Transcript Integration of MSC.FlightLoads and Dynamics at Lockheed

Integration of MSC.FlightLoads and Dynamics
at Lockheed Martin Aeronautics Company*
Dan Egle
Lockheed Martin Aeronautics Company, Fort Worth, Texas
John Ausman
MSC.Software Corporation, Santa Ana, California
MSC.Software 3rd Worldwide Aerospace Conference and
Technology Showcase, 24 - 26 September, 2001
Paper No. 2001-31
*Copyright  2001 Lockheed Martin Corporation. All rights reserved.
Published by MSC.Software Corporation with permission.
Lockheed Martin Aeronautics Company
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All Roads Lead To Loads
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1000’s of Maneuver
Trim Simulations
•
100’s of “Design-To”
Load Cases
Structural Flexibility
Mass Distribution
Flight Control System
Maneuver Description
External
Loads
Analysis
Rolling Moment
Aerodynamic Data
Pitching Moment
External Loads Analysis is a Multidisciplinary Activity
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External Loads Come From Many Sources
Simulation
Wind
Tunnel
Testing
Air
Loads
Thrust
Loads
Flight
Testing
Store
Loads Inertia
Loads
Analysis
Correlation
Flight Test
Predicted
Bending Moment
Drag
Loads
Fuel
Loads
Buttock Line
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External Loads Analysis Models Evolve
Aerodynamic Models
Flat Panel Linear Theory
Conceptual
Design
3-D Linear Theory
CFD
Detail
Design
Structural Models
Stick Fuselage FEM
Built-Up Fuselage FEM
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LM Aero External Loads Development Process
 Database of Elastically Corrected Loads
 Linear or Nonlinear Aerodynamic Data
 General Mass Distribution Definition
NONLINEAR
AEROELASTIC
PRESSURE
DATABASE
 Versatile Flight Control Specification
 Robust Quasi-Static Trim Analyses
 Integrated Component Loads Generation
Nonlinear Rigid
Pressure Data
Pressure
Mapping
Linear Flexible
Increment
2-D Loads
Integration Model
Aeroelastic
Analysis
LM Aero Loads Methods Adapt to Analysis Model Fidelity
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MSC.FlightLoads Enhances Aeroelastic Analysis
CAD
MSC.Patran
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CAD Access
Structural Model
Aerodynamic Model
Results Visualization
MSC.Nastran
 Structural Analysis
 Aeroelasticity
 Design Optimization
MSC.FlightLoads
Key Features
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•
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Pre- and Post-Processing Support From MSC.Patran
Subsonic and Supersonic Aerodynamic Panel Codes
External Nonlinear Pressure, Force, and AIC Data Support
Generic Control System and Iterative Trim Algorithms
Aeroelastic Analysis of Aircraft For Arbitrary Maneuvers
Aerodynamic and Aeroelastic Loads Database and Browser
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Integrate External Loads Analysis Core Strengths
LM Aero Loads Analysis Tools
MSC.FlightLoads V1
• Nonlinear Aeroelastic Database
• Aeroelastic Model Development
• Component Integrated Loads
• Aeroelastic Data Generation
• Efficient Trim Data Input
• Aeroelastic Data Visualization
• Robust Quasi-Static Trim
MSC.FlightLoads V2001
• Compatible Loads Data Output
• Nonlinear Aeroelastic Database
• Integrated With Existing Preand Post Processing Tools
• Component Integrated Loads
• Aero Pressure Visualization
Improved Integration Through Partnership
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MSC.Nastran Toolkit API Provides Direct Access
Key Features
• Programmatic Client-Server Interface to MSC.Nastran
• C, FORTRAN and Java Language Bindings
• Client Programs Access MSC.Nastran Database
(Query / Create / Read / Write Table and Matrix Data)
User Written
Client Program
MSC-Supplied
Client object lib.
API
Client
Seamless Transfer of Information
Between Client and Server
MSC.Nastran
Executable
MSC.Nastran
DMAP Library
DATABASE
• Invoke Any MSC.Nastran Module Using Standard
DMAP and/or MSC.Nastran Solution Sequence
API
• Client Programs Invoke MSC.Nastran Functionality
Server
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Integration of MSC.FlightLoads at LM Aero
MSC.FlightLoads
MSC.Patran
Map3D_2ADB
Correct_ADB
3D to 2D
Mapping
Rigid Aero
Correction
NLDS
Rigid Aero
Database
ADB
MSC.Nastran
MSC.Nastran
Toolkit API
FORCE
Cards
Maneuver
Trim Cases
Balanced
Maneuver
Loads
API Analysis
Existing
Loads
Process
Aeroelastic
Database
AEDB
MSC Tools
LM Aero Tools
Component
Loads
FORCE
Cards
Critical
Loads
Survey
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Balanced Maneuver Loads Analysis
NLDS Client Features
• Direct Access to MSC.Nastran
Database Via Toolkit APIs
• Read Access to Data Previously
Obtained Through Flat Files
MSC.Nastran
ADB
AEDB
• MSC.Nastran Data Stored In
Existing Data Structures
Aero Model Geometry
Control Vector States
• ADB / AEDB May Contain
Nonlinear Aeroelastic Data
Reference Dimensions
• MSC.Nastran Interpolator
Provides Aeroelastic Data at
Arbitrary Controller Settings
• MSC.Nastran Data Feeds NLDS
Iterative Quasi-Static Trim and
Component Loads Algorithms
Coordinate Systems
Control Surface
Definition
Rigid Loads
Flexible Load
Increments
MSC.Nastran Toolkit
MSC.FlightLoads Toolkit
NLDS
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Rigid Aerodynamic Data Correction
Correct_ADB Features
• Direct Access to MSC.Nastran
Database Via Toolkit APIs
• Allows Modification of Loads
Source Data to Conform With
Test or Higher-Order Data
• Aerodynamic Load Set Specified
by Control Parameter Settings
• Additive (Delta) or Multiplicative
(Scale) Corrections Allowed With
Optional Target Integrated
Component Load Matching
• Two Phase Process: Corrections
Calculated by Client and Applied
by Server (MSC.Nastran)
Correct_ADB
MSC.FlightLoads Toolkit
MSC.Nastran Toolkit
Original
Data
SCALE,
DELTA
DMAP
Corrected
Data
ADB
MSC.Nastran
Lockheed Martin Aeronautics Company
AEDB
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3D-to-2D Aerodynamic Pressure Mapping
Map3D_2ADB Features
• Map 3D Pressure Data to
2D Aeroelastic Model
• MSC.Patran Application
Written in PCL
• Fields Capability Used to
Perform 3D-2D Mapping
• 3D and 2D Models Divided
Into Regions for Mapping
• Delta Pressure Calculated
on 2D Model
• Transfer to MSC.Nastran
Database Via Bulk Data
Interface
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Concluding Remarks
Summary
 Improved Integration of MSC.FlightLoads and the
LM Aero External Loads Analysis Process
 MSC.Nastran Toolkit API Provided Direct Access to
MSC.Nastran Aerodynamic and Aeroelastic Databases
 LM Aero and MSC Worked Together To Combine
Core Strengths of MSC.FlightLoads and the
LM Aero External Loads Analysis Process and Tools
Acknowledgements
 Tad Chichester (LM Aero) – NLDS Vision
 Doug Neill (MSC) – MSC.FlightLoads and Dynamics
 Steve Wilder & Vinh Lam (MSC) – Correct_ADB
 Gerry Norvell (MSC) – Map3D_2ADB
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