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Design Concerns

Design Concerns. IN DEVELOPING DESIGN CONCERNS THE FOLLOWING PRODUCT ATTRIBUTES/FEATURES SHOULD BE CONSIDERED. Physical Structural Environmental Human engineering Life cycle Cost. PHYSICAL. Configuration/size

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Design Concerns

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  1. Design Concerns

  2. IN DEVELOPING DESIGN CONCERNS THE FOLLOWING PRODUCT ATTRIBUTES/FEATURES SHOULD BE CONSIDERED • Physical • Structural • Environmental • Human engineering • Life cycle • Cost

  3. PHYSICAL • Configuration/size • Dimensions (can bound if unable to define exactly - not less than/not greater than) • Tolerances • Surface finishes • Weight • Mass properties • Center of gravity • Moments of inertia

  4. STRUCTURAL • Need to consider piece parts and assemblies (joining mechanisms) • Strength • Stiffness • Impact • Durability (fatigue)

  5. ENVIRONMENTAL • In-service conditions • Temperature, humidity, UV exposure, chemical exposure

  6. HUMAN ENGINEERING • Safety • Ergonomics • Aesthetics

  7. LIFE CYCLE • "Cradle-to-grave“ • Sustainability, “Green” • Maintenance, repairability • Renewable materials • Disposal (recyclable, biodegradable, hazardous materials) • Warranty

  8. COST • Cost (materials, manufacturing process - labor, tooling, equipment usage) • Additional considerations • Price (look at competing products to gain insight) • Profit

  9. ASSUME THE NEED IS A COMMUTER BICYCLE • Translating customer input into quantifiable design concerns • Physical - lightweight • Structural - adequate strength • Environmental - will not degrade when exposed to water • Human engineering - accessibility to controls • Life cycle - easy to service • Cost - affordable price

  10. DETERMINING ASSESSMENT MEASURES FOR EACH DESIGN CONCERN • Definition: what will be measured to determine how the design performs with respect to the specific design concern (note units) • Requirement: if the design concern is a requirement, what is the level (value) of the assessment measure which has to be achieved in order to comply with the requirement (for a design concept to be considered a possible solution) • Goal: if the design concern is a goal, what is the desired direction of the assessment measure in order to come closer to achieving the goal (the design concept which performs most favorably with respect to the goals is the best solution) • For the bicycle example

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