bavadikian_workportfolio
TRANSCRIPT
Experience and Work Portfolio
Brian Avadikian ([email protected])
January 1, 2015
Under the Guidance of EWB Faculty AdvisorsAlfred Gessow Rotorcraft Center Graduate Students
Undergraduate Research Assistant, Department of Mechanical Engineering, University of Maryland, College Park, MD
Undergraduate Research Assistant, EngineerdsWithout Borders, University of Maryland, College Park, MDUndergraduate Research Assistant, Alfred Gessor Rotorcraft Center, University of Maryland, College Park, MD,
About Me • 1st year Senior Mechanical Engineering Student at UMD.
• My passion for engineering spans into my personal life in many ways.
• I am driven to use my engineering skillset to overcome longstanding limits and challenges
• I am interested in gaining experiences that will diversify and build my skillset as well as challenge my critical thinking and problem solving ability.
• I have a strong sense for the physicality of systems, and hope to strengthen my understanding and ability to quantify and communicate systems properties
• This presentation is intended to describe some of the interesting projects I have worked on as well as my contribution to them.
Outline
– Carroll Community College– LEGO NXT Programmable Rover
– Alfred Gessow Rotorcraft Center:– Human Powered Helicopter– Micro Air Vehicle Research Assistant
– Engineers Without Borders:– Peru Team– Executive Board
– PETtone: Personalized Electronic Training
– Analytical Work Sample• Power Loss as a result of eddy current formation
Carroll Community College
Fig. 2 Rover Gate Arm
LEGO NXT Vehicular RoverTeam LeadThe objective of the project was to transport a pile of miscellaneous materials from one location to another. The rover began in a search pattern ignoring the track with the front gate open. When materials were sensed the gate closed and it navigated using the black tracks
• Designed an attachable plow system
with retractable front gate to retain
material
• Chose a maneuverable 3 wheel system
• Managed team schedule and project
progress
Block/ Visual Programming to Control
• 2 IR sensors• 1 Proximity Sensor• 3 Motors
• 2 Fixed wheel• 1 Front Gate
Fig. 1 Rover
Alfred Gessow Rotorcraft Center
Fig. 4 Rotor Blade
Human Powered Helicopter Research Assistant
• Contributed to two overnight rebuilds of the HPH Carbon Fiber Structure
• Extensive work with quick setting epoxy
• Practiced weight saving techniques • Vacuum Bagging• Quick Release and fabric
wrap• Construction of composite
leading edge blades
• MTS Machine string strength testing • Designed and Fabricated
string holding mechanism
Fig. 3 MTS Machine
Alfred Gessow Rotorcraft Center
• CATIA design work
• Assembly of Rapid Prototyped Blades
• Fabrication of Heat Activated Carbon Fiber rotor shroud
• Design of a general rotor hub and blades
– This decreased the time spent prototyping blades and made the angle of attack & blade number easily adjusted via set-screw
Micro Air Vehicle Research Assistant
Fig. 5 Blades and Hub (CATIA)
Engineers Without Borders
Peru Team Executive Board
• Collaboration on design documentation
• Team Leader for Chlorine Doser
• Construction As-Built CAD Drawings
Quartermaster• Travel Team Tool
Outfitting• Team Safety
Training Organizer• Chapter Grounds
Manager
Events Chair• Engineering
ExPO• Chapter events
Organizer• Fundraising
Collaboration
• Chlorine Doser Construction Team Lead– Submitted for EWB National Review
• Authored “as-built” drawings after careful review of implementation pictures
• Led the construction of a functional model of the doser on campus (featured below)
Engineers Without Borders
Fig. 6 As Built CAD representation
Fig. 7 Peru System in Country
Peru Team
Engineers Without BordersPeru Team
Fig. 8 Top System View
Engineers Without BordersMaryland-Day Demonstration Design LeadHuman Hamster Wheel
• Designed in CATIA• All materials sourced for under
$500• Partnership with Home Depot
was established as a donation to EWB
Slow Sand Filter
• Designed on paper (Due to simple design & time constraint)• Intended to illustrate a slow sand
filtration process and engage the public
Construction was not approved due to UMD safety regulations
Fig. 10 Slow Sand FilterFig. 9 Running Wheel
8 caster wheels to allow for wheel rotation.(Modeled after roller coaster tracks)
4 caster wheels to constrain the system vertically & horizontally
4 caster wheels to keep it centered on the vertical set of casters
• Personal Interest project • 1 complete prototype• Design:
– 1 Ultrasonic Range Finder– 1 Push Button– 1 LED– 1 Potentiometer– 1 Bell– 1 ArduinoWhen the pet sets off the proximity sensor, a bell is sounds and the unit is set into “wait” mode. The length of the wait is set via the potentiometer, and can only be adjusted after the button is activated. (this is to protect against accidental changes in the wait time value)
PETtone: Personalized Electronic Training
• 5 complete prototypes (Testing)
• Design:– 1 Ultrasonic Range Finder– 1 Push Button– 3 LED– 1 linear or Wheel
Potentiometer– 1 Bell– 1 ATmega328 IC ChipThe value in removing the Arduino from the system is that it is expensive and bulky. The ATmega328 can be used in it’s place at a fraction of the necessary space
Current Design/ Prototype
Next Steps
Reasons for Developing PETtone
• Familiarization with:1. Product process2. Manufacturing3. Design4. Fabrication techniques5. Arduino
• Decrease the number of accidents in residence
• Increase the confidence and mental capacity of the pet
• Decrease stress of owners • Open a clear line of communication between
pet and owner
Fig. 13 Prototype Front End
Fig. 12 Prototype Wiring
Fig. 11 PetTone Face PlateFig. 11 Arduino Microcontroller
CreoParametric to Laser Cutter
Steps to producing 2D Laser-Cut Products
– Design parts in any CAD system– Create a drawing of the parts created (no annotations or drawing layouts visible)– Save the drawing with a PDF extension
The document is then “Printed” Using the Microsoft XLS printer.
The sketches are maintained by the lasers cutting software & are represented as levels which can be given individual parameters for the cut.
1. Speed2. Power Level3. Number of Passes
Fig. 14 Laser Cutting Machine
Fig. 15 Close-Up Face Plate
Last semester as a final project for product development, UMD had us do a redesign of a sub assembly of the Dw-272 nail driver. In order to improve the tool, many teams redesigned the ergonomics, over-all size, and motor coil windings.
Our team was challenged by the instructor to asses the impact of eddy current losses in the tool during operations. Because of the nature of alternating current and universal brushed motors, there are motor core losses. To reduce these our team assessed two main things:1. The thickness of the motor lamination2. The Steel GradeI took the liberty of contacting DeWalts actual steel supplier to get a list of the steel types to compare, but they were too slow with their respose. Another catalog was sourced, and 8 steel types were compared across 3 gages and grades.
This work is featured as a MATLAB produced live PDF file, Titled: DrillBits WorkBook
Analytical Work Sample
