Week 5 Design Lab

Review of Rocket Project Convergent and Divergent thinking Dixon’s Taxonomy

Converging Questions with specific answers Optimizing Selecting Unique answer Answerable Question Many Possibilities

Diverging Generating new ideas (brainstorming) New IdeasPosed Problem

Effective Design Good design teams go through multiple diverge-converge cycles Are effective at transitioning You must be aware of which process you are in.

What kind of thinking did you do? How did divergent thinking apply? How did convergent thinking apply?

Dixon’s Taxonomy Perceived Need Function Physical Phenomenon Embodiment Artifact Type Artifact Instance Feasibility States of Knowledge Describe your final rocket at each state of knowledge

Dixon’s Taxonomy Each design problem has initial state and final state of knowledge Perceived Need Function Physical Phenomenon Embodiment Artifact Type Artifact Instance Feasibility States of Knowledge

Dixon’s Taxonomy What were the initial and final design states for the last 3 weeks of the rocket project? Perceived Need Function Physical Phenomenon Embodiment Artifact Type Artifact Instance Feasibility States of Knowledge

Dixon’s Taxonomy Perceived Need Function Physical Phenomenon Embodiment Artifact Type Artifact Instance Feasibility States of Knowledge What were the initial and final design states for the last 3 weeks of the rocket project?

Dixon’s Taxonomy What were the initial and final design states for the first week of the rocket project? Perceived Need Function Physical Phenomenon Embodiment Artifact Type Artifact Instance Feasibility States of Knowledge

Dixon’s Taxonomy Perceived Need Function Physical Phenomenon Embodiment Artifact Type Artifact Instance Feasibility States of Knowledge What were the initial and final design states for the first week of the rocket project?

Discussion of Crane Project Overview Grading Necessary Tasks

Crane Base Unit Two identical base units, one currently located in project lab. 3 HP motor I-beam pinned Weights- 70 pounds each

Crane Base Unit 48 inches

Crane Base Unit

Project: Design a truss One pulley must be centered above weights at least 36” above the floor. Must lift and return the weights to original starting location

Crane Base Unit: Safety Features These should be considered part of the base unit. Do not remove! These are a redundant safety feature.

Final “Lift Off” Last Lab Period of semester- Monday Dec. 10, Thursday Dec. 13 Two base units operating simultaneously –~20 minutes per team, you must be well prepared! Three test lifts per team –First lift = 70 pounds –Second lift = your choice –Third lift = your choice- max of 1400 lbs.

Performance Equation W = Best weight successfully lifted C = Cost of materials for crane C refers to all materials your team takes, whether you end up using it in your crane or not!

Cost and Availability of Materials Aluminum is $3 per kilogram. Price of plastic is $0.80 per kilogram. Density of each is provided in handout. Plastic and aluminum bar stock available in ¼” thickness, various widths. Max 75 cu. in. of each material. Four free “transactions” per team.

Grading 20% of course grade is based on performance 20% of course grade is based on final report To earn a passing grade on performance crane must lift 70 lbs.

Grading 20% of course grade is based on performance 20% of course grade is based on final report To earn a passing grade on performance crane must lift 70 lbs. Lifting the minimum weight with the maximum material will earn a D.

Engineering Tasks Truss Design –Compute Forces –Failure Analysis –Optimization –Fabrication Materials Testing- Plastic –Select 2 Tests –Conduct Tests –Interpret Results

Engineering Tasks Truss Design –Compute Forces –Failure Analysis –Optimization –Fabrication Materials Testing- Plastic –Select 2 Tests –Conduct Tests –Interpret Results CEE and ME are taking statics now, ECE will take in spring

Engineering Tasks Truss Design –Compute Forces –Failure Analysis –Optimization –Fabrication Materials Testing- Plastic –Select 2 Tests –Conduct Tests –Interpret Results ChE, CEE and ME students all take one or more courses on materials science

Engineering Tasks Truss Design –Compute Forces –Failure Analysis –Optimization –Fabrication Materials Testing- Plastic –Select 2 Tests –Conduct Tests –Interpret Results Rigorous optimization requires programming skills- MATLAB will be used for this project

What kind of thinking will you do? How will divergent thinking apply? How will convergent thinking apply?

What kind of project is this? Perceived Need Function Physical Phenomenon Embodiment Artifact Type Artifact Instance Feasibility States of Knowledge

What kind of project is this? Perceived Need Function Physical Phenomenon Embodiment Artifact Type Artifact Instance Feasibility States of Knowledge

Dixon’s Taxonomy Future design problems continue to increase in complexity Perceived Need Function Physical Phenomenon Embodiment Artifact Type Artifact Instance Feasibility States of Knowledge