# lecture 8 - Objective function – a function of equation...

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Where does math and science come from? Intro: Design a ladder rung Need to know how the math and science is applied in the design. Before the design process begins you have to figure out if it’s really needed. If not, then there is no reason to even begin designing. Innovative ladders There is a need for the ladder Inputs – has design tasks, what must be preformed Conceptual Design Generate concepts and schemes of design Preliminary design Model and analyze chosen design Test and evaluate chosen design Detail design Refine and optimize chosen design Assign and fix design details Basic definitions Design variables: h (height if the rung> gravity potential) Constraints- limitations of restrictions eg. breaking Objectives - aspect of design to improve eg. Cost effective, mass, compact

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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: doesn’t 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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lecture 8 - Objective function – a function of equation...

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