NAS111 - Aeroelasticity using MSC Nastran

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This seminar is intended for engineers concerned with structural loads, flying qualities, and aeroelastic stability of flexible aircraft and missiles. The objective of the seminar is to familiarize the engineer with state-of-the-art MSC Nastran applications in aeroelastic analyses. An overview of the aeroelastic capability is followed by an in-depth discussion of the available aerodynamic theories and the three available aeroelastic solutions: static aeroelasticity, flutter, and dynamic aeroelasticity. Advanced topics include modeling aerodynamic bodies, active control systems, the specification of dynamic loads, sensitivity analysis, and aeroelastic optimization.

3 days
Pre-requisites : 
NAS101A (Linear Static and Normal Modes Analysis using MSC Nastran), NAS101B (Advanced Linear Analysis using MSC Nastran), and NAS102A (Dynamic Analysis using MSC Nastran)

Day One

  • Overview of MSC Nastran aeroelastic capabilities
    • Historical development
    • Solution sequences
    • Set definitions
    • Matrix notation
    • Coordinate systems
  • Aerodynamic theories
    • Subsonic doublet-lattice method (DLM)
    • DLM with body interference
    • ZONA51
    • Strip theory
    • Mach box method
    • Piston theory
  • Surface and linear splines
  • Static aeroelastic analysis
    • Theoretical background
    • Trim
    • Stability derivatives
    • Element loads and stresses
    • Divergence analysis
    • Preparation of input/sample problems
    • Stiffness and mass data
    • Aerodynamic data
    • Extra points for control surfaces
    • Spline data
    • Direct matrix input
    • Solution control

Day Two

  • Flutter analysis
    • Methods of flutter analysis
    • Structural damping
    • Estimation of dynamic stability derivatives
    • Inclusion of flight control systems
    • Transfer functions
  • Preparation of input/sample problems
    • Calculation of modes
    • Complex eigenvalues
    • Aeroelastic divergence
    • Solution control
  • Guidelines for flutter analysis
    • Selection of flutter method
    • Convergence of modal solution
    • Aerodynamic modeling

Day Three

  • Dynamic aeroelasticity
  • Preparation of input/sample problems
    • Dynamic loads data
    • Transient response calculation
    • Gust response calculation
  • Guidelines for effective response analysis
    • Periodic loading
    • Frequency distribution
    • Spectral inputs
  • Aeroelastic design sensitivities and optimization
  • Miscellaneous topics