RYAN LIUDesign Portfolio | mechanical engineering

JAN 2012 AUG 2012 MAY 2013 JULY 2013

HELIUM CANNON

HUMANITARIAN

COOKSTOVE

SMOOTHIE MACHINE

PHOTOGRAPHIC

SCANNER

problem

There is a need for safer alternatives to

police and military’s rubber bullets

CANNON STOVE SMOOTHIE SCANNER

objectiveDesign a cannon to test

rubber bullet alternatives

My project focus:

Technical Design and

Manufacturing

Ballistics Lab

UC Berkeley

Ask

Imagine

Plan

Create

Improve

Soft Bullet>100 MPH

High Pressure System

challenges

Navier-Stokes Design Principles

• Minimize Internal Volume

• Minimize Internal Bends

• Minimize Gas Viscosity

Bra

ins

torm

5 foot long 4130 Steel

barrel to maximize

energy transfer

6061 T6 Aluminum for

manufacturability and

great strength to cost

Quick, Bolt-Action Style Loading

Linear design to

encourage smooth

streamlines.09 second

valve opening

time

3000 PSI Helium

to reduce fluid

viscosity

150 ft/s soft

bullets distribute

impact force

Small internal volume

to minimize energy

loss

solution

problem

Indoor air pollution is the 4th worst risk factor for disease in developing countries.

CANNON STOVE SMOOTHIE SCANNER

objectiveImprove cookstoves to

reduce smoke inside rural

Bolivian kitchens.

My project focus:

Humanitarian Design

CAD

Ask

Imagine

Plan

Create

Improve

Cedesol, NGO

Bolivia

Design Difficult to Modify

Adding to design easier than modifying

Lack of Testing Resources

Testing shows de-centralized heating

Very few resources available

Difficult to implementdesign changes with existing assembly line

challenge

Plasma cutter

assembly line

Makeshift

“smoke wand”

solution

Find maximum dimensions

Create design modifications

Create full CAD Distribute designs worldwide

New Hoop

Maintains assembly line

Concentrates heat

Channels airflow

problem

There is a need for quick and

healthy alternatives to delicious,

delicious ice cream.

CANNON STOVE SMOOTHIE SCANNER

Create an automated smoothie machine that uses semi-frozen fruit

My project focus:Fruit dispenser design and manufacturing

Mechatronics Course

UC Berkeley

objective

Ask

Imagine

Plan

Create

Improve

challenges

Dispensing Ideas Considered

Secondary Responsibilities

Non-uniform

material

Many subsystems

to integrate

α β

Sliding Box

dispenses equal

amounts of fruit

Automating Mechanisms

Dispensing Liquid

Covering Blender

1. Main wheel

rotates fruit tubes

2. Fruit dispensers

opens and closes

3. Liquid dispenser

adds milk4. Lid seals blender

5. Blender turns on

6. Smoothie dispenses

and blender self-washes

solution

Our survey results from Darfur are often blurry or incomplete and were unreadable back at home.

problem

CANNON STOVE SMOOTHIE SCANNER

objectiveCreate a cell phone

“scanner” that ensures

readable pictures

My project focus:

User-Centric Design

Humanitarian Design

Ask

Imagine

Plan

Create

Improve

Darfur Stoves Group

Lawrence Berkeley Lab

User Needs

Must be:

Benchmarking:

Bra

ins

torm

challenges

How do people transport things?

Applicable

Co

st Effective

Locally repairable Durable

User FriendlyIntuitive

Intuitive User friendly

Locally repairable Durable

solution

Swivel Clip to Secure Different Paper Sizes

Guide rails to ensure paper alignment

Groove to lift and lower the stand quickly

Press-fit phone holder

with charging port

Additional Projects

DIY Wine Bottle Cutter

Nicaraguan Stove Design

Cheese and Cracker Board

ryanjliu@gmail.com

925-285-7586