Aerostructural Optimization with the Component Object Model Technology

1
Aerostructural Optimization with the Component
Object Model Technology

• Jaehun Lee, Jang Hyuk Kwon
• Korea Advanced Institute of Science and
  Technology
• Department of Aerospace Engineering
• Aerodynamic Simulation Design Integration Lab.
• 2006. 11. 20.

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Content

• Background
• Objective
• Component Object Model
• Aerostructural optimization
• Discussion Conclusion

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Background ModelCenter

• Phoenix Integration Corporation
• Process integration environment
• Easy to integrate programs running in different
  computers or different OS.
• Optimization tool
• Design of Experiment tool

4
Background ModelCenter

• Advantage
• Analysis server Java, OS independent
• Convenient to integrate programs running in
  various operating systems
• Disadvantage
• Programming environment Visual Basic Script,
  Java Script and etc.
• Limited optimizer
• DOT variable Metric, conjugate gradient,
  sequential linear programming, sequential
  quadratic programming
• Genetic algorithm

5
Objective

• To construct the Multidisciplinary Analysis in
  the FORTRAN environment with ModelCenter
• To use the COM technology
• To use object-oriented programming in the FORTRAN
  environment

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Component Object Model

• Microsofts middleware to support component-based
  distributed computing.
• OMG(Object Management Group) CORBA (Common
  Object Request Broker Architecture)
• Sun EJB (Enterprise JavaBeans)
• A binary standard that defines how objects are
  created and destroyed and how they interact with
  each other1)
• Different applications from different sources can
  communicate with each other across process
  boundaries.
• Language independent

1) MSDN online
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Component Object Model

• Object
• An object combines different data types and
  creates a new data type.
• Structure in C, derived type in FORTRAN90
• FORTRAN
• FORTRAN90 supports the object-oriented
  programming
• Module procedure a subroutine defined in a
  module
• Compaq Visual Fortran and Intel Visual Fortran
  provide subroutines to support COM such as
  AUTOALLOCATEINVOKEARGS, AUTOADDARG and
  AUTOINVOKE. ? complicate to use

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Component Object Model Matlab

• Actxserver to create a COM Automation server and
  return a COM object for the server's default
  interface
• Invoke to invoke a method on an object or
  interface
• Example to call ModelCenter in Matlab

To initialize COM client mcactxserver(ModelCent
er.Application) To load a modelcenter
file invoke(mc,loadModel,D\public_aserver\kflo
w.pxc) To assign a parameter for
KFLOW invoke(mc,setvalue,Model.kflow.Input.Solv
erCondition.FlowItermax,100) To run
KFLOW Clinvoke(mc,getValue,Model.kflow.Output.
SolverLog.Cl)
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Component Object Model FORTRAN

• To create ModelCenter interfaces with CVF/IVF
  Fortran Module Wizard

MODULE ModelCenter ! Module Procedures CONTAINS
FUNCTION IModelCenter_getValue(OBJECT,
varName, STATUS) . END FUNCTION
IModelCenter_getValue END MODULE
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Component Object Model FORTRAN

• COM Routine
• Cominitialize to initialize the COM library
• Comcreateobject to create a COM Automation
  server and return a COM object
• ModelCenter interface
• IModelCenter_loadModel to load a model
• IModelCenter_setValue to set a value in the
  model
• IModelCenter_getValue to get the value of a
  variable

INTEGER(4) status,status2,model_center CHARACTE
R(50)citer CALL COMINITIALIZE(status) CALL
COMCREATEOBJECT ('ModelCenter.Application',
model_center, status) CALL IModelCenter_loadModel(
model_center,cmodel_center) CALL
IModelCenter_setValue(model_center,'Model.KFLOW.In
put.SolverCondition.FlowIterMax',citer,status2) f
lowtimeIModelCenter_getValue(model_center,'Model.
KFLOW.Output.CLCDLog.FlowTime',status2)
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Aerostructural Optimization

• Flow Analysis
• KFLOW in-house code, parallelized multiblock
  structured solver
• Navier-Stokes equation, Bald-lowmax turbulence
  model
• ONERAM6
• OS Linux
• Structural Analysis
• NASTRAN MacNeal-Schwendler Corporation (MSC)
• Linear static analysis
• Skin, spar, rib
• OS Windows
• Fluid Structure Interaction Analysis
• Static aeroelastic analysis

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Aerostructural Optimization

• Optimization
• Design variables
• Aerodynamic sweepback, upper thickness ratio,
  lower thickness ratio(3EA)
• Structural thickness of structural members(12EA)
• Objective to find minimum structural weight
  (estimated by NASTRAN)
• Constraints
• Aerodynamic
• Structural
• Optimization Algorithm Sequential Quadratic
  Programming
• Language FORTRAN, Compaq Visual Fortran (CVF)

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Aerostructural Optimization KFLOW
(b) Running of KFLOW through ModelCenter
(a) Running of KFLOW in Linux
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Aerostructural Optimization

• Optimization Result

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Discussion Conclusion

• Demonstration of the use of COM in FORTRAN
• Based on the use of commercial programs (CVF,
  ModelCenter)
• Object-oriented programming via FORTRAN
• Application of COM in the aerostructural
  optimization
• Alternative approach for integrating programs in
  the multidisciplinary analysis