Joint Gun Effectiveness Model (JGEM)Joint Gun Effectiveness Model (JGEM)“Navy Accredited Minor/Medium Caliber Operational Tool”“Navy Accredited Minor/Medium Caliber Operational Tool”

The

Direct Fire

Analysis

Solution

Barbara HarrisGun Weapon Systems Branch (G32)

(540) 653-3251Barbara.j.harris1@navy.mil

Morris WalkerGun Weapon Systems Branch (G32)

(540) 653-5486Morris.d.walker@navy.mil

National Defense Industrial AssociationGun and Missile Systems Conference & Exhibition

March 27-30, 2006Sacramento Convention Center

Sacramento, CA

• Model Description • Model History• Methodology Overview• Input / Output• Future Enhancements (Air Bursting

Methodology, Graphics)

Outline

JGEM Description

PURPOSE:

– Predicts effectiveness for direct fire engagements– Analyze system sensitivities– Tool for system concept and trade studies

FEATURES:– Monte Carlo Simulation

– Models Direct Fire Engagements

– Adaptability to various Gun Weapon Systems

– Error Budget-based System Accuracy

– 3-D Target & Shooter Path (position data)

– Range Table Ballistics

– Single & Multiple Target Capability

– Statistical Output

– User-Friendly Graphical User Interface (GUI)

– JTCG/ME Accredited Model (Dec 2001)

Operational tool for direct fire evaluation of minor/medium caliber gun systems firing against single and multiple targets.

M&S Applications Hierarchy

Assessment

Training

Acquisition

EXER

CISE

SWAR

GAM

ES

TEST

S

Concept EvaluationForce Structure

System Assessments

DoctrineTactics

Proficiency

Requirements DevelopmentDesign & Development

Testing & Evaluation (T&E)

Analysis of Alternatives

System Familiarization

Original MGEMDeveloped by the Army Materiel Systems Analysis Activity (AMSAA) written to provide a computerizedmodel to quantify the advantages of developingnew air defense guns.

MGEM changes Made For 2000 Compliance with JWES 2.0 Requirements Document and Procedures for Acceptance ofSoftware by JTCG/ME.

JGEM, Re-engineered version Approved for Accreditation by JTCG/ME Dec. 2001

Verification Completed by UDLP.

Graphical Users Interface Started Documentation For Users Guide Completed.

20002000

19821982 1999199920012001

19931993

AMCGS/SWPS COEA Used modified version of MGEM for calculating gun system effectiveness

JGEM Development History

2001 2001 ––

20062006

Conduct SUW studies: Deep Water, LPD17, N76, LHAR, LCS

19841984

MGEM Released and studied the effectiveness of that classof air defense guns whose design was based on ModernControl Theory

Incorporate AirburstingMethodology

JGEM Methodology Overview

Structure

Systems

Warhead

Hit Distributions

ProbabilityTables

EquipmentDamage Lists

VulnerableSurface AreasCritical Standoff

Plots

Gunship Path

Gun Mount

Bullet Fly-out

Target Damage

Fire Control

Sensor

Engagement Loop

Target Path

JGEM Methodology

System: 30mm MK 46 MK 44 Mod 1 Gun (LPD 17 Class)

Reference(s)111

NM30 (Goalkeeper) 1

SENSORRange 2, 6Azimuth 2, 6Elevation 2, 6

GUN POINTINGAzimuth 3, 4, 5Elevation 3, 4, 5

AMMUNITION DATAMPI Rnd-Rnd

MK 266 HEI-T 5 3 7, 8MK 264 MPLD-T 5 3 7, 8MK 258 APFSDS-T 7.16 3.58 7, 8NM30 (Goalkeeper) 5.2 2.86 7, 8

Other JGEM Inputs Required:Fire Control Cycling Time: 4Track Settling Time: 4Magazine Capacity: 4Rate of Fire: 4Burst Size: 4Kill Assessment Time 4Target Acquisition Time 4

Range TableYesYesYes 1430

IV Error (m/s)

0.1 mils0.2 mils

2 meters

0.1 mils

Yes 1143

0.05 seconds

0.3 mils

Muzzle Velocity (m/s)

0.2 mils

1000MK 266 HEI-TMK 264 MPLD-TMK 258 APFSDS-T

1020

5 seconds

1 seconds 300 rounds

200 rpm5 rounds

5 seconds

0.5 mils 0.5 mils

5 meters

MPI

0.2 mils

Rnd-Rnd Error

Rnd-Rnd Error MPI

AMMUNITION

JGEM Input Error BudgetJGEM Input Error Budget

Round 1Round 2

Round 1Round 2

Target PathMoving Target Scenario

-500

-300

-100

100

300

500

0 1000 2000 3000 4000 5000 6000

Yards

Yar

ds

Firing Ship (10 kts) Target (25 kts)

JGEM InputJGEM InputTarget Path/Firing Ship PathTarget Path/Firing Ship Path

Range Vs Percent Hit

0

0.2

0.4

0.6

0.8

1

0 500 1000 1500 2000 2500 3000 3500

Range (meters)

Phit

Burst Number Vs Percent Killed

0

20

40

60

80

100

0 2 4 6 8 10 12

Burst Number

Pkill

Range Vs Percent Killed

0

20

40

60

80

100

0 500 1000 1500 2000 2500 3000 3500

Average Range Targets Killed

Pkill

• Range

• Burst

• Target

Open Fire Range: 4000 yards

Expected Number of Targets Killed:

5.26

JGEM Output

Evaluation of Air Burst Munitions -Methodology Overview

Target Damage

Direct Hit?Determine

Probability ofTarget Kill

No

Yes

Target Damage (Air Burst Munitions)

DetermineProjectile

Detonation PtDirect Hit?

DetermineProbability of

Target Kill(P k/b Matrices)

No

Yes

JMAE Probability of Kill Data

6.5 x 6.5 ft cellsDeflection = 40 cells wideRange = 80 cells long

Pkill > 0.75

Pkill > 0

Pkill > 0. 001

Pkill > 0.01

Pkill > 0.1

Pkill > 0.5

Sample Pk/b matrix

Detonation Point

Pkill, if target located at position “b” in relation to projectile detonation point.

Controlled Detonation MunitionsPre-formed pellets dispersed in a pre-determinedpattern prior to projectile impact on target

30mm AHEAD

Nylon DRB

WC 294Expelling Charge

Cargo Body

MK 432 Fuze

Base Plug(Modified with

Aluminum Plug)

Aluminum SpacersTo Reduce Weight

And Balance Projectile

13-Grain Tungsten AlloyShot Shell Pellets

(~9,000)Transfer

Cup

Nylon DRB

WC 294Expelling Charge

Cargo Body

MK 432 Fuze

Base Plug(Modified with

Aluminum Plug)

Aluminum SpacersTo Reduce Weight

And Balance Projectile

13-Grain Tungsten AlloyShot Shell Pellets

(~9,000)Transfer

Cup

5-Inch KE-ET

Kinetic Energy RoundsPre-formed spherical pellets expelled by low impulsedetonation charge and radial dispersion achieved viaprojectile spin momentum

AIR BURSTING MUNITIONS

5-Inch HE-ET, HE-CVT, HE-MFF

Future Air Burst Munitions Types

High Explosive RoundsBlast-fragmentation munitions which eject naturally forming shell casing fragments at high velocities

Methodology will allow accurate effectiveness assessments of all types of air bursting munitions.

Timed FuzesCVT FuzesET FuzesMulti-Function Fuzes with ET operating modes

Timing of detonation is varied via a standard deviation time error which has been determined from test data.

Proximity FuzesRF fuzesLaser fuzesIR FuzesMulti-Function Fuzes with proximity modes of operation

Fuze characterized in terms of cone angle and cone edge length.

FUZING IN JGEM

Animation of JGEM Engagements

3-D Animation using SIMDISWill allow display of JGEM engagement actions

o Firing ship movementso Threat boat movementso Projectile impacts and/or detonations

Allows extensive manipulation of developed images

NSWCDD fragmentation visualization toolProgram can be modified to display JGEM engagementactions

o Firing ship movementso Threat boat movementso Projectile impacts and/or detonations

Exploring use of other pre-existing visualization tools

Animation With SIMDIS