P15010: Arc Wheelchair Swing
/public/

Subsystems Design

Table of Contents

In addition to utilizing the information below, feel free to peruse the team's Subsystems Level Design Documents directory.

Click here for Team P15010's Change Control Process

Final Concept

Concept Development: Platform Swing 10/10/14

Concept Development: Platform Swing 10/10/14

Concept Development: Wheelchair Swing 10/10/14

Concept Development: Wheelchair Swing 10/10/14

Final Concept Development: Wheelchair Swing 10/26/14

Final Concept Development: Wheelchair Swing 10/26/14

System Architecture: 10/30/2014

System Architecture: 10/30/2014

Current Inputs

Safety Subsystem

Specific Project Plan

Detailed Subsystem Design

The most recent version of ADA compliance Standards for Accessible Design is from 2010. There have been additions or changes based on this but I have been using information from documents found the websites below:

a. http://www.ada.gov/2010ADAstandards_index.htm

b. http://www.access-board.gov/guidelines-and-standards/buildings-and-sites/about-the-ada-standards/ada-standards/chapter-10-recreation-facilities

c. https://www.access-board.gov/attachments/article/1369/play-guide.pdf

Utilize sites above and the American National Standard Accessible and Usable Facilities and Buildings 2003 to make decisions. We could request that they review our design but the customer (Arc) has explicitly said that they will not require our product to be “officially approved.” Because of this, we requested that the ARC provide written information that they will be held liable for any issues the swing has in the future. See PDF in project documents of email clarification.

Propulsion Subsystem

Specific Project Plan

Detailed Subsystem Design

Interfaces

Transfer of Energy:

Motor -> Bearings -> Beam 4/Subframe/Platform -> Pendulum Movement

Transfer of Energy, Pendulum:

Decrease in Potential Energy (Height Lost) -> Increase in Kinetic Energy (Speed)

Two forms are Mechanical Energy are Conserved.

Motor/Braking Subsystem

Specific Project Plan

Detailed Subsystem Design

Interfaces

Transfer of Energy:

Engage Brakes with Force -> Leverage -> Brake Pad Forced Against Disk -> Kinetic Energy Lost to Friction -> Heat Energy

Frame Subsystem

Specific Project Plan

Detailed Subsystem Design

Interfaces

Transfer of Energy:

Motor Electrical Energy -> A) Kinetic Energy in the Form of Rotation Around Motor's Axis B) Heat Energy (Friction in the Motor) C) Sound (Noise from Motor) -> Pendulum Movement in Beam 4/Subframe/Platform Assembly -> Kinetic Energy Moves Through Frame to Ground

Must Ensure:

1) That 1' X 1' square beam to floor supports can help stabilize frame as energy is transferred

2) Tile/Brick can counteract force of load swinging with out damage/wear

Wheelchair Platform Subsystem

Specific Project Plan

Detailed Subsystem Design

Platform Swing Subsystem

Specific Project Plan

Detailed Subsystem Design

Interfaces

Transfer of Energy:

A) While on Platform, Participant Pushes Off Ground (Kinetic Energy) B) Participant on Platform, ARC Employee Pushes (Kinetic Energy) -> Pendulum Movement Starts -> Support from Frame, Between Beam 1 and Platform, and Platform Counteracts Load of Participant and Platform Swinging Together (Kinetic Energy) -> Gravity Will Cause Max Potential Energy to Decrease

Must Ensure:

1) Support from Frame, Between Beam 1 and Platform, and Platform Counteracts Load of Participant and Platform Swinging Together (Kinetic Energy)

2) The materials used to attach platform to frame (i.e., rope) can withstand repeated use of swing

Platform to Frame Subsystem

Specific Project Plan

Detailed Subsystem Design

Interfaces

Transfer of Energy:

Kinetic Energy Rotates Beam 4/Subframe/Platform Assembly --> Kinetic Energy used to Move Load in Pendulum Movement

Must Ensure:

1) Beams/Beam to Beam connections that are part of platform to frame subsystem can withstand load without failure

2) The connection between platform and frame is secure and can also withstand load without failure

3) Plate platform piece is not in the way or is fabricated to allow for connection of frame through to angle bars beneath


Home | Planning & Execution | Problem Definition | Systems Design | Subsystems Design | Detailed Design | Build, Test, Document | Publications & Presentations | Photo Gallery