1. 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, September, 2001
Paper No
*Copyright ã 2001 Lockheed Martin Corporation. All rights reserved. Published by MSC.Software Corporation with permission.

2. External Loads Analysis is a Multidisciplinary Activity
All Roads Lead To Loads
1000’s of Maneuver Trim Simulations
100’s of “Design-To” Load Cases
Pitching Moment
Rolling Moment
Aerodynamic Data
Mass Distribution
Structural Flexibility
Flight Control System
Maneuver Description
External
Loads
Analysis
External Loads Analysis is a Multidisciplinary Activity

3. External Loads Come From Many Sources
Simulation
Wind
Tunnel
Testing
Inertia
Loads
Fuel
Thrust
Drag
Air
Store
Bending Moment
Buttock Line
Flight Test
Predicted
Analysis
Correlation
Flight
Testing

4. External Loads Analysis Models Evolve
Aerodynamic Models
Flat Panel Linear Theory
CFD
3-D Linear Theory
Conceptual
Design
Detail
Design
Structural Models
Stick Fuselage FEM
Built-Up Fuselage FEM

5. LM Aero External Loads Development Process
Database of Elastically Corrected Loads
Linear or Nonlinear Aerodynamic Data
General Mass Distribution Definition
Versatile Flight Control Specification
Robust Quasi-Static Trim Analyses
Integrated Component Loads Generation
NONLINEAR
AEROELASTIC
PRESSURE
DATABASE
Nonlinear Rigid
Pressure Data
2-D Loads
Integration Model
Pressure
Mapping
Linear Flexible
Increment
Aeroelastic
Analysis
LM Aero Loads Methods Adapt to Analysis Model Fidelity

6. MSC.FlightLoads Enhances Aeroelastic Analysis
CAD
MSC.Nastran
MSC.Patran
CAD Access
Structural Model
Aerodynamic Model
Results Visualization
Structural Analysis
Aeroelasticity
Design Optimization
MSC.FlightLoads
Key Features
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

7. Integrate External Loads Analysis Core Strengths
LM Aero Loads Analysis Tools
Nonlinear Aeroelastic Database
Component Integrated Loads
Efficient Trim Data Input
Robust Quasi-Static Trim
Compatible Loads Data Output
Integrated With Existing Pre- and Post Processing Tools
MSC.FlightLoads V1
Aeroelastic Model Development
Aeroelastic Data Generation
Aeroelastic Data Visualization
MSC.FlightLoads V2001
Nonlinear Aeroelastic Database
Component Integrated Loads
Aero Pressure Visualization
Improved Integration Through Partnership

8. 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)
Client Programs Invoke MSC.Nastran Functionality
Invoke Any MSC.Nastran Module Using Standard DMAP and/or MSC.Nastran Solution Sequence
User Written
Client Program
A P I
MSC-Supplied
Client object lib.
MSC.Nastran
Executable
DATABASE
DMAP Library
Client
Server
Seamless Transfer of Information Between Client and Server

9. Integration of MSC.FlightLoads at LM Aero
3D to 2D
Mapping
Map3D_2ADB
Rigid Aero
Correction
Correct_ADB
Balanced
Maneuver
Loads
Analysis
Component
Critical
Survey
Existing
Process
Trim Cases
NLDS
MSC.FlightLoads
MSC.Patran
MSC.Nastran
FORCE
Cards
Toolkit API
ADB
AEDB
Rigid Aero
Database
Aeroelastic
API
FORCE
Cards
MSC Tools
LM Aero Tools

10. 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 Data Stored In Existing Data Structures
ADB / AEDB May Contain Nonlinear Aeroelastic Data
MSC.Nastran Interpolator Provides Aeroelastic Data at Arbitrary Controller Settings
MSC.Nastran Data Feeds NLDS Iterative Quasi-Static Trim and Component Loads Algorithms
MSC.Nastran
ADB
Aero Model Geometry
Coordinate Systems
Reference Dimensions
Control Surface Definition
AEDB
Control Vector States
Rigid Loads
Flexible Load Increments
MSC.Nastran Toolkit
MSC.FlightLoads Toolkit
NLDS

11. 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
DMAP
Original Data
SCALE,
DELTA
Corrected Data
ADB
MSC.Nastran
AEDB

12. 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

13. Concluding Remarks Summary Acknowledgements
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