MBD Chapter 6-10

MBD Chapter 6-10 - Human Resources Mat er ial Resources...

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Unformatted text preview: Human Resources Mat er ial Resources Production System Exper ience 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 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 (2) Ecology (3) Quality of Life Miscellaneous Considerat ions → (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 t ime: 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. Methodology for Solving Machine Component Problems Statics and Dynamics...
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This note was uploaded on 03/02/2010 for the course MECH 530 taught by Professor Ramesh during the Spring '10 term at Johns Hopkins.

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MBD Chapter 6-10 - Human Resources Mat er ial Resources...

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