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Unformatted text preview: Objective function a function of equation used to define an object Strength vs. stiffness/deflection (rubber> not stiff but strong, steel> strong and stiff) Strength- the material, and how it breaks, stress measures pressure the material feels Stiffness- how resistance the material is as to deflection Deflection- compresses, how much it streches Objectives: Mass, most likely want a light ladder for easy use and manoeuvrability Cost, smallest cost possible Constraints: doesnt break ** making it stiffer decreases the strength, making it stronger decreases stiffness M = pbhl H is stiffness H = ( (pl^2)/4EbCf)^1/3 Criteria for Success Budget Team Design briefs Technical decisions...
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- Fall '10