quiz preparation
DESCRIPTION
Quiz Preparation. Have Quiz sheet ready. Top Center : QUIZ 2 Upper Right: Name (L, F, MI), Today’s date 8/28/12 Lab day , time section number. Announcements. Each team must purchase the following before Lab 5: 2 Lego Power Functions 8883 M-Motors Approx. $10 each - PowerPoint PPT PresentationTRANSCRIPT
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Quiz Preparation
Have Quiz sheet ready. Top Center: QUIZ 2 Upper Right:
»Name (L, F, MI), »Today’s date 8/28/12 »Lab day , time» section number
Lab Day/Time Section Number
Mon. 1:00 8Mon. 3:00 9Wed. 1:00 10Wed. 3:00 11Thu. 2:00 29Fri. 1:00 12
Lab Day/Time Section Number
Mon. 1:00 8Mon. 3:00 9Tue. 2:00 36Wed. 1:00 10Wed. 3:00 11Thu. 2:00 35Fri. 1:00 12
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Announcements
Each team must purchase the following before Lab 5:» 2 Lego Power Functions 8883 M-Motors» Approx. $10 each
Waiting to hear about availability from the Scientific Supply Store on campus.
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Quiz
1. What does your team need for Lab 5 (select only one answer) ?» a. Two LEGO motors» b. Keypad code» c. bucket of LEGOs
» 2. Motors are provided for you at no cost (True or False).
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Design Project
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Competition Each team designs and builds a car
» Specifications in syllabus» Work on car done outside of class» Team must build the car with their own supplies
– No supplies are provided
Lectures/Labs 1-7 provide background material for the design project
Start early on the design project!
COMPETITION –Thursday, 11/8, at 7 PM in BR 125.
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START/FINISH
BLOCK
Required Gates
Optional Gates(+5 sec. penalty if missed)
Push block across finish line or incur a +30 sec. penalty
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Identify Customer NeedsEstablish Product Specification
Define Alternative ConceptsSelect the Most Suitable Concept
Design/Integrate SubsystemsBuild/Test Prototype
Design/Build ProductionProduceTrack
Engineering Design Process
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Quiz
3. In this class, our design process stops after» a. Prototyping (making one)» b. Production (making many)
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Engineering Design Process
Identify Customer NeedsEstablish Product Specification
Define Alternative ConceptsSelect the Most Suitable Concept
Design/Integrate SubsystemsBuild/Test Prototype
Design/Build ProductionProduceTrack
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Engineering Design Process Example: Zero-Emission Vehicle
Identify customer needs.» “I want a vehicle that is affordable.”» “I want a vehicle I can use to drive to and from
work every day.”» “I want a vehicle that does not pollute the
environment.”» “I want a vehicle that is safe to operate.
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Engineering Design Process
Identify Customer NeedsEstablish Product Specification
Define Alternative ConceptsSelect the Most Suitable Concept
Design/Integrate SubsystemsBuild/Test Prototype
Design/Build ProductionProduceTrack
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Engr. Design Process (cont’d) Establish product specification.
» Performance should be comparable to a conventional automobile.
» Initial purchase cost should be $30,000.» Consumables must be recyclable or not release
toxins to the environment upon disposal or an accident
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Quiz
4. Which one establishes a contract between the customer and the supplier?» a. Customer needs» b. Specifications
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Engineering Design Process
Identify Customer NeedsEstablish Product Specification
Define Alternative ConceptsSelect the Most Suitable Concept
Design/Integrate SubsystemsBuild/Test Prototype
Design/Build ProductionProduceTrack
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Brainstorming The brain uses two basic modes in the design
process:» creative mode» critical mode
These two modes work against each other. Some people are better at one mode than the other Brainstorming separates the two processes into
different time frames. It is important not to think critically during
brainstorming.
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Engr. Design Process (cont’d)
Define alternative strategies» Lithium-ion battery» Lead-acid battery» Compressed Air» Etc.
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Engineering Design Process
Identify Customer NeedsEstablish Product Specification
Define Alternative ConceptsSelect the Most Suitable Concept
Design/Integrate SubsystemsBuild/Test Prototype
Design/Build ProductionProduceTrack
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Engr. Design Process (cont’d)
Select the most suitable concept.» Cost
– Design cost– Material cost– Assembly cost
» Weight» Appearance» Performance» Safety
» Environmental risks» Reliability» Ease of use
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Tradeoffs in Engineering Design
Examples: Cost vs. performance Safety vs. performance Performance vs. reliability
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Selecting the Most Suitable Concept
Typically, you have» Several design alternatives» Multiple, often conflicting, criteria
How do you sort all this out?
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Pugh Chart
BEST
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Design Reports
A Pugh chart will be REQUIRED for each design decision in your preliminary and final design reports.
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Pugh Chart Advantages
Gives structure to the decision-making process
Documents the decision-making process
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Alternative Methods
Positives and Negatives (Pros vs Cons) Analytical Hierarchy Process House of Quality Method
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House of Quality
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Quiz
5. Brainstorming is the process of critiquing various alternatives to select the best one.
Write TRUE or FALSE
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Engineering Design Process
Identify Customer NeedsEstablish Product Specification
Define Alternative ConceptsSelect the Most Suitable Concept
Design/Integrate SubsystemsBuild/Test Prototype
Design/Build ProductionProduceTrack
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Engr. Design Process (cont’d)
Design the subsystems and integrate them» Break a complex system into small subsystems
Body Motor/Trans.
Power Mgmt Electrical
Zero-Emission Car
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Engineering Design Process
Identify Customer NeedsEstablish Product Specification
Define Alternative ConceptsSelect the Most Suitable Concept
Design/Integrate SubsystemsBuild/Test Prototype
Design/Build ProductionProduceTrack
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Engr. Design Process (cont’d)
Build and test a prototype» Build and test each subsystem» Integrate and test the subsystems
Body Motor/Trans.
Power Mgmt Electrical
Zero-Emission Car
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Engineering Design Process
Identify Customer NeedsEstablish Product Specification
Define Alternative ConceptsSelect the Most Suitable Concept
Design/Integrate SubsystemsBuild/Test Prototype
Design/Build ProductionProduceTrack
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Design for Lego Car Specification is given. Define alternative concepts. Select the most suitable concept.
» Bottom line is finishing time.» “Cost” is figured in by penalizing use of parts.» Car should be sturdy enough not to fly apart
during race.» Car and course must pass minimal safety specs.
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Design Subsystems
Car path & steering strategy Power supplied to vehicle Torque vs speed Vehicle mass, wheels, etc.
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Lego Car Subsystems Output voltage
» Higher output voltage increases speed» Penalties apply above 10V
Power supply (batteries)» One 9V battery (light, but less than 10V)» Two 9V batteries (≥10V, but heavy)» Watch batteries (very light, but drain quickly)
Wheel size and gears» Torque vs. speed tradeoff
Drive strategy» Front wheel vs. rear wheel drive
Course path» Passing through all gates vs. missing gates» Pushing block vs. not pushing block
Body» Light vs. heavy
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Further Design Steps
Build and test, then modify!!! Production design, distribution, and
tracking are not relevant to a single-shot prototype design.