SAND SAMPLING APPARATUS

Gina TeofilakRichard KlimasDan MortensenRuben De Sousa

Overview

Introduction

Design Concept- take one

Experimental Changes

Design Concept- take two

Cost Analysis Comparisons

Current Design

Planned Future Work

IntroductionPurpose: Eglin AFRL has an existing experiment in which a projectile is fired through a coffin-sized box filled with 1100lbs of sand. Once complete, researchers are interested in the crystalline structure of the sand particles. The shot line of the projectile is approximately 1ft under compacted sand that must be removed in order to be examined. Current Designs require manual labor for filling and excavating samples of sand once projectile has been fired.

Problem: A request has been made to aid in the excavating process of the experiment. So far, removing the sample has proved to be a laborious “scooping” task with a simple shovel which may cause disruptions to the sand of interest. A more accurate technique is needed to exhume a sample.

Particle Analysis Excavated shot line

FracturedVirgin

v= 1200m/s = 3937 ft/s

DESIG

NDesign Concept – Take one Breakdown

Mount Aluminum Extrusion to side of target

Vacuum to desired depth

Use of Linear Actuators

Carbon Stick Tape

EGLIN

VISIT 10/31/2008Experimental Changes

Newly added forklift straddles

DESIG

N 2

Design Concept – Take two Breakdown

mechanism must be attached to top of target

vacuum to desired depth

Linear actuators will be designed

Carbon tape in circles

Cylinder to attach carbon tape

COST BREAKD

OW

NCost Analysis Comparisons

Item Cost

Vacuum $120

20ft 80/20 Aluminum Extrusion

$140

20ft -½ inch threaded rod $30

8ft- ½ “ x 1 ¼” aluminum $200

10ft - ¼ 20 aluminum rod $50

¼ 20 Socket head screws $20

Carbon Tape $60

(2) Linear Actuators $3000

(3) DC Motors $352.77

Total: $3627.20

Total: $979.97

DESIG

N TAKE TW

OCurrent Design

Use 3 linear motion actuators for X, Y, Z motion

½ inch threaded rod instead of lead screws for each axis of motion aluminum extrusion frames for Y and Z axes ½ inch aluminum rod stabilizers for support Motion to be attained from 3 high torque dc motors

Mounts to the side walls of the box for easy installation

Actuators

Y Actuator Motor will be mounted on side of shaft Able to move side to sideStabilizer bars add rigidness so actuator will not shake when torque is applied

Z Actuator Motor will be mounted on top of shaft Attached on the backside to the Y actuator Hose will be clamped to aluminum extrusion located on the mount

Numerical Modeling

DESIG

N TAKE TW

O

Motion Control

Motion control will be attained using 3 high torque DC motors

Y axis motion will be controlled with motion control stops every four inches

motion will start at one side of the box, right to left when the head reaches the left side of the box, it will hit the stop and return back to the right After returning to the right side, the X actuator will be moved four inches to next spot

• four inches is width of vacuum head

Z axis motion will occur after a whole top layer comes off the sand

will move down a pre set depth consistent every layer

DESIG

N TAKE TW

O

Side View Front ViewBottom View

Tip DesignD

ESIGN

TAKE TWO

Controlled depth Blades to breakup material

back pins Trial and error

FUTU

RE Future Plans – Fall semester

Design Components

Trip to Eglin to View Experiment

Redesign to accommodate sponsor

Run Experiment2nd trip to Eglin to shoot projectile

Prepare for Final PresentationIdentify all needed partsStatic analysis/weight distributionsOrder parts

Final Design

COST REFERENCESCarbon Stick tape http://www.2spi.com/catalog/spec_prep/cond_adhes-discs.shtml

Actuators

Aluminum Extrusion Dynatech Associates

Vacuum, screws http://www.homedepot.com

Aluminum, threaded Al, rod http://shop.bgmfg.com/

REFERENCES1. Cooper, William “Bill”, MSgt Wes Schuler, AFRL/RW

Munitions DirectorateAir Force Research Laboratory

2. Mortensen, Charles, Owner, Dynatech Associates