Presentation on theme: "Chapter 6: Product Specifications Product Design and Development Fifth Edition by Karl T. Ulrich and Steven D. Eppinger."— Presentation transcript:
Chapter 6: Product Specifications Product Design and Development Fifth Edition by Karl T. Ulrich and Steven D. Eppinger
Access objects in the bag quickly and easily. The person must be able to retrieve items of interest in an unawkward fashion. A user should be able to access common items while standing up with minimal effort. Be able to locate items easily in the bag. Customer needs an easier way to pay for purchases. More storage options for better organization. New location for checkbook. Person needs a way to see into the backpack easily so that they can find checkbook easier. Customer needs bag with compartments they can reach while wearing the bag. A wallet with a debit card and built in ID. Hands free way of holding bag so both hands can be used in looking for stuff. Velcro pockets on the outside to hold wallet, checkbook and such. Reflection on Customer Need Statements
Suggested Solutions See how the leather on the bottom of the bag is all scratched; it’s ugly. When I’m standing in line at the cashier trying to find my checkbook while balancing my bag on my knee, I feel like a stork. This bag is my life; if I lose it I’m in big trouble. There’s nothing worse than a banana that’s been squished by the edge of a textbook. I never use both straps on my knapsack; I just sling it over one shoulder. The bag maintains its original appearance with use. Bag allows easy access to items Bag is easy to find. The bag protects fragile items from damage. The bag can rest securely in multiple modes (either or both shoulders.) The bag can be carried comfortably in multiple modes (one shoulder strap, two shoulder straps, or hand hold.)
Planning Product Development Process Concept Development Concept Development System-Level Design System-Level Design Detail Design Detail Design Testing and Refinement Testing and Refinement Production Ramp-Up Production Ramp-Up Remember that we are looking at an overall Product Development Process. We are going into more detail on Concept Development. We did a lecture, quiz and homework assignment on customer needs. Now we are ready to go to the next step in Concept Development.
Concept Development Process Perform Economic Analysis Benchmark Competitive Products Build and Test Models and Prototypes Identify Customer Needs Establish Target Specifications Generate Product Concepts Select Product Concept(s) Set Final Specifications Plan Downstream Development Test Product Concept(s) Development Plan Target Specs Based on customer needs and benchmarking Final Specs Based on selected concept, feasibility, models, testing, and trade-offs
Basic control and reference document for the design and manufacture Specific, measurable, testable criteria “Unambiguous, Understandable, Correct, Concise, Traceable, Traced, Design Independent, Verifiable, Unique, Complete, Consistent, Comparable, Modifiable, Attainable” Functional decomposition Performance targets Constraints (Demands, Musts) Goals (Wishes, Wants) Features Product Design Specifications
The Blind Men and the Elephant A Hindu fable by John Godfrey Saxe from Elephants Ancient and Modern by FC Sillar and RM Meyler. It was six men of Indostan To learning much inclined, Who went to see the Elephant (Though all of them were blind), That each by observation Might satisfy his mind. The First approached the Elephant, And happening to fall Against his broad and sturdy side, At once began to bawl: `God bless me! but the Elephant Is very like a wall!' The Second, feeling of the tusk, Cried, `Ho! what have we here So very round and smooth and sharp? To me 'tis mighty clear This wonder of an Elephant Is very like a spear!' The Third approached the animal, And happening to take The squirming trunk within his hands, Thus boldly up and spake: `I see,' quoth he, `the Elephant Is very like a snake.' The Fourth reached out his eager hand, And felt about the knee. `What most this wondrous beast is like Is mighty plain,' quoth he; `'Tis clear enough the Elephant Is very like a tree!' The Fifth who chanced to touch the ear, Said: `E'en the blindest man Can tell what this resembles most: Deny the fact who can, This marvel of an Elephant Is very like a fan!' The Sixth no sooner had begun About the beast to grope, Than, seizing on the swinging tail That fell within his scope, `I see,' quoth he, `the Elephant Is very like a rope!' And so these men of Indostan Disputed loud and long, Each in his own opinion Exceeding stiff and strong, Though each was partly in the right, And all were in the wrong! So, oft in theologic wars, The disputants, I ween, Rail on in utter ignorance Of what each other mean, And prate about an Elephant Not one of them has seen!
Writing a good PDS is very difficult Customer Regulatory Bodies Laws of Physics Functional Analysis Company Constraints Social, Political, and Legal Requirements
The Product Specs Process Set Target Specifications – Based on customer needs and benchmarks – Develop metrics for each need – Set ideal and acceptable values Refine Specifications – Based on selected concept and feasibility testing – Technical modeling – Trade-offs are critical Reflect on the Results and the Process – Critical for ongoing improvement
Product Specifications Example: Mountain Bike Suspension Fork
Start with the Customer Needs
What are some customer needs for the catapult-like device? Size matters not.
Establish Metrics and Units
Metrics Exercise: Ball Point Pen Customer Need: The pen writes smoothly.
Additional Areas to Consider Physical requirements Functional requirements Service environment (comprehensive: insect and bird damage) Kinematics – type of motion, direction, velocity, acceleration Forces - direction, magnitude, frequency, resonance, stiffness Materials – properties of final product, flow of materials, design for manufacturing
Design Specification Checklist Performance At what speed must it operate? How often will it be used (continuous or discontinuous use)? How long must it last? Environment (during manufacture, storage and use) All aspects of the product’s likely environment should be considered: for example temperature, humidity, risk of corrosion, vibration. Target product cost This is strongly affected by the intended market. Competition What is the nature and extent of existing or likely competition? Does our specification differ from the competition? If so, why? Quantity and manufacture Should it be made in bulk, in batches, or as individual items made to order? Does it have to be a particular shape? Can we make all the parts or must we buy some in? Materials Are special materials needed? Do we have experience of working with the likely candidate materials? Quality and consistency What levels of quality and consistency does the market expect for this product? Does every product have to be tested? Standards Does the product need to conform to any local, international or customer standards? Is the product safe? Patents Are there any patents we may either infringe or register? Packaging and shipping How will the product be packaged? How will the product be distributed? Aesthetics and ergonomics Is the product easy and fun to use? Is it attractive to the right customer? Market constraints Does a market already exist or must it be created? What is the likely product lifetime? How long do we have to get the product to market? What are the customers’ likes and dislikes? Company constraints Does the product fit in with company image? Are we constrained in material or process choice? Are there any political considerations?
More Things to Think About Production – Factory limitations, outsourcing, tolerancing (You may wait on actual tolerances until later – just think about the big picture.) Assembly Transport Costs Schedule Life-cycle issues Human factors
Social, Political, Legal Safety and environmental regulations STANDARDS – – – – – – Safety and product liability Patents and intellectual property
Link Metrics to Needs
Benchmark on Customer Needs
Benchmarking Product Design by Otto and Wood, 2001 Look at your customer needs and your metrics Form a List of Related or Competitive Products Conduct an Information Search Establish Best-in -Class Competitors Develop Specifications – Less than – Greater than – Range – Discrete values – Exactly X
Sources of Product Information Library Thomas Register Market Share Reporter National Bureau of Standards Census of Manufactures Moody’s Industry Review Consumer Reports Magazine Trade Magazines Patents Market Research Databases – DIALOG, Predicasts, American Demigraphics Web Vendors Technical Specialists Experts/Friends in Industry NAICS (North American Industry Classification System) Codes
Here are some ideas that you might like. Please feel free to generate your own!
DOE 1 CUT FOLD DOWN FOLD UP WING 1 LENGTH WING 2 LENGTH FOLD DOWN CUT FOLD UP HELICOPTER 1 HELICOPTER 2 FOLD UP FIRST FOLD UP END CUT BODY 2 LENGTH BODY 1 LENGTH BODY 1 WIDTH BODY 2 WIDTH DOE 1 Design for
Now What? Can you get there from here? Make a functional model of the product Make a technical model of the product Make a cost model of the product Refine the specifications, making trade-offs where necessary. Flow down the specifications as appropriate Reflect on the results and the process.
Specification Trade-offs Score on Monster (Gs) Trade-off Curves for Three Concepts Estimated Manufacturing Cost ($)
Set Final Specifications
Quality Function Deployment (House of Quality) technical correlations benchmarking on needs customer needs engineering metrics target and final specs relative importance relationships between customer needs and engineering metrics