第七讲 模煳综合评价法

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二.模糊综合评价方法简介•综合评价:由于同一事物具有多种属性,或受多种因素的影响,在评价事物时,应兼顾各个方面,对各个影响因素作综合考虑。•综合评价法:总分法,加权平均法,模糊综合评价法。•总分法:•加权平均法:niiSS1niiiSwS11.模糊综合评价的步骤和方法1)确立影响因素的因素集nuuuU,,,212)确立n种因素的权重集UFaaaAn,,,213)确立m种判断的评价集VFvvvVm,,,21niia114)确立单因素的判断VFrrrufuimiiii,,,~21nmnnmmrrrrrrrrrR211222111211VFUf:~5)计算综合判断BVFbbbRABm,,,21nmnnmmnmrrrrrrrrraaabbb2112221112112121,,,,,,mirabijinii,,2,1,16)再将B规一化mibbbmiijj,,2,11mbbbB,,,21•利用模糊综合评价法评定顾客对某种衣服的欢迎程度。解题步骤:1)建立属性集(因素集):A={花色,样式,价格,耐用度,舒适度}例12)建立权重集(选定某类男顾客)W={0.1,0.1,0.15,0.3,0.35}niiw11W:权重模糊向量3)建立备择集(评价集)V={很欢迎,欢迎,一般,不欢迎}4)列出单因素模糊评价花色:R1=(0.2,0.5,0.3,0);样式:R2=(0.1,0.3,0.5,0.1);价格:R3=(0,0.1,0.6,0.3);耐用度:R4=(0,0.4,0.5,0.1);舒适度:R5=(0.5,0.3,0.2,0)。5)建立单因素评价矩阵R=[R1,R2,R3,R4]02.03.05.01.05.04.003.06.01.001.05.03.01.003.05.02.0ijrR6)进行模糊综合评价ijnjjjrwrwrwb2211mbbbRWB,,,21∧:表示两个变量取小的;∨:表示两个变量取大的。5.035.003.0015.01.01.02.01.01b02.03.05.01.05.04.003.06.01.001.05.03.01.003.05.02.035.0,3.0,15.0,1.0,1.0RWB35.035.0001.01.030.02b30.03b15.04bB=(0.35,0.30,0.30,0.15)7)B归一化由于b1+b2+b3+b4=1.1要对B归一化。B=(0.32,0.27,0.27,0.14)例2•某构件的安全系数k应在1.5~3.0之间,与构件相关的有:设计水平,制造水平,构件材料,构件重要度,假设这四种因素的影响度分别为0.26,0.20,0.24,0.30。试分析此构件的安全系数。解题步骤1)建立属性集A={设计水平,制造水平,材质好坏,构件重要度}2)建立权重集W=(0.26,0.20,0.24,0.30)3)建立备择集K={1.5,1.8,2.1,2.4,2.7,3.0}4)单因素评价0.19.06.04.01.0001.02.08.00.15.005.00.18.05.0001.02.08.00.15.0R5)模糊综合评价RWB28.272.1918.36161iiiiibkbkB=(0.26,0.26,0.30,0.30,0.30,0.30)6)安全系数的具体确定课堂练习•对某种理论,用模糊综合评价方法来评价。已知:因素集A={稳定性,准确性,快速性};权重集W=(0.2,0.5,0.3);评价集V={很好,比较好,不太好,不好};单因素评价稳定性R1=(0.2,0.7,0,1.0);准确性R2=(0,0.4,0.5,0.1);快速性R3=(0.2,0.3,0.4,0.1)。作业•对某产品质量作综合评判,考虑从四种因素来评价产品,U={u1,u2,u3,u4},将产品质量分为四等V={Ⅰ,Ⅱ,Ⅲ,Ⅳ},设单因素评判矩阵如右,且设有两种因素权重分配A1=(0.5,0.2,0.2,0.1),A2=(0.2,0.4,0.1,0.3)试评价此产品按两种分配情况下,分别相对地属于哪级产品。4.02.03.01.01.01.03.05.03.05.02.0001.06.03.0R综合练习•对生产的棉条,评判指标有五项,u1为伸直度,u2为分离度,u3为条干均匀度,u4为重量均匀率,u5为结杂粒数;评判结果为三等:v1为优,v2为中,v3为劣;权重集A=(0.23,0.25,0.15,0.15,0.22);各因素对于各等级的隶属函数如下:6360066636331706611111111uuuuuf63606031666317066704111111112uuuuuuf6360166636631706601111113uuuuuf4341048434351544812222221uuuuuf43414121484315448546122222222uuuuuuf4341148434851544802222223uuuuuf141201210122110913333331uuuuuf1412142112101109933333332uuuuuuf141211210102110903333333uuuuuf8.45.305.31.35.3251.39.214444441uuuuuf8.45.38.413105.31.311.39.29.2544444442uuuuuuf8.45.315.31.31.3251.39.202444443uuuuuf6555055505551504515555551uuuuuf655565101555015045455155555552uuuuuuf6555155505051504505555553uuuuuf某梳棉机生产的质量数据为:u1=64.8,u2=50,u3=11.2,u4=3.6,u5=52.4。求:该机生产的棉条质量如何?

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