MOTOROLA MVME2603-3121 SCANBE MPC603 200MHZ 256KB CACHE CPU W/16MB PCI MEZZ SLOT隸屬度函數可以選取多種形式,視具體指標性質而定。根據本研究的指標情況,取隸屬度函數為線性函數形式之間。2.2.2層次權重定的群組AHP法AHP應用于機械系統總體性能的評價,個很關鍵的問題就是要計算各評價指標相總體性能的指標權重,就是各評價指標總體性能優劣影響程度進行量化。指標權重值是通過在單則下構造兩兩比較判斷矩陣而得到。
所有專給出的判斷矩陣進行性檢驗,剔除那些不滿足性檢驗的矩陣。設有A2,…,Am共m個矩陣通過性檢驗,各矩陣的權向量:(wlk,W2k,…,Wimk)T,k=l,2,…,m在可能的情況下再m個專的可依賴程度填寫判斷矩陣A設其大特征值Xmax所應的歸化特并進行組合性檢驗。若能通過組合性檢驗,即可。╓ 2,…,Wim)T作為排序權向量。層次總排序層次總排序就是要定低層指標總目標的權重,以找到佳方案。

令設因素層各因素Bi(i=,2…,9)目標層A的權重為w=(wi,W2,…W9);是個25X9的矩陣是指標層各因素的單排序權重,則:W=W0°W必為25位列向量,且是歸的。
記W=(W,W2,…,W25)T,則Wi就是指標層中各指標目標的權重。由W即完成了層次總排序。
指標權重定后,在指標價值量化的基礎上,就可以進行方案總體性能的綜合評價。評價的主要目的是定方案的優劣,并給出優劣程度的定量描述。進行綜合評價的方法比較多,如建立總體評價函數的方法、模糊綜合方法等。
采用總體性能評價函數的方法進行綜合評價,關鍵在于總體性能評價函數的建立。線性加權和函數法“的基本思想是強調系統的總體效果而不偏激,比較適用于機械總體性能的評價。
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