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

Sustainable (Backpack) NIMS 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.

Sustainable (Backpack) NIMS 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

Sustainable (Backpack) NIMS 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

Sustainable (Backpack) NIMS Calendar July – August 2006 SundayMondayTuesdayWednesdayThursdayFridaySaturday WMM - Work Order: Beams - Tripod - Work Order: Base - Base / Multiples Completed Assembly of Primary Structure - Tower / Tail Completed - Work Order: Tower / Tail - Cable / Anchors Completed - WMM - Work Order and Purchase Order Finalization - Assembly- Assembly / Experimentation Assembly / Experimentation WMM Weekly Mentor Meeting

Sustainable (Backpack) NIMS 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

Sustainable (Backpack) NIMS Boom Piece Connection Options Uneven I-Beam T-Beam Pipe / Cylindrical

Sustainable (Backpack) NIMS 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

Sustainable (Backpack) NIMS Tripod Manfrotto – Avenger A-128 Ultra Low Boy Stand Max Height: 29 in Max Load : 66 lb Min Height: 19 in Folded Height: 22.8 in Weight: 8.2 lb Column Tube Diameter: 35, 30 mm Price:$152 We chose this tripod for its price and because it can fit in a backpack We should have this tripod soon !!!!

Sustainable (Backpack) NIMS Base (Boom Assembly Housing) Ball Bearings Each 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

Sustainable (Backpack) NIMS 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

Sustainable (Backpack) NIMS 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

Sustainable (Backpack) NIMS 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

Sustainable (Backpack) NIMS 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

Sustainable (Backpack) NIMS Questions? TO ASK QUESTIONS!