Document Type

Undergraduate Project

Date of Degree Completion

Spring 2024

Degree Name

Bachelor of Science

Department

Mechanical Engineering Technology

Committee Chair

Charles Pringle, PE

Second Committee Member

Dr. John Choi

Third Committee Member

Mr. Chris Berkshire

Abstract

The problem presented throughout this report was to create a small-scale bridge made entirely out of balsa wood and glue, that could withstand substantial force, as well as perform a lifting/lowering cycle. Other requirements associated with the bridge were properties of weight, deflection, size, and shape. This problem presented a challenge that tested the mathematical side of engineering, being strongly reliant on statics, mechanics of materials, and mechanical design analyses.

To approach this problem, the first step was to complete in depth calculations of the chosen design. With this done, manufacturing and assembly was able to be completed. With a prototype of the bridge completed and ready for testing, engineering methods were employed to test and improve the design. These methods included testing the bridge weight via a scale, as well as testing the strength with weights anchored at the bridge center. The articulation cycle was tested using repeated cycles and trials, which was aimed to help fine tune the cycle accuracy and speed.

The results of these tests helped shape the bridge design. The bridge weighed in at 91 grams, which was 6 grams overweight, meaning the design of the bridge needed refining to lose weight. Aside from this, the results of the light weight testing demonstrated the bridge’s strength; it was able to withstand 80% of the required final load, without any visible deflection or buckling. The articulation cycle was tested using a timer, and the full cycle was able to be completed within 20 seconds.

Keywords: manufacturing, refining, articulation, balsa wood, bridge.

Download

Share

COinS