Sustainable (Backpack) NIMS Interns: Dor Yisrael Ashur (UCSD) Aerospace Engineer Olmo Fabian Maldonado Gomez (UTSA) Electrical Engineer Week 5: WPM, Overview,

Sustainable (Backpack) NIMS

Interns:Dor Yisrael Ashur

(UCSD) Aerospace Engineer

Olmo Fabian Maldonado Gomez(UTSA) Electrical Engineer

Week 5: WPM, Overview, Components …oh my!

Mentors:Laura Balzano

(UCLA) Electrical Engineer

Diane Budzik(UCLA) Electrical Engineer


Project Overview

• Solid Boom to transport a shuttle 50 feet across a river/lake/valley…

• Whole assembly must fit in 2 backpacks and weigh below 100 lbs

• The system must be assembled quickly and easily by 2 people

• The system is designed to be used in rugged terrain, affordable, and fool proof.


Weekly Progress

• Completed:– Design of the System– Tripod, Shuttle, and Beam Housing Purchased– Boom selected– Support Tower designed– Base designed and Work Ordered

• Ongoing:– Boom machining (due Monday or Tuesday)– Guiding System– Anchors / Support Points


To Do

• Tripod– Tripod to Bottom Plate

connection

• Multiples– Cable connections

• Base– Assembly

• Shuttle– Design

• Tail– Guidance System

– Cranking Mechanism

• Anchors– Define multiple environment

and connections

– Define how many minimum connections and where

• Cables– Multiples or Single

– Strength and Material Choice

– Connection and Stringing

– Stringing Assembly

Legend: Olmo • Dor • Combination • Undefined


Calendar

July – August 2006

Sunday Monday Tuesday Wednesday Thursday Friday Saturday

23 24 25 26 27 28 29

- WMM

- Work Order: Beams

- Tripod

- Work Order:

Base

- Base / Multiples

Completed

30 31 1 2 3 4 5

- Assembly of Primary

Structure

- Tower / Tail Completed

- Work Order: Tower / Tail

- Cable /

Anchors

Completed

- WMM

- Work Order and Purchase

Order Finalization

- Assembly - Assembly / Experimentation

6 7 8 9 10 11 12

- Assembly / Experimentation

- Assembly / Experimentation

WMM

13 14 15 16 17 18 19

Weekly

Mentor

Meeting


Three Boom Piece Options

– Uneven I-Beam (5/8” x ½” x 1 ¼” x 1/16”)• Advantages:

– Reduced weight– More room for the shuttle to straddle– Easy stringing

• Disadvantage:– Thin web bends under torque

– T-Beam ( 1” x 1” x 1/8” )• Advantages

– Easy stringing• Disadvantages:

– Harder connection of multiples– Pipe ( O.D. 75” x Thickness 1/8” )

• Advantages:– Least weight– Easier multiple connection– Wire can be run through the middle in case of

a multiple failing• Disadvantages

– Hard to string


Boom Piece Connection Options

Uneven I-Beam

T-Beam

Pipe / Cylindrical


Final Boom Piece Configuration

Size:

24 pieces, 2 ft long, ¾” OD

- We chose this pipe to accommodate for the shuttle sizes available, to cables inside, and to be able to fit in a backpack

Connection:

- The head of each bar will snap into the tail of the next bar


Tripod

Manfrotto – Avenger A-128 Ultra Low Boy Stand

Max Height: 29 inMax Load : 66 lbMin Height: 19 inFolded Height: 22.8 inWeight: 8.2 lbColumn Tube Diameter: 35, 30 mmPrice: $152

We chose this tripod for its price and because it can fit in a backpack

We should have this tripod soon !!!!


Base (Boom Assembly Housing)

Ball BearingsEach of the multiple pieces will be slid through the base when assembling the boom

Although it may be more expensive, we will buy the housing now, rather that spending time to design and build a new one

Tripod

Base

Boom

Pillow Block

Cable Support


Shuttle

The shuttle is made of the same material as the base, but is smaller

The aluminum housing makes customization of the shuttle and base easy


Shuttle Movement

Designing a simple method to transport the shuttle from one end of the boom to the other

Two Cranks (Green): One to move the shuttle, and one to move the node

The inner wheel (brown) has a circumference of 1ft, allowing one turn of the handle to move the shuttle/node 1ft

We are currently finding out how best to string this all together


Base Rotation

• Constraints and Goals– Small enough to fit

in backpack– Should not deform

under its load– Angle should be

measured and readable

• Rotation Options:A) Hand rotated

B) Gear rotated

A

B


Base Rotation cont’d

• Gear Rotated– Advantages:

• Precise

• Hand crank mechanical advantate

– Disadvantages:

• More moving parts

• Assembly required in fabrication

• More susceptible wear and tear

• Heavier

• Hand Rotated– Advantages:

• Easy to make

• Easy to adjust

– Disadvantages:

• Less precise


Questions?

TO ASK QUESTIONS!TO ASK QUESTIONS!

Documents

Sustainable (Backpack) NIMS Interns: Dor Yisrael Ashur (UCSD) Aerospace Engineer Olmo Fabian Maldonado Gomez (UTSA) Electrical Engineer Week 5: WPM, Overview,