System Modeling of a 40mm Automatic Grenade …...C V C C d y m N X aero α θ α S ADx =S ADy =0. 4...

Defence Research andDevelopment Canada

Recherche et développementpour la défense Canada Canada

Using a 40mm Automatic Grenade Launcher as a Precision Weapon at Long Ranges

Dr. Daniel CorriveauFlight Mechanics Group / Precision Weapons Section

International Infantry & Joint Services SMALL ARMS SYSTEMS SymposiumMay 18-21, 2009

Defence R&D Canada • R & D pour la défense Canada

Presentation Overview

• Objective

• Background

• Aerodynamics of a 40 mm HV grenade

• Error budget development

• Long range firing trial and simulation dispersions

• Weapon system simulation results

• Conclusions

• Demonstrate the feasibility of using a 40mm AGL at long range for precision effects

• Develop an aerodynamics model for a generic 40 mmHV grenade

• Develop an error budget model for the MK19 AGL

• Drag/Mass error (%)• Round-to-round muzzle velocity error (m/s)• Gun dispersion (mils)• Ammunition dispersion (mils)

• Validate results with long range firings

Objective

Background

AOA=30°Ammo: mass, CP, CG, shape, aero

PRODASMET data

Round Characteristics at time of burst or detonation:

• Dispersion• Probability of hit• Remaining Speed• Remaining Spin• Angle of descent (AOD)• Time of Flight

Weapon System representation

Weapon system modeling

Ammo model developmentAeroballistic range trial

• Complete ammo aero model

ARFDAS - Aeroballistic Range Facility Data AnalysisS

Physical Properties

L M D I I I

I I Ix y z

xy xz yz

, , , , ,

Atmospheric Conditions

ρ µ, , ,P T

6DOF Dynamic Data

t x y z, , , , , ,φ θ ψ

ARFDASStartup

Linear TheoryAnalysis

6DOF Symmetricor

6DOF Asymmetric

Aerodynamic Forces & Moments vs.Mach No. & Angle of Attack & Roll Angle

C C C C C C C CC C C C C C C CC C C C C C CC C C C

Xo X X N N N Yp Yp

m m m mq mq np np np

n n nr nr n m n

, , , , , , , . . . . . . . ., , , , , , , . . . . . . . . . .

, , , , , , . . . . . . . . . . . . . ., , , . . . . . . . . . . . . . . . .

α α α α α α α

α α α α α α

β β α γα γα

α δ γαδ

2 4 3 5 3

3 5 2 3 5

3 2 3 3

Single &Multiple Fits

Fit Theoreticalto Experimental

Ammo model development

Wall View

Pit ViewShadow

Shadowgraphs

• Instrumented length: 220 m

• Section: 6 m x 6 m

• 54 Stations: Indirect orthogonal shadowgraphs

• 4 Schlieren stations

Ammo model developmentProjectile motion

Ammo model developmentAerodynamic model

Background

AOA=30°Ammo: mass, CP, CG, shape, aero

PRODASMET data

Round Characteristics at time of burst or detonation:

• Dispersion• Probability of hit• Remaining Speed• Remaining Spin• Angle of descent (AOD)• Time of Flight

Weapon System representation

Weapon system modeling

Error budget development

• Required as input to Prodas:• Estimated based on literature and user experience• Determined accurately through an accuracy trial

MODEL 40mm HV Errors Measured

Drag/Mass (%) VM – round to round (m/s) VM – lot to lot (m/s) Wind Std(m/s) Pressure Std (mbars) Air Temp (C) Std Dev Vert. Aiming Error (mils) Horz. Aiming Error (mils) Vert. Boresight alignment (mils) Horz. Boresight alignment (mils) Target range Error (m) Horz. Gun dispersion (mils) Vert. Gun dispersion (mils) Ammunition Dispersion (mils) Fuze Error (% of time)

Error budget development Total dispersion breakdown

2222ADxGDxDD SSSS

VxTOTALX++=

TotalObservedDispersion

AmmunitionDispersion

GunDispersion

Gravity Drop(VMUZ, mass, CX0)

2222ADyGDyDD SSSS

VyTOTALY++=

Error budget development Total dispersion

Precision trial:• NATO StanAg procedure• Firing at 300m• Tripod mounted MK19 on natural ground• T&E mechanism• Single-shot firing• Elevation and azimuth adjustedmanually prior to firing

milsSTOTALDX 93.0=

milsSTOTALDY 64.0=

Error budget development Ammunition dispersion (aerodynamic jump)

• Due Mainly to Initial Yaw Rate• In bore Balloting• CG Offset

• Theory States- If initial yaw rate, , is known- with aerodynamic packageand physical properties

- can calculate ammunition disp.

Error budget development

SHOT NUMBER

1st Max Yaw (deg)

B01 2.87 B02 1.55 B03 2.85 B04 2.90 B05 1.74 B06 2.71 B07 2.46 B08 2.10 B09 2.73 B10 1.31

Mean 2.323 STD. DEV. 0.601

Ammunition dispersion (aerodynamic jump)Angle of Attack – Extrapolated to Muzzle with A/B Range Data

( )max0 2

αφφ SFq −

−= 2

0 mdqI

VCdCC y

XNaero

milsSS ADyADx 4.0==

SHOT NUMBER

1st Max Yaw (deg)

B01 2.87 B02 1.55 B03 2.85 B04 2.90 B05 1.74 B06 2.71 B07 2.46 B08 2.10 B09 2.73 B10 1.31

Mean 2.323 STD. DEV. 0.601

Error budget development Muzzle velocity error

SHOT NUMBER VMUZ (m/s)

D01 243.5 D02 242.6 D03 245.1 D04 243.2 D05 243.8 D06 242.9 D07 242.6 D08 242.1 D09 243.4 D10 241.0

Mean 243.0

Std Deviation 1.1

• Measured for each individual round in precision trial at 300m• Determined using Radar measurements• Data processed using Radar2000

Error budget development Drag/Mass error

SHOT NUMBER Mass (gm)

D01 239.64 0.16120 D02 240.56 0.16028 D03 240.03 0.16167 D04 242.10 0.17356 D05 240.75 0.16238 D06 241.54 0.16434 D07 240.36 0.15635 D08 242.16 0.15558 D09 241.11 0.15850 D10 240.82 0.15936

Mean 241.26 0.154

Std Deviation 0.7336 0.002 Std Deviation (%) 0.30 1.30

• Variation in CX0 due to non-uniform band engraving

• Variation in mass due to quality control

0.1200 0 =−=

C X σσ

• Measured for each individual round in precision trial at 300m

Error budget development Gun dispersion: lateral analysis

0.93mils

2222ADxGDxDD SSSS

VxTOTALX++=

TotalObserved

GunDispersion

Gravity drop(VMUZ, mass, CX0)

0.00mils

0.84mils

0.40mils

Error budget development Gun dispersion: drop analysis

0.64mils

TotalObserved

GunDispersion

Gravity drop(VMUZ, mass, CX0)

0.35mils

0.40mils

2222ADyGDyDD SSSS

VyTOTALY++=

Error budget development Error budget model

MODEL 40mm HV Errors Measured

Drag/Mass (%) 1.0 VM – round to round (m/s) 1.1 VM – lot to lot (m/s) Wind Std(m/s) Pressure Std (mbars) Air Temp (C) Std Dev Vert. Aiming Error (mils) Horz. Aiming Error (mils) Vert. Boresight alignment (mils) Horz. Boresight alignment (mils) Target range Error (m) Horz. Gun dispersion (mils) 0.84 Vert. Gun dispersion (mils) 0.35 Ammunition Dispersion (mils) 0.40 Fuze Error (% of time)

Valid for:•Tripod mounted MK19 on natural ground• T&E mechanism• Single-shot firing

Scenario/Mission SimulationsFiring simulations at 1000m

Horz. Disp.: 0.94mils

Vert. Disp.: 1.22mils

Single shot Phit: 0.66

NATO side profile:2.3m x 4.6m

Scenario/Mission SimulationsFiring simulations at 1000m

Simulation:Horz. Disp.: 0.94milsVert. Disp.: 1.22mils

NATO side profile:2.3m x 4.6m

Experimental firing:Horz. Disp.: 1.05milsVert. Disp.: 1.11mils

Precision trial:• NATO StanAg procedure• Firing at 1000m• Tripod mounted MK19 on natural ground

• T&E mechanism• Single-shot firing• Weapon zeroed on target• Elevation and azimuth adjustedmanually prior to firing

FCS Performance EstimationsEffect of error on elevation (aiming error)

NATO side profile (2.3m x 4.6m) at 1000m

FCS Performance EstimationsEffect of error on wind (std. dev.)

NATO side profile (2.3m x 4.6m) at 1000m(Insert by Per Arvidsson, FMV)

FCS Performance EstimationsAdding the aiming error and the wind error...

• Baseline single-shot model prediction (no aiming or wind errors): Phit= 0.66

NATO side profile (2.3m x 4.6m) at 1000m

• Single-shot model prediction with aiming and wind errors: Phit= 0.12• Std. Dev. on wind: 2m/s• Elevation set using DMC with an accuracy of 0.15o

• 5 rounds burst model prediction with aiming and wind errors: Phit= 0.66• Std. Dev. on wind: 2m/s• Elevation set using DMC with and accuracy of 0.15o

(!!!Caution: model not developed for burst firing!!!)

Extrapolating...

Conclusions

• An experimentally developed error budget model was used to demonstrate the precision of a properly zeroed 40mm AGL at long ranges (~1000m)

• The simulation results at 1000m were validated with live firings

• Without a state-of-the-art FCS, the precision of the 40mm AGL would be limited in a real engagement scenario

» Aiming error» Wind error» Ballistic solution error

Contact Information:

Dr. Daniel CorriveauPhone: 418-844-4000 Ext. 4156

Defence R&D Canada – ValcartierE-mail: daniel.corriveau@drdc-rddc.gc.ca

System Modeling of a 40mm Automatic Grenade …...C V C C d y m N X aero α θ α S ADx =S ADy =0. 4...

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