Design concerns
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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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Design concerns

Design Concerns


In developing design concerns the following product attributes features should be considered

IN DEVELOPING DESIGN CONCERNS THE FOLLOWING PRODUCT ATTRIBUTES/FEATURES SHOULD BE CONSIDERED

  • Physical

  • Structural

  • Environmental

  • Human engineering

  • Life cycle

  • Cost


Physical

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


Structural

STRUCTURAL

  • Need to consider piece parts and assemblies (joining mechanisms)

  • Strength

  • Stiffness

  • Impact

  • Durability (fatigue)


Environmental

ENVIRONMENTAL

  • In-service conditions

  • Temperature, humidity, UV exposure, chemical exposure


Human engineering

HUMAN ENGINEERING

  • Safety

  • Ergonomics

  • Aesthetics


Life cycle

LIFE CYCLE

  • "Cradle-to-grave“

  • Sustainability, “Green”

    • Maintenance, repairability

    • Renewable materials

    • Disposal (recyclable, biodegradable, hazardous materials)

  • Warranty


Design concerns

COST

  • Cost (materials, manufacturing process - labor, tooling, equipment usage)

  • Additional considerations

    • Price (look at competing products to gain insight)

    • Profit


Assume the need is a commuter bicycle

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


Determining assessment measures for each design concern

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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