Group 10 Anthony Muller Gerald Tyberghein Joshua Wood.

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Presentation transcript:

Group 10 Anthony Muller Gerald Tyberghein Joshua Wood

Overview Problem Statement Product Specifications Initial Concept Designs Final Design Pelican Case Finalized Parts List Mounting Simulation Hardware/Software Drop Testing Force and Static Analysis Results Improvements 2

Problem Statement Figure 1: Lockheed Martin TAGTS Source( Advanced Gunnery Trainer System simulates many military vehicle operations. We’re dealing with the M1 Abrams tank simulator. TAGTS requires assembly and breakdown every time it must be transported. Inconvenient to the user and takes time, and can get disorganized. Re-design system to make easier to assemble and transport. 3

Product Specifications System must weigh less than 120 lbs. System must satisfy 15 degree tip rule. Handle and monitor must be mounted in correct tactical position. Equipment must be safe while transported. Packaging does not interfere with cooling. 4

Initial Concepts Figure 2 : Tabletop Box on Floor Hybrid Concepts 5

Final Concept Figure 3: Front Internal View Figure 4:Rear Internal View 6

Our Case (14U case, 26” case) Figure 5: Pelican Case for our project Figure 6: Internal rear view of case 7

Our Case Figure 7: Side view Figure 8: Pressure Release Valve (Top) Shock Mount (Bottom) 8

The Handle Pivot Figure 9: Handle Pivot (Before/After) 9

The Bearing Blocks Figure 10: Bearing blocks Figure 11: Side internal view of bearing block 10

The Computer Shelf Figure 12: Computer Shelf 11

Finalized Parts List Table 1: Parts List (images from DescriptionQuantityTotal Price Aluminum square tubing1 (6ft)36.22 Aluminum bar for pivot1 (3ft)19.28 Bronze Sleeve Bearings49.96 Aluminum bearing blocks Locking pin13.41 L- brackets for pivot1 (4ft)10.98 Handle and monitor mount2 (3ft)64.28 U-bracket for handle Shelf material Neoprene tubing1 (1ft)2.00 Silicone dampening1 (2ft)10.32 Neoprene for aux. parts1 (2ft)43.62 Auxiliary brackets1 (3ft)36.65 Medium Density Fiberboard1 (4’x8’)32.96 Total$

Static Tip Analysis Figure 13 : Maximum Angle of Deployed System 13

Static Tip Analysis Tipping occurs when left normal force is equal to 0 and center of gravity passes the right normal force. Solving for this angle, theta=atan(8.62/8.3) = 46deg Product specification: Satisfy 15 degree tip rule 14

Risks Assessed Components may be damaged by impact forces or vibration. We analyzed impact forces from drop testing to analyze if our design completely satisfies the fragility bounds for the components. Given the results we know that there needs to be some tweaking in our design. Components and mounts may not assemble as desired in design We had to re-drill and cut down a lot of parts after being machined to fit our exact frame. 15

Risks Assessed Handle may swing into computer monitor L-bracket stop was implemented to prevent this. Once assembled, system could weigh more than expected We have room to cut down material, however our system did not weigh more than desired. Specific Pelican case model may not be available We were able to use another case that was available, modifying our design to suit the new dimensions. 16

Mounting the Components Figure 14: Front View Figure 15: Rear View 17

Mounting the Components Figure 17: Angled view of pivot bar and pins Figure 16: Side view of gunner handle 18

Handle and Touchscreen Demonstration Using gunner handle in correct position. Mount holds gunner and allows desired mobility. Touchscreen to input username and password, stays rigid when touched or handled. 19

Satisfying Transportation Safety : MIL-STD-810 Test “…a generally accepted standard of ruggedisation for testing and compliance for mobile computers and equipment.” (Secure Systems and Technologies) Mechanical Shock Random Mechanical Vibration Altitude Figure 18 : Vibration Test Source: Qualtest (

Drop Testing 6 drop tests conducted at Qualtest Inc. 21 Figure 19: Case hoisted for drop in Qualtest

Drop Testing Figure 20: Drops measured 30” from ground to impact point. Figure 21: Impact force measured using two tri-axial accelerometers on computer and monitor mockups 22

Drop Testing Drop test #1 on bottom of caseDrop test #2 on front corner 23

Force Analysis – Drop 1 Graphs of first drop test on bottom of case, acceleration vs. time in the z-axis. In the x and y axis, there was much smaller acceleration. There is a spike in the computer at about 59G, and in the monitor at about -54G. 24 Figure 22: Drop 1, computer, z-axisFigure 23: Drop 1, monitor, z-axis

Force Analysis – Drop 1 retake We redid the first drop in hopes of lower forces, however one of our screws sheared off and caused an even higher peak in the computer’s impact force of about 90G. The monitor did not see this spike. 25 Figure 24: Drop 1 retake, computer, z-axis

Force Analysis – Corner Drops Figure 25: All figures were the extreme cases from each drop. Titles depict graph 26

The Aftermath Figure 26: Handle after 2 front corner drops. Bent outward at 45 degree angle Figure 27: Handle after all 5 drops. Lost piece of mockup, handle mounts deflected, however back drops “corrected” bending a bit 27

The Aftermath Figure 28: Rivet-nut started to dig into computer mockup. Figure 29: Monitor endured all tests without problems. 28

Results 29 System weighed exactly 120 lbs. Some overshoot in impact force, but most peak forces were within the range of G. Computer and Monitor remained completely stationary throughout all drops. Design allows for thorough airflow and ease of access for any maintenance. Gunner handle moved during drops due to insufficient durability in handle mount.

30 Improvements Cut out less material in gunner handle mount Add in horizontal support in gunner handle Order case specific for our design Rubber grommets over rivet nuts to prevent any grinding Utilize Group 9’s handle for more simulations

Acknowledgements Sponsor – Lockheed Martin - Jeffrey Payne (Mechanical Engineer) Sponsor – Pelican Hardigg - Daria Boley (Pelican Hardigg Salesperson) Advisors – - Dr. Rob Hovsapian - Dr. Patrick Hollis - Dr. Srinivas Kosaraju - Ms. Shannon Ingersoll - Mr. Joseph Trpisovsky 31

References 32 Lockheed Martin. The Advanced Gunnery Trainer System (AGTS) Tabletop Trainer. Lockheed Martin. Web. 31 Oct Pelican. Pelican Hardigg Cases. Pelican, Web. 03 Nov Qualtest. Web. 10 Nov 2010 Secure Systems and Technologies. MIL-STD-810 Overview. Secure Systems and Technologies %20overview%20iss%205.pdf. Web. 31 Oct