welcome to sophomore engineering clinic i. instructor introduction personal data surveys sent by...
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Welcome to Sophomore Engineering Clinic I
Instructor Introduction Personal Data Surveys Sent by email Fill out ASAP
Before we get started…
Sophomore Engineering Clinic
•Technical Communication• Most products are not built by engineers.• Engineers produce prototypes, product
designs and process designs, lab reports and design reports
•Engineering Design• Design is open ended, and problems are
often ill-posed.
Bottle Rocket (4 Weeks) Research Project/Prof. Development (4
Weeks) Some overlap with Bottle Rocket Project
Final Project (6 Weeks)
Schedule
Bottle Rocket Design
Design and fabricate a rocket out of a soda bottle.
Materials: 2 L soda bottle Foam Board Clay Duct Tape Water
Rocket will be pressurized to 40 PSI
Bottle Rocket Design
Goal- Design a rocket that will fly the farthest. Only “perpendicular” distance counts.
Using Parametric Design
Parametric Design: Using parameters to define a large number of instances, and then selecting the best one.
Examples:
Developing Parametric Models
Start with a rectangle Identify a family of shapes by defining one
parameter
2
3
Parametric Model – Case I
A family with 1 parameter
2
Width
Parameter = WidthHeight = 2 (constrained)
Parametric Model – Case I
A family with 1 parameter Defined an infinite number of design instances
2
Width
Parametric Model – Case II
Identify the family of shapes for a constrained width
2
3
Parametric Model – Case II
A family with 1 parameter. Defined an infinite number of design instances.
Height
3
Parameter = HeightWidth = 3 (constrained)
Parametric Model – Case III
X- and Y-Coordinates of 3 nodes are parameters Identify the family of shapes with one node
constrained
2
3
Parametric Model – Case III
Shapes are not constrained to rectangles
An Example Parametric Model for a Fin Family
Right triangles with height to length ratio of 2:1 Size and shape of fins are defined by either height or length
For Next Week
Develop a parametric model for a rocket with 3 parameters: Amount of water in rocket, Mass of clay used, 1 parameter to describe a family of fins.
Constraints
Clay is placed only in front of rocket, in a rounded shape.
Exactly 3 wings, placed 120o apart. Duct tape is used only to secure wings and clay to
bottle. Fin size and shape belong to a family that is defined
by a single parameter. (you define the appropriate parametric model for the wings)
Example test results
Holding 2 parameters constant while varying the third allows a systematic study of behavior to be recorded.
Take notes. The optimal value of one parameter might depend on the
values of the other two parameters. Observations should influence design.
Water (liters)
Dis
tanc
e (f
t)
Note:
Your grade for an upcoming report will be based on the technical description of the parametric model you develop
The grade of this report for this project will not be based on your final distance.
Assignment
Requirements for Next Week: Have your section leader ok your parametric model. Perform experiments to determine the set of
parameters that maximizes the distance. Communicate intelligently about parametric design The parametric model for the rocket cannot be
changed after a few tests. Choose a family of fins!
Find your Team and Instructor Introduce yourselves What is your unique fact?
Video and/or Design Questions of the Day What are you going to do to help your team succeed? What is Design? Any questions about project?
After Testing – Find your Instructor Discuss observations from the first test day
Before we start launching…