Qingyi Liu Portfolio

My name is Qingyi Liu. I am a Mechanical Engineering student at Stanford University, pursuing my Masters Degree. This portfolio is a showcase of some school and personalprojects I did. Feel free to email me [email protected]

The Ninja Batman

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a batman training game system for two players [fall 2012]

For the final project of a Mechatronic core program (ME218),each team is given the promt “to design a Batman traning system for two players”. Our team designed and manufactured the Ninja Batman game system, which was inspired by the idea that Batman must be a multi-task expert. He needs to be trained how to fight with bad people while he is driving his Batmobile. With the Ninja Batman training system, Batman is in a race against Joker, the one who gets to the finishing line wins it all. It's a race where users can punch their opponents and knock them out to get ahead, fighting while driving, multitask - ninja style. And the rules are: there are no rules!

Design Statement

Design MethodologyGenerate and compare different design concepts. Make rapid prototypes to verity the design concepts

Design the system architecture and decompose the whole system into serval State Machine modules

Assemble the modules and integrate software control algorithm with hardware

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The Ninja Batmana batman training game system for two players [fall 2012]

The Ninja Batman system is driven by two Freescale MC9s12c32 micro-controllers, involves working with sensors, driving actuators, designing event driven software and implementing that software in embeded C. Most parts of the system were manufactured in Stanford machine shop.

Design Details Responsibility

The system was finiahed in 2 weeks. Final version performed very well during the public presentation and players enjoyed the game very much!

In a team of 3, my contribution and responsibility includes • The original idea of “Multi-task” game system• Aesthetics design• Detailed mechanical design and manufacturing• Designing the shift register and servo circuit • Developed State Machine for shift register module and servo module in embeded C

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The goal of this project is to calibrate a Linear DisplancementTransducer (LDT) designed by previous student that is used to measure the spindle deviation of Victor Lathe in Stanford Product Realization Lab (PRL).

Design Problem

Design Process

LDT Calibrationprecision engineering project [spring 2012]

Compare approach candidates and Select appropriate one for system calibration

Design and Manufacture calibration apparatus

Set up calibration test and Collect data

Measure sprindle deviation of lathe with calibrated LDT

Analyze collected data and Create error compensation fomular

1

2

3

4

5

Repeatability

Design MatrixCandidates

Travel range

Hysteresis

CTE

Diffusivity

Cost

Manufacturability

High

<1mm

No

20microstrain/K

Aluminum(high)

~$1000

Wire EDM One pieceTime consuming

Low

Flexure Linear slide

0.5inCrossed-rollerbearing

17microstrain/KStainless Steel+Aluminum

~$500

Attributes

Machining in PRL Several parts

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To have a high resolution and repeatability, our team chose Laser Interformater for calibration. By manufacturing an adapter, a micrometer was able to be mounted on a linear slide that moves the retroreflector of interferometer and probe of LDT with the same displacement. We set the reading from the interferometer as reference and calibrated the data that was collected through a Labview-based software. Scale factor, resolution and repeatability were calculated saperately for forward and backward moving. An Error compensation formular was created by 5 degree polynomial fit. Lathe spindle axis deviation was measured by reserval with the calibrated LDT.

Design Details

ResponsibilityIn a team of 3, my contribution and responsibility includes:• Approach selection• Apparauts design and manufacturing

LDT Calibrationprecision engineering project [spring 2012]

MEASURE(LVDT)

WORK PIECE

CUT

Z-AXIS WAYS

DIAMOND TOOL

LASER SOURCE

MICROMETER

RETROREFLECTOR

CCD CAREMA

FLEXURE

PROBE

LDT

LASERSOURCERETROREFLECTOR

DOWELPIN

LINEAR SLIDE

LINEAR SLIDE BASE

REVESAL MEASUREMENT INTERFORMETER CALIBRATION METROLOGY LOOP

The Nib

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next-generation e-notebook, inspired by field researchers[2011-2012]

“Why so many people still use paper notebook?” Noticing that the ubiquity of paper notebooks in a digital age poses a significant product opportunity, SAP, the market leader in enterprise application software, approached our team to explore the design space. During the year-long class, as a global team, we designed a next-generation notebook with the prompt given by SAP and delivered a functional proof-of-concept prototype -- Nib.

Design Challenge

Design ProcessPROBLEM DEFINING UNDERSTANDING OPPORTUNITY FINDING PROTOTYPING

TESTING BUILDINGITERATING PRESENTING

The Nib

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next-generation e-notebook, inspired by field researchers [2011-2012]

Design Solution

A modern notebook for the digital age, inspired by field researchers.The love of a notebook. The power of a tablet.

a notebook-inspireduser interface

a seamless transitionfrom field to workplace

writing experiencea beautiful

The Nib is a modern notebook for a digital age, combining the power of digital with the feel of paper. Part of an integrated workplace network, it is your physical gateway to your information at any time. The Nib is a notebook to replace notebooks.

Electromagnetic Resonance (EMR) technology screen for precise, immediate visual feedback.

Search-by-drawing capability.

paperfeel

precisionwriting

pressuresensitivity

Instant handwriting-to-text conversion.

Integrated into your workplace for instant data syncing.

Paired with presence-aware tablet stands for access to your work with just a tap, whether it be from a personal computer or shared collaborative space.

A seamless transformation of recorded information into usable data.

Designed for serious pen control and a paper-like feel.

colorstylefont

Pen

EditSave

Inse

rt

Sketches Site 11 To-Dos Expenses Wetlands Site 12 Meetings

May Fieldwork Site B 2:42 PMPage 2 of 12

ICRconversion

The Nib

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next-generation e-notebook, inspired by field researchers [2011-2012]

Final Prototype

Components:Looklike model stylus omnipresent station with RFID notebook pad with clickable buttons

Worklike model stylus Wacom tablet Tablet housing with functional buttons

Manufacturing methods: 3D Printing Laser Cutting Waterjet Cutting Sandblasting

The Nibnext-generation e-notebook, inspired by field researchers [2011-2012]

Responsibility ResultsIn a global team consisting of 4 Stanford students and 4 students from univeristy in China, my contribution and responsibility includes:• Conducted user-oriented interviews and behavioral observations• Analyzed the current market to find opportunity of new technology• Designed Software workflow and interface mockup• Built and conducted usability testing of the prototypes, including the 3D drawing IR Whiteboard pen, Wacom housing, notepad frame • Managed the project budget (~$10000), built BOM for final prototype • Coordinated internal and external teammates oversea

• The project was successfully completed from scratch in 9 month • Positive feedbacks from people of different professions during the public presentation• A personal presentation was given to SAP CTO and our product was regarded as “an inspiring solution”

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Other ProjectsA car cup-holder desigend for General Motor, 3D model was created in NX

Fuwa-2008 Beijing Olympics mascot modeled in NX and manufactured by CNC milling machine

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Other ProjectsEvaluated and optimized newly designed water bottle for Kroger Co. by using FEA and FEM in Ansys

A human-carrying vehicel made by cardboard for Stanford ME Design Students’ PaperBike Rally

A mug with Canon DSLR handle,3D model was made in Solidworks

Top Load Analysis: Loads Top Load Analysis: Mesh (FLUID80)

Elements: 132,160Nodes: 135,216

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