Definition design Realization of a concept or idea into a configuration, drawing, model, mould, pattern, plan or specification (on which the actual or.

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Presentation transcript:

Definition design Realization of a concept or idea into a configuration, drawing, model, mould, pattern, plan or specification (on which the actual or commercial production of an item is based) and which helps achieve the item's designated objective ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

The Engineering Design Process Creative process Problem solving – the big picture No single "correct" solution Technical aspects only small part ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Elements of Design the Process Problem Identification Research Phase Requirements Specification Concept Generation Design Phase Prototyping Phase System Integration Maintenance Phase ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Cost of Design Changes Costs increase exponentially as the project lifetime increases ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Problem Identification and Requirements Specification ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Needs Identification What is the Problem? Collect information Interpret information Organize needs hierarchy Determine relative importance of needs Review outcomes and process ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Example Needs Hierarchy ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Problem Statement Example 2.1 Need: Drivers have difficulty seeing obstructions in all directions Objective: design system to avoid accidents ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Requirements Specification Identifies requirements design must satisfy for success Marketing requirements Customer needs Engineering requirements Applies to technical aspects Performance requirements ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Properties of Engineering Requirements Abstract – what, not how Unambiguous – unique and specific Unlike marketing requirements Traceable – satisfy need? Verifiable – test/measure ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Example Engineering Requirements Performance and Functionality Will identify skin lesions with a 90% accuracy Should be able to measure within 1mm Reliability Operational 99.9% of the time MTBF of 10 years Energy Average power consumption of 2 watts Peak current draw of 1 amp ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Properties of Requirements Specification Normalized (orthogonal) set Complete set Consistent Bounded Granular – system vs. component Modifiable From IEEE Std. 1233-1998 ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Constraints Economic Environmental Ethical and Legal Health and Safety Manufacturability Political and Social – FDA, language? Sustainability ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Standards Examples – RS-232, TCP/IP, USB Types Safety Testing Reliability Communications Documentation Programming Languages ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Concept Generation and Evaluation Explore many solutions Brainstorm Select the best solution Based on needs and constraints Creativity Development of new ideas Innovation Bringing creative ideas to reality ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Creativity ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Barriers to Creativity Perceptual blocks Limiting problem space Emotional blocks Fear of failure – “fail early and often” Environmental blocks Engineering cultural bias Intellectual and expressive blocks Understand tools ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Strategies to Enhance Creativity Lateral thinking Question Practice Suspend judgment Allow time Think like a beginner ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Concept Generation Substitute – new elements Combine – existing elements Adapt – different operation Modify – size, shape, function Put to other use – other app domains Eliminate – parts or whole Rearrange or reverse – work better ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Concept Table ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Concept Evaluation ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Design Considerations WORST CASE DESIGN Component variation Environmental conditions Use computer simulations ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Design Considerations 2) RELIABILITY measured by MTBF, failure rate = 1/MTBF mechanical parts fail first design redundancy into system simple system/fewer parts = more reliable ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Design Considerations 3) SAFETY identify failure modes provide protection 4) TEST design for ease of test 5) PRODUCTION/MANUFACTURING consider ease of assembly ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Design Methodologies: Top-Down Also called “functional decompostion“ implementation details considered only at the lowest level top‑down design, is not so clean and linear in practice Often implementation‑level commitments are made at high levels in the design process ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Design Methodologies CASE‑BASED: INCREMENTAL REDESIGN: Research a specific, similar design case study Model your process on that INCREMENTAL REDESIGN: Find an existing design and "unravel" the design from the bottom up Modify as required Detailed and least global aspects of the design are explored and redesigned, if necessary, first ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Design Methodologies ITERATIVE REFINEMENT: An iterative top‑down approach First a rough, approximate and general design is completed Then we do it finer, more exact and more specific This process continues iteratively until the complete detail design in done ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Design Methodologies BOTTOM‑UP DESIGN: Opposite of top‑down Start at the bottom with detail design To do this, you must have some idea of where you are going. So, often this becomes... HYBRID DESIGN: Combines aspects of both top‑down and bottom‑up More practical design approach then pure top‑down Start with a top‑down approach, but have feedback from the bottom ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Design Methodologies "EXPLORER" METHOD: Typically used for new design ideas or research. It is useful in initial design and specification stages, and is often used when in "unfamiliar territory": Move in some direction; e.g. toward the library, telephone, domain expert's office, etc. Look at what you find there. Record what you find in your notebook. Analyze findings in terms of where you want to be. Use results of analysis to choose next direction. Back to 1) and continue exploring ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Top-Down Application: Digital Design SIMPLE DIGITAL STOPWATCH Engineering requirements No more than two control buttons Implement Run, Stop and Reset Output a 16-bit binary number for seconds ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Top-Down Design: Level 0 ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Top-down Design: Level 1 ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Top-down Design: Level 1 (cont’) ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Top-down Design: Level 1 (cont’) ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Design Group (Team) Engineering projects require diverse skills This creates a need for group (team) work Select members based on skills Technical Problem-solving Interpersonal ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Design Group (Team) Develop decision making guidelines Decision by authority (leader) Expert Member Average member opinion Majority Consensus ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Design Group (Team) Teams that spend time together tend to be successful teams Respect each other Listen actively Consider your response to others Constructively criticize ideas, not people Respect those not present Communicate your ideas effectively Manage conflict constructively ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Design Group (Team) Hold effective meetings Have an agenda Show up prepared Pay attention Schedule time and place of next meeting Summarize Assign tasks and responsibilities ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Project Management Work breakdown structure Activity Hierarchical breakdown of tasks and deliverables need to complete project Activity Task – action to accomplish job Deliverable – e.g. circuit or report ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Project Management Define for each activity Work to be done Timeframe Resources needed Responsible person(s) Previous dependent activities Checkpoints/deliverables for monitoring progress ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Schedule – Gantt Chart ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Project Management Guidelines Project plan after design plan complete Double time estimates and add 10% Assign a lot of integration and test time Remember lead times for parts ordering Assign tasks based on skills and interests Track progress versus plan Plans change ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Project Communication Focus on needs of specific audience  Who?  level of knowledge their motivation – needs  Why?  to persuade  to inform ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Project Proposal One goal is to sell idea, be persuasive In industry the proposal will show: Product is useful for someone for something The design will work, it will solve the problem Will meet the specified constraints Additionally, in Senior Design, the proposal should show: You are learning something new Sufficiently complex Apply previously learned ECE knowledge ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Project Proposal Format Second goal is to inform 1) Title page - project title, names, date, 404 lecture section number, group number. 2) Table of Contents, with page numbers. 3) Introduction 4) Problem Analysis 5) Requirements Specification 6) Preliminary Design. Include a block diagram - the more detailed the better. Will help with the scheduling and task assignment 7) Preliminary Schedule (see Figure 10.3, Gantt chart) 8) Conclusion – summarize why this will be a great senior project. 9) References – any references used in proposal development ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Oral Presentations Structure Intro: Tell them what you will tell them Introduce group and project Overview and background Body: Tell them Use top-down approach Support main points Conclusion: Tell them what you told them Summarize and emphasize main points ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Oral Presentations Tips Prepare – practice, practice, practice Eye contact with entire audience Avoid too much information Meet time constraints Look and act professionally Use visuals effectively ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

Oral Presentations Slides Use a large font, 24 pt or more Avoid more than 4 or 5 bullets per page Avoid fancy graphics that add no value Group slides for major points (top-down) Avoid reading slides ECE 404 Scott Umbaugh, Textbook: Design for ECE Engineers, Ford & Coulston

ECE 404 Presentations Your presentation should be 10 to 15 minutes for a project engineering team (5-10 min for a team of 2). Due to the limited class time you will be cutoff if you exceed the upper limit. Make sure you read Chapter 12 in the text, Evaluation: Professionalism ‑ appearance, manner, visual aids Clarity ‑ Can we understand what your design is about?  Organization ‑ Is your talk well‑organized? Does it follow a logical progression? Is it presented in a top-down manner?  Completeness ‑ Are all the parts there? Did you provide a good introduction? Clear, positive conclusions and/or summary? etc...  Communication ‑ Did you maintain eye contact with the entire audience? Did they understand you ? etc...  Time Limits ‑ Did you stay within the specified time limits?  Questions ‑ Were you successful at fielding questions after you presentation? Are you knowledgeable on the subject matter ?

ECE 404 Presentations Evaluation and Grade Sheet Good....................OK…....................Poor 4 3 2 1 0 Introduction ___ ___ ___ ___ ___ Clarity ___ ___ ___ ___ ___ Organization ___ ___ ___ ___ ___ Professionalism ___ ___ ___ ___ ___ Communication ___ ___ ___ ___ ___ Conclusion ___ ___ ___ ___ ___ Time limits ___ ___ ___ ___ ___ Completeness ___ ___ ___ ___ ___ Understanding ___ ___ ___ ___ ___ Questions ___ ___ ___ ___ ___ Oral_Pres_Papers.doc