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Criteriul Ni<br />

Ni<br />

Ni<br />

Ni<br />

1 3 9 7 2<br />

2 2 10 10 4<br />

3 7 7 5 9<br />

4 8 6 6 10<br />

5 8 5 4 9<br />

6 5 8 9 3<br />

7 6 7 7 4<br />

8 5 8 8 3<br />

9 7 7 10 5<br />

10 8 9 3 6<br />

4.5. Cal<strong>cu</strong>larea produselor dintre notele N (i<br />

coeficienii <strong>de</strong> pon<strong>de</strong>re<br />

Acest cal<strong>cu</strong>l se efectueaz într-un tabel <strong>de</strong>numit<br />

matricea consecinelor (tabelul 3).<br />

În final se cal<strong>cu</strong>leaz i sumele acestor produse;<br />

sumele (valori <strong>de</strong> obicei unice, asociate fiecrei<br />

variante) vor stabili clasamentul final. Pe primul loc<br />

se va situa varianta având valoarea sumei cea mai<br />

mare. Dac valorile sumelor rezult apropiate,<br />

înseamn c variantele respective asigur<br />

performane apropiate.<br />

Tabelul 3<br />

A B C D<br />

N N N × <br />

Crt. Ni<br />

× i i × i i × i i i<br />

1 1,14 3,42 2,66 0,76<br />

2 2,64 13,2 13,2 5,28<br />

3 27,44 27,44 19,6 35,28<br />

4 25,2 18,9 18,9 31,5<br />

5 25,2 15,75 12,6 28,35<br />

6 6,6 10,56 11,88 3,96<br />

7 4,08 4,76 4,76 2,72<br />

8 3,4 5,44 5,44 2,04<br />

9 0,84 0,84 1,2 0,6<br />

10 42,4 47,7 15,9 31,8<br />

Clasament<br />

final<br />

138,94 148,01 106,14 142,29<br />

5. Concluzii<br />

În urma <strong>analizei</strong> <strong>multi</strong>-<strong>criteriale</strong> realizate se<br />

constat c suma cea mai mare (148,01) plaseaz<br />

varianta B – dispozitivul gravitaional controlat<br />

va<strong>cu</strong>umatic – pe primul loc, iar pe lo<strong>cu</strong>l al doilea<br />

varianta D – dispozitiv gravitaional ghidat <strong>de</strong> role i<br />

suspendat <strong>de</strong> un fir prin intermediul unui scripete<br />

(142,29).<br />

Bibliografie<br />

1. Stone, J. M., Un<strong>de</strong>rwood, A. F. Load-<br />

Carrying Capacity of Journal Bearings, SAE<br />

Quarterly Transactions, January, 1974.<br />

2. Moore, D. F. A Review of Squeeze Films,<br />

Wear, Vol. 8, 1965, pp. 245-263.<br />

3. Moore, F. D. Principles and Applications of<br />

Tribology, Pergamon Press Ltd., Oxford<br />

(1998).<br />

4. Cioc, V., Boban<strong>cu</strong>, N., Cozma, R. Global<br />

Diagnostic of Liquid Lubricants by Means of<br />

Extruding the Lubricant Film (Squeeze Film),<br />

In Bul. SISOM ’99, Bucharest, November,<br />

25-26, pp. 351-354.<br />

5. Cioc, V., Boban<strong>cu</strong>, N., Cozma, R.:<br />

Performan2ele unui aparat pentru<br />

<strong>de</strong>clan!area fr !oc a fenomenului <strong>de</strong><br />

squeeze film. În Buletinul AGIR 1999.<br />

6. Boban<strong>cu</strong>, N., Cozma, R., Cioc, V. Tribologie.<br />

Inventic. Îndrumar prntru lucrri <strong>de</strong><br />

laborator, Universitatea Transilvania, Braov,<br />

2000.<br />

7. Marui, E. et al. On The Squeeze Effect of<br />

Lubricant Between Two Rough Surfaces,<br />

Journal of Tribology, October 1987, Vol. 109,<br />

pp. 696-703.<br />

8. Boban<strong>cu</strong>, N., Cozma, R., Lixndroiu, D.,<br />

Foioreanu, V. Tehnici <strong>de</strong> Creativitate, Ed.<br />

Lux Libris, Braov, 1998.<br />

9. Boban<strong>cu</strong>, N., Cioc, V. Inovare inginereasc în<br />

<strong>de</strong>sign, Universitatea Transilvania, Braov,<br />

2002.

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