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University of Notre Dame AME 470 Ltd. Team Unum. Critical Design Review. Team Unum Structure. Team Leader: Frankie Bott Chief Engineer: Jose Viso CAD Engineer: Jim Hyde Fabrication Engineer: Tim Culbertson Controls/Electronics: Chris Tilton. Solving the Problem of Accurate Inflation:.

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Critical design review

University of Notre Dame AME 470 Ltd.

Team Unum

Critical Design Review

AME 470 – Team Unum


Team unum structure
Team Unum Structure

Team Leader: Frankie Bott

Chief Engineer: Jose Viso

CAD Engineer: Jim Hyde

Fabrication Engineer: Tim Culbertson

Controls/Electronics: Chris Tilton

AME 470 – Team Unum


Solving the problem of accurate inflation
Solving the Problem of Accurate Inflation:

  • The objective of the Aura Valve is to aid in accurate inflation of athletic balls and bike/automobile tires.

  • By applyingcontrol technology to this task, the Aura Valve eliminates the guess-work involved in the inflation process.

  • The Aura Valve can be used with existing inflatables and air sources, which makes it a truly user-friendly and universal tool.

AME 470 – Team Unum


Overview of the aura valve
Overview of the Aura Valve

  • Electrical Subassembly

    • Sensing and Control of Airflow

  • Mechanical Subassembly

    • Physical movement of air from source to inflatable

  • User Interface

    • Customizable to the needs of the user, as well as displaying the status of the inflation process

AME 470 – Team Unum


Design requirements
Design Requirements

  • Pressure Range

    • Input: 0-80 psi

    • Output: 0-65 psi

  • Standard ¼” internal connections

  • Standard external connections to inflatable and air supply

  • Weight: less than 3 pounds

  • Volume: 7” X 4.5” X 5”

  • User interface

AME 470 – Team Unum


Electronic subassembly
Electronic Subassembly

AME 470 – Team Unum


Solenoid valve

MiniMAX

Solenoid

Vcc (5 V)

I/O Pin

Relay

Diode

Transistor

Power

Ground

Solenoid Valve

  • ASCO Valve

  • Model P/N 8320G184

  • 12 Volts DC

  • 400 mA current

  • 0-115 psi

AME 470 – Team Unum


Pressure sensing

Transducer

Vcc (5 V)

MiniMAX

I/O Pin

Ground

Pressure Sensing

  • Motorola MPX5700GP-ND

  • Req’d Voltage: 5 V

  • Accuracy: 0.5%

  • Pressure Range: 0-101.5 psi

  • Weight: <7 Oz.

Connection to system

Transducer

AME 470 – Team Unum


Mechanical subassembly
Mechanical Subassembly

AME 470 – Team Unum


User interface
User Interface

AME 470 – Team Unum


Control logic
Control Logic

{MiniMAX is connected to power}

  • If ENTER button is pressed

    • Prompt user for desired pressure

    • Begin reading pressure data from transducer

    • Display target pressure and current pressure

      {User enters pressure value with pushbuttons}

  • If current pressure < target pressure

    • Activate relay

      {Relay turns on solenoid and the vessel begins inflating}

  • If current pressure = target pressure or KILL button is pressed

    • Turn off relay

      {Relay turns off solenoid, vessel stops inflating}

  • If ANY button is pressed

    • Restart the program from the beginning

MiniMax

AME 470 – Team Unum


Housing
Housing

AME 470 – Team Unum


Cost of prototype development
Cost of Prototype Development

Most Expensive Component:

Solenoid Valve ($89)

Housing Fabrication:

$70

Electronic Components: $56

Hosing and Fittings: $25

AME 470 – Team Unum


Working prototype
Working Prototype

Air Source is connected to the Aura Valve

LCD displays instructions and status for user interface

Buttons allow user to operate the Aura Valve

Inflatable connected to Aura Valve through the Smarthead

AME 470 – Team Unum


Prototype strengths and weaknesses
Prototype Strengths and Weaknesses

  • Strengths:

    • User friendly

    • Consistent performance

    • Functionality

    • Proof of Concept

    • Compatibility/ Universality

  • Weaknesses:

    • Cost

    • Size

    • Portability

    • Weight

    • Robustness

AME 470 – Team Unum


From prototype to product
From Prototype to Product

  • Improved Portability

    • Reduction of Size

    • Ergonomic Design

    • Rechargeable Battery

  • Improved Robustness

    • Withstand a drop of 5 feet

    • Waterproof for use in all weather conditions

AME 470 – Team Unum


Thank you for your attention
Thank You for your Attention!

Any questions?

AME 470 – Team Unum


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