MBD Chapter 6-10 - H uman Resour ces M at er ial Resour ces...

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Human Resources Material Resources Production System Experience Products Waste a T b Chapter 1: Mechanical Engineering Design in Broad Perspective 1. Overview Two main areas of concern: (1) Stress-strain bulk of solid member (2) Surface phenomena friction, lubrication, wear & tear, environmental deterioration 2. Safety Main Points: Awareness, Ingenuity 2.1.Imagination & Ingenuity Anticipate potential problems Fool-proof (just because people with common sense wouldn’t do it, doesn’t mean it won’t happen) 2.2. Techniques & Guidelines Review total life cycle Balanced approach Safety = integral feature “Fail-safe” design (when at all possible) Standards (Government, Industrial) Warnings 2.3. Documentation All tests & results Performance data 2.4. Non-technical Aspects (1) Capabilities and Characteristics (2) Communication (3) Cooperation 3. Ecological Considerations Main objectives of Mechanical Engineers (1) Utilize materials that are economically recyclable (2) Minimize rate of consumption of non-recycled energy Points to be considered: (1) Basic design objective is sound (2) Review overall concepts in proposed design (3) Design for recycling (4) Materials selection with ecological factors in mind (5) Processing options (6) Packaging considerations 4. Societal Considerations
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LQI = Life Quality Index (1) Physical Health (2) Material Well-Being (3) Safety (crime and accident rates) (4) Environment (Air, water, land, natural resource management) (5) Cultural Education (literacy rate, school quality, etc.) (6) Treatment of disadvantaged groups (7) Equality of opportunity (8) Personal freedom (9) Population Control Maslow’s Hierarchy of Needs (1) Survival (2) Security (3) Social Acceptance (4) Status (5) Self-fulfillment 5. Overall Design Considerations → Traditional Considerations (1) Materials (2) Geometry (3) Operating Conditions (4) Cost (5) Availability (6) Producibility (7) Component Life → Modern Considerations (1) Safety
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(2) Ecology (3) Quality of Life Miscellaneous Considerations (1) Reliability & Maintainability (2) Ergonomics & Aesthetics 6. System of Units Units of Force: pound force, pound, Newton Units of Mass: pound mass, slug, kilogram Units of Length: inches, feet, miles, centimeters, meters, kilometers Units of time: seconds, minutes, hours English Engineering: F = m a / g c g c = 32.2 ( ft (lbm) / lb s^2 ) British Gravitational F = m a slug = 1 ( 1b s^2 / ft ) 1 lbm = 1 / 32.2 slug SI (Système International d’Unités) F = m a Newton = kgm/s 7.
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