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Engineering Design Process

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twyla bowditch

on 19 June 2015

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Transcript of Engineering Design Process

Identify the Problem
First, we understood that we had to build a truss bridge out of balsa wood, and to be linked by glue.
The limitations that ensued was that the bridge must have room for a 3/8" J-Bolt and it shall allow an 8"x3"x3/4" test block to pass through it.
Also, the truss system and road bed must be 12" long and 3" wide.
The bridge can't have any structures under the abutments.
The mass of the bridge may not exceed 20 grams
I chose this original design because I thought it was the strongest and the most efficent Before I choose my design I thought about what place it would be best to put the triangles
Construct a prototype
Our bridge held a good amount of weight for the size, materials, and weight of the bridge.
We collected the data below when we tested our bridge.
The weight of our bridge in grams is
14.6 g.
The weight our bridge held in pounds is
15 lb.
The weight our bridge held in grams is
6803.89 g.
The efficiency rating of our bridge is
Select the best possible solution
We went with a style similar to the warren through truss design because of the design of triangles that made it strong and most efficent
Instead of us just doing a series of big triangles we added one small triangle to each side so it would have more support
Engineering Design Process
the results
We continued into groups after our original bridge designs were finished where we compromised on the final design of our bridge drawings.
We finished our final drawings on the CAD program and printed them out.
We used our printed blueprints to guide us as we built our bridge of balsa wood and glue.
Test and Evaluate
The negatives were...
We had an error in our bridge and we had to redo that piece, which could have been a weak spot.
We had numerous slight building flaws as we constructed our bridge.
We learned about shapes in structures on PBS Bridges.
We learned that triangles are the strongest shape and to use them when possible, if constructing something.
If you had a square, you could strengthen it with diagonal internal supports.
Also, we discovered that when a structure is under pressure it will bend, and eventually snap when it can hold no more.
The forces that acted on our bridge consisted of bending, tension, and compression.
Bending happened when the force was applied at the middle of the bridge, it sagged down.
Tension occurred when the vertical and vertically diagonal members were pulled down.
Compression happened on the verically diagonal members.
Our bridge was successful but we hoped for better results
The positives were...
Our bridge was light in weight
We had an strong bridge design in CAD
We had mostly well constructed corners.
If we were to redesign we would...
Make sure that the error in the top of the bridge was fixed before glueing
Checked for the slight flaws in constructing
Add more support to the bridge overall
When building my design I chose what I thought would be the most sensible choice for what I planned to achieve.
I chose this design because I thought the double warren was strong but also lightweight
I choose the double warren truss design because it looked strong but not too complex like the arch. Also, when driving around, I see a lot of truss bridges that are single warren, but with more supports, it should be stronger. For the road bed, the reason I chose the pattern was because I knew that triangles are the strongest shape so we should make a lot of them.
Engineering Design Process

Harrison Burke
Twyla Bowditch
Noah McIntyre
Sam Hartley-Matteson
Full transcript