Safe Separation Analysis of the Internal GBU-32 JDAM from JSF

Size: px

Start display at page:

Download "Safe Separation Analysis of the Internal GBU-32 JDAM from JSF"

Ophelia Charles
6 years ago
Views:

1 Safe Separation Analysis of the Internal GBU-32 JDAM from JSF MSC.Software VPD Conference July 17-19, 2006 Chris Hetreed, Monique Purdon, Mary Hudson Fort Worth, TX 1

2 2

JCS Threshold Weapon Requirements GBU-38 JDAM 500-lb (MK-82 Warhead) AMRAAM C InternalGD-425 (CTOL) CBU-103 / 104 / 105 WCMD GBU-32 JDAM 1,000-lb (MK-83/BLU-110 Warhead) GBU-31 JDAM 2,000-lb (BLU-109

AGM-154 A/C JSOW Glide Bomb JDAM PGK (BLU-109 & MK-82) Phase I SDB GBU-31 JDAM 2,000-lb (MK-84 / BLU-109 Warhead) MK-84 BSU-50 Ballute 2,000-lb HDGP CBU-99/100 Rockeye II Cluster Munition AIM-132

3 JCS Threshold Weapon Requirements GBU-38 JDAM 500-lb (MK-82 Warhead) AMRAAM C InternalGD-425 (CTOL) CBU-103 / 104 / 105 WCMD GBU-32 JDAM 1,000-lb (MK-83/BLU-110 Warhead) GBU-31 JDAM 2,000-lb (BLU-109 Warhead) GBU-31 JDAM 2,000-lb (MK-84 Warhead) GBU-12 Paveway II 500-lb LGB (MK-82 Warhead) UK 500# PGB MK-82 BLU lb LDGP MK-82 BLU-111 BSU-49 Ballute 500-lb HDGP CBU- 87 / 89 Cluster Munition AGM-154 A/C JSOW Glide Bomb JDAM PGK (BLU-109 & MK-82) Phase I SDB GBU-31 JDAM 2,000-lb (MK-84 / BLU-109 Warhead) MK-84 BSU-50 Ballute 2,000-lb HDGP CBU-99/100 Rockeye II Cluster Munition AIM-132 ASRAAM Brimstone Internal Weapons External Weapons* AGM-65 Maverick (If 1760 compliant) AIM-9X Sidewinder AIM-132 ASRAAM MK-76 BDU-48 / MK-58 Missionized Gun Pod {CV / STOVL} Brimstone / Joint Common Missile BDU-57/59/60 Laser-Guided Training Round AIM-120B UK 500# PGB AIM-120 C GBU-12 Paveway II 500-lb LGB (MK-82 Warhead) GBU-10 Paveway II 2,000-lb LGB (MK-84 Warhead) GBU-16 Paveway II 1,000-lb LGB (MK-83 Warhead) MK-83 BLU-110 LDGP 1,000-lb LDGP MK-83 BSU-85 HDGP AGM-158 JASSM AGM-88 HARM (If 1760 compliant) GBU-24/B Paveway III 2,000-lb LGB (MK-84 / BLU-109 Warhead) MK-84 2,000-lb LD/HDGP Store Fully Certified During EMD 426-Gallon Wing Tank Stormshadow DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited * Including All Internal Weapons Lockheed Martin MXU-648/CNU-88 Aeronautics Baggage Company Pod 3

Weapons Stations Station 11 10 9 8 7 6 5 4 3 2 1 Store A/A A/A, A/S

Weight STOVL Weight 300 2,500 5,000 2,500 350 1,000 Over 18,000 Lbs

2,500 300 300 1,500 5,000 1,500 350 1,000 350 1,500 5,000 1,500 300

4 Weapons Stations Station Store A/A A/A, A/S A/A, A/S A/A, A/S A/A A/S A/A A/A, A/S A/A, A/S A/A, A/S A/A CTOL/CV Weight STOVL Weight 300 2,500 5,000 2, ,000 Over 18,000 Lbs Ordnance Capacity Nonpyrotechnic Suspension and Release 350 2,500 5,000 2, ,500 5,000 1, , ,500 5,000 1, DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited 4

5 F-35 JSF Store Separation Analysis Objective: Demonstration of the process used by the F-35 JSF Store Separation team to analyze the pre-flight safe separation of the GBU-32 JDAM. Topics: Store Separation 3 Step Process Flowfield Studies: New Grid Collection Methods In-Bay Aerodynamic Loads Modeling Innovative Techniques for Database Building, Validation, and Flight Clearance Envelope Generation Applying MSC.Adams & VI-AirCraft to Store Separation Applications 5

6 JSF Store Separation 3-Step Process Step 1: Validation Grid Data N GEMD Database 6DOF (ADAMS) =CTS Traj? Y GEMD+ 6DOF OK Step 2: Flight Envelope N Grid Data =CTS Aero? Y 6DOF (M,Alt) Miss Distance Flight Clearance Envelope Step 3: Parameter Uncertainty Monte Carlo 6DOF Miss Distance Probability of Clearance 6

7 Standard Grid: Extensive grid used for flowfield analysis Flowfield Grid Studies Tilt and Slant Sweeps Z Sweep to 25ft or WT limits Combined pitch and yaw displacements Snowman Grid: New Grid design for improved accuracy and test efficiency Large Snowman ~170 Points (ZC and YC, combined pitch and yaw) Central Snowman ~18 Points (ZC, combined pitch and yaw) 7

(in) ZC (in) 10 feet CTS Central Snowman Large

Trajectories near the AC Roll (deg) Yaw (deg) ZC

8 Flowfield Grid Studies Sta.8 1KJDAM, Transonic Low Altitude Case DX (in) DY (in) ZC (in) 10 feet CTS Central Snowman Large Snowman Standard Grid Pitch (deg) CTS Trajectory Central Snowman Large Snowman Standard Grid Majority of cases have Minimal Effects on Trajectories near the AC Roll (deg) Yaw (deg) ZC (in) 10 feet 10 feet Snowman grids transition to a nominal z-sweep between 5-6 ft 8

In-Bay Aerodynamic Loads Modeling Vacuum In-bay aero set to zero from carriage to park Interp to Zero In-bay aero interpolated from park loads to zero at carriage (similar to CTS) Interp to Carriage

9 In-Bay Aerodynamic Loads Modeling Vacuum In-bay aero set to zero from carriage to park Interp to Zero In-bay aero interpolated from park loads to zero at carriage (similar to CTS) Interp to Carriage In-bay aero interpolated from park loads to carriage loads Data taken at various vertical positions and pitch displacements ΔZ Position ΔΘ Position STOVL St.8:GBU-32 / St.7:AIM-120C In-Bay Loads In-bay aero obtained from an attached loads database 9

10 In-Bay Aerodynamic Loads Modeling Sta.8 1KJDAM, Transonic Low Altitude Case DX (in) DY (in) ZC (in) 10 feet Interp to Zero Attached Loads Vacuum Roll (deg) Interp to Carriage Pitch (deg) Attached Loads Interp to Carriage Interp to Zero Vacuum Yaw (deg) ZC (in) 10 feet 10 feet 10

11 In-Bay Aerodynamic Loads Modeling ZC Vacuum Interp to Carriage Minimal Effects on Trajectories, Miss Distance Plots, and Clearance Envelopes Interp to Zero Attached Loads Vacuum Model Interp to Carriage Miss Distance Recommendations Use attached loads data, if available Interpolate from park loads to zero Leverage modeling/simulation to reduce cost No additional attached loads WT testing planned Interp to Zero Attached Loads 11

Y GEMD+ 6DOF OK Step 2: Flight Envelope N Grid Data =CTS Aero?

12 JSF Store Separation 3-Step Process Step 1: Validation Grid Data N GEMD Database 6DOF (ADAMS) =CTS Traj? Y GEMD+ 6DOF OK Step 2: Flight Envelope N Grid Data =CTS Aero? Y 6DOF (M,Alt) Miss Distance Flight Clearance Envelope Step 3: Parameter Uncertainty Monte Carlo 6DOF Miss Distance Probability of Clearance 12

13 Flight Clearance Envelope ASEP High Fidelity Tool ADAMS (Automatic Dynamic Analysis of Mechanical Systems) ASEP (ADAMS Store Separation - customized VI-AirCraft) Flight Envelope Simulations 13

14 ASEP Subsystem-based Approach Subsystems Assemblies Simulations Wheel(s) Wheel component Wheel/Tire LGR Brakes Hydraulics Control Laws Engine Airframe LGR Structure (w/o wheels) LGR Dynamics (w/ wheels) Full Aircraft subsystem subsystem full vehicle Steady Axle Load Drop Retract-Extend Dyn. Tipback Taxi & Shimmy Braking Landing Catapult In-flight Stores Full Aircraft Stores full vehicle stores StoreMotion Basic In-flight Full maneuver Simulation Basic In-flight Full maneuver Pit ejection 14

15 ASEP Workflow Components parts & joints oleo actuators aero user-forces etc. Templates Subsystems Assemblies Tests (Simulations) Post- Processing Standard User Existing Existing or New Existing or New Existing Existing or New Template Builder Existing New Customizer New Types New Types New Types New Types New Types New Types 15

Releasable lugs Swaybrace pads Piston/Housing bearings

16 ASEP Templates Flexible Parts: (from NASTRAN / ANSYS) Pistons Swaybraces Flexible Connections: Airframe attachments Releasable lugs Swaybrace pads Piston/Housing bearings Friction: Piston/Housing bearings Swaybrace pads Freeplay: Piston/Housing bearings 16

ASEP Workflow Components parts & joints oleo actuators

New Existing or New Existing Existing or New Template

17 ASEP Workflow Components parts & joints oleo actuators aero user-forces etc. Templates Subsystems Assemblies Tests (Simulations) Post- Processing Standard User Existing Existing or New Existing or New Existing Existing or New Template Builder Existing New Customizer New Types New Types New Types New Types New Types New Types 17

18 Library of Subsystems 18

19 Create Assemblies from Subsystems Library of Subsystems Stores Subsystem Stores Subsystem Airframe Subsystem Select subsystems during assembly creation process Landing Gear Other Subsystems Full-aircraft Maneuver Test rig Airframe Ejector Dual Rack Store Assembly Only Full-aircraft Assembly Bomb Left Ejector Pylon 19

20 Assembly & Automated Simulation Comprised of rigid and/or flexible subsystems Ready for automated landing gear and/or store-related simulations 20

21 PostProcessing Simulation Results 21

22 JDAM Flight Envelope Simulations Miss distances are automatically computed in ASEP s post-processor Need to perform 100+ simulations for each flight envelope Repeat the envelope for: Various G s Various +/- Roll rates Flex/Freeplay, when necessary Various adjacent stores 22

23 STOVL (2) GBU-32 MK-83 JDAM (I) + (2) AIM-120C (I) Basis for Assessment CTS: WS-15 data Freestream: Boeing large (~1/3) scale In-Bay Loads: WS-15 Attached Loads Flowfield: WS-15 CFD: na 6DOF: ADAMS (Rigid, no freeplay) 23

24 STOVL GBU-32 Envelope 0.5g, All Rigid, No Freeplay, 0 /sec Roll Rate Trajectory DX (in) DY (in) Time ZC (in) Flight Clearance Envelope Roll (deg) Pitch (deg) Yaw (deg) Miss ZC (in) Miss Distance 24

25 STOVL GBU-32 Envelope 0.5g, All Rigid, No Freeplay, 25 /sec Roll Rate Trajectory DX (in) DY (in) Time ZC (in) Flight Clearance Envelope Roll (deg) Pitch (deg) Yaw (deg) Miss (Nominal) ZC (in) Miss Distance 25

26 Sample Ejector Mech. Differences Moving vs. Non-moving swaybraces Same ejector piston force, aero database, store, maneuver 26

27 Sample Flexible Simulations Launcher Rail, Aircraft Wing, BRU Attachments, etc. 27

28 JSF Affordability is Key Fewer store sep flight test points Increased number of aircraft/stores to certify Therefore, Increased emphasis on: Modeling & simulation Validation Efficiency Pre-flight analysis is critical! 28

29 What s New & Different? Flowfield Grid Studies - Uses for the Central Snowman Exploratory studies to capture separation characteristics Candidate as a CFD grid In-Bay Aerodynamic Loads Modeling Minimal trajectory and miss distance effects Use aerodynamic model to reduce testing costs Innovative Database Building and 6DOF Tool Streamline process for building databases Techniques provide good basis for validating aerodynamic databases and 6DOF analysis ASEP 6DOF Tool Automation/speed, different user modes, higher fidelity Quick integration of aero and autopilot modules 29

30 QUESTIONS? 30

31 Backup 31

32 Database Validation Techniques Flowfield Grid Studies In-Bay Aerodynamic Loads Modeling Innovative Tools for Database Building and Validation GEMD (General Exchange of Methods and Data) Automated Database Building Scripts Wind-tunnel CTS* vs. Database Aerodynamics Wind-tunnel CTS* vs. Database Trajectories * CTS Captive Trajectory System 32

33 Flowfield Grid Studies Standard Grid: Extensive grid used for flowfield analysis Tilt and Slant Sweeps Z Sweep to 25ft or WT limits Combined pitch and yaw displacements Z-Sweep Taguchi Method: Assess grid interpolation Collection errors and define uncertainties in database Method Snowman Grid: New Grid design for improved accuracy and test efficiency Large Snowman ~170 Points (ZC and YC, combined pitch and yaw) Central Snowman ~18 Points (ZC, combined pitch and yaw) Discrete Points Collected like Pitch-Pause Method Taguchi: 18 Select Points 33

34 Flowfield Grid Studies Wind-tunnel test efficiencies ~ X time units - Standard Grid ~ X 2 time units - Large Snowman ~ X 2 time units - Central Snowman Central Snowman Pros/Cons + Reasonable comparisons with CTS Discrete data points vs. sweeps Less efficient for comparable amounts of data Relies on linear interpolation in key locations Use the Central Snowman grid for exploratory cases and CFD Prediction errors used in uncertainty analysis 34

Flowfield Grid Studies Standard Grid: Extensive grid used for Measured points used to: flowfield analysis Assess interpolation errors between grid collection methods Tilt and Slant Sweeps Taguchi

35 Flowfield Grid Studies Standard Grid: Extensive grid used for Measured points used to: flowfield analysis Assess interpolation errors between grid collection methods Tilt and Slant Sweeps Taguchi Method: Assess grid Z Sweep to 25ft or WT limits Incorporate into uncertainty analysis interpolation errors and define Combined pitch and yaw displacements (Step 3 in the Process) uncertainties in database Snowman Grid: New Grid design for improved accuracy and test efficiency Large Snowman ~170 Points (ZC and YC, combined pitch and yaw) Central Snowman ~18 Points (ZC, combined pitch and yaw) Consider 3-levels of each parameter, uniformly spaced 30 from Carriage ΔXp = -2, 0, 2 in ΔYp = -2, 0, 2 in ΔZp = 25, 30, 35 in ΔΨ = -3, 0, 3 deg ΔΘ = -5, 0, 5 deg ΔΦ = -10, 0, 10 deg 48 from Carriage ΔXp = -5, 0, 5 in ΔYp = -4, 0, 4 in ΔZp = 43, 48, 53 in ΔΨ = -5, 0, 5 deg ΔΘ = -10, 0, 10 deg ΔΦ = -20, 0, 20 deg Taguchi: 18 Select Points Full Factorial = 3 6 = 729 Cases Taguchi L18 Array to Select 18 Cases 35

36 Flowfield Grid Studies Sta.8 GBU-32 (1KJDAM) Error = Measured minus Predicted Data Large Snowman Standard Grid Snowman vs. Standard Grids produce similar error bands DCN Taguchi - Grid Data Central Snowman Some error reduction for Large Snowman Point Uncertainty Bands Step 3: Monte Carlo Uncertainty Analysis 36

37 Database Validation Techniques Flowfield Grid Studies In-Bay Aerodynamic Loads Modeling Innovative Tools for Database Building and Validation GEMD (General Exchange of Methods and Data) Automated Database Building Scripts Wind-tunnel CTS vs. Database Aerodynamics Wind-tunnel CTS vs. Database Trajectories 37

38 Database Validation Techniques Flowfield Grid Studies In-Bay Aerodynamic Loads Modeling Innovative Tools for Database Building and Validation GEMD (General Exchange of Methods and Data) Automated Database Building Scripts Wind-tunnel CTS vs. Database Aerodynamics Wind-tunnel CTS vs. Database Trajectories 38

Innovative Database Building Tools Templates of

Automated Scripts for Generating/Validating

Database in GEMD (General Exchange of Methods &

(ft) (ft) (ft) What effects do these differences

39 Innovative Database Building Tools Templates of Database Functions Database Scripting Tool (dbst) Automated Scripts for Generating/Validating Databases Wind-Tunnel Data Files Aerodynamic Database in GEMD (General Exchange of Methods & Data) Black Box Object GBU-32 CTS Trajectory Aero (ft) (ft) (ft) What effects do these differences have on trajectories? GBU-32 Aero Extracted from the Database (ft) (ft) (ft) 39

(in) DY (in) ZC (in) 10 feet CTS Run ADAMS

40 6DOF Analysis and Validation Sta.8 1KJDAM, Transonic Low Altitude Case DX (in) DY (in) ZC (in) 10 feet CTS Run ADAMS with CTS Aero ADAMS with Database Aero CTS Run ADAMS w/ CTS Aero ADAMS w/ Database Aero ZC (in) Roll (deg) No ejector modeling CTS motion to EOS Store 6DOF validation Database validation Pitch (deg) 10 feet 10 feet Yaw (deg) 40

Validation of an Unstructured Overset Mesh Method for CFD Analysis of Store Separation D. Snyder presented by R. Fitzsimmons

Validation of an Unstructured Overset Mesh Method for CFD Analysis of Store Separation D. Snyder presented by R. Fitzsimmons Stores Separation Introduction Flight Test Expensive, high-risk, sometimes catastrophic