YES U CAN – ADAPTIVE CYCLING
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YES U CAN – ADAPTIVE CYCLING University of Delaware , Department of Biomedical & Mechanical Engineering, Newark, DE Team Members: Brendan Farrell, David Huegel, Shane Kelly, Zack Rogers, Laura van der Post Advisors : Dr. Steve Timmins & Dr. Jennifer Buckley. Want/Need. Metric.

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YES U CAN – ADAPTIVE CYCLING

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Yes u can adaptive cycling

YES U CAN – ADAPTIVE CYCLING

University of Delaware , Department of Biomedical & Mechanical Engineering, Newark, DE

Team Members: Brendan Farrell, David Huegel, Shane Kelly, Zack Rogers, Laura van der Post

Advisors : Dr. Steve Timmins & Dr. Jennifer Buckley

Want/Need

Metric

Evaulation Plan

Safety

Stopping distance

Brake test

Affordability

Cost

Cost analysis

Comfort

# of sharp objects

Road testing

Time until

Calculation based on

Durability

components need

battery capacitance

replacement

Drive System

Key Highlights:

- Two chains and a stepper motor drive the trike via a joystick

- 1st chain:

Drive motor sprocket to cassette

2nd chain:

Cassette to the front sprocket

- Goal is to allow a quadriplegic (who has no movement in her legs) to exercise

Introduction

Purpose:

Yes U Can is a non-profit organization that creates opportunities for those with physical disabilities to become more active.

Customers:

Vickie George, CEO and President, is a quadriplegic and suffers from a degenerative form of Multiple Sclerosis

Wayne Hunter, YUC engineering consultant, is working with us in developing the drive, braking, and steering systems

Braking System

A balance bar attaches to all three brake cables (2 from back and 1 from front)

A linear actuator with a connected spring will be attached to the balance bar and will help in providing tension in the cables

Braking by default system: the brakes are always engaged unless the user provides input through the joystick

Figure 1: Mock-up of stepper drive motor connection

Figure 5: YUC – Adaptive Cycling team with Vickie George and Wayne Hunter

Figure 7: Model of the braking system with associated clamps and linear actuator

  • The Design

  • The project scope is to prototype an electrically-driven tricycle that allows a quadriplegic to become more physically active

  • The overall design encompasses the following:

    • Linear actuator controlled braking and steering systems

    • Stepper motor drive system

    • Battery powered electrical system

    • Balance bar braking concept

    • Aluminum machined clamping systems

  • FES (Functional Electrical Stimulation) will act as the main drive system with the electrically-driven system serving as a backup

Figure 8: Model of the balance bar concept which provides accurate tension in each brake cable

Figure 2: Mock-up of drive system chain connections on the trike

Steering System

Utilizes a linear actuator to push and pull on a 3 inch lever arm located at the front of the trike

Features a 30 degree turning angle in each direction, which has been calculated to be safe and efficient

Clamps are used to connect the linear actuator to the frame of the bike with a clevis attaching to the steering rod

Electrical

Batteries – Four 12V 35Ah batteries will be used to power the bike

Proof of concept of electrically-driven systems is demonstrated with a toggle switch

A battery pack has been manufactured to store the heavy batteries on the back of the trike

Figure 6: Model of the complete assembly with all systems incorporated

  • Metrics & Testing Plan

  • FEA (Finite Element Analysis) – high factors of safety

  • Engineering calculations

  • Physical testing with team members and Vickie

  • Table 1: Wants & needs along with associated metrics and evaluation plans for testing

Figure 3: Model of the steering actuator system

Figure 9: Electrical setup for joystick control of drive stepper motor

Acknowledgements

Dr. Steve Timmins – YUC Trike Team Advisor

Dr. Jennifer Buckley – YUC Assistant Advisor

FSAE Team

Vickie George & Wayne Hunter – Yes U Can

University of Delaware – Mechanical Engineering

Figure 4: Model of the clevis attachment clamp to lever rod


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