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SAND SAMPLING APPARATUS Eglin Air Force Base Gina Teofilak Richard Klimas Dan Mortensen Ruben SAND SAMPLING APPARATUS Eglin Air Force Base Gina Teofilak Richard Klimas Dan Mortensen Ruben De Sousa

Sand Fracture Mechanisms During High-Speed Sand Impacts William “Bill” Cooper, MSgt Wes Schuler, LT Sand Fracture Mechanisms During High-Speed Sand Impacts William “Bill” Cooper, MSgt Wes Schuler, LT Brad Breaux, Lalit Chhabildas AFRL/RW Munitions Directorate Air Force Research Laboratory Phil Metzger Granular Mechanics & Surface Systems Lab NASA, Kennedy Space Center Victor Giurgiutiu Air Force Office of Scientific Research 2

Overview- The Experiment §Target filled with 3000 lbs. sand §Projectile shot through the target Overview- The Experiment §Target filled with 3000 lbs. sand §Projectile shot through the target §Documentation of virgin & impacted sand grain morphology 3

INTRODUCTION Introduction Projectile Target shot line Fractured sand 4 INTRODUCTION Introduction Projectile Target shot line Fractured sand 4

Current Design Y X Z §Driven by a chain §Steel rod with supports (x-axis) Current Design Y X Z §Driven by a chain §Steel rod with supports (x-axis) §Actuators with threaded rods (y & z axes) § 3 motors automated §Control system 5

EGLIN VISIT 10/31/2008 Current Design Cont’d. 6 EGLIN VISIT 10/31/2008 Current Design Cont’d. 6

Fabrication - CNC to fabricate end plates and bearing holders - Mill to construct Fabrication - CNC to fabricate end plates and bearing holders - Mill to construct side plates and lead screw nut - Lathe to turn down lead screws and support rods 7

Actuators - Y and Z actuators same concept, but different sizes - Same spacing Actuators - Y and Z actuators same concept, but different sizes - Same spacing between stabilizer rods and lead screw - Y actuator is 24 in x 8 in - Z actuator is 17 in x 8 in -Z actuator mounted vertically onto the horizontally mounted y actuator - Bearing holders and lead screw nut were precisely fabricated to prevent binding and torque forces 8

Remaining Fabrication §Two 8 ft rails with supports every 1 ft (x axis) §Various Remaining Fabrication §Two 8 ft rails with supports every 1 ft (x axis) §Various parts that attach the y actuator to x axis: § clamp for the chain § end supports that will house the pulleys for the chain §Group will be going down to Clearwater this weekend to fabricate these parts, and create a base to mount the apparatus for experimentation 9

Electronics- Old Method X Direction Movement Encoder Motor Controller – Servo Controller Motor Z Electronics- Old Method X Direction Movement Encoder Motor Controller – Servo Controller Motor Z Direction Movement Wall Socket Power Supply Microprocessor Encoder Y Direction Movement Encoder § Using encoders and servo controllers to do motion control § Became expensive - >$200 per motor Required Torque Needed (oz*in) X movement 20 Y movement 40 Z movement 20 10

Electronics- New Method X Direction Movement Switches Motor Controller Motor Z Direction Movement Wall Electronics- New Method X Direction Movement Switches Motor Controller Motor Z Direction Movement Wall Socket Power Supply Microprocessor Switches Y Direction Movement Switches § Using switches and hard coding to get motion control desired. § Cheaper but more time consuming. Cabling ran close to the mechanism in twisted pairs and attached away from moving parts. Electronics are being enclosed in a plastic enclosure for protection from the environments. 11

REFERENCES 1. Cooper, William “Bill”, MSgt Wes Schuler, AFRL/RW Munitions Directorate Air Force Research REFERENCES 1. Cooper, William “Bill”, MSgt Wes Schuler, AFRL/RW Munitions Directorate Air Force Research Laboratory 2. Mortensen, Charles, Owner, Dynatech Associates 3. Dr. Chiang Shih, FAMU-FSU College of Engineering, Mechanical 4. Dr. Daudi Waryoba, FAMU-FSU College of Engineering, Mechanical 12