Date of Award

2022

Degree Type

Capstone Project

Abstract

Team 16 was tasked with the problem of developing a device to climb a tree with the ability to work freely while the device is in the tree. To accomplish this, previous designs were thoroughly researched, specific materials and tree types were inspected by team members and a preliminary patent search was conducted to further the knowledge base of previous designs and ideas for the device. Conducted literature searches brought information about frame shape, orientation and weight as well as specific types of metals that should be used for a lightweight but durable design. The team generated 120 design concepts, classified them into groups and a Quality Function Deployment comparison was performed.

The design uses a low carbon steel frame with two wheels attached on either side of the tree that act as a cantilever to keep the device from falling. The far wheel is attached to the pivot end as this wheel is receiving no power and free spinning. The drive wheel is on the other side of the tree and is attached to the drive train. The operator is located behind the drive wheel to obtain more force on the tree from the cantilever in order to increase the factor of safety. The force from the drivetrain is designed to be powered by geared bike pedals but is also designed to be easily changeable with an electric motor. Through inspection of this prototype and SolidWorks Stress and Strain simulations, this design is deemed to fulfill the problem definition and requirements.

The accomplishments of this project involved many different aspects such as; welding, notching of pipes, sawing, and testing. Although the task was complete the team did fall short of having a successful tree bike. This project involved a huge learning curve for the group to be able to machine and weld. As a team, they learned how to weld and machine together while helping each other throughout. The frame was constructed and achieved a factor of safety much higher than required for the project. A gearbox was developed and 3D printed by Inkbit, a 3D printing company that sponsored the group. Everything needed for the project such as; brakes, mounts, axles, wheels, and various custom parts were completed and assembled. Unfortunately, the 3D printed gears would not refrain from slipping on the axles causing the TreeBike not to work properly. Testing for the project was successful. The tests completed were friction, weld strength, and corrosion of the material. All tests were done by developing a study and closely monitoring the results.

Comments

Team Name: Team 16, Treetop

Sponsor: Professor Bahram Nassersharif

Document Reference: URI-MCE-CAP-PDR-16-2022

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