Download e-book for kindle: The Design Method by S. A. Gregory (auth.), S. A. Gregory B.Sc., C.Eng.,


By S. A. Gregory (auth.), S. A. Gregory B.Sc., C.Eng., M.I.Chem.E. (eds.)

ISBN-10: 1489961690

ISBN-13: 9781489961693

ISBN-10: 1489963316

ISBN-13: 9781489963314

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The solution with the highest rating may look the most promising, but the next one or two should not be ignored. 1 General purpose domestic suction clesning machine Factor Solution A Hand-held unit Solution B Cyllnder with paper dust-bag I Solution C Globe model with cyclone Solution D 'Slipper' model with handle Weight Grade GxW Grade GxW Grade GxW Grade GxW 10 3 30 4 40 4 40 5 so Emptying 8 2 16 4 32 3 24 3 24 Handling (movement) 5 5 25 5 25 4 20 4 20 Storage slze 4 5 20 4 16 3 12 4 16 Versatillty 5 1 5 5 25 4 20 4 20 Suction power 4 2 8 4 16 5 20 5 20 Partide slze range 1 2 2 4 4 4 4 4 Fitting accessories 2 2 4 5 10 5 10 4 8 Handling (accessories) 8 1 8 5 40 5 40 4 36 Appearence 2 3 6 4 8 4 8 3 6 Handling (fioor) Sum 245 max.

6). If the category in the horizontal line is considered more contains a suggestion for the solution of a sub-problern (a partial solution) should start a new category. The primary needs of the sponsor (if these are not solved, the fulfilment of other needs is pointless) should, of course, suggest the first category, or categories. Sponsor•s problern No Factor content 1 Easy to move around General purpose domestic I! arge b•ts X X ? 5. 1 Power drive Dust extract•on 111 IV Aceesseries V Human VI VII Aesthelic VIII Tube extension Sum X Factor classification chart I u ~ X X • X III I~ i X ~ i X V VI \' X X X X I X i ~ X i X I X !

VII more important than IV). 3. 7). 7. Interactionmatrix between two categories should be questioned (another use for the work study routine), and the results noted. This process can re·veal further factors that were overlooked in previous steps, especially if the lists of factors in each category are studied carefully. 8 (each line denotes an interaction). Weak interactions between groups of categories may suggest splitting the problern into two or more parts. 8. Interaction nets The interactions noted above must now be transformed into performance specifications, at least one such p-spec for each interaction.

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The Design Method by S. A. Gregory (auth.), S. A. Gregory B.Sc., C.Eng., M.I.Chem.E. (eds.)

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