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Vinh BuiDesign Portfolio

B.S./M.S. Mechanical EngineeringStanford University

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Table of ContentsAbout Me .................................................................................................... 3Wa!e Block ................................................................................................ 4SAP Engage ................................................................................................ 6Hawaiian Minion P.Bot ............................................................................. 8Banked Turns Model ............................................................................... 10RENT3D ................................................................................................... 12SumoBot ................................................................................................... 14Pluntz ........................................................................................................ 16"e Clutch ................................................................................................ 18Mechanical Sloth ...................................................................................... 20"e CapCase ............................................................................................. 22Project Rampage ...................................................................................... 24

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About MeI want to pursue innovation and the discovery of technologies for a sustainable future in transportation. And in that pursuit, ensure that society and the environment are the ultimate bene#ciaries.

As a graduate from Stanford University, I have developed a strong engineering background coupled with an interest in en-trepreneurship and drive for innovation. I am a methodical de-signer, detail-oriented engineer and organized worker. I de-sign for the best blend of aesthetic form and functionality. I am eager to learn, try, fail, and repeat until I achieve my goal.

My work experience has primarily been in product design and man-ufacturing, and I hope to develop further experience in those areas. "is portfolio is a showcase of my school projects and an illustra-tion of my expertise as a mechanical design engineer. Please enjoy!

- Vinh Bui -

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Wa!e BlockME 318: Computer-Aided Machining, April - June 2015

Project Description: Wa!e Block is a stove top wa!e iron that makes a 6x6 grid wa!e that can be separated into various block shapes and stacked on top of each other. "is project was part of a creative design course where we learned to use a CNC machine.

Cross section of wa!e grid pattern Material comparison chart (pyramid on top with matching cavity on bottom for stacking)

Design Process: Before starting my design, I ordered a Belgian wa!e from a local diner and vistied Target to look at a Belgian wa!e iron and measure dimensions for all the critical features. I used these measurements as a starting point to design my wa!e block pattern, which emulates the block shape of LEGOs. I then researched online about common wa!e iron and cookware mate-rials. "e most common cookware materials were stainless steel, cast iron, and aluminum. Aluminum became the obvious choice material to machine, primarily because of its even heat distribution, machinability, and hard anodization capability for a non-stick and food safe surface. I chose components for the hinges and handle made from stainless steel for its strength, corrosion resistance, and lower thermal conductivity so that the heat would remain primarily in the aluminum.

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Wa!e BlockWhen machining, I chose to #xture my stock using the internal holes in my design for the hinges and handle, allowing me to buy a smaller piece of stock that I could just machine the exterior to size. I used the two inner hinge holes to be pin holes for alignment, and the rest of the holes to fasten the stock down into the #xture plate I was using. A$er machining, I sanded the back side of each half and glass bead blasted the entire thing to create an even surface and satin #nish ready for anodizing. "e handles were dipped in Plasti Dip for thermal insulation so the user’s hand would not get hot.

Project Results: Wa!e Block now makes food fun with building blocks for breakfast!

The  Ultimate  Support  Experience

10-­‐point  touch  monitor  

provides  interface  for  

sharing.

mimics  in-­‐person  

support  scenarios.  

user’s  focus.

Matched  desk  projection  

6DESIGN  TEAM Vinicius  Serra  Vinh  Bui   Kevin  Burke

Background

Solution

CUSTOMER SUPPORTHELP!

Request  goe

s  into  queue

 for  

customer  in  th

e  dark.

 <<This  impersonal  system  repeats,  leading  to    and  customer  frustration.  <<

customer  and  support.

Current  Process

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route  them  to  the  correct  

product  team  for  

processing.

communication  and  

customer  and  

customer  support.

CORPORATE  LIASONS  Katharina  Rock   TEAM  COACH  

freeing  them  from  having  to  contact  support.

ONE

TWO:  Contact  Support

Stanford

THREE:  Open  Communication

FOUR:  Support  Workstation

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Hawaiian Minion P.BotME 310: Product-Based Engr Design, Innovation, and Development, September - October 2013

Project Description: "e objective was to design a paper robot that could sense an input state, express an output state, and com-municate with other P.Bots using serial communication. "e P.Bot had to express four emotions: happy, sad, excited, and angry.

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Hawaiian Minion P.BotDesign Process: Inspired by the Minion characters from the movie Despicable Me, my team built our robot as a Hawaiian-themed Minion. "e body was constructed primarily of a cardboard cylinder body, pvc pipe arms and paper mache head. As inputs for each emotion, we simply used push buttons in di%erent areas of the body. We used two motors and wheels for movement and a motor to actuate the hula. We also connected red and blue LEDs for the eyes and a fan to blow tissue paper to simulate a torch. Everything was wired to a breadboard and controlled through an RBBB (Really Bare Bones Board).

Happy Mode Angry Mode

Project Results: Poking its side would make it happy and it would hula dance while its eyes &ashed blue. Holding its le$ hand would make it excited and it would hula dance while spinning in a circle. Turning o% its &aming torch would make it sad and its eyes would turn o%. Poking its eye would make it angry and it would chase the user with red &ashing eyes.

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Banked Turns ModelME 227: Vehicle Dynamics, April - June 2013

Project Description: My team and I investigated the e%ect of bank on a given path, modeled to simulate a NASCAR track.

Free Body Diagrams of forces acting on tire (le$), MATLAB model of Talladega Superspeedway (above)

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Banked Turns ModelDesign Process: We began by developing free body diagrams of vehicle tires, including components of centrifugal and gravitation-al forces. We derived equations of motion and implemented them along with other parameters such as the track path and curvature vectors into a MATLAB model. By varying bank angles and turn curvature on di%erent tracks and also modeling the Talladega Superspeedway, we determined the relationship between bank angle and maximum lateral acceleration and longitudinal velocity.

Project Results: Our model validated that bank angles substantially increase speed. "e centrifugal force e%ectively increases the normal force on the tires, thereby increasing their friction capabilities and lateral acceleration.

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RENT3DME 115C: Design & Business Factors, April - June 2013

Project Description: "e objective was to design a business around an idea, complete with an elevator pitch, revenue projections and assumptions.

Projection Tree for RENT3D Business Model

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RENT3DDesign Process: My team looked into the growing 3D printing market and created a business model for a rental service of 3D printers, ranging from small-scale DIY printers to industrial grade printers. As the technology continued to advance, we noticed machines were going obsolete within 6 months time, deterring companies from investing in such expensive equipment. Our model was subscription based where we earned revenue from an activation fee, monthly rentals, material sales, and sales of old machines.

Project Results: We developed a projection tree, 5 year revenue model and Pro#t & Loss analysis, and pitched the idea during a #nal presentation to our professors and industry professionals.

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SumoBotME 210: Introduction to Mechatronics, Jaunary - March 2013

Project Description: "e objective was to design an autonomous robot that could sense and push o% another robot from a raised platform (without falling itself) before a moving wall pushed either robot o%.

Initial frame design Motors and wheels Motor drivers

Design Process: Since the objective was to push, my team and I decided that high traction wheels and high torque motors were going to be signi#cant factors in the competition. Constrained by two 7.2 NiMH batteries and a total weight of 15 lbs, we selected four high torque motors, built our own motor drivers, and controlled everything through an Arduino UNO. We fabricated the frame out of laser cut duron, designing a concave edge for the front end to easily “catch” our opponent.

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SumoBot

Second frame design held motors more securely (above), Assembled SumoBot with all systems wired and integrated (right)

Project Results: We successfully sensed and pushed o% the Brick, a stationary robot with a beacon, during test runs. However, at the time of competition, it drove itself o% the platform and lost. We initially thought it was a so$ware issue, but soon realized the failure modes were thin wheels and incorrect matching of the wheel hubs and motor sha$.

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PluntzENGR145: Technology Entrepreneurship, January - April 2012

Project Description: "e objective of the project was to develop our own start-up idea into a viable business, complete with an elevator pitch, slide deck, and business model. As my team and I were all passionate about the electronic dance music (EDM) in-dustry, we developed a model to stream live music festivals for fans to view online.

Survey sent to 245 respondents Business Model

Design Process: EDM had become increasingly popular in the US and thus was a growing market. My team and I began by re-searching the current size and growth rate of the market and sent out a survey to validate our assumptions on user pain points. We concluded that although the number of large festivals were increasing, many individuals were deterred from attending because of high-priced tickets and the expense of travel. "erefore, we created an online platform for EDM fans to virtually take part in

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Pluntzor relive their festival experiences. We interviewed and pitched our idea to a number of industry professionals, including event promoters, artist managers, and club promoters. We created a business model with projections, a sales and marketing strategy, and a risk analysis. We developed a Minimum Viable Product (MVP), receiving 820 unique visitors and over 3,000 page views in less than a week.

Minimum Viable Product Google Analytics a$er 1 week

Project Results: A$er 3 months on the project, we applied to a number of incubators and accelerators, including Y Combinator and StartX. We were also given a seed o%er of $10,000 from our project advisor, a partner at DN Capital. Unfortunately, however, we soon realized our idea could not compete against YouTube and other large websites who began to stream events and ended the project.

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"e ClutchME 113: Mechanical Engineering Design, April - June 2011

Project Description: Sponsored by the PC Client Solutions Division (PCSD) of Intel Corporation, my team and I were tasked with developing the mechanical design for the next generation convertible tablet. We were to focus on the mechanisms for transforma-tion, primarily the keyboard movement and transition between tablet and notebook modes.

Rapid prototype (above), Sliding mechanism (below) Battery case slides magnetically against steel sheet

Design Process: We began by benchmarking current designs available on the market, paying close attention to the user experience associated with each mechanism. A$er prototyping a number of wild designs, we developed a #nal design fabricated primarily from laser cut black acrylic and a sheet of steel embedded behind the screen.

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"e Clutch

Consumption Mode Entertainment Mode

Quick-Type Mode Productivity Mode

Project Results: Our design featured the two common modes of convertible tablets. Consumption mode (tablet mode) was the default setting with just the tablet screen showing, and the user could enter productivity mode (notebook mode) by sliding the bot-tom battery piece up, which was connected by magnets, along the sheet of steel to angle the screen and then slide out the keyboard. We added two additional modes to the design as a competitive advantage. While in consumption mode, the user could slide out the keyboard and enter quick-type mode, or instead, could slide the screen up and enter entertainment mode for video viewing.

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Mechanical SlothME 112: Mechanical Systems Design, January - March 2011

Project Description: "e objective of the project was to design a mechanical robot that moved like a sloth along a tree branch.

Final 6-bar linkage design and path pro#le Motor, gear, and battery assembly

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Mechanical SlothDesign Process: We developed our design using concepts such as 4-bar linkages, motor and gearbox systems, and power and torque. We #rst designed a 4-bar linkage that traced the same path as a sloth’s limb through a lego prototype. We then selected an appropriate motor and gearbox to output our calculated power and torque requirements. A$er a series of tests with a prototype consisting of four separate 4-bar linkages, we iterated to a two 6-bar linkage system, which reduced the number of moving parts.

Final design of Mechanical Sloth

Project Results: Our #nal design was fabricated out of laser cut duron and tested on a horizontal rope. "e Mechanical Sloth had to make it from one end to the next within a time representative of a “sloth’s speed,” and did so successfully. "e working design can be viewed here: http://vimeo.com/20986660

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"e CapCaseME 203: Design and Manufacturing, September - December 2010

Project Description: As this was an introductory course into manufacturing, we could design anything provided it was primarily manufactured from metals and/or plastics. I wanted to design something that I knew I could use. "us, as I collected #tted hats, I wanted to create something to showcase my collection of hats.

Drilling holes for rivets Cutting shelf (above), Riveting (below) SolidWorks 3D Model

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"e CapCaseDesign Process: As opposed to hat display products that were already on the market, I wanted to design a product that could store and display hats in an eye-catching manner. My inspiration for the design came from strong structures like aircra$ and tank frames. "e entire structure was built from cut and bent sheets of 1/16” 5052 aluminum sheet metal. "e sheet metal was sand blasted and then anodized black and blue. Stainless steel rivets were used to fasten the entire case together.

Front view of #nal design with hats Rear view of #nal design

Project Results: "e CapCase was successfully assembled and showcased as a sleek storage and display case for hats. "e look of robustness made the CapCase stand out on its own. And coupled with my collection, it accentuated the bold designs of my hats.

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Project RampageME 101: Visual !inking, January - March 2010

Project Description: "e objective was to design a rube-goldberg machine consisting of two carts that were each timed to move a certain length and shoot a ping pong ball into the other cart. We were not allowed to use any metal, water, or chemicals, etc.

First cardboard prototype Movement trigger (above), catapult (below)

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Project RampageDesign Process: My team and I began by brainstorming an exhaustive list of mechanisms for timing, moving the carts, and propel-ling the ball. We built a number of prototypes for each individual mechanism and integrated the best ones in our #rst full prototype made out of cardboard. Following trial runs, we iterated on some concepts until the full cart worked successfully. We then began construction of the #nal design out of foamcore.

Movement mechanism Cart B with catcher Final Design: Cart A (le$) and Cart B (right)

Project Results: Within two weeks, we were able to prototype and test a number of ideas, eventually developing a robust design that performed perfectly. "e full working design can be viewed here: http://youtu.be/mK4r3--bChU