Weekly Exercises

Week 1

• Introduction to Engineering Design VI

• Google Site and GitHub Creation

  • https://github.com/sjokerkiller/CPE-322.git

Week 2

• Acquired Raspberry Pi #08 from Professor Kevin Lu

  • Charging Cable

  • SD Card (32GB)

  • Plastic Cover

  • Rubber Feet (x4)

Week 10: Synthesis

Synthesis in Engineering Design

• Requires creative thinking to combine ideas and things into new, meaningful, and practical forms

• Barriers to Synthesis include:

  • Knowledge

  • Perceptual

  • Emotional

  • Cultural

  • Expressive

Morphological Analysis

• A method developed by Fritz Zwicky for systematically structuring and investigating the total set of relationships contained in a multi-dimensional, non-quantifiable problems where causal modeling and simulation do not work

Week 11: Ethics and Product Liability

Ethics and Legal considerations in Design

• In general, engineers are legally and morally liable for the consequences of their work

• Unethical actions are often unintentional

• Ethic codes provide guidelines for us engineers

  • Professional registration

  • Federal, state, or local laws, regulations, and ordinances

  • Contract law

  • Tort (non-contract) law

Modern Engineering Codes of Ethics: Self-Regulation

• • National Society of Professional Engineers (NSPE)

  • Institute of Electrical and Electronics Engineers (IEEE)

IEEE Code of Ethics

• http://www.ieee.org/about/corporate/governance/p7-8.html

Week 12: Hazards Analysis and Failure Analysis

Three Levels of Failure

• Level Three

  • Errors in perspective or attitude

    1. EX: Overconfidence, impulsive behavior or decision-making, unethical or unprofessional behavior, lack of motivation

• Level Two

  • Errors in Process

    1. EX: Improper storage, errors in judgment, errors in calculation, errors in assembly, carelessness

• Level One

  • Physical flaws

    1. EX: Exposed moving parts, corrosion, electrical faults, etc.

Five Whys

• Developed by Sakichi Toyoda

  • Iterative interrogative technique used to explore the cause-and-effect relationships underlying a particular problem

  • Primary goal of the technique is to determine the root cause of a defect or problem by using the method of asking "Why?"

Types of Hazards

• Entrapment

  • Par of all of person's bod may be pinched or crushed

• Contact/Tactile

  • Hot surfaces, sharp edges, electrically charged elements

• Impact

  • Any striking of a device to a person

• Ejection

  • Any loose pieces strikes a person

• Entanglement

  • Clothing or hair become entangled in a device

• Noise and Vibration

  • Hearing loss, tactile sense, or fatigue

Hazard Exposure

• Reduced by:

  • Mechanisms to distance user from hazard

  • Increasing safety factor of the design

  • Quality Assurance Efforts

  • Design Redundancy

  • Warnings (least effective, should be used as a last resort with other approaches)

Week 13: Design Analysis

• Design evaluation can be performed using tools such as decision matrices and the Kepner-Tregoe analysis method

Revisit Morphological Chart done in Synthesis

Evaluating Alternative Designs

• Prioritize or weight the design goals against which each alternative will be evaluated

• Formulate a scheme by which ratings can be assigned to each proposed design concept

• Combine prioritized weightings with the rating established to generate a combined score for each alternative design

• Compare all total scores

• Carefully re-evaluate the best solution to determine if any remaining weaknesses in the design can be either reduced or eliminated

KT Decision and Evaluation Matrix Analysis

• Can help to:

  • Prioritize design goals

  • Rank design alternatives in terms of its ability to achieve the desired goals,

  • Determining the best solution for the problem

  • Identify the relative strengths and weaknesses of the best design

Week 14: Implementation

Design for Reliability

• Reliability is the probability that a device will satisfactorily perform a specific function for a specified period of time under given operating conditions

Design of Quality

• Quality is the total composite product and service characteristics of marketing, engineering, manufacture, and maintenance through which the product and service in use will meet the expectations of the customers

• Proactive quality assurance tools:

  1. FMEA (Failure mode and effects diagram)

  2. FTA (Fault tree analysis)

  3. Taguchi engineering method

Design for Packaging

• Provide aesthetic appeal and brand name recognition for the product

• Protect the product contents from spoilage or damage

• Prevent the misuses of the product

• Provide closures that are inexpensive to manufacture and easy to open

Design for Maintainability, Disassembly, and Recyclability

• Design for maintainability ensures a product will continue to operate properly with only a minimum amount of maintenance and repair

• Design for disassembly and design for recycle use. End of a product's operating life to select materials, fasteners, and sequential assembly operations that allow obsolete or deteriorated units to be safely and economically reused, recycled, or discarded