University of the PacificUniversity of the Pacific 11

Parabolic Food Aid Parabolic Food Aid Delivery SystemDelivery System

Mishari Al-NahedhMishari Al-NahedhChia LeeChia LeeLisa MakLisa Mak

December 5, 2002 December 5, 2002

Engineering 5Engineering 5Section 6Section 6

University of the PacificUniversity of the PacificSchool of Engineering and Computer ScienceSchool of Engineering and Computer Science

3601 Pacific Ave. 3601 Pacific Ave. Stockton, CA 95211Stockton, CA 95211

Submitted To: Dr. SchultzSubmitted To: Dr. Schultz

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OverviewOverview

• Problem DefinitionProblem Definition

• Design ProcessDesign Process

• Discussion of ResultsDiscussion of Results

• Suggested ImprovementsSuggested Improvements

• ConclusionsConclusions

• AcknowledgementsAcknowledgements

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Problem DefinitionProblem Definition

Introduction / BackgroundIntroduction / Background

– Design and build a mobile parabolic food aid Design and build a mobile parabolic food aid delivery system (PFADS) for Camkur, Inc.delivery system (PFADS) for Camkur, Inc.

– Introduction to Engineering course team Introduction to Engineering course team projectproject

• Design ProcessDesign Process

• Effective Team Group workEffective Team Group work

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Problem Definition (cont.)Problem Definition (cont.)

– PFADS must carry food aid packages (FAP) PFADS must carry food aid packages (FAP) down a ramp and release it when it launches.down a ramp and release it when it launches.

– Competition for all engineering sections teamsCompetition for all engineering sections teams

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Problem Definition Problem Definition Continue…Continue…

ConstraintsConstraints– Food Aid Packages:Food Aid Packages:

•Size : 4-3/8 x 4-3/8 x 5-1/2 inchesSize : 4-3/8 x 4-3/8 x 5-1/2 inches

•Weight : Approx. 7 ounces (~200 g)Weight : Approx. 7 ounces (~200 g)

– Parabolic Food Aid Delivery System :Parabolic Food Aid Delivery System :

•Size : Maximum dimensions is 18 x 18 x 18 Size : Maximum dimensions is 18 x 18 x 18 inchesinches

•Weight : Maximum 10 PoundsWeight : Maximum 10 Pounds

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Problem Definition Problem Definition Continue…Continue…

• CriteriaCriteria– Weight: PFADS must weight light.Weight: PFADS must weight light.

– Volume: the smaller size, the better result.Volume: the smaller size, the better result.

– Time to prepare PFADS prior to its release: only Time to prepare PFADS prior to its release: only one minute.one minute.

– Easy to release, by simple touchEasy to release, by simple touch

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Project ObjectivesProject Objectives

• PFADS must:PFADS must:– Carry food aid package (FAP) down a 7 feet Carry food aid package (FAP) down a 7 feet

long ramp.long ramp.

– Launch the FAP over a 6’2” high wall after it Launch the FAP over a 6’2” high wall after it hits the bottom of the ramp.hits the bottom of the ramp.

– Deliver the FAP to a target, which is 6.5 ft. Deliver the FAP to a target, which is 6.5 ft. away from the wall.away from the wall.

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Project Objectives (cont.)Project Objectives (cont.)

• RampRamp

PYTHON-INFESTED JUNGLE BOUNDARY

4 in

4 ft 8 ft

STARTLINE

FAP TARGET

SPOT6 ft 2 in

3.5 ft

10 ft 10 ft

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Design ProcessDesign Process

• Preliminary IdeasPreliminary Ideas

– use springsuse springs

– use flexible (yet durable) plasticuse flexible (yet durable) plastic

– use rubber bandsuse rubber bands

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Design Process (cont.)Design Process (cont.)

• RefinementRefinement– Use springsUse springs

•much easier to obtainmuch easier to obtain

•more durable than othersmore durable than others

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Design Process (cont.)Design Process (cont.)

• Refinement (cont.)Refinement (cont.)– make launcher similar to catapultmake launcher similar to catapult

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Design Process (cont.)Design Process (cont.)

• Refinement (cont.)Refinement (cont.)– Make it similar to Make it similar to

Newton’s CradleNewton’s Cradle

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Design Process (cont.)Design Process (cont.)

• Refinement (cont.)Refinement (cont.)– make launcher similar to mouse-trapmake launcher similar to mouse-trap

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Design Process (Cont.)Design Process (Cont.)• DecisionDecision

– Make launcher similar to mousetrapMake launcher similar to mousetrap

– Simple designSimple design

– Easy to implementEasy to implement

• Use springs Use springs

– Use the recoil force of the springs when Use the recoil force of the springs when stretchedstretched

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Design Process (Cont.)Design Process (Cont.)• Construction & TestingConstruction & Testing

– Aluminum rod frame was attached to the piece of Aluminum rod frame was attached to the piece of woodwood

– Springs were then attached to the piece of wood Springs were then attached to the piece of wood and to the aluminum rodand to the aluminum rod

– Another piece of wood is added to the bottom of Another piece of wood is added to the bottom of the basethe base

– After several testing, to maximize the strength of After several testing, to maximize the strength of the PFADS, a 1 ft. high piece of wood was added in the PFADS, a 1 ft. high piece of wood was added in front to level off the FPAD while going down the front to level off the FPAD while going down the rampramp

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Figure 1 Figure 1 Testing of the PFADTesting of the PFAD

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Figure 2 Figure 2 Construction of the PFADConstruction of the PFAD

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Figure 3 Figure 3 The Design of the PFADThe Design of the PFAD

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Design Process Continue…Design Process Continue…

• Final MechanismFinal Mechanism– Dimensions: 2.5” x 14” x 12’’Dimensions: 2.5” x 14” x 12’’– Weight: 1 lb.Weight: 1 lb.

• Launch Mechanism reacts to force of hitting wallLaunch Mechanism reacts to force of hitting wall

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Final DesignFinal Design

Top Front Back

Side

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Discussion of ResultsDiscussion of Results

• Did not launch over the wallDid not launch over the wall

– The PFADS was too small/light weighted to The PFADS was too small/light weighted to exert much force on the FAPexert much force on the FAP

• The wheel axle came loose after the impact with The wheel axle came loose after the impact with the 4 in. wall at the bottom of the rampthe 4 in. wall at the bottom of the ramp

– This diminished our chance for launching This diminished our chance for launching during the 3rd trial (without the wall)during the 3rd trial (without the wall)

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Discussion of ResultsDiscussion of Results

• Final FOM is 55.83Final FOM is 55.83

• Ranked 21st place out of 36 teamRanked 21st place out of 36 team

• The most light weightThe most light weight

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Suggested ImprovementsSuggested Improvements

• Use compression force springs instead of recoil Use compression force springs instead of recoil springssprings

• Use thicker aluminum rod instead of aluminum Use thicker aluminum rod instead of aluminum rod usedrod used

• A heavier base to hold down the rod & springsA heavier base to hold down the rod & springs

• A stronger wheel anchor/axleA stronger wheel anchor/axle

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ConclusionsConclusions

• It was too light weighted to exert enough force to It was too light weighted to exert enough force to launch the FAP over the walllaunch the FAP over the wall

• Constant launching (testing) of the PFAPS Constant launching (testing) of the PFAPS weakens and bends the aluminum rod which weakens and bends the aluminum rod which defects the effects of the launchingdefects the effects of the launching

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AcknowledgementsAcknowledgements

• Mr. Cavan Carroll for his guidance and support Mr. Cavan Carroll for his guidance and support throughout the projectthroughout the project

• Mr. Andrew Walter for supplying certain materials Mr. Andrew Walter for supplying certain materials and for his supportand for his support