

本研究是討論具多重功能特徵之產品的容差最佳分配。為了使產品設計能符合穩健化的要求，合理容差分配是在產品的製造成本與品質損失之間取得適當的平衡。當設計的產品具有一個以上的功能特徵時，產品的品質損失，必須考量個別特徵偏離設計值時的加成影響。針對品質特徵之不確定性為相關的產品，本研究是經由變異數與共變異數矩陣的估算來推產品之損失。此外在分析產品特徵之正、負偏差量對產品品質有不同的影響力時，本研究是以二段非對稱的二次函數來描述個別的損失。而產品所有的損失則是以分區連續的方式，在不同的範圍內使用不同係數之損失函數來估算。最後本文以螺旋彈簧之設計為例說明建議的容差設計法則。

This paper presents an optimum tolerance assignment method for the products with multiple functional characteristics. In order to approach robust product design, the assignment of dimensional tolerances should take both manufacture cost and quality loss into account. As products having more than one functional characteristic, individual properties will contribute different quality losses when characteristic parameters deviate from their design targets. For the product that the uncertainties of characteristics are correlated, it is recommended that the total quality losses be evaluated through the calculation of the variance-covariance matrix. In the case that the positive and negative deviations of product characteristics cause different effects, two asymmetric quadric segments are employed to describe the corresponded loss function. In this work, possible combinations of the characteristic parameters were classified into separated zones and the total quality loss is estimated based the average of the losses at different zones. Finally, the assignment of dimensional tolerances of a spiral spring is given to explain the proposed tolerance design method.

第一章 緒 論1
1.1前 言1
1.2文獻回顧2
1.3本文架構5
第二章 品質損失6
2.1損失函數6
2.2平均品質損失之估算9
2.2.1均勻機率分佈13
2.2.2常態機率分佈14
2.2.3其它機率分佈18
第三章 相關尺寸之品質損失19
3.1多重特徵產品之損失估算19
3.2相關特徵之品質損失23
3.3尺寸容差與品質損失26
第四章 非對稱品質損失函數31
4.1損失函數中係數之估算31
4.2分區計算品質損失36
第五章 最佳化容差設計40
5.1最佳化模組40
5.1.1設計變數與限制條件40
5.1.2目標函數的制定42
5.2應用實例44
第六章 結 論50

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